US3351289A - Apparatus for applying a protective refractory coating to the refractory linings of basic oxygen furnaces - Google Patents

Apparatus for applying a protective refractory coating to the refractory linings of basic oxygen furnaces Download PDF

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US3351289A
US3351289A US453688A US45368865A US3351289A US 3351289 A US3351289 A US 3351289A US 453688 A US453688 A US 453688A US 45368865 A US45368865 A US 45368865A US 3351289 A US3351289 A US 3351289A
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furnace
support
lining
shooting pipe
refractory
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US453688A
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Raymond J Demaison
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Quigley Co Inc
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Quigley Co Inc
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • C21C5/441—Equipment used for making or repairing linings
    • C21C5/443—Hot fettling; Flame gunning

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  • This invention is directed to a method for prolonging the life of the basic refractory linings of all types of basic oxygen furnaces by spraying a suitable refractory slurry to form protective coatings thereon.
  • the lingings are subjected to extreme conditions arising from the addition of scrap metal and hot metal as well as the blowing with oxygen to subject the linings to a rapid abrasion, erosion and spalling and result in a repeatable wear pattern in any one furnace when operated under the same conditions.
  • special brick are used on the side of the vessel to prevent abrasion of the lining on the adddition of scrap metal while in other instances special linings are installed in various zones or sectors of the vessel to assist in overcoming said wear patterns.
  • these special additions tend to slow down the wear pattern in the particular areas but under no circumstances are they able to keep the Wear pattern down completely, only slow it up.
  • the types of linings that are being used are tar-bonded shapes, tar-bonded and tempered shapes or red shapes impregnated with taror pitch to seal the pores thereof to prevent the moisture from being absorbed therein.
  • electrically fused cast shapes are used and make it even more ditlicult to repair the linings, as the cast shapes are very dense and hard and thus present a surface upon which it is hard to make the refractory materials in slurry form adhere thereto for patching and building up the eroded, abraded and spalled areas as Well as the even overall protective coatings.
  • the invention was therefore predicated on this background of problems encountered in the normal operations ICC of the BOFs and the necessity of increasing the life of the linings in order to bring down the refractory cost per ton of steel produced.
  • a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle is mounted on a long rigid support capable of withstanding the furnace heat and is arranged for slidable and rotatable movement thereon.
  • the support is mounted on a mobile frat-me which is movable ytowards and away from the furnace to effect endwise movement of said support into and out of the furnace.
  • the mobile frame is equipped with a shield for protecting the operator from the furnace heat in the operation of the apparatus and said shield contains a supporting roll upon which the shooting pipe support rests and fulcrums for movement thereon to allow for endwise movement of the support into and out of the furnace and in addition allow for both vertical and horizontal rocking movements which in cooperation with the movement of the shooting pipe assures the possibility of moving and locating the discharge nozzle in any selected position inside the furnace to spray any and all areas deemed necessary to prolong the life of said lining.
  • the prime idea is to keep the lining at a sufficient thickness by building up the wear pattern areas and the overall lining area to prevent failure of said lining before a desired number of heats has been obtained thereon.
  • Another object of this invention is to provide a cornpletely retractable shooting pipe arrangement which can be completely removed from said furnace for storage, cleaning or movement to the next furnace for use therein.
  • the shooting pipe may be water cooled if desired to allow the continuous spraying of the protective refractory coating material onto the furnace lining without necessitating the withdrawal of the unitfor cooling.
  • the long rigid support may also be water cooled.
  • a further object of the invention is to provide a protective means for the operator or operators in the form of a shield equipped with a suitable heat resisting and insulating lining and having a suitable plurality of inspection openings containing safety screens therein for observing and controlling the movement of the long rigid support for the shooting pipe.
  • the shield is equipped with suitable means in the form of rollers contained in the opening in the shield to allow the shooting pipe support to be slid 3 into and out of the furnace as well as to allow for vertical and horizontal rocking movements of said support to permit the discharge nozzle to be located in different selected vertical and horizontal positions within the furnace.
  • the instant invention is directed to an apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining.
  • the apparatus disclosed herein is complete in its ability to allow the application of suitable protective refractory coatings to rst build up the eroded, abraded and spalled areas then to replace the refractory material which has been removed by the normal furnace operation.
  • FIG. 1 is a side view of the long rigid support for the shooting pipe capable of withstanding the furnace heat and clearly shows the shooting pipe for the refractory coating material equipped with -a suitable discharge nozzle;
  • FIG. 2 is an enlarged cross-sectional view of the long rigid support for the shooting pipe shown in FIG. l taken along the line 2-2 in the direction of the arrows and clearly depicts the means for rotatably and slidably mounting the shooting pipe;
  • FIG. 3 is a side view of the long rigid support for the shooting pipe shown in FIG. l in place in a BOF and clearly shows the mobile frame in which it is mounted and by which it may be moved endwise into and out of the furnace when said furnace occupies a substantially horizontal position;
  • FIG. 4 is a side view of a liquid cooled long rigid support for the shooting pipe
  • FIG. 5 is an enlarged side view of the liquid cooled long rigid support shown in FIG. 4 to more clearly show the water inlet and outlet pipes and the flow pattern created within the support to assure even cooling of the unit;
  • FIG. 6 is a cross-sectional view of the liquid cooled long rigid support of FIG. 5 taken along the lines 6--6 in the direction of the arrows;
  • FIG. 7 is a 4cross-sectional view of the liquid cooled long rigid support of FIG. 5 taken along the lines 7-7 in the direction of the arrows;
  • FIG. 8 is a cross-sectional view of the liquid cooled long rigid support of FIG. 5 taken along the lines 8 8 in the direction of the arrows;
  • FIG. 9 is 'a side view of the liquid cooled long rigid support shown in FIG. 4 in place in a BOF and clearly shows the manner in which the shooting pipe is mounted in the mobile frame.
  • FIG. 1 there is shown hte long rigid support 10 for the shooting pipe 24, which support is capable of withstanding the furnace heat.
  • the shooting pipe is equipped with a suitable discharge nozzle 31 for the refractory coating material and is rotatably and slidably mounted on the support.
  • the support 10 has a counterweight 11 at its outboard end to balance the support on the rollers 12 (seeFIG. 3).
  • the counterweight 11 is made up of small weights and may be varied in value by the removal or addition of the weights so as to keep the support in balance for maneuverability at all times.
  • the support 10 is fabricated of four longitudinally arranged angles 13, 14, 15 and 16, as shown in this View.
  • the vertical bracing consists of bars 17, 18,/
  • the shooting pipe 24 is placed longitudinally along the top of the support 10 in the brackets 25, 26, 27, 28 and 29' which are arranged to freely allow the insertion and turning of the shooting pipe 24 ⁇ ⁇ in the holes 30 as well as to allow it to be moved back and forth in an endwise direction.
  • the shooting pipe support 10 is divided into a plurality of sections and the sections bolted together, as shown in FIG. l, but the brackets 25, 26, 27, 28 and 29 for the shooting pipe will remain the same and will be lined up to accept the pipe therein. In most all instances, it will be preferable to sectionalize the support 10 at the point 21 to allow the counterweighted rear section thereof to be handled separately as a small section. It may also be desirable to make the main portion of the support in two sections, one of which may be arranged to hinge upwardly, as shown at 22, and fold over the other half to avoid problems in storage. In order to do this the shooting pipe would be withdrawn.
  • the far side of the shooting pipe support looking at FIG. 2, will be similarly constructed and the complete unit will therefore form a long stattc beam.
  • the top and bottom of the support will be similarly formed with suitable stiifeners along its length.
  • the counterweighted end of the support beyond the roller 12 is sloped gradually downwardly to provide space above it to manipulate the shooting pipe 24. T he same is true of the long section of the support which is inserted into the furnace, but here the top is kept straight and the bottom slopes upwardly toward the end of the' support while the two vertical sides remain parallel.
  • the support may also be made of other shapes, such as triangular, hexagonal, etc., depending upon the circumstance and equipment available to handle it.
  • the support may be fabricated of ordinary steels where short spray periods will be used, but where longer spray periods are encountered it is desirable to use stainless steels entirely.
  • the shooting pipe 24 is inserted into the support 10 from the counterweighted end and once inserted the spray nozzle 31 may be screwed in place and thus be ready for spraying.
  • the spray nozzle 31 is arranged with an angularly disposed discharge portion 32 and its outboard end is closed by means of a cap 33, while the body of the nozzle is fastened to the shooting pipe 24 ⁇ by means of coupling 34 to make it possible, when desired, to reverse the nozzle on the end of the shooting pipe when it is necessary to spray the neck portion of the furnace.
  • the spray nozzle 31 may be made with the discharge portion 32 at various angles from 30 to 90 to thus cover the entire periphery of the furnace from top t0 bottom. If the shooting pipe support is Very long and greater rigidity is desired, it is possible to use angle for the vertical and horizontal cross braces. The smaller.'
  • the support 10 may be designed for liquid cooling by substituting tubing or pipe for the angles and inserting a pressure tank at the small end which is inserted into the furnace and by using two of the longitudinal pipes to supply cool liquid to the tank and two pipes to return the warm liquid for discharge or recooling, as desired.
  • the warm liquid pipes should be fitted with safety valves in case vapor is generated in the pipes due to cooling liquid flow failure.
  • the discharge nozzle 31 may also be used to measure the thickness of the lining in the furnace. A series of offsets from the centerline of the furnace may be worked out to determine from these offsets, using the length of the boom and the subtended angle of the boom from the centerline of the furnace, a particular offset which will, when using the inside face of the shell of the furnace as the reference point, give the remaining thickness of the lining.
  • the shooting pipe 24 may also be scribed or punchmarked to indicate the length protruding beyond the support 10 to form a control means for locating the spray nozzle longitudinally in the furnace when particular areas are to be sprayed. In addition the location of the discharge portion 32 can also be marked so that the operator can more closely control the spray pattern.
  • the support 10 for the shooting pipe 24, with the reversible spray nozzle 31 mounted thereon is of extreme importance because, without it, it would be diicult or impossible to spray the refractory material onto the lining, since the spray pipe alone gets hot and bends and would deect from the reaction force of the issuing spray and make it extremely hard to cover definite areas of the furnace lining.
  • FIGS. l and 2 disclose the long rigid support in its simplest form; more exotic forms will later be disclosed for use in larger furnaces, where longer supports are necessary and Where longer spraying periods are necessary.
  • the size of the furnace is of necessity the prime factor which will control its length, as it must be possible to reach the entire area of the furnace lining. After determining the length of the support, it will then be necessary to determine the shooting pipe size and its weight when filled with sprayable slurry as Well as the time necessary to build up the lining and subject the support to the heat of the furnace during that period.
  • FIG. 3 discloses, in connection with the furnace 38 which occupies a substantially horizontal position, the mobile frame 35 in which the long rigid support 10 is mounted.
  • This frame 35 is capable of movement on the oor 37 towards and from the furnace 38 to thus control the endwise movement of the long rigid support 10 in and out of the furnace 38.
  • the mobile frame 35 is equipped with the chain hoist 36 which is connected to the support 10 at its counterweight end 11 and is movable with the support during such movements.
  • the mobile frame 35 consists of an inverted U-shaped frame arrangement having an overhead I beam 41 supported on two inverted U-shaped supports 42 and 43 equipped with wheels 44 and 45 to allow the whole frame to be moved about on the oor 37.
  • the supports 42 and 43 are diagonally braced to the I beam 41 by means of angular braces 46 and 47 to stiffen the whole assembly and make it extremely rigid.
  • the carriage 48 is arranged to mn on the bottom ange of the I beam 41 having the two sets of wheels 49 and 50 (one side only shown, duplicate set on other side of beam to ride on flange of beam) upon which it will be moved to thus maneuver the support 10 within furnace 38.
  • the carriage 48 is arranged to support the chain hoist 36 to assist in effecting the maneuvering of the support 10 in the furnace and, as stated above, the chain hoist is secured to the counterweighted end 11 of the support 10 through an extension 10a via chain 51, whereby the support 10 can be vertically or horizontally rocked on the rollers 12 as well as slid into or out of the furnace on the I beam 41 and the rollers 12.
  • the support 42 is used to carry the shield 39 containing the opening 40 through which the long rigid support 10 may be moved back and forth on rollers 12 or swung sideways in the furnace.
  • the shield 39 is fastened to the support 42 by eans of brackets 55 and 56 and is completely fabricated of steel plate and angles and is lined with insulating refractory material to protect the operator from the furnace heat. Where extremely long periods of shooting are used, the shield 39 may be fitted with suitable additional windows containing tinted shatter and heat proof glass or steel screening for operator protection and comfort.
  • the lower end of the shield is equipped with additional wheels 44a where very heavy long rigid supports 10 are used in order to insure that the back wheels 45 will stay on the floor 37 without adding weights to the support member 43.
  • the shooting pipe 24 is arranged at its outboard end with a suitable rotary joint 52 interposed between said pipe and conduit 53 to allow the shooting pipe to be rotated and moved back and forth on the support.
  • the conduit 53 is connected to a suitable mixer arranged to supply refractory material thereto in proper form for spraying.
  • the shooting pipe 24 may also be arranged at the outboard end to mix the refractory material in said shooting pipe by adding a mixing chamber for the material and water and to form the sprayable slurry therein.
  • the extension 10b is controlled and contained by a circular ring of suitable diameter to allow the support 10 to be maneuvered in the furnace to spray the lining in a circular pattern and thereby furnish an additional means to control the spray pattern within the furnace.
  • the circular ring 100 is suspended from the beam 41 by means of the clamp 101 and the depending support 102 to thereby form a rigid guide means for controlling the spray pattern within the furnace 38.
  • FIG. 4 is a side view of a liquid cooled long rigid support 55 in the form of a tubular liquid cooled version with the shooting pipe 24 mounted internally therein for complete rotation as well as for lateral movement, whereby it is possible to spray complete sections of the furnace lining as Well as to allow abraded, eroded and spalled Iareas to be built up with extreme accuracy and control.
  • the support 55 is completely fabricated from tubing and annular rings of suitable sizes and poses no problem in assembling.
  • the center tube 56 is tted with four annular rings 57, 58, 59 and 60 welded in place on the center tube 56 as shown; annular ring 57 has no openings therein and is arranged to receive the tube 61 on its outside circumference to form the end closure for the tubular liquid coolant passage; annular ring 58 is also welded in place on the center tube 56 and outer tube 61 as shown to form the liquid coolant reservoir at the inboard end of the support wherein the flow of liquid coolant is reversed; and ring 58 is formed with a suitable plurality of holes arranged to receive the ends of the tubes used to supply the liquid coolant to the unit and in addition has holes for the coolant to flow therethrough and return through the outer tube.
  • the annular ring 59 is formed with the same plurality of holes as the ring 58 and is welded on its inside face to the tube 56 and on its outer face to the tube 61, and the liquid coolant supply tubes are welded into the holes contained in the rings 58 and 59 to thus form the means for supplying the inboard end reservoir with the liquid coolant.
  • the annular ring 60 with the liquid coolant inlet 62 on its outside face, is then welded in place on and in the tubes 56 and 61 to form the liquid coolant entrance reservoir and supply the liquid coolant to the tubes, carrying it to the inboard reversing flow reservoir contained between the annular rings 57 and 58.
  • the use of the tubes here is more or less of a necessity, as the liquid coolant in the whole length of the tubes contained between tubes 56 and 61 must be cooled, and the liquid coolant entering the passages in the tubes is at the lowest temperature and will therefore continuously cool the liquid coolant beyond the normal ow pattern.
  • the return fiow tube 63 is then installed, using the two annular rings 64 and 65 and welding the whole assembly into place to form the return liquid coolant passage with the pipe 66 contained on the outside face of the ring 65, carrying all the hot liquid coolant out for cooling and returning into inlet pipe 62.
  • the tube 61 is formed with a suitable number of radial holes in its periphery beyond the annular ring 64 to allow the coolant to ow outwardly into the passage between the two tubes 61 and 63 and thus allow the hot liquid coolant to be ejected outwardly into the rearwardly directed passage for discharge therefrom.
  • the design of the long rigid support 55 is such as to insure maximum coolness of the inboard end and also to allow the unit to be balanced on its outboard extending portion to facilitate its maneuvering in the furnace.
  • the annular ring 58 is welded in place between the two tubular members 56 and 61 concentrically mounted and arranged to accept the four tubes 70, 71, 72 and 73 mounted and welded thereto to carry the liquid coolant therein to the inboard reversing reservoir.
  • the annular ring 58 is also formed with four additional holes having the same cross-sectional area as that of the liquid supply tubes and equally spaced between the tube inlets to allow the liquid coolant to flow therethrough and keep a constantly replaced reservoir of the liquid coolant in the inboard reservoir, which is subjected to the greatest heat, and circulate back through the support cooling it enroute still further and nally allow it to ilow outwardly through the radially drilled holes in tube 61 into the space between the concentric tubes 61 and 63 and then empty out in pipe 66.
  • the design of the support is such as to preclude the formation of hot spots and high temperature differentials of said liquid coolants flowing therein, thereby insuring even temperature gradients to be set up over the entire length of said support to insure continued even cooling with no failures.
  • FIG. 7 is a cross-sectional view of the liquid cooled long rigid support 55 taken along the lines 7 7 of FIG, 5, and shows the radial holes in the tube 6]. so placed as to allow the liquid coolant flowing back from the inboard reversing reservoir to be discharged radially into the space between the two tubes 61 and 63 and then discharged into water outlet 66.
  • the complete theory of the operation of the coolant system is to allow the cold water to enter the tubes and be conveyed to the inboard reversing reservoir but in so doing the water is warmed rst by the water situated beyond the radial holes or beyond the normal flow pattern (to help keep this cool), then is further warmed by the return flow of hot water returning from the reversing reservoir and then to be discharged into the reversing reservoir for further warming and ow outwardly to the outlet pipe. In this manner, the water is warmed up in steps and not ejected as cold water into the reversing reservoir.
  • the annular ring 59 is welded in place between the two tubular members 56 and 61 concentrically mounted and arranged to accept the four tubes 70, 71, 72 and 73 mounted and welded thereto to carry the liquid coolant therein to the inboard reversing reservoir contained between the annular rings 57 and 58 and in addition to cool the liquid coolant contained in the reservoir beyond the holes in the tube 61.
  • the arrangement shown discloses the dual role of the tubes 70, 71, 72
  • the liquid cool- ⁇ ant outlet pipe 66 should be fitted with a pressure relief valve set to relieve the pressure in the system at from 50# to 75# above the pressure used in the liquid coolant system. This precaution is desirable because it is conceivable that something could happen to the liquid coolant supply system and with the high temperatures developed and existing in the furnace, it would not be long before the liquid coolant would be vaporizing and creating high pressures therein which could cause failures in the support if not promptly relieved.
  • the support and control means 75 used to control the movement of the support 55 consists again of a mobile frame in the shape of an inverted U-frame arrangement having an overhead I beam 76 supported on two inverted U-shaped supports 77 and 78 equipped with wheels 79 and 80 to allow the whole frame to be moved about on the oor 37.
  • the supports 77 and 78 are diagonally braced to the top of the I beam by means of braces 81 and 82, and it will be noted that the I beam 76 is suspended under the U-shaped supports 77 and 78 and that the braces 81 and 82 also go to the top of the I beam to thus leave the bottom flange clear for the entire length between supports.
  • the I beam 76 is arranged to accept the carriage 83 having two sets of wheels 84 and 85 (one side only shown, duplicate set on other side to ride on flange of beam) upon which it will be moved to thus maneuver the support 55 within the furnace 38.
  • the carriage 83 is arranged to support the chain hoist 86, which is secured to the support 55.
  • the support 55 is arranged with a circular ring 87 and the lifting chain of the chain hoist 86 is placed in the deep groove of the ring 87 to form the lifting means.
  • the circular ring S7 is made in halves which are secured together by means of bolts and wing nut to render said ring readily movable along the length of the outboard section of the support 55.
  • the extreme outboard end of the support 55 is equipped with a counterweight 88 secured by means of a chain 89 in the ring 90, which latter is also a split ring and may be moved. It is evident therefore that the two means'of controlling the maneuverability of the support 55 are the chain hoist and its positioning thereon and the counterweight with its positioning and weight control, providing an infinitely varying control means.
  • the support 55 is equipped with the water inlet pipe 62 and water outlet pipe 66 to which hoses 91 and 92 are connected to allow liquid coolant to be circulated therethrough and keep said support cool for longer periods of time and therefore allow longer spray periods to be used than would be possible without cooling.
  • the liquids used for cooling can be water, Prestone or any other liquid which will carry off heat and not cause any contamination problems. If a constant source of coolant liquid is not available, a cooling tower can be resorted to or a heat exchanger put in the circuit to cool the liquid.
  • the shooting pipe 24 contained in the support 55 is supplied with refractory coating material of suitable viscosity by means of conduit 53 with the rotary joint 52 interposed between said pipe and conduit to allow the shooting pipe to be rotated completely or partially as the spray pattern demands.
  • the outboard end of the shooting pipe may be equipped with suitable indicating means to show the angle of discharge of the nozzle as well as the positioning in the furnace.
  • the shooting pipe may also be equipped with suitable apparatus to continually turn it at any given rate desired in order, when an overall spray coating is desired, to move the shooting pipe longitudinally at a constant rate and accomplish this feat without any problem.
  • a further variation of the instant disclosure is to make two concentric tubes separate and distinct one from the other and allow the inner liquid cooled tube to be moved inside the outer liquid cooled tube for further variations in design and construction which will provide greater latitude in operation than that already disclosed herein.
  • the mobile frame 75 of the second embodiment shown in FIG. 9 is also fitted in this instance with a shield 95 fastened on the support 77 and is formed with the opening 96 through which the support 55 may be moved into and out of the furnace as well as rocked both vertically and laterally to locate the discharge nozzle in different selected positions within the furnace.
  • the shield 95 is also lined with a suitable light weight refractory or other heat insulating lining capable of withstanding the heat of the furnace to protect the operators and still allow them to see what they are doing inside the furnace.
  • the mobile frame 75 of FIG. 9 may also be used with the shooting pipe support 10 shown in FIGS. l, 2 and 3 where it is desired to facilitate the movement of said support into and out of the furnace.
  • the support 10 will be mounted on a heavy prefabrica-ted yoke equipped with a roller arranged across the bottom of the yoke.
  • the yoke is then mounted on a hook of the chain .hoist 86 and said chain hoist will allow the balanced support to be moved up and down on the carriage 83 and the whole apparatus can be moved on the beam 76.
  • Such an arrangement allows for complete freedom of movement of the support without resorting to rollers on the shield 95, In this manner, the mounting of the support is completely divorced from the shield.
  • the shield 95 of FIG. 9 and the shield 39 of FIG. 3 may be made in the form of hinged sections which may be folded together for ease of movement of the mobile frame on the floor.
  • the instant designs or their equivalent for supports may be designed to telescope, one section within the other, and be mechanically, electrically or hydraulically actuated, and may even be water cooled where large furnaces are to be sprayed for long periods of time.
  • This type of equipment will also allow the shooting pipe to be inserted inside or nested on the outside, depending on the design of the support and the actuating means employed.
  • the supports disclosed herein and use either air or oil for actuating cylinders which will dispense with the chain hoists per se but will still necessitate means to move the supports into and out of the furnace.
  • the long rigid support, the shooting pipe equipped with a suitable discharge nozzle, the mobile frame and the equipment for handling the long rigid support therefore form a combination which allows the application of protective refractory coatings to the refractory 1ining of a basic oxygen furnace while it is at or near operating temperature.
  • the same apparatus can be used on occasions to apply protective refractory coatings before the furnace is put in operation to further protect the lining when the furnace is put on the line.
  • the refractory material used for the repair and coating of the furnace linings may be of any type so long as it is suitable and effective for the practice of the invention as herein described.
  • suitable refractory materials are listed below:
  • the coating composition consists of a mixture of chrome ore and magnesia but wherein the chrome ore predominates;
  • An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining comprising in combination, a long rigid shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat and adapted to 4be moved endwise into and out of the furnace when the latter occupies a substantially horizontal position, the length of said support being substantially equal to the length of the furnace lining and a mobile frame carrying said support and located on a platform in proximity to the furnace, said support extending longitudinally of the mobile frame and when located out of the furnace projecting toward the furnace for a substantial distance from the furnace confronting end of the mobile frame, and said mobile frame being freely maneuverable on the platform to locate the shooting pipe support in position to enter the furnace at different angles and then movable toward and from the furnace in effecting the movements of the support into and out of the furnace.
  • An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the furnace, said frame being movable toward and from the furnace in effecting an endwise movement of the support with the shooting pipe thereon into and out of the furnace when the latter occupies a substantially horizontal position, and means for mounting the shooting pipe support on the mobile frame for a vertical rocking movement when said support is moved endwise into the furnace in order to locate the discharge nozzle in different vertical positions within the furnace, said mounting means including a supporting roller upon which the shooting pipe support rests and fulcrums.
  • An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the furnace, said frame being movable toward and from the furnace in effecting an endwise movement of the support with the shooting pipe thereon into and out of the furnace when the latter occupies a substantially horizontal position, and means for mounting the shooting pipe support on the mobile frame for a vertical rocking movement when said support is moved endwise into the furnace in order to locate the discharge nozzle in different vertical positions within the furnace, said shooting pipe support being provided at its end remote from the discharge nozzle with a weight to locate the balance point of the support near said end.
  • An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the furnace, said frame being movable toward and from the furnace in effecting an endwise movement of the support with the shooting pipe thereon into and out of the furnace when the latter occupies a substantially horizontal position, and means for mounting the shooting pipe support on the mobile frame for a vertical rocking movement when said support is moved endwise into the furnace in order to locate the discharge nozzle in different vertical positions within the furnace, said mounting means including an overhead trolley adapted to run on a track extending fore-and-aft of the mobile frame.
  • connection between the shooting pipe support and the overhead trolley includes a chain and pulley arrangement for raising and lowering the support with reference to the mobile frame.
  • connection between the shooting pipe support and the overhead trolley is such as to permit the support to be rocked laterally as well as vertically at its rocking point.
  • An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, and means whereby said support with the shooting pipe thereon may be moved endwise into and out of the furnace when the latter occupies a substantially horizontal position, said shooting pipe support being in the form of a cylindrical water jacket surrounding the shooting pipe but separate and distinct therefrom and comprising a series of concentrically disposed water circulating pipes extending substantially throughout the length of the jacket.
  • the Water jacket is formed at one end with a water space con nected to a water inlet and communicating with certain of the water circulating pipes at one end and wherein said jacket is formed at the opposite end with a similar water space connected with a water outlet as well as with the remaining water circulating pipes at the opposite end.
  • An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the support, said frame being maneuverable on the platform to locate the shooting pipe support in position to enter the furnace, and means for mounting the shooting pipe support in the mobile frame for endwise movement with reference to the frame when so positioned in order to move the support with the shooting pipe thereon into and out of the furnace while the frame remains stationary, said mounting means including an overhead trolley adapted to run on a track extending fore-and-aft of the mobile frame.
  • An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the li-fe of said lining comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the support, said frame being maneuverable on the platform to locate the shooting pipe support in position to enter the furnace, and means for mounting the shooting pipe support in the mobile frame for endwise movement with reference to the frame when so positioned in order to move the support with the shooting pipe thereon into and out of the furnace While the frame remains stationary, said mounting means including a roller upon which the shooting pipe support rests and moves and an overhead trolley adapted to run on a track extending tore-and-aft of the mobile frame.
  • An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat and adapted to be moved endWise into and out of the furnace when the latter occupies a substantially horizontal position, and a mobile frame carrying said support and located on a platform in proximity to the furnace, said support when located out of the furnace projecting toward the furnace for a substantial distance from the furnace side of the mobile frame, and said mobile frame being maneuverable on the platform to locate the shooting pipe support in position to enter the furnace and then movable toward and from the furnace in effecting the movements of the support into and out of the furnace, characterized in that the shooting pipe support is arranged in the mobile frame to be rocked to cause the discharge nozzle to describe a circle of given diameter within the furnace.

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Description

R. J. DEMAISON 3,351,289 APPARATUS FOR APPLYING A PROTECTIVE REFRACTORY Nov. 7, 1967 COATING TO THE REFRACTORY LININGS OF BASIC OXYGEN FURNACES 3 Sheets-Sheet l Filed May` 6, 1965 N0v 7, 1967 R. .1. DEMAISON .3 APPARATUS FOR APPLYING A PROTECTIVE REFRACTORY COATING TO THE REFRACTORY LININGS OF BASIC OXYGEN FURNACES 5 Sheets-Sheet `2 Filed May 6, 1965 I NVE NTOR fe 7- EMA/so/v TTOREEYS/ wmv F m um w m. @W ww www mw wm w@ uw mm NOV. 7, 1967 R. J. DEMAISON APPARATUS FOR APP LYING A PROTECTIVE REF'RACTOR COATING TO THE REFRACTORY LININGS OF BASIC OXYGEN FURNACES 3 Sheets-Sheet 3 Filed May 6, 1965 @NWN N mmv INVENTOR.`
United States Patent O APPARATUS FOR APPLYING A PROTECTIVE RE- FRACTRY COATING T THE REFRACTURY LININGS OF BASIC OXYGEN FURNACES Raymond J. Demaison, Bronx, N.Y., assignor to Quigley Company, Inc., a corporation of New York Filed May 6, 1965, Ser. No. 453,688 19 Claims. (Cl. Z39-132.3)
This invention is directed to a method for prolonging the life of the basic refractory linings of all types of basic oxygen furnaces by spraying a suitable refractory slurry to form protective coatings thereon.
The words basic oxygen furnaces are used to cover all of the concentric types of vessels, from the electric to the Kaldos Linz-Donowitz, DeMays, Grefs rotor, to the basic and acid converters, etc., and will be appreviated as BOF throughout the following description for the sake of brevity.
The major problem that has been encountered in the industry to date has been due to the rapid failure of the linings of the BOFs, giving rise to excessive lining costs per ton of steel produced.
The great rise in the last couple of years of the use of the BOFs in the United States has completely changed the normal thinking and methods of making steel. In addition the development of the vacuum process for degassing steels in the molten state as well as the continuous casting process for producing continuous billets have also resulted in major changes in the production of end products. It was therefore a normal evolution in the industry to try and produce steels at greater rates with shorter heat times and the BOFs were the answer. In the normal operation of the BOFs, the lingings are subjected to extreme conditions arising from the addition of scrap metal and hot metal as well as the blowing with oxygen to subject the linings to a rapid abrasion, erosion and spalling and result in a repeatable wear pattern in any one furnace when operated under the same conditions. In Some instances, special brick are used on the side of the vessel to prevent abrasion of the lining on the adddition of scrap metal while in other instances special linings are installed in various zones or sectors of the vessel to assist in overcoming said wear patterns. In some instances, these special additions tend to slow down the wear pattern in the particular areas but under no circumstances are they able to keep the Wear pattern down completely, only slow it up. In some extreme wear cases, six inches of additional refractory material is applied over the face of the entire new lining subjected to a definite wear pattern to protect it until it has been thoroughly burned in and set but here again when this is Worn off the lining receives the normal attack and the wear pattern takes over. The normal wear pattern on the lining runs as high as one-quarter of an inch for every 3 or 4 heats depending on the conditions existing in the furnace during normal operations. The life ot' a normal lining runs from anywhere from 175 to 300 heats and with extreme care being exercised in the operation of the furnace may run to 35() heats.
The types of linings that are being used are tar-bonded shapes, tar-bonded and tempered shapes or red shapes impregnated with taror pitch to seal the pores thereof to prevent the moisture from being absorbed therein. In some instances, electrically fused cast shapes are used and make it even more ditlicult to repair the linings, as the cast shapes are very dense and hard and thus present a surface upon which it is hard to make the refractory materials in slurry form adhere thereto for patching and building up the eroded, abraded and spalled areas as Well as the even overall protective coatings.
The invention was therefore predicated on this background of problems encountered in the normal operations ICC of the BOFs and the necessity of increasing the life of the linings in order to bring down the refractory cost per ton of steel produced.
It is an object of this invention to provide apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace in order to prolong the life of said lining. A shooting pipe for the refractory coating material equipped with a suitable discharge nozzle is mounted on a long rigid support capable of withstanding the furnace heat and is arranged for slidable and rotatable movement thereon. The support is mounted on a mobile frat-me which is movable ytowards and away from the furnace to effect endwise movement of said suport into and out of the furnace. The mobile frame is equipped with a shield for protecting the operator from the furnace heat in the operation of the apparatus and said shield contains a supporting roll upon which the shooting pipe support rests and fulcrums for movement thereon to allow for endwise movement of the support into and out of the furnace and in addition allow for both vertical and horizontal rocking movements which in cooperation with the movement of the shooting pipe assures the possibility of moving and locating the discharge nozzle in any selected position inside the furnace to spray any and all areas deemed necessary to prolong the life of said lining.
It is also an object of this invention to enable the operator to completely control the discharge nozzle in both the horizontal and vertical directions to enable him to first repair the abraded, eroded and spalled areas of the lining by the application of a suitable number of protective coatings, one over another, to bring the lining thickness in these areas up to the lining thickness of the surrounding areas and then apply over the whole lining area a suitable number of protective coatings, one 4over another, to further cover and protect the wear pattern areas and in addition protect the rest of the lining as well. The prime idea is to keep the lining at a sufficient thickness by building up the wear pattern areas and the overall lining area to prevent failure of said lining before a desired number of heats has been obtained thereon. -It is entirely conceivable that, if the lining is sutiiciently protected at the beginning of a campaign, the lining life may be extended to well over 800 heats. In the eld, by the use of the instant invention it has already been possible to obtain over 700 heats by simply maintaining the lining thickness at such a value as to prevent the failure thereof until a desired number of heats is obtained and thus more than double the normal life expectancy of the lining and reduce the refractory cost per ton of steel produced.
Another object of this invention is to provide a cornpletely retractable shooting pipe arrangement which can be completely removed from said furnace for storage, cleaning or movement to the next furnace for use therein. The shooting pipe may be water cooled if desired to allow the continuous spraying of the protective refractory coating material onto the furnace lining without necessitating the withdrawal of the unitfor cooling. In addition, where larger furnaces are to be sprayed over longer periods of time, the long rigid support may also be water cooled.
A further object of the invention is to provide a protective means for the operator or operators in the form of a shield equipped with a suitable heat resisting and insulating lining and having a suitable plurality of inspection openings containing safety screens therein for observing and controlling the movement of the long rigid support for the shooting pipe. In this manner it is possible to protect the operator from the high temperatures prevailing in the furnace and allow him to observe and control the spraying operation without too much discomfort. In addition, the shield is equipped with suitable means in the form of rollers contained in the opening in the shield to allow the shooting pipe support to be slid 3 into and out of the furnace as well as to allow for vertical and horizontal rocking movements of said support to permit the discharge nozzle to be located in different selected vertical and horizontal positions within the furnace.
The instant invention is directed to an apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining. The apparatus disclosed herein is complete in its ability to allow the application of suitable protective refractory coatings to rst build up the eroded, abraded and spalled areas then to replace the refractory material which has been removed by the normal furnace operation. The net result is easily and quickly explained in the ability of the refractory coating materials used to form the refractory coatings to be retained on the face of the lining and not react therewith in a deleterious manner but rather to react therewith to form compounds of higher refractoriness and in addition have the ability to react with the iron oxide in the slag and thus prevent it from reacting with the lining to produce compounds of lower refractoriness. The subsequent layers of the protective refractory coatings with the slag deposited in between said layers react to form a monolithic facing over the lining which protects said lining; and, if said coatings were being continually replaced as is envisaged in the present invention, they will result in a continuous lining thickness and cause the lining life to be extended still further. If a suitable plurality of the protective refractory coatings were continuously maintained at a more or less constant rate without interfering too much with production, it would be possible to have the bricks forming the lining stand up for much longer periods of time without deteriorating internally.
Other objects and advantages of the invention will readily become apparent by a thorough consideration of a preferred embodiment thereof:
FIG. 1 is a side view of the long rigid support for the shooting pipe capable of withstanding the furnace heat and clearly shows the shooting pipe for the refractory coating material equipped with -a suitable discharge nozzle;
FIG. 2 is an enlarged cross-sectional view of the long rigid support for the shooting pipe shown in FIG. l taken along the line 2-2 in the direction of the arrows and clearly depicts the means for rotatably and slidably mounting the shooting pipe;
FIG. 3 is a side view of the long rigid support for the shooting pipe shown in FIG. l in place in a BOF and clearly shows the mobile frame in which it is mounted and by which it may be moved endwise into and out of the furnace when said furnace occupies a substantially horizontal position;
FIG. 4 is a side view of a liquid cooled long rigid support for the shooting pipe;
FIG. 5 is an enlarged side view of the liquid cooled long rigid support shown in FIG. 4 to more clearly show the water inlet and outlet pipes and the flow pattern created within the support to assure even cooling of the unit;
FIG. 6 is a cross-sectional view of the liquid cooled long rigid support of FIG. 5 taken along the lines 6--6 in the direction of the arrows;
FIG. 7 is a 4cross-sectional view of the liquid cooled long rigid support of FIG. 5 taken along the lines 7-7 in the direction of the arrows;
FIG. 8 is a cross-sectional view of the liquid cooled long rigid support of FIG. 5 taken along the lines 8 8 in the direction of the arrows; and
FIG. 9 is 'a side view of the liquid cooled long rigid support shown in FIG. 4 in place in a BOF and clearly shows the manner in which the shooting pipe is mounted in the mobile frame.
In FIG. 1, there is shown hte long rigid support 10 for the shooting pipe 24, which support is capable of withstanding the furnace heat. The shooting pipe is equipped with a suitable discharge nozzle 31 for the refractory coating material and is rotatably and slidably mounted on the support. The support 10 has a counterweight 11 at its outboard end to balance the support on the rollers 12 (seeFIG. 3). The counterweight 11 is made up of small weights and may be varied in value by the removal or addition of the weights so as to keep the support in balance for maneuverability at all times. The support 10 is fabricated of four longitudinally arranged angles 13, 14, 15 and 16, as shown in this View. The vertical bracing consists of bars 17, 18,/
19 and 20 which are welded in place as shown, and the number and placement of these bars will depend upon the length of the support and the size and weight of the shooting pipe 24 to thus form a long rigid balanced shooting pipe support which has its center of balance at the point 21 where the vertical braces are placed to distribute the loading to the top member 14V and also provide a point for disassembly. The bottom of the support is dat and it is therefore possible to slide the support upon the rollers 12 into or out of the furnace the necessary distance to allow spraying in various selected positions and in addition allow for horizontal and vertical rocking movements of the support upon the rollers. The shooting pipe 24 is placed longitudinally along the top of the support 10 in the brackets 25, 26, 27, 28 and 29' which are arranged to freely allow the insertion and turning of the shooting pipe 24` `in the holes 30 as well as to allow it to be moved back and forth in an endwise direction. The shooting pipe support 10 is divided into a plurality of sections and the sections bolted together, as shown in FIG. l, but the brackets 25, 26, 27, 28 and 29 for the shooting pipe will remain the same and will be lined up to accept the pipe therein. In most all instances, it will be preferable to sectionalize the support 10 at the point 21 to allow the counterweighted rear section thereof to be handled separately as a small section. It may also be desirable to make the main portion of the support in two sections, one of which may be arranged to hinge upwardly, as shown at 22, and fold over the other half to avoid problems in storage. In order to do this the shooting pipe would be withdrawn.
The far side of the shooting pipe support, looking at FIG. 2, will be similarly constructed and the complete unit will therefore form a long stiftc beam. Likewise the top and bottom of the support will be similarly formed with suitable stiifeners along its length. It will be noted that the counterweighted end of the support beyond the roller 12 is sloped gradually downwardly to provide space above it to manipulate the shooting pipe 24. T he same is true of the long section of the support which is inserted into the furnace, but here the top is kept straight and the bottom slopes upwardly toward the end of the' support while the two vertical sides remain parallel. This is also done for a further reason, namely, to keep down the weight and give a straight dat surface upon which the support may be rolled into and out of the furnace but in no case does the shape affect the supports rigidity. The support may also be made of other shapes, such as triangular, hexagonal, etc., depending upon the circumstance and equipment available to handle it. The support may be fabricated of ordinary steels where short spray periods will be used, but where longer spray periods are encountered it is desirable to use stainless steels entirely.
The shooting pipe 24 is inserted into the support 10 from the counterweighted end and once inserted the spray nozzle 31 may be screwed in place and thus be ready for spraying. The spray nozzle 31 is arranged with an angularly disposed discharge portion 32 and its outboard end is closed by means of a cap 33, while the body of the nozzle is fastened to the shooting pipe 24 `by means of coupling 34 to make it possible, when desired, to reverse the nozzle on the end of the shooting pipe when it is necessary to spray the neck portion of the furnace. The spray nozzle 31 may be made with the discharge portion 32 at various angles from 30 to 90 to thus cover the entire periphery of the furnace from top t0 bottom. If the shooting pipe support is Very long and greater rigidity is desired, it is possible to use angle for the vertical and horizontal cross braces. The smaller.'
or nozzle end of the support is formed by a square of angles with cross bracing therein welded together with the longitudinal angles welded thereto to form a rigid end (see FIG. 2). The support 10 may be designed for liquid cooling by substituting tubing or pipe for the angles and inserting a pressure tank at the small end which is inserted into the furnace and by using two of the longitudinal pipes to supply cool liquid to the tank and two pipes to return the warm liquid for discharge or recooling, as desired. As a precautionary measure, the warm liquid pipes should be fitted with safety valves in case vapor is generated in the pipes due to cooling liquid flow failure.
The discharge nozzle 31 may also be used to measure the thickness of the lining in the furnace. A series of offsets from the centerline of the furnace may be worked out to determine from these offsets, using the length of the boom and the subtended angle of the boom from the centerline of the furnace, a particular offset which will, when using the inside face of the shell of the furnace as the reference point, give the remaining thickness of the lining. The shooting pipe 24 may also be scribed or punchmarked to indicate the length protruding beyond the support 10 to form a control means for locating the spray nozzle longitudinally in the furnace when particular areas are to be sprayed. In addition the location of the discharge portion 32 can also be marked so that the operator can more closely control the spray pattern. It is even possible to clamp a split gear over the shooting pipe 24 and make a turning device for continuously rotating it or for turning it through definite angles and thus spray selected areas to still further simplify the control of the spray pattern. Where it is desired to rotate the shooting pipe completely around or in wide areas, the pipe will be fitted with a ball joint 52 at its outboard end which will allow complete freedom of movement without having to ltwist or turn the flexible conduit 53 supplying the slurry to the shooting pipe. It can thus be seen that the support 10 for the shooting pipe 24, with the reversible spray nozzle 31 mounted thereon, is of extreme importance because, without it, it would be diicult or impossible to spray the refractory material onto the lining, since the spray pipe alone gets hot and bends and would deect from the reaction force of the issuing spray and make it extremely hard to cover definite areas of the furnace lining.
FIGS. l and 2 disclose the long rigid support in its simplest form; more exotic forms will later be disclosed for use in larger furnaces, where longer supports are necessary and Where longer spraying periods are necessary.
In designing the shooting pipe support 1i), the size of the furnace is of necessity the prime factor which will control its length, as it must be possible to reach the entire area of the furnace lining. After determining the length of the support, it will then be necessary to determine the shooting pipe size and its weight when filled with sprayable slurry as Well as the time necessary to build up the lining and subject the support to the heat of the furnace during that period. We Will then have all the controlling factors for the design of the lightest unit possible and one with the greatest rigidity and mobility and with the necessary heat resistance, If very long shooting periods are to be used, as in the larger furnaces (250 tons to 350 tons), recourse Will have to be made again to liquid cooling which will again add weight to the support and necessitate further design to take care of the added weight and the possibility of vapor generation in the cooling system. As a note of caution, when liquid cooling is used, complete testing of the unit under extreme pressures and temperatures are necessary to insure tightness and rigidity because, if during use in the furnace a liquid leak develops, the possibility is that the lining Will be badly spalled.
FIG. 3 discloses, in connection with the furnace 38 which occupies a substantially horizontal position, the mobile frame 35 in which the long rigid support 10 is mounted. This frame 35 is capable of movement on the oor 37 towards and from the furnace 38 to thus control the endwise movement of the long rigid support 10 in and out of the furnace 38. The mobile frame 35 is equipped with the chain hoist 36 which is connected to the support 10 at its counterweight end 11 and is movable with the support during such movements.
The mobile frame 35 consists of an inverted U-shaped frame arrangement having an overhead I beam 41 supported on two inverted U-shaped supports 42 and 43 equipped with wheels 44 and 45 to allow the whole frame to be moved about on the oor 37. The supports 42 and 43 are diagonally braced to the I beam 41 by means of angular braces 46 and 47 to stiffen the whole assembly and make it extremely rigid. The carriage 48 is arranged to mn on the bottom ange of the I beam 41 having the two sets of wheels 49 and 50 (one side only shown, duplicate set on other side of beam to ride on flange of beam) upon which it will be moved to thus maneuver the support 10 within furnace 38. The carriage 48 is arranged to support the chain hoist 36 to assist in effecting the maneuvering of the support 10 in the furnace and, as stated above, the chain hoist is secured to the counterweighted end 11 of the support 10 through an extension 10a via chain 51, whereby the support 10 can be vertically or horizontally rocked on the rollers 12 as well as slid into or out of the furnace on the I beam 41 and the rollers 12. The support 42 is used to carry the shield 39 containing the opening 40 through which the long rigid support 10 may be moved back and forth on rollers 12 or swung sideways in the furnace. The shield 39 is fastened to the support 42 by eans of brackets 55 and 56 and is completely fabricated of steel plate and angles and is lined with insulating refractory material to protect the operator from the furnace heat. Where extremely long periods of shooting are used, the shield 39 may be fitted with suitable additional windows containing tinted shatter and heat proof glass or steel screening for operator protection and comfort. The lower end of the shield is equipped with additional wheels 44a where very heavy long rigid supports 10 are used in order to insure that the back wheels 45 will stay on the floor 37 without adding weights to the support member 43.
The shooting pipe 24 is arranged at its outboard end with a suitable rotary joint 52 interposed between said pipe and conduit 53 to allow the shooting pipe to be rotated and moved back and forth on the support. The conduit 53 is connected to a suitable mixer arranged to supply refractory material thereto in proper form for spraying. The shooting pipe 24 may also be arranged at the outboard end to mix the refractory material in said shooting pipe by adding a mixing chamber for the material and water and to form the sprayable slurry therein.
The extension 10b is controlled and contained by a circular ring of suitable diameter to allow the support 10 to be maneuvered in the furnace to spray the lining in a circular pattern and thereby furnish an additional means to control the spray pattern within the furnace. The circular ring 100 is suspended from the beam 41 by means of the clamp 101 and the depending support 102 to thereby form a rigid guide means for controlling the spray pattern within the furnace 38.
FIG. 4 is a side view of a liquid cooled long rigid support 55 in the form of a tubular liquid cooled version with the shooting pipe 24 mounted internally therein for complete rotation as well as for lateral movement, whereby it is possible to spray complete sections of the furnace lining as Well as to allow abraded, eroded and spalled Iareas to be built up with extreme accuracy and control.
The support 55 is completely fabricated from tubing and annular rings of suitable sizes and poses no problem in assembling. The center tube 56 is tted with four annular rings 57, 58, 59 and 60 welded in place on the center tube 56 as shown; annular ring 57 has no openings therein and is arranged to receive the tube 61 on its outside circumference to form the end closure for the tubular liquid coolant passage; annular ring 58 is also welded in place on the center tube 56 and outer tube 61 as shown to form the liquid coolant reservoir at the inboard end of the support wherein the flow of liquid coolant is reversed; and ring 58 is formed with a suitable plurality of holes arranged to receive the ends of the tubes used to supply the liquid coolant to the unit and in addition has holes for the coolant to flow therethrough and return through the outer tube. The annular ring 59 is formed with the same plurality of holes as the ring 58 and is welded on its inside face to the tube 56 and on its outer face to the tube 61, and the liquid coolant supply tubes are welded into the holes contained in the rings 58 and 59 to thus form the means for supplying the inboard end reservoir with the liquid coolant. The annular ring 60, with the liquid coolant inlet 62 on its outside face, is then welded in place on and in the tubes 56 and 61 to form the liquid coolant entrance reservoir and supply the liquid coolant to the tubes, carrying it to the inboard reversing flow reservoir contained between the annular rings 57 and 58. The use of the tubes here is more or less of a necessity, as the liquid coolant in the whole length of the tubes contained between tubes 56 and 61 must be cooled, and the liquid coolant entering the passages in the tubes is at the lowest temperature and will therefore continuously cool the liquid coolant beyond the normal ow pattern. The return fiow tube 63 is then installed, using the two annular rings 64 and 65 and welding the whole assembly into place to form the return liquid coolant passage with the pipe 66 contained on the outside face of the ring 65, carrying all the hot liquid coolant out for cooling and returning into inlet pipe 62. It will be noted that the tube 61 is formed with a suitable number of radial holes in its periphery beyond the annular ring 64 to allow the coolant to ow outwardly into the passage between the two tubes 61 and 63 and thus allow the hot liquid coolant to be ejected outwardly into the rearwardly directed passage for discharge therefrom. The design of the long rigid support 55 is such as to insure maximum coolness of the inboard end and also to allow the unit to be balanced on its outboard extending portion to facilitate its maneuvering in the furnace. In designing the support, cognizance will have to be taken of the weight of the coolant contained therein in order to get proper balancing; and, in view of the extended periods of spraying used with this type of support, the use of stainless steels are necessary in the fabrication and welding of the unit. This is also particularly desirable if water is used as a coolant, as the stainless steels will obviate the formation of rust and scale and eliminate possible clogging of the tubes or passages.
In reference to FIG. 6, the annular ring 58 is welded in place between the two tubular members 56 and 61 concentrically mounted and arranged to accept the four tubes 70, 71, 72 and 73 mounted and welded thereto to carry the liquid coolant therein to the inboard reversing reservoir. The annular ring 58 is also formed with four additional holes having the same cross-sectional area as that of the liquid supply tubes and equally spaced between the tube inlets to allow the liquid coolant to flow therethrough and keep a constantly replaced reservoir of the liquid coolant in the inboard reservoir, which is subjected to the greatest heat, and circulate back through the support cooling it enroute still further and nally allow it to ilow outwardly through the radially drilled holes in tube 61 into the space between the concentric tubes 61 and 63 and then empty out in pipe 66. It will be seen that the design of the support is such as to preclude the formation of hot spots and high temperature differentials of said liquid coolants flowing therein, thereby insuring even temperature gradients to be set up over the entire length of said support to insure continued even cooling with no failures.
FIG. 7 is a cross-sectional view of the liquid cooled long rigid support 55 taken along the lines 7 7 of FIG, 5, and shows the radial holes in the tube 6]. so placed as to allow the liquid coolant flowing back from the inboard reversing reservoir to be discharged radially into the space between the two tubes 61 and 63 and then discharged into water outlet 66. The complete theory of the operation of the coolant system is to allow the cold water to enter the tubes and be conveyed to the inboard reversing reservoir but in so doing the water is warmed rst by the water situated beyond the radial holes or beyond the normal flow pattern (to help keep this cool), then is further warmed by the return flow of hot water returning from the reversing reservoir and then to be discharged into the reversing reservoir for further warming and ow outwardly to the outlet pipe. In this manner, the water is warmed up in steps and not ejected as cold water into the reversing reservoir.
Referring to FIG. 8, the annular ring 59 is welded in place between the two tubular members 56 and 61 concentrically mounted and arranged to accept the four tubes 70, 71, 72 and 73 mounted and welded thereto to carry the liquid coolant therein to the inboard reversing reservoir contained between the annular rings 57 and 58 and in addition to cool the liquid coolant contained in the reservoir beyond the holes in the tube 61. The arrangement shown discloses the dual role of the tubes 70, 71, 72
and 73 in the carrying of the liquid coolant therethrough, and it can be readily seen that this arrangement insures that there will be no hot spots or areas with extreme ternperature differentials developed in the liquid coolant system which could cause serious trouble. The liquid cool-` ant outlet pipe 66 should be fitted with a pressure relief valve set to relieve the pressure in the system at from 50# to 75# above the pressure used in the liquid coolant system. This precaution is desirable because it is conceivable that something could happen to the liquid coolant supply system and with the high temperatures developed and existing in the furnace, it would not be long before the liquid coolant would be vaporizing and creating high pressures therein which could cause failures in the support if not promptly relieved.
In the water cooled version of the long rigid support 55, the support and control means 75 used to control the movement of the support 55 consists again of a mobile frame in the shape of an inverted U-frame arrangement having an overhead I beam 76 supported on two inverted U-shaped supports 77 and 78 equipped with wheels 79 and 80 to allow the whole frame to be moved about on the oor 37. The supports 77 and 78 are diagonally braced to the top of the I beam by means of braces 81 and 82, and it will be noted that the I beam 76 is suspended under the U-shaped supports 77 and 78 and that the braces 81 and 82 also go to the top of the I beam to thus leave the bottom flange clear for the entire length between supports. This combination of the supports and the diagonal bracing stiffens the whole assembly and makes it extremely rigid while still allowing the carriage 83 on the bottom ange of the beam to be moved from one end of the beam to the other without any diiculty. The I beam 76 is arranged to accept the carriage 83 having two sets of wheels 84 and 85 (one side only shown, duplicate set on other side to ride on flange of beam) upon which it will be moved to thus maneuver the support 55 within the furnace 38. The carriage 83 is arranged to support the chain hoist 86, which is secured to the support 55. The support 55 is arranged with a circular ring 87 and the lifting chain of the chain hoist 86 is placed in the deep groove of the ring 87 to form the lifting means. In addition, the circular ring S7 is made in halves which are secured together by means of bolts and wing nut to render said ring readily movable along the length of the outboard section of the support 55. It will be noted that the extreme outboard end of the support 55 is equipped with a counterweight 88 secured by means of a chain 89 in the ring 90, which latter is also a split ring and may be moved. It is evident therefore that the two means'of controlling the maneuverability of the support 55 are the chain hoist and its positioning thereon and the counterweight with its positioning and weight control, providing an infinitely varying control means. The support 55 is equipped with the water inlet pipe 62 and water outlet pipe 66 to which hoses 91 and 92 are connected to allow liquid coolant to be circulated therethrough and keep said support cool for longer periods of time and therefore allow longer spray periods to be used than would be possible without cooling.
The liquids used for cooling can be water, Prestone or any other liquid which will carry off heat and not cause any contamination problems. If a constant source of coolant liquid is not available, a cooling tower can be resorted to or a heat exchanger put in the circuit to cool the liquid.
The shooting pipe 24 contained in the support 55 is supplied with refractory coating material of suitable viscosity by means of conduit 53 with the rotary joint 52 interposed between said pipe and conduit to allow the shooting pipe to be rotated completely or partially as the spray pattern demands.
The outboard end of the shooting pipe may be equipped with suitable indicating means to show the angle of discharge of the nozzle as well as the positioning in the furnace. The shooting pipe may also be equipped with suitable apparatus to continually turn it at any given rate desired in order, when an overall spray coating is desired, to move the shooting pipe longitudinally at a constant rate and accomplish this feat without any problem.
A further variation of the instant disclosure is to make two concentric tubes separate and distinct one from the other and allow the inner liquid cooled tube to be moved inside the outer liquid cooled tube for further variations in design and construction which will provide greater latitude in operation than that already disclosed herein.
The mobile frame 75 of the second embodiment shown in FIG. 9 is also fitted in this instance with a shield 95 fastened on the support 77 and is formed with the opening 96 through which the support 55 may be moved into and out of the furnace as well as rocked both vertically and laterally to locate the discharge nozzle in different selected positions within the furnace. The shield 95 is also lined with a suitable light weight refractory or other heat insulating lining capable of withstanding the heat of the furnace to protect the operators and still allow them to see what they are doing inside the furnace. The mobile frame 75 of FIG. 9 may also be used with the shooting pipe support 10 shown in FIGS. l, 2 and 3 where it is desired to facilitate the movement of said support into and out of the furnace. The support 10 will be mounted on a heavy prefabrica-ted yoke equipped with a roller arranged across the bottom of the yoke. The yoke is then mounted on a hook of the chain .hoist 86 and said chain hoist will allow the balanced support to be moved up and down on the carriage 83 and the whole apparatus can be moved on the beam 76. Such an arrangement allows for complete freedom of movement of the support without resorting to rollers on the shield 95, In this manner, the mounting of the support is completely divorced from the shield.
It may also be noted that the shield 95 of FIG. 9 and the shield 39 of FIG. 3 may be made in the form of hinged sections which may be folded together for ease of movement of the mobile frame on the floor.
It is also possible to use the instant designs or their equivalent for supports and apply them to such equipment as pay loaders, etc. or to cars designed to run on the rails alongside the BOFs. In these instances the supports may be designed to telescope, one section within the other, and be mechanically, electrically or hydraulically actuated, and may even be water cooled where large furnaces are to be sprayed for long periods of time. This type of equipment will also allow the shooting pipe to be inserted inside or nested on the outside, depending on the design of the support and the actuating means employed. It is also possible to use the supports disclosed herein and use either air or oil for actuating cylinders which will dispense with the chain hoists per se but will still necessitate means to move the supports into and out of the furnace.
The long rigid support, the shooting pipe equipped with a suitable discharge nozzle, the mobile frame and the equipment for handling the long rigid support therefore form a combination which allows the application of protective refractory coatings to the refractory 1ining of a basic oxygen furnace while it is at or near operating temperature. In addition the same apparatus can be used on occasions to apply protective refractory coatings before the furnace is put in operation to further protect the lining when the furnace is put on the line.
The means for controlling the spray pattern and called herein the discharge nozzle has been covered by an issued Patent No. 2,997,244 while a further version is disclosed in copending application Ser. No. 402,203, filed Oct. 7, 1964.
The apparatus of this application is :specifically designed for the practice of the process disclosed in copending application Ser. No. 424,071, led Jan. 7, 1965.
The refractory material used for the repair and coating of the furnace linings may be of any type so long as it is suitable and effective for the practice of the invention as herein described. However, reference is made to the three following patents owned by the assignee of the instant application as examples of suitable refractory materials:
No. 2,809,126, dated Oct. 8, 1957, wherein the coating composition consists primarily of chrome ore;
No. 3,093,496, dated June 11, 1963, wherein the coating composition consists of a mixture of chrome ore and magnesia but wherein the chrome ore predominates;
No. 3,093,497, dated June 1l, 1963, wherein the coating composition consists of a mixture of chrome ore and magnesia but wherein the magnesia predominates.
Reference is also made to Patent No. 3,093,458, dated I une l1, 1963, also owned by the assignee of the instant application, and wherein refractory compositions of different refractoriness are employed in building up a multiple layer coating.
Another refractory material which may be used for the repair and coating of the furnace linings is disclosed in the copending Dreyling et al. application Ser. No. 173,839, filed Feb. 16, 1962, which material consists essentially of dead burned or fused magnesite containing certain binding and barrier materials.
Different types of spraying apparatus may be employed in carrying out the process and reference is made to the following patents all owned by the assignee of the instant application:
No. 2,700,535, dated Ian. 25, 1955 No. 3,114,536, dated Dec. 17, 1963 Reference is also made to the following copending applications which also disclose further types of spraying apparatus that may be used in carrying out the instant process:
Demaison application Ser. No. 319,001, filed Oct. 25,
1963 now Patent No, 3,248,093
Demaison application Ser No. 383,416, filed July 17,
Demaison application Ser. No. 402,203, led Oct. 7,
What is claimed is:
1. An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining, comprising in combination, a long rigid shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat and adapted to 4be moved endwise into and out of the furnace when the latter occupies a substantially horizontal position, the length of said support being substantially equal to the length of the furnace lining and a mobile frame carrying said support and located on a platform in proximity to the furnace, said support extending longitudinally of the mobile frame and when located out of the furnace projecting toward the furnace for a substantial distance from the furnace confronting end of the mobile frame, and said mobile frame being freely maneuverable on the platform to locate the shooting pipe support in position to enter the furnace at different angles and then movable toward and from the furnace in effecting the movements of the support into and out of the furnace.
2. An apparatus according to claim 1, wherein the support is movable different distances into the furnace by the movement of the mobile frame alone to locate the discharge nozzle in different selected endwise positions therein in applying the protective refractory coating to the furnace lining.
3. An apparatus according to claim 1, wherein the shooting pipe support is slidably mounted `on the mobile frame for endwise movement with reference thereto to vary the endwise position of the discharge nozzle within the furnace while the mobile frame remains stationary.
4. An apparatus according to claim 1, wherein the shooting pipe support is mounted on the frame for a vertical rocking movement in its own plane to locate the discharge nozzle in different selected vertical positions within the furnace after the support has been moved endwise into the furnace by the mobile frame.
5. An apparatus according to claim 1, wherein the shooting pipe support is mounted on the frame for a lateral rocking movement in its own plane to locate the discharge nozzle in different selected lateral positions Within the furnace after the support has been moved endwise into the furnace by the mobile frame.
6. An apparatus according to claim 1, wherein the shooting pipe support is mounted on the frame for both vertical and lateral rocking movements in its own plane to locate the discharge nozzle in different selected vertical and lateral positions within the furnace after the support has been moved endwise into the furnace by the mobile frame.
7. An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining, comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the furnace, said frame being movable toward and from the furnace in effecting an endwise movement of the support with the shooting pipe thereon into and out of the furnace when the latter occupies a substantially horizontal position, and means for mounting the shooting pipe support on the mobile frame for a vertical rocking movement when said support is moved endwise into the furnace in order to locate the discharge nozzle in different vertical positions within the furnace, said mounting means including a supporting roller upon which the shooting pipe support rests and fulcrums.
8. An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining, comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the furnace, said frame being movable toward and from the furnace in effecting an endwise movement of the support with the shooting pipe thereon into and out of the furnace when the latter occupies a substantially horizontal position, and means for mounting the shooting pipe support on the mobile frame for a vertical rocking movement when said support is moved endwise into the furnace in order to locate the discharge nozzle in different vertical positions within the furnace, said shooting pipe support being provided at its end remote from the discharge nozzle with a weight to locate the balance point of the support near said end.
9. An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining, comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the furnace, said frame being movable toward and from the furnace in effecting an endwise movement of the support with the shooting pipe thereon into and out of the furnace when the latter occupies a substantially horizontal position, and means for mounting the shooting pipe support on the mobile frame for a vertical rocking movement when said support is moved endwise into the furnace in order to locate the discharge nozzle in different vertical positions within the furnace, said mounting means including an overhead trolley adapted to run on a track extending fore-and-aft of the mobile frame.
10. An apparatus according to claim 9, wherein the connection between the shooting pipe support and the overhead trolley includes a chain and pulley arrangement for raising and lowering the support with reference to the mobile frame.
11. An apparatus according to claim 9, wherein the overhead trolley is connected to the support at a point about which it rocks.
12. An apparatus according to claim11, wherein the shooting pipe support is provided at its end remote from the discharge nozzle with a weight which balances the support about its rocking point.
13. An apparatus according to claim 11, wherein the connection between the shooting pipe support and the overhead trolley is such as to permit the support to be rocked laterally as well as vertically at its rocking point.
14. An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining, comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, and means whereby said support with the shooting pipe thereon may be moved endwise into and out of the furnace when the latter occupies a substantially horizontal position, said shooting pipe support being in the form of a cylindrical water jacket surrounding the shooting pipe but separate and distinct therefrom and comprising a series of concentrically disposed water circulating pipes extending substantially throughout the length of the jacket.
15. An apparatus according to claim 14, wherein certain of said circulating pipes are connected to a water inlet andthe remaining pipes to a water outlet.
16. An apparatus according to claim 14, wherein the Water jacket is formed at one end with a water space con nected to a water inlet and communicating with certain of the water circulating pipes at one end and wherein said jacket is formed at the opposite end with a similar water space connected with a water outlet as well as with the remaining water circulating pipes at the opposite end.
17. An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining, comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the support, said frame being maneuverable on the platform to locate the shooting pipe support in position to enter the furnace, and means for mounting the shooting pipe support in the mobile frame for endwise movement with reference to the frame when so positioned in order to move the support with the shooting pipe thereon into and out of the furnace while the frame remains stationary, said mounting means including an overhead trolley adapted to run on a track extending fore-and-aft of the mobile frame.
18. An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the li-fe of said lining, comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat, a mobile frame carrying said support and located on a platform in proximity to the support, said frame being maneuverable on the platform to locate the shooting pipe support in position to enter the furnace, and means for mounting the shooting pipe support in the mobile frame for endwise movement with reference to the frame when so positioned in order to move the support with the shooting pipe thereon into and out of the furnace While the frame remains stationary, said mounting means including a roller upon which the shooting pipe support rests and moves and an overhead trolley adapted to run on a track extending tore-and-aft of the mobile frame.
19. An apparatus for applying a protective refractory coating to the refractory lining of a basic oxygen furnace while it is at or near operating temperature in order to prolong the life of said lining, comprising in combination, a shooting pipe for the refractory coating material equipped with a suitable discharge nozzle, a long rigid support for the shooting pipe capable of withstanding the furnace heat and adapted to be moved endWise into and out of the furnace when the latter occupies a substantially horizontal position, and a mobile frame carrying said support and located on a platform in proximity to the furnace, said support when located out of the furnace projecting toward the furnace for a substantial distance from the furnace side of the mobile frame, and said mobile frame being maneuverable on the platform to locate the shooting pipe support in position to enter the furnace and then movable toward and from the furnace in effecting the movements of the support into and out of the furnace, characterized in that the shooting pipe support is arranged in the mobile frame to be rocked to cause the discharge nozzle to describe a circle of given diameter within the furnace.
References Cited UNITED STATES PATENTS 949,290 2/ 1910 Alelder et al 239-187 982,625 1/ 1911 Mitchell et al 239-187 1,541,621 6/1925 Carini 239-187 2,541,695 2/ 1951 Gangewere 239-227 2,794,681 6/1057 Suess Z39-132.3 X 2,894,485 7/ 1959 Sedlacsik 118-323 X 3,130,077 4/1964 Burden 239-187 X 3,170,977 2/1965 Obenchain Z39-132.3 X
FOREIGN PATENTS 1,224,130 2/1960 France.
366,442 1/ 1923 Germany.
M. HENSON WOOD, JR., Primary Examiner. V. C. WILKS, Assistant Examiner.

Claims (1)

1. AN APPARATUS FOR APPLYING A PROTECTIVE REFRACTORY COATING TO THE REFRACTORY LINING OF A BASIC OXYGEN FURNACE WHILE ITS IS AT OR NEAR OPERATING TEMPERATURE IN ORDER TO PROLONG THE LIFE OF SAID LINING, COMPRISING IN COMBINATION, A LONG RIGID SHOOTING PIPE FOR THE REFRACTORY COATING MATERIAL EQUIPPED WITH A SUITABLE DISCHARGE NOZZLE, A LONG RIGID SUPPORT FOR THE SHOOTING PIPE CAPABLE OF WITHSTANDING THE FURNACE HEAT AND ADAPTED TO BE MOVED ENDWISE INTO AND OUT OF THE FURNACE WHEN THE LATTER OCCUPIES A SUBSTANTIALLY HORIZONTAL POSITION, THE LENGTH OF SAID SUPPORT BEING SUBSTANTIALLY EQUAL TO THE LENGTH OF THE FURNACE LINING A MOBILE FRAME CARRYING SAID SUPPORT AND LOCATED ON A PLATFORM IN PROXIMITY TO THE FURNACE, SAID SUPPORT EXTENDING LONGITUDINALLY OF THE MOBILE FRAME AND WHEN LOCATED OUT OF THE FURNACE PROJECTING TOWARD THE FURNACE FOR A SUBSTANTIAL DISTANCE FROM THE FURNACE CONFRONTING END OF THE MOBILE FRAME, AND SAID MOBILE FRAME BEING FREELY MANEUVERABLE ON THE PLATFORM TO LOCATE THE SHOOTING PIPE SUPPORT IN POSITION TO ENTER THE FURNACE AT DIFFERENT ANGLES AND THEN MOVABLE TOWARD AND FROM THE FURNACE IN EFFECTING THE MOVEMENTS OF THE SUPPORT INTO AND OUT OF THE FURNACE.
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US3473737A (en) * 1966-03-09 1969-10-21 Kaiser Aluminium Chem Corp Apparatus for gunning refractory material having adjustable nozzle positioning means
US3518330A (en) * 1965-01-07 1970-06-30 Quigley Co Method for prolonging the life of the cone section of the refractory lining of a basic oxygen furnace of the kaldo type
US3603096A (en) * 1969-12-10 1971-09-07 Atomic Energy Commission Apparatus for installing a reinforced vessel in an underground cavity
US3653951A (en) * 1969-04-03 1972-04-04 Martin Marietta Corp Method for rapidly coating surfaces with wet, particulate materials
US3662709A (en) * 1969-08-19 1972-05-16 Nathan Janco Apparatus for coating the inside of a cylindrical member
US3799445A (en) * 1973-04-30 1974-03-26 Pfizer Vertical remote-controlled refractory gunning apparatus
US3858552A (en) * 1971-09-28 1975-01-07 Nippon Kokan Kk Apparatus for coating the inside of pipe
JPS506506A (en) * 1973-05-21 1975-01-23
JPS508107U (en) * 1973-05-22 1975-01-28
US3897263A (en) * 1973-11-02 1975-07-29 Oliver Thurston Davis Apparatus for washing and disinfecting trailer or van interiors
US3902669A (en) * 1973-11-15 1975-09-02 Richard C Keibler Spraying apparatus
US3917170A (en) * 1974-07-19 1975-11-04 Quigley Co Mobile refractory gunning apparatus
JPS5178256U (en) * 1974-12-17 1976-06-21
FR2302163A1 (en) * 1975-02-26 1976-09-24 Martin Et Pagenstecher Gmbh METHOD AND DEVICE FOR FORMING THE REFRACTORY COATING OF A TUBULAR CONTAINER
US4058258A (en) * 1974-07-29 1977-11-15 Rosen Paul W Interior pipe coating apparatus
US4077848A (en) * 1976-12-10 1978-03-07 United States Steel Corporation Method and apparatus for applying patching or sealing compositions to coke oven side walls and roof
US4120260A (en) * 1976-04-19 1978-10-17 Kurosaki Refractories Co., Ltd. Apparatus for applying refractory material onto the inner surface of a furnace
US4128207A (en) * 1976-09-29 1978-12-05 Amos Pacht Fluid delivery system
JPS5499008A (en) * 1978-08-28 1979-08-04 Kurosaki Refractories Co Gunning apparatus having pipe rotating system
JPS5499009A (en) * 1978-08-28 1979-08-04 Kurosaki Refractories Co Gunning apparatus having pipe extending system in front and in rear
FR2421684A1 (en) * 1978-04-07 1979-11-02 Cockerill
US4181258A (en) * 1977-03-23 1980-01-01 Quigley Company, Inc. Sprayer for repairing refractory lining
US4201342A (en) * 1978-06-26 1980-05-06 Weldon Hydraulics, Inc. Mobile refractory apparatus for repairing interior furnace walls
US4222975A (en) * 1978-06-21 1980-09-16 Kirschke John A Apparatus and process for repairing underground gasoline tanks
US4225083A (en) * 1976-04-19 1980-09-30 Kurosaki Refractories Co., Ltd. Apparatus for applying refractory material onto the inner surface of a furnace
US4251063A (en) * 1979-07-30 1981-02-17 Goldberg Ilya A Device for guniting the lining of casting ladles
US4385749A (en) * 1970-04-28 1983-05-31 Linden Gerardus A C V D Method and a device for repairing the tap hole of a steel converter
US4455965A (en) * 1982-02-26 1984-06-26 Regie Nationale Des Usines Renault Automatic process and system for painting motor vehicle interiors
US4494737A (en) * 1981-10-08 1985-01-22 Pullman Berry Company Lance for repairing the lining of steelmaking vessels
US4538543A (en) * 1984-11-05 1985-09-03 Kennecott Corporation Apparatus for applying internal coatings in hot vessels
US4779798A (en) * 1987-05-07 1988-10-25 National Refractories & Minerals Corporation Gunning apparatus
US4901985A (en) * 1988-11-10 1990-02-20 Magneco/Metrel, Inc. Apparatus for spraying refractory lining
US4964731A (en) * 1987-05-21 1990-10-23 Oy Lohja Ab Shotcrete gun
US5419922A (en) * 1994-03-15 1995-05-30 Bmi, Inc. Method and apparatus for repairing the refractory lining of a refractory vessel
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US20040250761A1 (en) * 2002-08-07 2004-12-16 Fosbel Intellectual Ag Systems and methods for the high temperature application of pumpable fibrous refractory material
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Cited By (46)

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US3518330A (en) * 1965-01-07 1970-06-30 Quigley Co Method for prolonging the life of the cone section of the refractory lining of a basic oxygen furnace of the kaldo type
US3473737A (en) * 1966-03-09 1969-10-21 Kaiser Aluminium Chem Corp Apparatus for gunning refractory material having adjustable nozzle positioning means
US3653951A (en) * 1969-04-03 1972-04-04 Martin Marietta Corp Method for rapidly coating surfaces with wet, particulate materials
US3662709A (en) * 1969-08-19 1972-05-16 Nathan Janco Apparatus for coating the inside of a cylindrical member
US3603096A (en) * 1969-12-10 1971-09-07 Atomic Energy Commission Apparatus for installing a reinforced vessel in an underground cavity
US4385749A (en) * 1970-04-28 1983-05-31 Linden Gerardus A C V D Method and a device for repairing the tap hole of a steel converter
US3858552A (en) * 1971-09-28 1975-01-07 Nippon Kokan Kk Apparatus for coating the inside of pipe
US3799445A (en) * 1973-04-30 1974-03-26 Pfizer Vertical remote-controlled refractory gunning apparatus
JPS506506A (en) * 1973-05-21 1975-01-23
JPS55674B2 (en) * 1973-05-21 1980-01-09
JPS508107U (en) * 1973-05-22 1975-01-28
US3897263A (en) * 1973-11-02 1975-07-29 Oliver Thurston Davis Apparatus for washing and disinfecting trailer or van interiors
US3902669A (en) * 1973-11-15 1975-09-02 Richard C Keibler Spraying apparatus
US3917170A (en) * 1974-07-19 1975-11-04 Quigley Co Mobile refractory gunning apparatus
US4058258A (en) * 1974-07-29 1977-11-15 Rosen Paul W Interior pipe coating apparatus
JPS5178256U (en) * 1974-12-17 1976-06-21
JPS5432965Y2 (en) * 1974-12-17 1979-10-12
FR2302163A1 (en) * 1975-02-26 1976-09-24 Martin Et Pagenstecher Gmbh METHOD AND DEVICE FOR FORMING THE REFRACTORY COATING OF A TUBULAR CONTAINER
US4120260A (en) * 1976-04-19 1978-10-17 Kurosaki Refractories Co., Ltd. Apparatus for applying refractory material onto the inner surface of a furnace
US4225083A (en) * 1976-04-19 1980-09-30 Kurosaki Refractories Co., Ltd. Apparatus for applying refractory material onto the inner surface of a furnace
US4128207A (en) * 1976-09-29 1978-12-05 Amos Pacht Fluid delivery system
US4077848A (en) * 1976-12-10 1978-03-07 United States Steel Corporation Method and apparatus for applying patching or sealing compositions to coke oven side walls and roof
US4181258A (en) * 1977-03-23 1980-01-01 Quigley Company, Inc. Sprayer for repairing refractory lining
FR2421684A1 (en) * 1978-04-07 1979-11-02 Cockerill
US4222975A (en) * 1978-06-21 1980-09-16 Kirschke John A Apparatus and process for repairing underground gasoline tanks
US4325652A (en) * 1978-06-21 1982-04-20 Kirschke John A Apparatus and process for repairing underground gasoline tanks
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JPS551517B2 (en) * 1978-08-28 1980-01-14
JPS5499009A (en) * 1978-08-28 1979-08-04 Kurosaki Refractories Co Gunning apparatus having pipe extending system in front and in rear
JPS5499008A (en) * 1978-08-28 1979-08-04 Kurosaki Refractories Co Gunning apparatus having pipe rotating system
US4251063A (en) * 1979-07-30 1981-02-17 Goldberg Ilya A Device for guniting the lining of casting ladles
US4494737A (en) * 1981-10-08 1985-01-22 Pullman Berry Company Lance for repairing the lining of steelmaking vessels
US4455965A (en) * 1982-02-26 1984-06-26 Regie Nationale Des Usines Renault Automatic process and system for painting motor vehicle interiors
US4538543A (en) * 1984-11-05 1985-09-03 Kennecott Corporation Apparatus for applying internal coatings in hot vessels
US4779798A (en) * 1987-05-07 1988-10-25 National Refractories & Minerals Corporation Gunning apparatus
US4964731A (en) * 1987-05-21 1990-10-23 Oy Lohja Ab Shotcrete gun
US4901985A (en) * 1988-11-10 1990-02-20 Magneco/Metrel, Inc. Apparatus for spraying refractory lining
US5601051A (en) * 1994-03-15 1997-02-11 Bmi, Inc. Apparatus for repairing the refractory lining of a refractory vessel
US5419922A (en) * 1994-03-15 1995-05-30 Bmi, Inc. Method and apparatus for repairing the refractory lining of a refractory vessel
US5640982A (en) * 1994-11-18 1997-06-24 Landry Service Co. Inc. Tank cleaning system using collapsible robotic tank entry vehicle
US20040250761A1 (en) * 2002-08-07 2004-12-16 Fosbel Intellectual Ag Systems and methods for the high temperature application of pumpable fibrous refractory material
US7114663B2 (en) * 2002-08-07 2006-10-03 Fosbel Intellectual Limited Thermally protected lance for repairing high temperature process vessel walls with pumpable fibrous refractory material and systems employing the same
ITUD20090085A1 (en) * 2009-05-06 2010-11-07 Maen S N C Di Campini Mauro E Camp Ini Enrico EQUIPMENT FOR DISTRIBUTION AND APPLICATION OF A SEALANT AND RELATIVE PROCEDURE
EP2251098A1 (en) * 2009-05-06 2010-11-17 MAEN s.n.c. di Campini Mauro e Campini Enrico Device to distribute and applicate a sealing substance and corresponding method
US20120135670A1 (en) * 2010-09-07 2012-05-31 Baer Timothy S Inside diameter cylindrical blast cleaning attachment apparatus

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