EP0342395B1 - Device for introduction of powdery agents into a melting ladle - Google Patents

Device for introduction of powdery agents into a melting ladle Download PDF

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Publication number
EP0342395B1
EP0342395B1 EP89107446A EP89107446A EP0342395B1 EP 0342395 B1 EP0342395 B1 EP 0342395B1 EP 89107446 A EP89107446 A EP 89107446A EP 89107446 A EP89107446 A EP 89107446A EP 0342395 B1 EP0342395 B1 EP 0342395B1
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EP
European Patent Office
Prior art keywords
pan
lance
axis
outlet nozzles
reagents
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89107446A
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German (de)
French (fr)
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EP0342395A1 (en
Inventor
Frank Dr.-Ing. Schaberg
Heribert Dipl.-Ing. Martens
Peter Dipl.-Ing. Pöhlmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
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Publication date
Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Priority to AT89107446T priority Critical patent/ATE77840T1/en
Publication of EP0342395A1 publication Critical patent/EP0342395A1/en
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Publication of EP0342395B1 publication Critical patent/EP0342395B1/en
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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances

Definitions

  • the invention relates to a device (according to the preamble of claim 1) for introducing powdered reagents into a melting pan.
  • a lance 2 arranged vertically and centrally to the axis of the melting pan 1 is used for introducing powdered reagents into a melting pan 1, the lance 2 at its lower end with a downwardly directed nozzle opening 2a and a number of horizontal nozzle openings distributed evenly over the circumference, e.g. 2b, 2c, is provided.
  • the hatched area 3 in FIG. 2 extends approximately evenly around the lance 2 and is a so-called "rinsing spot", i.e. an area in which the reagents blown out of the nozzle openings enter the melt 4.
  • the pneumatically blown powdered reagents in the melt 4 are moved upward by the carrier air, a flow distribution resulting in the level marked by the dashed line 5, as indicated schematically by curve 6.
  • the flow is directed upwards in the middle area, but downwards in a relatively wide annular edge zone.
  • the invention has for its object to design a device according to the preamble of claim 1 so that the introduction of the powdered reagents is further improved by means of a multi-hole lance in the melting pan, so that a particularly favorable mixing results.
  • the lower lance end containing the nozzle is bent approximately at right angles, and the lance nozzle should be directed towards the opposite pan wall in an area into which the melt to be introduced into the melting pan is poured, so that the melt flow deflected from the pan bottom collides with the reagent flow flowing through the lance nozzle.
  • the lance - according to feature a) - is provided with two outlet nozzles which are offset from one another by an angle between 60 and 120 °, the bisector intersecting the pan axis.
  • the lance is further arranged - according to feature b) - eccentrically to the pan axis, and the two outlet nozzles are directed into the larger region of the pan facing away from the peripheral wall of the pan near the lance and enclosing the pan axis.
  • the mixing time of the melt is significantly reduced compared to known designs, since the changed flow profile results in a more favorable mixing behavior.
  • the rapidly developing flow prevents over-concentrations of the powdered reagents in the melt, thus increasing the degree of utilization and consequently reducing the specific addition quantities and thus the total process costs.
  • a reduction in the specific addition amounts is also achieved by increasing the accuracy with the device according to the invention.
  • 3 to 6 illustrate the device according to the invention.
  • the lance 12 is arranged eccentrically to the axis 10 of the melting pan 11, being 0.2 to 0.8 times, preferably 0.4 to 0.6 times the pan radius R (measured at the bottom of the pan) ) is offset from the pan axis 10.
  • the lance 12 has two outlet nozzles at its lower end 12a, 12b, which are offset from one another by an angle between 60 and 120 °, preferably by an angle between 80 and 100 °, the bisector 20 intersecting the socket axis 10.
  • the two outlet nozzles 12a, 12b are directed into the larger region of the pan 11 facing away from the peripheral wall of the pan 11 close to the lance and including the pan axis 10, so that there is an elongated washing spot characterized by the area 13, the narrow extent of which extends from the lance 12 to a little bit about the axis 10 and its elongated extent extends transversely to it.

Abstract

The invention relates to apparatus for the introduction of reagents in powder form into a melting pan, in which the lance is arranged eccentrically with respect to the pan axis and the outlet nozzles are directed into the larger region of the pan enclosing the pan axis. Such apparatus is distinguished by optimum mixing in of the added reagents.

Description

Die Erfindung betrifft eine Vorrichtung (entsprechend dem Oberbegriff des Anspruches 1) zum Einbringen von pulverförmigen Reagenzien in eine Schmelzpfanne.The invention relates to a device (according to the preamble of claim 1) for introducing powdered reagents into a melting pan.

Bei der Schmelzenbehandlung mit injizierten pulverförmigen Reagenzien, beispielsweise bei der Roheisenentschwefelung oder Stahlbehandlung, kommt es darauf an, durch eine optimale Eingabe von Reagenzien eine bestmögliche Ausnutzung der Reagenzien zu erzielen, um die Verfahrenskosten möglichst zu reduzieren.In the melt treatment with injected powdered reagents, for example in hot metal desulphurization or steel treatment, it is important to achieve the best possible use of the reagents by optimally entering the reagents in order to reduce the process costs as much as possible.

Die Fig.1 und 2 zeigen den bekannten Stand der Technik, von dem die Erfindung ausgeht. Zum Einbringen pulverförmiger Reagenzien in eine Schmelzpfanne 1 dient eine vertikal und zentrisch zur Achse der Schmelzpfanne 1 angeordnete Lanze 2, die an ihrem unteren Ende mit einer nach unten gerichteten Düsenöffnung 2a sowie einer Anzahl von gleichmäßig überden Umfang verteilten horizontalen Düsenöffnungen, z.B. 2b, 2c, versehen ist.1 and 2 show the known prior art, from which the invention is based. A lance 2 arranged vertically and centrally to the axis of the melting pan 1 is used for introducing powdered reagents into a melting pan 1, the lance 2 at its lower end with a downwardly directed nozzle opening 2a and a number of horizontal nozzle openings distributed evenly over the circumference, e.g. 2b, 2c, is provided.

Die in Fig.2 schraffierte Fläche 3 erstreckt sich annähernd gleichmäßig um die Lanze 2 und ist ein sogenannter "Spülfleck", d.h. ein Bereich, in dem die aus den Düsenöffnungen ausgeblasenen Reagenzien in die Schmelze 4 eintreten.The hatched area 3 in FIG. 2 extends approximately evenly around the lance 2 and is a so-called "rinsing spot", i.e. an area in which the reagents blown out of the nozzle openings enter the melt 4.

Durch die Tägerluft werden die pneumatisch eingeblasenen pulverförmigen Reagenzien in der Schmelze 4 nach oben bewegt, wobei sich in dem durch die gestrichelte Linie 5 markierten Niveau eine Strömungsverteilung ergibt, wie sie durch die Kurve 6 schematisch angedeutet ist. Im mittleren Bereich ist die Strömung nach oben gerichtet, in einer verhältnismäßig breiten ringförmigen Randzone dagegen nach unten.The pneumatically blown powdered reagents in the melt 4 are moved upward by the carrier air, a flow distribution resulting in the level marked by the dashed line 5, as indicated schematically by curve 6. The flow is directed upwards in the middle area, but downwards in a relatively wide annular edge zone.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung entsprechend dem Oberbegriff des Anspruches 1 so auszubilden, daß das Einbringen der pulverförmigen Reagenzien mittels einer Mehrlochlanze in die Schmelzpfanne noch weiter verbessert wird, so daß sich eine besonders günstige Durchmischung ergibt.The invention has for its object to design a device according to the preamble of claim 1 so that the introduction of the powdered reagents is further improved by means of a multi-hole lance in the melting pan, so that a particularly favorable mixing results.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the characterizing features of claim 1. Appropriate embodiments of the invention are the subject of the dependent claims.

Aus dem Stand der Technik ist es zwar bereits allgemein bekannt, die Lanze exzentrisch zur Pfannenachse in einer Schmelzepfanne anzuordnen, wie es Beispiele in der US-A-43 41 554 sowie der DE-B-28 27 277 zeigen, wonach ganz offensichtlich jeweils etwa eine einzige, rohrförmige Düse am stirnseitigen unteren Ende der Lanze vorgesehen ist. Im Falle der zuerst genannten US-Patentschrift soll das die Düse aufweisende untere Ende der Lanze schräg nach unten gegen den Boden abgebogen sein, und es wird bevorzugt, dieses untere Lanzenende so anzuordnen, daß der aus der Düsenmündung austretende Gas- bzw. Reagenzienstrom etwa schräg gegen den Pfannenboden sowie allgemein tangential zur Wand der Pfanne gerichtet ist. Bei der einen Ausführungsform gemäß DE-B-28 27 277 ist das die Düse enthaltende untere Lanzenende etwa rechtwinklig abgebogen, und die Lanzendüse soll auf die gegenüberliegende Pfannenwand in einen Bereich gerichtet sein, in den die neu in die Schmelzpfanne einzubringende Schmelze eingegossen wird, damit der vom Pfannenboden abgelenkte Schmelzestrom gegen den durch die Lanzendüse einfließenden Reagenzienstrom prallt.It is already generally known from the prior art to arrange the lance eccentrically to the pan axis in a melt pan, as is shown by examples in US Pat. No. 4,341,554 and DE-B-28 27 277, according to which in each case quite obviously a single, tubular nozzle is provided at the front lower end of the lance. In the case of the first-mentioned U.S. patent, the lower end of the lance having the nozzle is said to be bent obliquely downwards towards the ground, and it is preferred to arrange this lower end of the lance so that the gas or reagent stream emerging from the nozzle mouth is approximately oblique is directed against the pan bottom and generally tangentially to the wall of the pan. In one embodiment according to DE-B-28 27 277, the lower lance end containing the nozzle is bent approximately at right angles, and the lance nozzle should be directed towards the opposite pan wall in an area into which the melt to be introduced into the melting pan is poured, so that the melt flow deflected from the pan bottom collides with the reagent flow flowing through the lance nozzle.

Erfindungsgemäß ist dagegen die Lanze - gemäß Merkmal a) - mit zwei Austrittsdüsen versehen, die um einen Winkel zwischen 60 und 120° gegeneinander versetzt sind, wobei die Winkelhalbierende die Pfannenachse schneidet. Die Lanze ist dabei ferner - gemäß Merkmal b) - exzentrisch zur Pfannenachse angeordnet, und die beiden Austrittsdüsen sind in den der lanzennahen Umfangswand der Pfanne abgewandten, die Pfannenachse einschließenden größeren Bereich der Pfanne gerichtet.According to the invention, however, the lance - according to feature a) - is provided with two outlet nozzles which are offset from one another by an angle between 60 and 120 °, the bisector intersecting the pan axis. The lance is further arranged - according to feature b) - eccentrically to the pan axis, and the two outlet nozzles are directed into the larger region of the pan facing away from the peripheral wall of the pan near the lance and enclosing the pan axis.

Mit einer derartigen Lösung wird im Vergleich zu bekannten Ausführungen die Durchmischungszeit der Schmelze wesentlich verringert, da sich aufgrund des veränderten Strömungsprofiles ein günstigeres Durchmischungsverhalten ergibt. Die sich schnell aufbauende Strömung verhindert Überkonzentrationen der eingeblasenen pulverförmigen Reagenzien in der Schmelze, erhöht damit den Ausnutzungsgrad und verringert infolgedessen die spezifischen Zugabemengen und damit die gesamten Verfahrenskosten.With such a solution, the mixing time of the melt is significantly reduced compared to known designs, since the changed flow profile results in a more favorable mixing behavior. The rapidly developing flow prevents over-concentrations of the powdered reagents in the melt, thus increasing the degree of utilization and consequently reducing the specific addition quantities and thus the total process costs.

Eine Reduzierung der spezifischen Zugabemengen wird auch durch die mit der erfindungsgemäßen Vorrichtung erzielte Erhöhung der Treffsicherheit erreicht.A reduction in the specific addition amounts is also achieved by increasing the accuracy with the device according to the invention.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert. In der Zeichnung zeigen

  • Fig.1 und 2 Schnitt und Aufsicht einer bekannten Vorrichtung,
  • Fig.3 und 4 Schnitt und Aufsicht einer erfin dungsgemäßen Vorrichtung,
  • Fig.5 und 6 Schnitt und Aufsicht der erfindungsgemäßen Vorrichtung (um 90° gegenüber den Darstellungen in den Fig.3 und 4 gedreht).
The invention is explained in more detail below with reference to the drawing. Show in the drawing
  • 1 and 2 section and top view of a known device,
  • 3 and 4 section and top view of a device according to the invention,
  • 5 and 6 section and top view of the device according to the invention (rotated by 90 ° with respect to the representations in FIGS. 3 and 4).

Die Fig.3 bis 6 veranschaulichen die erfindungsgemäße Vorrichtung.3 to 6 illustrate the device according to the invention.

Die Lanze 12 ist exzentrisch zur Achse 10 der Schmelzpfanne 11 angeordnet, wobei sie um das 0,2- bis 0,8-fache, vorzugsweise um das 0,4- bis 0,6-fache des Pfannenradius R (gemessen am Boden der Pfanne) gegenüber der Pfannenachse 10 versetzt ist.The lance 12 is arranged eccentrically to the axis 10 of the melting pan 11, being 0.2 to 0.8 times, preferably 0.4 to 0.6 times the pan radius R (measured at the bottom of the pan) ) is offset from the pan axis 10.

Bei dem dargestellten Ausführungsbeispiel ist die Lanze 12 an ihrem unteren Ende mit zwei Austrittsdüsen 12a, 12b versehen, die um einen Winkel zwischen 60 und 120°, vorzugsweise um einen Winkel zwischen 80 und 100°, gegeneinander versetzt sind, wobei die Winkelhalbierende 20 die Pfannenachse 10 schneidet.In the illustrated embodiment, the lance 12 has two outlet nozzles at its lower end 12a, 12b, which are offset from one another by an angle between 60 and 120 °, preferably by an angle between 80 and 100 °, the bisector 20 intersecting the socket axis 10.

Wie Fig. 4 zeigt, sind die beiden Austrittsdüsen 12a, 12b in den der lanzennahen Umfangswand der Pfanne 11 abgewandten, die Pfannenachse 10 einschließenden größeren Bereich der Pfanne 11 gerichtet, so daß sich ein durch die Fläche 13 gekennzeichneter länglicher Spülfleck ergibt, dessen schmale Ausdehnung von der Lanze 12 bis etwas über die Achse 10 reicht und dessen langgestreckte Ausdehnung quer hierzu verläuft.As shown in FIG. 4, the two outlet nozzles 12a, 12b are directed into the larger region of the pan 11 facing away from the peripheral wall of the pan 11 close to the lance and including the pan axis 10, so that there is an elongated washing spot characterized by the area 13, the narrow extent of which extends from the lance 12 to a little bit about the axis 10 and its elongated extent extends transversely to it.

Betrachtet man die Strömung auf Höhe der Linie 15, so stellt man die durch die Kurve 16 gekennzeichneten Verhältnisse fest. Charakteristisch ist hierbei auch die zentrale Einsattelung der Kurve 16, die in der um 90° gedrehten Ansicht gemäß Fig. 5 erkennbar ist. Allgemein läßt sich feststellen, daß sich bei der erfindungsgemäßen Ausführung die eingeblasenen pulverförmigen Reagenzien besser und schneller in der Schmelze 14 verteilen, wobei örtliche Überkonzentrationen vermieden werden.If you look at the flow at the level of line 15, you can see the conditions marked by curve 16. The central saddling of curve 16, which can be seen in the view rotated by 90 ° according to FIG. 5, is also characteristic here. In general, it can be stated that, in the embodiment according to the invention, the powdered reagents blown in are distributed better and faster in the melt 14, local over-concentrations being avoided.

Claims (3)

1. Apparatus for the introduction of reagents in powder form into a melting pan (11) containing a lance (12) which serves for the pneumatic delivery of the reagents and has outlet nozzles (12a, 12b) at its end located in the melt (14), characterised by the combination of the following features:
a) the lance (12) has two outlet nozzles (12a, 12b) which are offset with respect to one another by an angle of between 60 and 120°, with the angle bisector (20) intersecting the pan axis (10);
b) the lance (12) is arranged eccentrically with respect to the pan axis (10) and the two outlet nozzles (12a, 12b) are directed into the larger region of the pan (11) which faces away from the peripheral wall of the pan near the lance and encloses the pan axis (10).
2. Apparatus as claimed in claim 1, characterised in that the lance (12) is offset with respect to the pan axis (10) by 0.2 to 0.8 times, preferably 0.4 to 0.6 times the pan radius (R).
3. Apparatus as claimed in claim 1, characterised in that the two outlet nozzles (12a, 12b) are offset with respect to one another by an angle of between 80 and 100°.
EP89107446A 1988-05-20 1989-04-25 Device for introduction of powdery agents into a melting ladle Expired - Lifetime EP0342395B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89107446T ATE77840T1 (en) 1988-05-20 1989-04-25 DEVICE FOR LOADING POWDER REAGENTS INTO A MELTING LADLE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3817358 1988-05-20
DE3817358A DE3817358A1 (en) 1988-05-20 1988-05-20 DEVICE FOR ADDING POWDER-SHAPED REAGENTS INTO A MELTING PAN

Publications (2)

Publication Number Publication Date
EP0342395A1 EP0342395A1 (en) 1989-11-23
EP0342395B1 true EP0342395B1 (en) 1992-07-01

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ID=6354861

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EP89107446A Expired - Lifetime EP0342395B1 (en) 1988-05-20 1989-04-25 Device for introduction of powdery agents into a melting ladle

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US (1) US5062615A (en)
EP (1) EP0342395B1 (en)
AT (1) ATE77840T1 (en)
CA (1) CA1315102C (en)
DE (2) DE3817358A1 (en)
ES (1) ES2032624T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6434223B2 (en) 1985-07-10 2002-08-13 Ronald A. Katz Technology Licensing, L.P. Telephone interface call processing system with call selectivity

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4007390A1 (en) * 1990-03-08 1991-09-12 Krupp Polysius Ag METHOD AND DEVICE FOR ADDING POWDER-SHAPED REAGENTS INTO A Melting Pan

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AT224673B (en) * 1960-03-31 1962-12-10 Hoesch Ag Device for introducing fine-grain additives into metal melts
FR1271633A (en) * 1960-08-02 1961-09-15 Siderurgie Fse Inst Rech Device for treating liquid ferrous metals by blowing a gas through an eccentric lance
US3545960A (en) * 1967-04-25 1970-12-08 Union Carbide Corp Alloy addition process
US3627294A (en) * 1970-03-25 1971-12-14 Atlantic Richfield Co Protection sleeve for dip tubes
FI56857C (en) * 1977-06-21 1980-04-10 Outokumpu Oy SAFETY OVER ANORDNING FOR REFINING AVAILABLE WITH POWDER FORMATION FAST MATERIAL OCH / ELLER GAS
US4341554A (en) * 1981-04-02 1982-07-27 Jones & Laughlin Steel Incorporated Process for desulfurizing steel
JPS59150009A (en) * 1983-02-12 1984-08-28 Daido Steel Co Ltd Refining method of steel
DE3311617C1 (en) * 1983-03-30 1984-10-25 Messer Griesheim Gmbh, 6000 Frankfurt Method and device for rinsing a molten metal, in particular steel, in a ladle
US4481032A (en) * 1983-08-12 1984-11-06 Pfizer Inc. Process for adding calcium to a bath of molten ferrous material

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PATENT ABSTRACTS OF JAPAN Band 6, Nr.31 (C-92) (909), 24 Februar 1982; & JP-A-56150119 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6434223B2 (en) 1985-07-10 2002-08-13 Ronald A. Katz Technology Licensing, L.P. Telephone interface call processing system with call selectivity

Also Published As

Publication number Publication date
DE58901760D1 (en) 1992-08-06
CA1315102C (en) 1993-03-30
DE3817358A1 (en) 1989-11-30
ATE77840T1 (en) 1992-07-15
EP0342395A1 (en) 1989-11-23
US5062615A (en) 1991-11-05
ES2032624T3 (en) 1993-02-16

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