EP0355701B1 - Apparatus for controlling the exhaust gas temperature in a drum for preparing a mixture used in bitumen-coated products - Google Patents

Apparatus for controlling the exhaust gas temperature in a drum for preparing a mixture used in bitumen-coated products Download PDF

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Publication number
EP0355701B1
EP0355701B1 EP89115123A EP89115123A EP0355701B1 EP 0355701 B1 EP0355701 B1 EP 0355701B1 EP 89115123 A EP89115123 A EP 89115123A EP 89115123 A EP89115123 A EP 89115123A EP 0355701 B1 EP0355701 B1 EP 0355701B1
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EP
European Patent Office
Prior art keywords
drum
exhaust gas
burner
exhaust
extraction line
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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
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EP89115123A
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German (de)
French (fr)
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EP0355701A2 (en
EP0355701A3 (en
Inventor
Benno Dr. Ing. Stork
Ekkehard Dipl.-Ing. Papke
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Ats Asphalttechnik und Strassenbaugerate & Co KG GmbH
Hamburger Baustoffgesellschaft Mbh & Co KG
Original Assignee
Ats Asphalttechnik und Strassenbaugerate & Co KG GmbH
Hamburger Baustoffgesellschaft Mbh & Co KG
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Application filed by Ats Asphalttechnik und Strassenbaugerate & Co KG GmbH, Hamburger Baustoffgesellschaft Mbh & Co KG filed Critical Ats Asphalttechnik und Strassenbaugerate & Co KG GmbH
Priority to AT89115123T priority Critical patent/ATE86323T1/en
Publication of EP0355701A2 publication Critical patent/EP0355701A2/en
Publication of EP0355701A3 publication Critical patent/EP0355701A3/en
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Publication of EP0355701B1 publication Critical patent/EP0355701B1/en
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
    • E01C19/1027—Mixing in a rotary receptacle
    • E01C19/1036—Mixing in a rotary receptacle for in-plant recycling or for reprocessing, e.g. adapted to receive and reprocess an addition of salvaged material, adapted to reheat and remix cooled-down batches
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
    • E01C19/1063—Controlling the operations
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C2019/1081—Details not otherwise provided for
    • E01C2019/109—Mixing containers having a counter flow drum, i.e. the flow of material is opposite to the gas flow

Definitions

  • the invention relates to a device for regulating the exhaust gas temperature of a drum device provided for the preparation of mixed material in asphalt production and operating in countercurrent with a first exhaust gas suction line opening at its end wall opposite the burner and a part of the heating gases already at a distance from the burner withdrawing from the drum interior second exhaust gas suction line, the distance being smaller than the length of the drum device.
  • Such a drum device is known from DE-OS 29 14 286, in which, however, no device for regulating the exhaust gas temperature is provided, rather the second exhaust gas suction line is only used to at least partially remove the hot exhaust gases generated by the burner in the front section of the drum device, so that in the rear section of the drum device the heated mineral solid material can be coated with liquid fresh bitumen and this is not ignited by excessively high temperatures of the heating gases, it being provided that the heating gases drawn off by the second exhaust gas extraction line may be directly or indirectly for further heating of the then can be reused with bitumen-coated mineral solid material in the rear area of the drum device.
  • the two exhaust-gas extraction lines are each guided separately through appropriate separators and exhaust doors and only then fed to a common exhaust-gas extraction, with no throttling or regulating elements being provided in the respective exhaust-gas extraction lines, which enable the exhaust-gas temperature of the entire drum device to be regulated.
  • a drying drum for road construction materials which likewise does not have a concentrically arranged inside the drying drum and extends at a distance from the burner to the end wall opposite the burner and is led out through it, but a telescopic two-part that Insert tube surrounding the burner flame, which is to be referred to as a flame protection tube and is intended to optionally cover the burner flame, as a result of which the flame can act directly on the rock material to be heated in a partial area of the drying drum, but on the other hand the burner flame is shielded by pushing on the movable section and so that only indirect heating of the rock material can take place.
  • this drying drum is only intended to be able to dry both rock material that tolerates direct contact with the flame and also one that is able to withstand direct contact with the flame must be protected with the jet of fire, so it is about controlling the effect of heat on the material to be dried and differently sensitive to heat.
  • the invention is based on a counter-current drum device in which the material to be heated is conveyed through the drum in counter-current to the heating gases.
  • the material is first introduced into the interior at the end opposite the burner of the drum device and is thrown off or distributed by internals arranged on the inner wall of the drum device and designed as trickle blades for exchanging the heat with the heating gases over the cross section of the drum device and in the direction of the Brenner promoted.
  • Such known drum devices are equipped with a suction housing provided on the end opposite the burner.
  • the exhaust gas temperature in this suction housing is influenced on the one hand by the amount of material in the drum device and on the other hand by the intensity of the material veil caused by the internals.
  • the temperature can vary from 50 ° C to well over 400 ° C.
  • the exhaust gases from such a drum device are cleaned in downstream filter dedusting, a pre-separator being provided regularly between the drum device on the one hand and the downstream filter on the other hand, for separating the sand portions from the filler portion, the separation limit ideally being 0.09 mm grain size.
  • the filters provided in the filter dedusting are extremely sensitive to falling below dew point and overheating.
  • the exhaust gas can also fall below the dew point at temperatures up to 100 ° C.
  • the filter cloths used today are inexpensive, temperature-resistant up to 140 ° C and commercially available. Filter cloths that are resistant to higher temperatures are considerably more expensive and are also very sensitive to falling below the dew point.
  • the specialist circles have been trying to keep the exhaust gas temperature constant at around 90 ° C, but due to the aforementioned fluctuations in throughput and in material quality and quality, this is usually not possible.
  • loading belts which have already protruded into the interior of the drum device and which throw the material to be processed into the drum to different degrees have therefore been proposed. Due to the reduced length of the heat exchange zone, regulation of the Exhaust temperature can be reached. The success of a change in the material flow has so far been unsatisfactory.
  • Such counter-current drum devices are also used in asphalt preparation plants which work with two parallel-working drum devices, in which the second drum device is a co-operating drum.
  • this drum either broken up asphalt material, also known as asphalt granulate, is gently processed, which is then mixed in a downstream third mixing device, for example designed as a compulsory mixer, with the new material heated in the first drum device and processed into the final asphalt mixture or from the first The heated new material transferred to the asphalt mix is transferred with fresh bitumen.
  • the object of the present invention is to provide a device for controlling the exhaust gas temperature of a counter-current drum device which does not influence the material flow but the exhaust gas extraction and thereby allows the exhaust gas temperature in the downstream filters, but in particular in one with two working in parallel Processing equipment equipped with drum devices specifically to control or control the temperature of the asphalt granulate in the downstream DC drum, in which case the arrangement of a pre-separator for separating the sand components from the filler component can be omitted.
  • This design and arrangement of the second exhaust gas extraction line according to the invention ensures that the temperature conditions inside the drum interior on the one hand and in the exhaust gas discharge and thus the downstream devices (filters or drums) on the other hand can be regulated individually, without the material flow through openings in the central region of the inner wall of the drum device being impaired becomes. It is also essential, however, that this second exhaust gas extraction line removes the gases from the core area of the drum device, because there they are much hotter than in the wall area of the drum device, in which the rock material is also located.
  • the length of the second exhaust gas extraction line or the distance of its inlet opening from the burner can advantageously be changed.
  • this configuration of the second exhaust gas extraction line it is possible to control the temperature effect of the burner flame on the rock material in this area, depending on the sensitivity of the material to be heated and at the same time the temperature of the gas to be removed and fed to the downstream devices, regardless of the burner output set
  • two control options for the temperature in the downstream devices are created that are independent of one another.
  • the first and second exhaust gas suction lines advantageously open together into a second drum device, this second drum device being designed as a drum operating in direct current.
  • This design ensures that, on the one hand, the temperature-adjustable exhaust gases from the first drum device can be used in an energy-saving manner in the downstream further drum device and, on the other hand, that the further drum device works as a pre-separator for the sand content in the filler material and this portion is separated at the end of this drum and can be fed back to the mixing process separately.
  • This drum replaces the pre-separator that is usually installed in front of a filter.
  • the device for regulating the exhaust gas temperature is arranged in a drum device 1 provided for the preparation of mixed material in the production of asphalt, which is designed as a drum 2 operating in countercurrent.
  • the material required for the asphalt production for example new material without bitumen contents etc., is introduced into the interior 4 of the drum 2 via inlet openings 3 provided in the drum 2 and, as a result of the rotation of the drum 2, of scoop-shaped arranged on the inner wall 5 of the drum 2 Baffles 6 in the direction of the outlet openings 8 provided at the end of the drum in the vicinity of the burner 7 arranged there, the scoop-shaped baffles 6, depending on their design, the material to be processed either over the entire cross section of the interior 4 of the drum 2 or over a portion thereof to distribute.
  • an exhaust gas outlet 11 is provided, to which a first exhaust gas suction line 12 is connected and which is connected via throttle valves 13 to an exhaust gas exhaust 14 which, for example, via a suction fan 15 to filter systems (not shown) and / or forwards a further drum device.
  • a second exhaust gas extraction line 16 is fixed concentrically in the interior 4 of the drum 2 by means of corresponding holding devices 17, the inlet opening 18 of which is arranged at a distance A from the outlet of the burner flame 19 from the burner 7.
  • This second exhaust gas extraction line 16 is likewise passed concentrically through the exhaust gas outlet 11 arranged in the end wall 10 and ends in the vicinity of the throttle valves 13 of the first exhaust gas extraction line 12 via a further throttle valve 20 in the exhaust gas exhaust 14.
  • the throttle valves 13 and 20 can be adjustable depending on one another, furthermore it can be provided that the distance A between the burner flame 19 emerging from the burner 7 on the one hand and the inlet opening 18 of the second exhaust gas extraction line 16 is variable, with either the burner 7 in is designed to be displaceable in the axial longitudinal direction in the end wall 9 of the drum 2 or the length of the second exhaust gas extraction line 16 projecting into the interior 4 of the drum 2 can be varied, for example in the manner of a telescope.
  • An advantageous positioning of the inlet opening 18 of the second exhaust gas extraction line 16 lies at the end of the burnout zone of the burner flame 19, starting from an advantageous setting of the burner 7 or the burner flame 19. At this point, the flame gases are still particularly hot, ie at a temperature of approx. 600 - 1,000 ° C.
  • the extraction of these hot gases through the second exhaust gas extraction line 16 enables a temperature to be reached both in the area of the interior 4 of the drum 2, where the second exhaust gas extraction line 16 is arranged, and in the exhaust gas exhaust 14, which is referred to as the mixing temperature which can be regulated as required can be.
  • the throttle valves 13 of the first exhaust gas suction line 12 remain fully open.
  • the second (inner) exhaust gas suction line 16 is only partially opened via its throttle valve 20.
  • the desired drum exhaust gas temperature can be set specifically for a specific operating situation by the blade-shaped internals 6. In the case of a material that is more fine-grained, the exhaust gas temperature would then be reduced, based on the same throughput rates. Since this would only disrupt the operating sequence, the suction power can be increased by the second exhaust gas suction line 16 for compensation. Alternatively, the temperature in the exhaust gas can rise if the rock is very coarse. At the same throughput, the amount of air extracted through the second exhaust extraction line 16 would then be reduced to reduce the drum exhaust gas temperature. This would achieve the maximum possible heat exchange performance with the flap completely closed. Through this reserve In the heat exchange capacity of the device, in conjunction with the controllable amount of air, the exhaust gas temperature can be kept constant, which is particularly important for any downstream filters.
  • this device can also be used to control the temperature of the material, e.g. Asphalt granulate, necessary gas can be controlled.
  • An important advantage of the device described above is that no exhaust gas outlet openings are to be arranged in the inner wall 5 in the central region of the drum 2, they only adversely affect the material flow of the material to be processed, i.e. at these points, the material can build up, bake etc. These disadvantages are avoided by the arrangement of a concentrically arranged second exhaust gas extraction line 16 in the interior 4 of the drum as described above.

Description

Die Erfindung betrifft eine Vorrichtung zur Regelung der Abgastemperatur einer für die Aufbereitung von Mischgut bei der Asphaltherstellung vorgesehenen und im Gegenstrom arbeitenden Trommelvorrichtung mit einer, an ihrer dem Brenner gegenüberliegenden Stirnwand einmündenden ersten Abgasabsaugleitung und einer, einen Teil der Heizgase bereits in einem Abstand von dem Brenner aus dem Trommelinnenraum abziehenden zweiten Abgasabsaugleitung, wobei der Abstand kleiner als die Länge der Trommelvorrichtung ist.The invention relates to a device for regulating the exhaust gas temperature of a drum device provided for the preparation of mixed material in asphalt production and operating in countercurrent with a first exhaust gas suction line opening at its end wall opposite the burner and a part of the heating gases already at a distance from the burner withdrawing from the drum interior second exhaust gas suction line, the distance being smaller than the length of the drum device.

Eine solche Trommelvorrichtung ist aus der DE-OS 29 14 286 bekannt, bei welcher jedoch keine Vorrichtung zur Regelung der Abgastemperatur vorgesehen ist, vielmehr die zweite Abgasabsaugleitung lediglich dazu dient, die im vorderen Abschnitt der Trommelvorrichtung durch den Brenner erzeugten heißen Abgase zumindest teilweise abzuziehen, so daß im hinteren Abschnitt der Trommelvorrichtung das erhitzte mineralische Feststoffmaterial mit flüssigem Frischbitumen ummantelt werden kann und dieses nicht durch zu hohe Temperaturen der Heizgase entflammt wird, wobei vorgesehen ist, daß die durch die zweite Abgasabsaugleitung abgezogenen Heizgase gegebenenfalls direkt oder indirekt zur weiteren Erhitzung des dann mit Bitumen ummantelten mineralischen Feststoffmaterials im hinteren Bereich der Trommelvorrichtung wieder verwendet werden können. Die beiden Abgasabsaugleitungen werden jeweils getrennt durch entsprechende Abscheider und Exhaustoren geführt und erst danach einem gemeinsamen Abgasabzug zugeführt, wobei keine Drossel- bzw. Regelorgane in den jeweiligen Abgasabsaugleitungen vorgesehen sind, welche eine Regelung der Abgastemperatur der gesamten Trommelvorrichtung ermöglichen.Such a drum device is known from DE-OS 29 14 286, in which, however, no device for regulating the exhaust gas temperature is provided, rather the second exhaust gas suction line is only used to at least partially remove the hot exhaust gases generated by the burner in the front section of the drum device, so that in the rear section of the drum device the heated mineral solid material can be coated with liquid fresh bitumen and this is not ignited by excessively high temperatures of the heating gases, it being provided that the heating gases drawn off by the second exhaust gas extraction line may be directly or indirectly for further heating of the then can be reused with bitumen-coated mineral solid material in the rear area of the drum device. The two exhaust-gas extraction lines are each guided separately through appropriate separators and exhaust doors and only then fed to a common exhaust-gas extraction, with no throttling or regulating elements being provided in the respective exhaust-gas extraction lines, which enable the exhaust-gas temperature of the entire drum device to be regulated.

Aus der DE-PS 528 655 ist eine Trockentrommel für Straßenbaustoffe bekannt, welche ebenfalls keine konzentrisch innnerhalb der Trockentrommel angeordnete und sich in einem Abstand von dem Brenner zur dem Brenner gegenüberliegenden Stirnwand erstreckt und durch diese hinausgeführt ist, sondern ein teleskopförmig ausgebildetes, zweiteiliges, die Brennerflamme umgebendes Einsatzrohr, welches als Flammschutzrohr zu bezeichnen und dazu vorgesehen ist, die Brennerflamme wahlweise abzudecken, wodurch einmal die Flamme in einem Teilbereich der Trockentrommel unmittelbar auf das zu erhitzende Gesteinsmaterial einwirken kann, andererseits aber durch das Aufschieben des beweglichen Teilstückes die Brennerflamme abgeschirmt wird und damit nur eine indirekte Beheizung des Gesteinsmaterials erfolgen kann.From DE-PS 528 655 a drying drum for road construction materials is known, which likewise does not have a concentrically arranged inside the drying drum and extends at a distance from the burner to the end wall opposite the burner and is led out through it, but a telescopic two-part that Insert tube surrounding the burner flame, which is to be referred to as a flame protection tube and is intended to optionally cover the burner flame, as a result of which the flame can act directly on the rock material to be heated in a partial area of the drying drum, but on the other hand the burner flame is shielded by pushing on the movable section and so that only indirect heating of the rock material can take place.

Mit dieser bekannten Trommelvorrichtung ist es nicht möglich, die Abgastemperatur der gesamten Trommelvorrichtung zu steuern, vielmehr ist diese Trockentrommel nur dafür vorgesehen, einerseits sowohl Gesteinsmaterial trocknen zu können, welches eine unmittelbare Berührung mit der Flamme verträgt, als auch solches, welches vor einer unmittelbaren Berührung mit dem Feuerstrahl geschützt werden muß, es geht dort also um die Steuerung der Hitzeeinwirkung auf das zu trocknende und unterschiedlich hitzeempfindliche Material.With this known drum device, it is not possible to control the exhaust gas temperature of the entire drum device, rather this drying drum is only intended to be able to dry both rock material that tolerates direct contact with the flame and also one that is able to withstand direct contact with the flame must be protected with the jet of fire, so it is about controlling the effect of heat on the material to be dried and differently sensitive to heat.

Im Gegensatz zu der aus der DE-OS 29 14 286 bekannten Trommelvorrichtung geht nun die Erfindung von einer im Gegenstrom arbeitenden Trommelvorrichtung aus, bei welcher das zu erwärmende Material im Gegenstrom zu den Heizgasen durch die Trommel hindurch gefördert wird. Hierbei wird zunächst das Material an dem dem Brenner der Trommelvorrichtung gegenüberliegenden Ende in den Innenraum eingebracht und von auf der Innenwandung der Trommelvorrichtung angeordneten und als Rieselschaufeln ausgebildeten Einbauten zum Austausch der Wärme mit den Heizgasen über den Querschnitt der Trommelvorrichtung abgeworfen bzw. verteilt und in Richtung des Brenners gefördert. Im Bereich der stärksten Flammenstrahlung ist im Gegensatz zur DE-PS 528 655 kein die Brennerflamme abdeckendes Flammschutzrohr vorgesehen, dies ist auch nicht erforderlich, denn das Material wird vielmehr von Einbauten gefördert, welche so ausgebildet sind, daß sie einerseits den Ausbrand der Flamme möglichst wenig hindern und andererseits das Material aus dem unmittelbaren Ausbrandbereich der Flamme heraushalten und an den Trommelwandungen entlang fördern.In contrast to the drum device known from DE-OS 29 14 286, the invention is based on a counter-current drum device in which the material to be heated is conveyed through the drum in counter-current to the heating gases. In this case, the material is first introduced into the interior at the end opposite the burner of the drum device and is thrown off or distributed by internals arranged on the inner wall of the drum device and designed as trickle blades for exchanging the heat with the heating gases over the cross section of the drum device and in the direction of the Brenner promoted. In the area of the strongest flame radiation, in contrast to DE-PS 528 655, no flame protection tube covering the burner flame is provided, this is not necessary either, because the material is rather promoted by internals which are designed so that on the one hand they burn out the Prevent the flame as little as possible and on the other hand keep the material out of the immediate burnout area of the flame and convey it along the drum walls.

Solche bekannten Trommelvorrichtungen sind mit einem an dem dem Brenner gegenüberliegenden Ende vorgesehenen Absauggehäuse ausgerüstet. Die Abgastemperatur in diesem Absauggehäuse wird beeinflußt durch einerseits die Materialmenge in der Trommelvorrichtung und andererseits durch die Intensität des Materialschleiers, hervorgerufen durch die Einbauten. Je nach Durchsatzleistung und Materialqualität kann die Temperatur von 50°C bis weit über 400°C schwanken. Im Regelfall ist es durch Anpassung der Trommeleinbauten möglich, den Schwankungsbereich auf eine Abgastemperatur von zirka 90°C +/- 30° einzustellen.Such known drum devices are equipped with a suction housing provided on the end opposite the burner. The exhaust gas temperature in this suction housing is influenced on the one hand by the amount of material in the drum device and on the other hand by the intensity of the material veil caused by the internals. Depending on the throughput and material quality, the temperature can vary from 50 ° C to well over 400 ° C. As a rule, it is possible to adjust the fluctuation range to an exhaust gas temperature of around 90 ° C +/- 30 ° by adapting the drum internals.

Die Abgase einer solchen Trommelvorrichtung werden in nachgeschalteten Filterentstaubungen gereinigt, wobei regelmäßig zwischen der Trommelvorrichtung einerseits und dem nachgeschalteten Filter andererseits ein Vorabscheider zur Trennung der Sandanteile vom Fülleranteil vorgesehen ist, wobei die Trenngrenze im Idealfalle bei 0,09 mm Korngröße liegt.The exhaust gases from such a drum device are cleaned in downstream filter dedusting, a pre-separator being provided regularly between the drum device on the one hand and the downstream filter on the other hand, for separating the sand portions from the filler portion, the separation limit ideally being 0.09 mm grain size.

Die in den Filterentstaubungen vorgesehenen Filter sind äußerst empfindlich gegen Taupunktunterschreitungen und Übertemperaturen. Taupunktunterschreitungen können auch bei Temperaturen bis 100°C im Abgas eintreten. Die heutzutage eingesetzten Filtertücher sind kostengünstig, bis 140°C temperaturbeständig und handelsüblich. Gegen höhere Temperaturen beständige Filtertücher sind wesentlich teurer und darüber hinaus auch sehr empfindlich gegen Taupunktunterschreitungen. Seit langem bemühen sich die Fachkreise, die Abgastemperatur bei zirka 90°C konstant einzustellen, wegen der vorerwähnten Schwankungen in der Durchsatzleistung und in der Materialqualität bzw. -beschaffenheit gelingt dies aber im Regelfalle nicht. Zur Beeinflussung der Abgastemperatur wurden deshalb beispielsweise bereits in das Innere der Trommelvorrichtung einstehende Beschickungsbänder vorgeschlagen, die das aufzubereitende Material unterschiedlich weit in die Trommel einwerfen. Durch die verminderte Länge der Wärmeaustauschzone sollte dabei eine Regelung der Abgastemperatur erreicht werden. Die Erfolge durch eine Änderung im Materialstrom sind jedoch bisher unbefriedigend.The filters provided in the filter dedusting are extremely sensitive to falling below dew point and overheating. The exhaust gas can also fall below the dew point at temperatures up to 100 ° C. The filter cloths used today are inexpensive, temperature-resistant up to 140 ° C and commercially available. Filter cloths that are resistant to higher temperatures are considerably more expensive and are also very sensitive to falling below the dew point. For a long time, the specialist circles have been trying to keep the exhaust gas temperature constant at around 90 ° C, but due to the aforementioned fluctuations in throughput and in material quality and quality, this is usually not possible. To influence the exhaust gas temperature, for example, loading belts which have already protruded into the interior of the drum device and which throw the material to be processed into the drum to different degrees have therefore been proposed. Due to the reduced length of the heat exchange zone, regulation of the Exhaust temperature can be reached. The success of a change in the material flow has so far been unsatisfactory.

Solche im Gegenstrom arbeitenden Trommelvorrichtungen, von welcher die Erfindung ausgeht, finden aber auch bei Asphaltaufbereitungsanlagen Verwendung, die mit zwei parallel arbeitenden Trommelvorrichtungen arbeiten, bei welchen die zweite Trommelvorrichtung eine im Gleichstrom arbeitende Trommel ist. In dieser Trommel wird entweder aufgebrochenes Altasphaltmaterial, auch Asphaltgranulat genannt, schonend aufbereitet, welches dann in einer nachgeschalteten dritten, beispielsweise als Zwangsmischer ausgebildeten Mischvorrichtung mit dem in der ersten Trommelvorrichtung erwärmten Neu-Material vermischt und zu dem endgültigen Asphaltmischgut aufbereitet wird oder das aus der ersten Trommelvorrichtung übergeleitete erwärmte Neu-Material mit Frischbitumen zum Asphaltmischgut aufbereitet.Such counter-current drum devices, from which the invention is based, are also used in asphalt preparation plants which work with two parallel-working drum devices, in which the second drum device is a co-operating drum. In this drum either broken up asphalt material, also known as asphalt granulate, is gently processed, which is then mixed in a downstream third mixing device, for example designed as a compulsory mixer, with the new material heated in the first drum device and processed into the final asphalt mixture or from the first The heated new material transferred to the asphalt mix is transferred with fresh bitumen.

Aufgabe der vorliegenden Erfindung ist es nun, eine Vorrichtung zur Regelung der Abgastemperatur einer im Gegenstrom arbeitenden Trommelvorrichtung zu schaffen, welche nicht den Materialdurchfluß, sondern die Abgasentnahme beeinflußt und dadurch gestattet, die Abgastemperatur in den nachgeschalteten Filtern, insbesondere aber bei einer mit zwei parallel arbeitenden Trommelvorrichtungen ausgestatteten Aufbereitungsanlage die Temperatur des Asphaltgranulats in der nachgeschalteten Gleichstromtrommel gezielt zu kontrollieren bzw. zu steuern, wobei dann die Anordnung eines Vorabscheiders zur Trennung der Sandanteile vom Fülleranteil entfallen kann.The object of the present invention is to provide a device for controlling the exhaust gas temperature of a counter-current drum device which does not influence the material flow but the exhaust gas extraction and thereby allows the exhaust gas temperature in the downstream filters, but in particular in one with two working in parallel Processing equipment equipped with drum devices specifically to control or control the temperature of the asphalt granulate in the downstream DC drum, in which case the arrangement of a pre-separator for separating the sand components from the filler component can be omitted.

Diese Aufgabe wird bei einer Vorrichtung nach dem Oberbegriff durch die im kennzeichnenden Teil des Hauptanspruches augegebenen Merkmale gelöst.This object is achieved in a device according to the preamble by the features stated in the characterizing part of the main claim.

Diese erfindungsgemäße Ausgestaltung und Anordnung der zweiten Abgasabsaugleitung gewährleistet, daß die Temperaturverhältnisse innerhalb des Trommelinnenraumes einerseits und in dem Abgasabzug und damit den nachgeschalteten Vorrichtungen (Filter oder Trommeln) andererseits individuell geregelt werden können, ohne daß der Materialfluß durch Öffnungen im Mittelbereich der Innenwandung der Trommelvorrichtung beeinträchtigt wird. Wesentlich ist aber auch, daß diese zweite Abgasabsaugleitung die Gase aus dem Kernbereich der Trommelvorrichtung entnimmt, denn dort sind sie wesentlich heißer als im Wandungsbereich der Trommelvorrichtung, in welchem sich auch das Gesteinsmaterial befindet.This design and arrangement of the second exhaust gas extraction line according to the invention ensures that the temperature conditions inside the drum interior on the one hand and in the exhaust gas discharge and thus the downstream devices (filters or drums) on the other hand can be regulated individually, without the material flow through openings in the central region of the inner wall of the drum device being impaired becomes. It is also essential, however, that this second exhaust gas extraction line removes the gases from the core area of the drum device, because there they are much hotter than in the wall area of the drum device, in which the rock material is also located.

Vorteilhaft ist die zweite Abgasabsaugleitung in ihrer Länge bzw. der Abstand ihrer Einlaßöffnung von dem Brenner veränderbar.
Mit dieser Ausbildung der zweiten Abgasabsaugleitung ist es möglich, unabhängig von der eingestellten Brennerleistung die Temperatureinwirkung der Brennerflamme auf das Gesteinsmaterial in diesem Bereich in Abhängigkeit der Empfindlichkeit des zu erwärmenden Materials und gleichzeitig die Temperatur des zu entnehmenden und den nachgeschalteten Vorrichtungen zuzuführenden Gases zu steuern, es werden also in Verbindung mit der freien Regelung der Brennerflamme zwei Regelungsmöglichkeiten für die Temperatur in den nachgeschalteten Vorrichtungen geschaffen, die unabhängig voneinander sind.The length of the second exhaust gas extraction line or the distance of its inlet opening from the burner can advantageously be changed.
With this configuration of the second exhaust gas extraction line, it is possible to control the temperature effect of the burner flame on the rock material in this area, depending on the sensitivity of the material to be heated and at the same time the temperature of the gas to be removed and fed to the downstream devices, regardless of the burner output set In connection with the free control of the burner flame, two control options for the temperature in the downstream devices are created that are independent of one another.

Vorteilhaft münden erste und zweite Abgasabsaugleitung gemeinsam in eine zweite Trommelvorrichtung ein, wobei diese zweite Trommelvorrichtung als eine im Gleichstrom arbeitende Trommel ausgebildet ist.
Diese Ausbildung gewährleistet, daß zum einen die temperaturmäßig einstellbaren Abgase aus der ersten Trommelvorrichtung in der nachgeschalteten weiteren Trommelvorrichtung energiesparend verwertet werden können und zum anderen, daß die weitere Trommelvorrichtung als Vorabscheider für den Sandanteil im Füllermaterial arbeitet und dieser Anteil am Ende dieser Trommel abgeschieden und separat dem Mischprozeß wieder zugeführt werden kann. Dadurch ersetzt diese Trommel den üblicherweise vor einem Filter eingebauten Vorabscheider.The first and second exhaust gas suction lines advantageously open together into a second drum device, this second drum device being designed as a drum operating in direct current.
This design ensures that, on the one hand, the temperature-adjustable exhaust gases from the first drum device can be used in an energy-saving manner in the downstream further drum device and, on the other hand, that the further drum device works as a pre-separator for the sand content in the filler material and this portion is separated at the end of this drum and can be fed back to the mixing process separately. This drum replaces the pre-separator that is usually installed in front of a filter.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der einzigen Zeichnung beschrieben.An embodiment of the invention is described below with reference to the single drawing.

Die Vorrichtung zur Regelung der Abgastemperatur ist in einer für die Aufbereitung von Mischgut bei der Aspaltherstellung vorgesehenen Trommelvorrichtung 1 angeordnet, welche als im Gegenstrom arbeitende Trommel 2 ausgebildet ist. Das für die Asphaltherstellung benötigte Material, beispielsweise Neumaterial ohne Anteile von Bitumen etc., wird über in der Trommel 2 vorgesehene Einlaßöffnungen 3 in den Innenraum 4 der Trommel 2 eingebracht und infolge der Drehung der Trommel 2 von an der Innenwandung 5 der Trommel 2 angeordneten schaufelförmigen Einbauten 6 in Richtung auf die am Trommelende in Nähe des dort angeordneten Brenners 7 vorgesehenen Auslaßöffnungen 8 hingefördert, wobei die schaufelförmigen Einbauten 6, je nach ihrer Ausgestaltung, das aufzubereitende Material entweder über den gesamten Querschnitt des Innenraumes 4 der Trommel 2 oder über einen Teilbereich desselben verteilen.The device for regulating the exhaust gas temperature is arranged in a drum device 1 provided for the preparation of mixed material in the production of asphalt, which is designed as a drum 2 operating in countercurrent. The material required for the asphalt production, for example new material without bitumen contents etc., is introduced into the interior 4 of the drum 2 via inlet openings 3 provided in the drum 2 and, as a result of the rotation of the drum 2, of scoop-shaped arranged on the inner wall 5 of the drum 2 Baffles 6 in the direction of the outlet openings 8 provided at the end of the drum in the vicinity of the burner 7 arranged there, the scoop-shaped baffles 6, depending on their design, the material to be processed either over the entire cross section of the interior 4 of the drum 2 or over a portion thereof to distribute.

In der der den Brenner 7 enthaltenden Stirnwand 9 gegenüberliegenden Stirnwand 10 ist ein Abgasauslaß 11 vorgesehen, an welchen sich eine erst Abgasabsaugleitung 12 anschließt und welche über Drosselklappen 13 mit einem Abgasabzug 14 verbunden ist, welcher die Abgase beispielsweise über einen Absaugventilator 15 an nicht dargestellte Filteranlagen und/oder eine nachgeschaltete weitere Trommelvorrichtung weiterleitet.In the end wall 10 opposite the burner 7 containing the end wall 9, an exhaust gas outlet 11 is provided, to which a first exhaust gas suction line 12 is connected and which is connected via throttle valves 13 to an exhaust gas exhaust 14 which, for example, via a suction fan 15 to filter systems (not shown) and / or forwards a further drum device.

Konzentrisch im Innenraum 4 der Trommel 2 ist eine zweite Abgasabsaugleitung 16 mittels entsprechender Haltevorrichtungen 17 befestigt, deren Einlaßöffnung 18 in einem Abstand A von dem Austritt der Brennerflamme 19 aus dem Brenner 7 angeordnet ist. Diese zweite Abgasabsaugleitung 16 ist ebenfalls konzentrisch durch den in der Stirnwand 10 angeordneten Abgasauslaß 11 hindurchgeführt und endet in der Nähe der Drosselklappen 13 der ersten Abgasabsaugleitung 12 über eine weitere Drosselklappe 20 in den Abgasabzug 14.A second exhaust gas extraction line 16 is fixed concentrically in the interior 4 of the drum 2 by means of corresponding holding devices 17, the inlet opening 18 of which is arranged at a distance A from the outlet of the burner flame 19 from the burner 7. This second exhaust gas extraction line 16 is likewise passed concentrically through the exhaust gas outlet 11 arranged in the end wall 10 and ends in the vicinity of the throttle valves 13 of the first exhaust gas extraction line 12 via a further throttle valve 20 in the exhaust gas exhaust 14.

Hierbei können die Drosselklappen 13 bzw. 20 in Abhängigkeit voneinander verstellbar sein, weiters kann vorgesehen werden, daß der Abstand A zwischen Austritt der Brennerflamme 19 aus dem Brenner 7 einerseits und der Einlaßöffnung 18 der zweiten Abgasabsaugleitung 16 variabel ist, wobei entweder der Brenner 7 in axialer Längsrichtung in der Stirnwand 9 der Trommel 2 verschieblich ausgebildet ist oder die zweite Abgasabsaugleitung 16 in ihrer in den Innenraum 4 der Trommel 2 hineinragenden Länge variierbar ist, beispielsweise nach Art eines Teleskopes.The throttle valves 13 and 20 can be adjustable depending on one another, furthermore it can be provided that the distance A between the burner flame 19 emerging from the burner 7 on the one hand and the inlet opening 18 of the second exhaust gas extraction line 16 is variable, with either the burner 7 in is designed to be displaceable in the axial longitudinal direction in the end wall 9 of the drum 2 or the length of the second exhaust gas extraction line 16 projecting into the interior 4 of the drum 2 can be varied, for example in the manner of a telescope.

Eine vorteilhafte Positionierung der Einlaßöffnung 18 der zweiten Abgasabsaugleitung 16 liegt am Ende der Ausbrandzone der Brennerflamme 19, ausgehend von einer vorteilhaften Einstellung des Brenners 7 bzw. der Brennerflamme 19. An dieser Stelle sind die Flammengase noch besonders heiß, d.h. mit einer Temperatur von ca. 600 - 1.000°C. Durch die Absaugung dieser heißen Gase durch die zweite Abgasabsaugleitung 16 wird ermöglicht, sowohl im Bereich des Innenraumes 4 der Trommel 2, wo die zweite Abgasabsaugleitung 16 angeordnet ist, als auch im Abgasabzug 14 eine Temperatur zu erreichen, welche jeweils als nach Bedarf regelbare Mischtemperatur bezeichnet werden kann. Bei Normalbetrieb bleiben die Drosselklappen 13 der ersten Abgasabsaugleitung 12 voll geöffnet. Die zweite (innere) Abgasabsaugleitung 16 wird über ihre Drosselklappe 20 nur teilweise geöffnet. Die gewünschte Trommelabgastemperatur kann durch die schaufelförmigen Einbauten 6 für eine bestimmte Betriebssituation gezielt eingestellt werden. Bei einem Material, welches feinkörniger ist, würde sich nun, ausgehend von gleichen Durchsatzleistungen, die Abgastemperatur reduzieren. Da dies nur den Betriebsablauf stören würde, kann zum Ausgleich die Absaugleistung durch die zweite Abgasabsaugleitung 16 erhöht werden. Alternativ dazu kann bei sehr grobem Gestein die Temperatur im Abgas ansteigen. Bei gleicher Durchsatzleistung würde dann zur Reduzierung der Trommelabgastemperatur die durch die zweite Abgasabsaugleitung 16 abgesaugte Luftmenge reduziert. Hierdurch würde die maximal mögliche Wärmeaustauschleistung bei vollständig geschlossener Klappe erreicht werden. Durch diese Reserve in der Wärmeaustauschkapazität der Vorrichtung kann in Verbindung mit der regelbaren Luftmenge die Abgastemperatur konstant gehalten werden, was insbesondere für evtl. nachgeschaltete Filter von Bedeutung ist.An advantageous positioning of the inlet opening 18 of the second exhaust gas extraction line 16 lies at the end of the burnout zone of the burner flame 19, starting from an advantageous setting of the burner 7 or the burner flame 19. At this point, the flame gases are still particularly hot, ie at a temperature of approx. 600 - 1,000 ° C. The extraction of these hot gases through the second exhaust gas extraction line 16 enables a temperature to be reached both in the area of the interior 4 of the drum 2, where the second exhaust gas extraction line 16 is arranged, and in the exhaust gas exhaust 14, which is referred to as the mixing temperature which can be regulated as required can be. In normal operation, the throttle valves 13 of the first exhaust gas suction line 12 remain fully open. The second (inner) exhaust gas suction line 16 is only partially opened via its throttle valve 20. The desired drum exhaust gas temperature can be set specifically for a specific operating situation by the blade-shaped internals 6. In the case of a material that is more fine-grained, the exhaust gas temperature would then be reduced, based on the same throughput rates. Since this would only disrupt the operating sequence, the suction power can be increased by the second exhaust gas suction line 16 for compensation. Alternatively, the temperature in the exhaust gas can rise if the rock is very coarse. At the same throughput, the amount of air extracted through the second exhaust extraction line 16 would then be reduced to reduce the drum exhaust gas temperature. This would achieve the maximum possible heat exchange performance with the flap completely closed. Through this reserve In the heat exchange capacity of the device, in conjunction with the controllable amount of air, the exhaust gas temperature can be kept constant, which is particularly important for any downstream filters.

Nach der eingangs geschilderten zweiten Aufgabenstellung kann durch diese Vorrichtung auch die Temperatur des für die in einer nachgeschalteten und parallel arbeitenden Trommelvorrichtung erfolgende Aufbereitung des Materials, z.B. Asphaltgranulat, notwendigen Gases gesteuert werden.According to the second task described at the outset, this device can also be used to control the temperature of the material, e.g. Asphalt granulate, necessary gas can be controlled.

Ein wesentlicher Vorteil der vorbeschriebenen Vorrichtung liegt darin, daß keine Abgas-Austrittsöffnungen in der Innenwandung 5 im Mittelbereich der Trommel 2 anzuordnen sind, sie beeinflussen lediglich den Materialfluß des aufzubereitenden Materials nachteilig, d.h. an diesen Stellen kann sich das Material stauen, anbacken etc. Diese Nachteile werden durch die vorbeschriebene Anordnung einer konzentrisch angeordneten zweiten Abgasabsaugleitung 16 im Innenraum 4 der Trommel vermieden.An important advantage of the device described above is that no exhaust gas outlet openings are to be arranged in the inner wall 5 in the central region of the drum 2, they only adversely affect the material flow of the material to be processed, i.e. at these points, the material can build up, bake etc. These disadvantages are avoided by the arrangement of a concentrically arranged second exhaust gas extraction line 16 in the interior 4 of the drum as described above.

Claims (6)

  1. A device for controlling the exhaust gas temperature of a drum which is provided for preparing a mixture used in bitumen-coated products and has a first exhaust extraction line opening at its end wall opposite the burner and a second exhaust extraction line which already removes some of the heating gases from the interior of the drum at a distance from the burner, the distance being smaller than the length of the drum, characterised in that the drum is a drum (2) which operates on the countercurrent principle, in that the second exhaust extraction line (16) passes in the form of a tube through the end wall (10) opposite the burner (7), is arranged concentrically within the interior (4) of the drum and faces the burner flame (19) with its inlet opening (18) at a distance (A).
  2. A device according to claim 1, characterised in that the length of the second exhaust extraction line (16) or the distance (A) of its inlet opening (18) from the burner (7) is variable.
  3. A device according to claim 1, characterised in that the exhaust outlet (14) opens into a second drum.
  4. A device according to claim 3, characterised in that the second drum is designed as a drum which operates on the co-current principle.
  5. A device according to claim 1, characterised in that, after emerging from the end wall (10) of the drum (2) opposite the burner (7), the first and second exhaust extraction lines (12 and 16 respectively) are combined.
  6. A device according to claim 5, characterised in that the first and second exhaust extraction lines (12 and 16 respectively) are each equipped in the region of their combination with throttle valves (13 and 20 respectively).
EP89115123A 1988-08-22 1989-08-16 Apparatus for controlling the exhaust gas temperature in a drum for preparing a mixture used in bitumen-coated products Expired - Lifetime EP0355701B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89115123T ATE86323T1 (en) 1988-08-22 1989-08-16 DEVICE FOR ADJUSTING THE EXHAUST GAS TEMPERATURE IN DRUM DEVICES DESIGNED FOR THE PROCESSING OF MIX IN ASPHALIC MANUFACTURING.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3828425 1988-08-22
DE3828425A DE3828425A1 (en) 1988-08-22 1988-08-22 DEVICE FOR CONTROLLING THE EXHAUST GAS TEMPERATURE FOR THE TREATMENT OF MIXED MATERIAL PROVIDED IN THE ASPHALT MANUFACTURING DEVICE
DE8810609U DE8810609U1 (en) 1988-08-22 1988-08-22

Publications (3)

Publication Number Publication Date
EP0355701A2 EP0355701A2 (en) 1990-02-28
EP0355701A3 EP0355701A3 (en) 1990-10-10
EP0355701B1 true EP0355701B1 (en) 1993-03-03

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EP89115123A Expired - Lifetime EP0355701B1 (en) 1988-08-22 1989-08-16 Apparatus for controlling the exhaust gas temperature in a drum for preparing a mixture used in bitumen-coated products

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EP (1) EP0355701B1 (en)
DE (2) DE3828425A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9187855B2 (en) 2004-10-22 2015-11-17 Whirlpool Corporation Modular laundry system with work surface
US11851221B2 (en) 2022-04-21 2023-12-26 Curium Us Llc Systems and methods for producing a radioactive drug product using a dispensing unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2956125B1 (en) * 2010-02-11 2012-03-16 Famaro INSTALLATION FOR THE PRODUCTION OF BITUMINOUS COATED PRODUCTS.

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Publication number Priority date Publication date Assignee Title
DE528655C (en) * 1931-07-02 Albrecht Reiser Fa Drying drum for road building materials
GB1443424A (en) * 1972-10-13 1976-07-21 Redland Roadstone Ltd Method and apparatus for production of coated roadstone
DE2914286C2 (en) * 1979-04-09 1982-03-25 Wibau Industrie und Verwaltung GmbH, 6466 Gründau Process for the preparation of bituminous mix in a drum mixer fired in cocurrent with a suction system connected in the end area of the drum mixer
US4477250A (en) * 1983-03-07 1984-10-16 Mechtron International Corporation Asphalt recycle plant and method
DE3414365A1 (en) * 1984-04-16 1985-10-24 Erich Dipl.-Ing. 8000 München Schambeck DEVICE FOR TREATING BITUMINOESE MIXED MATERIAL, IN PARTICULAR ROAD CONSTRUCTION ASPHALT
DE3441382A1 (en) * 1984-11-13 1986-05-22 Deutsche Asphalt Gmbh, 6000 Frankfurt METHOD AND DEVICE FOR PROCESSING ASPHALT

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9187855B2 (en) 2004-10-22 2015-11-17 Whirlpool Corporation Modular laundry system with work surface
US9546442B2 (en) 2004-10-22 2017-01-17 Whirlpool Corporation Modular laundry system and laundry module
US11851221B2 (en) 2022-04-21 2023-12-26 Curium Us Llc Systems and methods for producing a radioactive drug product using a dispensing unit

Also Published As

Publication number Publication date
DE8810609U1 (en) 1988-10-27
EP0355701A2 (en) 1990-02-28
EP0355701A3 (en) 1990-10-10
DE3828425A1 (en) 1990-03-01

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