EP2558807A1 - Method for pre-heating annealing material in a hood-type annealing system - Google Patents

Method for pre-heating annealing material in a hood-type annealing system

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Publication number
EP2558807A1
EP2558807A1 EP11719752A EP11719752A EP2558807A1 EP 2558807 A1 EP2558807 A1 EP 2558807A1 EP 11719752 A EP11719752 A EP 11719752A EP 11719752 A EP11719752 A EP 11719752A EP 2558807 A1 EP2558807 A1 EP 2558807A1
Authority
EP
European Patent Office
Prior art keywords
protective
heat
annealing
hood
protective hood
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.)
Granted
Application number
EP11719752A
Other languages
German (de)
French (fr)
Other versions
EP2558807B1 (en
EP2558807B8 (en
Inventor
Robert Ebner
Andreas Sauschlager
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.)
Ebner Industrieofenbau GmbH
Original Assignee
Ebner Industrieofenbau GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Ebner Industrieofenbau GmbH filed Critical Ebner Industrieofenbau GmbH
Priority to PL11719752T priority Critical patent/PL2558807T3/en
Publication of EP2558807A1 publication Critical patent/EP2558807A1/en
Publication of EP2558807B1 publication Critical patent/EP2558807B1/en
Application granted granted Critical
Publication of EP2558807B8 publication Critical patent/EP2558807B8/en
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B11/00—Bell-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/667—Multi-station furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • C21D9/667—Multi-station furnaces
    • C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/04—Circulating atmospheres by mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers

Definitions

  • the invention relates to a method for preheating Glühgut in a Bebelglühstrom with the annealed under a protective hood in a protective atmosphere receiving Glühsockeln, wherein the heat-treated in a protective cover annealing material is preheated by means of a gaseous heat carrier in a circuit the protective hoods lapped from the outside and absorbs heat from a heat-treated in a protective cover Glühgut and delivers to a vorzu Dunndes annealing in another protective hood.
  • the recorded by an incandescent annealing material is heated under a protective cover in a protective gas atmosphere, with the aid of a protective hood over the hood heated, which is heated, for example via gas burners.
  • a protective hood over the hood heated, which is heated, for example via gas burners.
  • the residues of lubricant adhering to the material to be annealed evaporate and are withdrawn from the protector with a partial flow of protective gas.
  • the annealed material is cooled again.
  • the invention is therefore based on the object, a method of the type described for preheating Glühgut in a Bebelglühstrom in such a way that the energy used for heat treatment of the Glühguts can be advantageously used without the risk of contamination of a heat treatment to be subjected to incandescent purchase to have to take.
  • the invention solves the problem set by the fact that for heat treatment of the annealing at least one other glow base is used with a heatable from the outside burner protective cover and that the hot exhaust gases from the heating of this guard are added to the heated heat carrier for preheating the annealing.
  • the resulting upon heating of the annealing to its treatment temperature gases are added to the heated in the pre-cooling of the annealing, gaseous heat transfer and applied with this gas mixture, which has a higher energy potential compared to the preheated heat transfer, the protective cover of the annealing base for preheating the annealing. Because of the Schutzbaubenbeetzstoffung with the heat transfer stream from the outside of a contamination of the annealed material is excluded via the heat transfer stream.
  • the conditional by the admixture of the exhaust gases to the heat transfer gas excess gas is continuously eliminated from the heat transfer circuit, and preferably from the cooled after the preheating of the annealed heat transfer stream.
  • At least one further Glühsockel is provided with a protective hood and a protective cover which can be heated by burners whose exhaust pipe opens into the flow channel for the heated heat carrier, and that the flow channel for the cooled heat carrier is provided with an excess outlet, so the hot exhaust gases from the heating hood mix with the heat carrier in the flow channel that has been heated during pre-cooling of the already heat-treated annealed can be acted upon by the associated protective cover with the gas mixture to be heated.
  • the excess outlet serves to discharge the gas excess to be discharged from the heat carrier circuit.
  • To control the gas mixture within the flow channel for the heated heat carrier provided for the circulation of the heat carrier circuit blower can be controlled in dependence on the pressure in this flow channel, wherein an at least approximately constant pressure is sought in this flow channel.
  • each Glühsockel 1, 2, 3 is a Glühgut 4, 5, 6 outwardly final protective hood 7 assigned, in which in a known manner, a protective gas is circulated by means of a blower 8 according to the flow arrows 9.
  • These protective hoods 7 are arranged within housings 10, which are connected to one another via flow channels 11, 12 for a gaseous heat carrier.
  • the housing 10 designed as a heat exchange hood for the glow base 1 is assigned a circulation blower 13 for a circulation flow of the heat carrier via the flow channels 11 and 12.
  • the housings 10 of the other two glow plugs 2 and 3 are designed as heating hoods 14, preferably with gas operated burner 15 has to heat the Glühgut 5, 6 by applying the respective protective hood 7 with the hot combustion gases to the predetermined treatment temperature.
  • the heat transfer takes place from the hot combustion gases via the protective hood 7 to the protective gas circulated within the protective hood 7 and from this protective gas to the annealed goods 5 and 6.
  • the heating hoods 14 of the inventive Glühhaubenstrom a connecting line 16 to the flow channel 11 and an opening into the flow channel 12 exhaust pipe 17. With the help of control flaps 8, the respective flow path for the heat carrier can be set.
  • the gaseous heat transfer medium is circulated by means of the circulation fan 13 between the housing 10 of the base 1 and the heating cap 14 of the base 2, but the burner 15 of the heat cover 14 are turned off after the material to be annealed 5 through the burner 15 has been heated to the treatment temperature and ready for cooling.
  • the heat transfer medium flowing through the connection line 16 from the flow channel 11 into the heating hood 14 of the glow base 2 is therefore heated by the protective hood 7 of this glow base 2 under a pre-treatment of the glow material 5 in order to release its heat to the annealing stock 4 on the glow base 1, which is cold was applied to the glow base 1 and thus preheated by the application of the protective cover 7 with the heated heat transfer medium.
  • a preheated annealing material 6 is heated on the annealing base 3 via the heating cap 14 to the treatment temperature by the protective hood 7 for the Glühgut 6 is acted upon by the hot gases of the burner 15.
  • the control valve 18 in the connecting line 16 is to close for this heating operation.
  • the exhaust gases from the heating hood 14 of the Glühsockels 3 are therefore supplied via the exhaust pipe 17 to the flow channel 12, in which the circulating between the housings 10 of the Glühsockel 1 and 2 in the circulation heat carrier mixes with the exhaust gases to make the preheating of the cold Glühguts 4 on the Glühsockel 1 with the mixed gases, the more energy is supplied due to the admixture of the exhaust gases from the heating hood 14 of the Glühsockels 3, as in the pre-cooling of the Glühguts 5 on the Glühsockel Has 2 heated heat carrier, so that the heat energy used for the heat treatment of the annealed 6 can be advantageously used. If several glow plugs are used for heating the annealing stock to the treatment temperature, then the exhaust gases from all the heating mantles of this glow socket are advantageously introduced into the flow channel 12 for the heated heat carrier.
  • the flow channel 12 for the heated heat carrier is connected to the excess outlet 19 of the flow channel for the cooled heat carrier of the heat transfer medium via a flap 20.
  • This flap 20 is opened when serving as a heat exchange housing housing 10 of the base 1 is not yet put into operation, so that the exhaust gases of the heating hood 14 of the base 3 can be deducted via the excess outlet 19 by a connected to the excess outlet 19 fireplace.
  • the housings 10 of the Glühsockel 1 and 2 and the protective hood 7 of Glow socket 2 removed.
  • the pre-cooled Glühgut 5 is finally cooled by means of a cooling hood before it is replaced by cold, a heat treatment to be subjected to Glühgut.
  • the cold annealed material can be preheated and the preheated annealed material 4 can be heated to the annealing base 1 to the treatment temperature, as already described.
  • the housing 10 with the circulation fan 13 are placed on the glow base 2 and the heating hood 14 of the glow base 2 on the glow base 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Heat Treatment Of Articles (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)

Abstract

The invention relates to a method for pre-heating annealing material (4, 5) in a hood-type annealing system having annealing bases (1, 2) that accommodate the annealing material (4, 5) under a protective hood (7) in a protective-gas atmosphere, wherein the annealing material (4) to be subjected to a heat treatment in a protective hood (7) is pre-heated by means of a gaseous heat-transfer medium, which flows around the protective hoods (7) from the outside in a circuit and absorbs heat from annealing material (5) already heat-treated in a protective hood (7) and rejects heat to annealing material (4) to be pre-heated in another protective hood (7). In order to achieve advantageous use of the thermal energy, at least one further annealing base (3) having a protective hood (7) that can be heated from the outside by means of burners (15) is used to heat-treat the annealing material (4, 5, 6), and the hot exhaust gases from the heater of said protective hood (7) are mixed with the heated heat-transfer medium for pre-heating the annealing material (4).

Description

Verfahren zum Vorwärmen von Glühqut in einer Haubenglühanlage Technisches Gebiet  Method of preheating Glühqut in a bell-type annealing plant Technical field
Die Erfindung bezieht sich auf ein Verfahren zum Vorwärmen von Glühgut in einer Haubenglühanlage mit das Glühgut unter einer Schutzhaube in einer Schutzgasatmosphäre aufnehmenden Glühsockeln, wobei das in einer Schutzhaube einer Wärmebehandlung zu unterziehende Glühgut mit Hilfe eines gasförmigen Wärmeträgers vorgewärmt wird, der in einem Kreislauf die Schutzhauben von außen umspült und Wärme von einem in einer Schutzhaube bereits wärmebehandelten Glühgut aufnimmt und an ein vorzuwärmendes Glühgut in einer anderen Schutzhaube abgibt. The invention relates to a method for preheating Glühgut in a Bebelglühanlage with the annealed under a protective hood in a protective atmosphere receiving Glühsockeln, wherein the heat-treated in a protective cover annealing material is preheated by means of a gaseous heat carrier in a circuit the protective hoods lapped from the outside and absorbs heat from a heat-treated in a protective cover Glühgut and delivers to a vorzuwärmendes annealing in another protective hood.
Stand der Technik State of the art
Zur Wärmebehandlung von Glühgut, wie warm oder kalt verformte Bänder oder Drähte, wird das von einem Glühsockel aufgenommene Glühgut unter einer Schutzhaube in einer Schutzgasatmosphäre erwärmt, und zwar mit Hilfe einer über die Schutzhaube gestülpten Heizhaube, die beispielsweise über Gasbrenner beheizt wird. Bei der Wärmebehandlung verdampfen die am Glühgut anhaftenden Schmiermittelreste und werden mit einem Schutzgasteilstrom aus der Schutzhabe abgezogen. Nach der Wärmebehandlung wird das Glühgut wieder gekühlt. Um einen Teil der beim Kühlen des Glühguts anfallenden Wärme zum Vorwärmen von erst einer Wärmebehandlung zu unterziehendem Glühgut nützen zu können, ist es bei Haubenglühanlagen mit wenigstens zwei Glühsockeln bekannt, zwischen den Schutzhauben zweier Glühsockel, die einerseits bereits einer Wärmebehandlung unterworfenes, heißes Glühgut und anderseits einer solchen Behandlung auszusetzendes, kaltes Glühgut tragen, eine Strömungsverbindung zur Kreislaufführung eines gasförmigen Wärmeträgers zu schaffen, sodass die innerhalb der Schutzhaube mit dem heißen Glühgut vom Wärmeträger aufgenommene Wärme zum Vorwärmen des kalten Glühguts in der anderen Schutzhaube genützt werden kann, allerdings mit dem Nachteil, dass aufgrund der Kreislaufführung des Wärmeträgers die Gefahr besteht, dass beim Vorwärmen des kalten Glühguts abdampfendes Schmiermittel das wärmebehandelte, vom Schmiermittel gereinigte Glühgut wieder verunreinigt. Soll der unmittelbare Kontakt zwischen warmem und kaltem Schutzgas vermeiden werden, ist ein aufwendiger zusätzlicher Wärmeaustausch zwischen den Schutzgasströmen notwendig. Außerdem müssen die Schutzgasströme durch große Öffnungen im Glühsockel geführt werden was große Sicherheitsrisiken in sich birgt. For heat treatment of Glühgut, such as hot or cold-formed bands or wires, the recorded by an incandescent annealing material is heated under a protective cover in a protective gas atmosphere, with the aid of a protective hood over the hood heated, which is heated, for example via gas burners. During the heat treatment, the residues of lubricant adhering to the material to be annealed evaporate and are withdrawn from the protector with a partial flow of protective gas. After the heat treatment, the annealed material is cooled again. In order to be able to use part of the heat generated during cooling of the annealing to preheat only annealing material to be subjected to a heat treatment, it is known in the case of bell annealing plants with at least two incandescent bases, between the protective covers of two annealing bases on the one hand already subjected to a heat treatment, hot Glühgut and on the other hand auszusetzendes such treatment, cold annealing to create a flow connection for recirculation of a gaseous heat carrier, so that the heat absorbed within the guard with the hot annealing heat from the heat carrier for preheating the cold annealing in the other Protective hood can be used, however, with the disadvantage that due to the circulation of the heat carrier there is a risk that contaminated during preheating of the cold annealing lubricant lubricating the heat-treated, cleaned of lubricant annealing again. If the direct contact between the hot and cold shielding gas is to be avoided, a complex additional heat exchange between the protective gas streams is necessary. In addition, the protective gas flows must be passed through large openings in the glow base, which entails great safety risks.
Darstellung der Erfindung Presentation of the invention
Der Erfindung liegt somit die Aufgabe zugrunde, ein Verfahren der eingangs geschilderten Art zum Vorwärmen von Glühgut in einer Haubenglühanlage so auszugestalten, dass die zur Wärmebehandlung des Glühguts eingesetzte Energie vorteilhaft genützt werden kann, ohne die Gefahr einer Verunreinigung des einer Wärmebehandlung zu unterziehenden Glühguts in Kauf nehmen zu müssen. The invention is therefore based on the object, a method of the type described for preheating Glühgut in a Bebelglühanlage in such a way that the energy used for heat treatment of the Glühguts can be advantageously used without the risk of contamination of a heat treatment to be subjected to incandescent purchase to have to take.
Die Erfindung löst die gestellte Aufgabe dadurch, dass zur Wärmebehandlung des Glühguts wenigstens ein weiterer Glühsockel mit einer von außen über Brenner beheizbaren Schutzhaube eingesetzt wird und dass die heißen Abgase von der Heizung dieser Schutzhaube dem erwärmten Wärmeträger zur Vorwärmung des Glühguts zugemischt werden. The invention solves the problem set by the fact that for heat treatment of the annealing at least one other glow base is used with a heatable from the outside burner protective cover and that the hot exhaust gases from the heating of this guard are added to the heated heat carrier for preheating the annealing.
Da aufgrund dieser Maßnahme nicht nur ein Teil der beim Kühlen des Glühguts nach seiner Wärmebehandlung anfallenden Wärme für das Vorwärmen des noch nicht behandelten Glühguts genützt wird, sondern zusätzlich auch ein Teil der fühlbaren Abwärme der Abgase, die beim Erwärmen des vorgewärmten Glühguts auf die Behandlungstemperatur anfallen und eine höhere Temperatur als der Wärmeträger nach der Vorkühlung des Glühguts aufweisen, kann die eingesetzte Wärmeenergie besser genützt und das Glühgut rascher auf die Behandlungstemperatur erwärmt werden. Die beim Erwärmen des Glühguts auf seine Behandlungstemperatur anfallenden Gase werden dem bei der Vorkühlung des Glühguts erwärmten, gasförmigen Wärmeträger zugemischt und mit dieser Gasmischung, die gegenüber dem vorgewärmten Wärmeträger ein höheres Energiepotential aufweist, die Schutzhaube des Glühsockels zur Vorwärmung des Glühguts beaufschlagt. Wegen der Schutzhaubenbeaufschlagung mit dem Wärmeträgerstrom jeweils von außen ist eine Verunreinigung des Glühguts über den Wärmeträgerstrom ausgeschlossen. Der durch die Zumischung der Abgase zum Wärmeträgerstrom bedingte Gasüberschuss wird laufend aus dem Wärmeträgerkreislauf ausgeschieden, und zwar vorzugsweise aus dem nach der Vorwärmung des Glühguts abgekühlten Wärmeträgerstrom. Because of this measure, not only a part of the costs incurred in cooling the annealing material after its heat treatment heat for preheating the not yet treated annealed is used, but in addition also a part of the sensible waste heat of the exhaust gases incurred during heating of the preheated Glühguts to the treatment temperature and have a higher temperature than the heat carrier after the precooling of the annealed, the heat energy used and the better Annealing material should be heated more quickly to the treatment temperature. The resulting upon heating of the annealing to its treatment temperature gases are added to the heated in the pre-cooling of the annealing, gaseous heat transfer and applied with this gas mixture, which has a higher energy potential compared to the preheated heat transfer, the protective cover of the annealing base for preheating the annealing. Because of the Schutzbaubenbeaufschlagung with the heat transfer stream from the outside of a contamination of the annealed material is excluded via the heat transfer stream. The conditional by the admixture of the exhaust gases to the heat transfer gas excess gas is continuously eliminated from the heat transfer circuit, and preferably from the cooled after the preheating of the annealed heat transfer stream.
Zur Durchführung des vorgeschlagenen Verfahrens kann vorteilhaft von einer Haubenglühanlage mit das Glühgut unter einer Schutzhaube aufnehmenden Glühsockeln, mit den Schutzhauben zugeordneten Umwälzeinrichtungen für ein Schutzgas und mit einer Kreislaufführung für einen gasförmigen Wärmeträger ausgegangen werden, die die Schutzhauben mit Abstand umschließende Einhausungen und die Einhausungen miteinander zu einem Kreislauf zusammenfassende Strömungskanäle umfasst. Erfindungswesentlich ist, dass wenigstens ein weiterer Glühsockel mit einer Schutzhaube und einer die Schutzhaube umschließenden, durch Brenner beheizbaren Heizhaube vorgesehen ist, deren Abgasleitung in den Strömungskanal für den erwärmten Wärmeträger mündet, und dass der Strömungskanal für den gekühlten Wärmeträger mit einem Überschussauslass versehen ist, sodass sich die heißen Abgase aus der Heizhaube mit dem beim Vorkühlen des bereits wärmebehandelten Glühguts erwärmten Wärmeträger im Strömungskanal mischen und das vor- zuwärmende Glühgut über die zugehörige Schutzhaube mit dem Gasgemisch beaufschlagt werden kann. Der Überschussauslass dient zum Abführen des aus dem Wärmeträgerkreislauf auszuscheidenden Gasüberschusses. To carry out the proposed method can advantageously be assumed by a Bebelglühanlage with the annealed under a protective hood receiving Glühsockeln associated with the protective hoods Umwälzeinrichtungen for a shielding gas and with a circulation for a gaseous heat transfer, the protective covers with enclosing enclosures and the enclosures to each other comprising flow recirculation channels. Is essential to the invention that at least one further Glühsockel is provided with a protective hood and a protective cover which can be heated by burners whose exhaust pipe opens into the flow channel for the heated heat carrier, and that the flow channel for the cooled heat carrier is provided with an excess outlet, so the hot exhaust gases from the heating hood mix with the heat carrier in the flow channel that has been heated during pre-cooling of the already heat-treated annealed can be acted upon by the associated protective cover with the gas mixture to be heated. The excess outlet serves to discharge the gas excess to be discharged from the heat carrier circuit.
Zur Steuerung der Gasmischung innerhalb des Strömungskanals für den erwärmten Wärmeträger kann das für die Kreislaufführung des Wärmeträgers vorgesehene Kreislaufgebläse in Abhängigkeit vom Druck in diesem Strömungskanal angesteuert werden, wobei ein zumindest angenähert gleichbleibender Druck in diesem Strömungskanal angestrebt wird. To control the gas mixture within the flow channel for the heated heat carrier provided for the circulation of the heat carrier circuit blower can be controlled in dependence on the pressure in this flow channel, wherein an at least approximately constant pressure is sought in this flow channel.
Kurze Beschreibung der Zeichnung Short description of the drawing
Anhand der Zeichnung wird das erfindungsgemäße Verfahren zum Vorwärmen von Glühgut näher erläutert, und zwar wird eine erfindungsgemäße Hauben- glühanlage zum Vorwärmen von Glühgut in einem schematischen Vertikalschnitt gezeigt. The inventive method for preheating Glühgut is explained in more detail with reference to the drawing, and indeed a hood annealing system according to the invention for preheating Glühgut is shown in a schematic vertical section.
Weg zur Ausführung der Erfindung Way to carry out the invention
In der Zeichnung sind drei Glühsockeln 1 , 2, 3 einer Haubenglühanlage zur chargenweisen Aufnahme des Glühguts 4, 5, 6 dargestellt. Jedem Glühsockel 1 , 2, 3 ist eine das Glühgut 4, 5, 6 nach außen abschließende Schutzhaube 7 zugeordnet, in der in bekannter Weise ein Schutzgas mit Hilfe eines Gebläses 8 entsprechend den Strömungspfeilen 9 umgewälzt wird. Diese Schutzhauben 7 sind innerhalb von Einhausungen 10 angeordnet, die miteinander über Strömungskanäle 11 , 12 für einen gasförmigen Wärmeträger verbunden sind. Der als Wärmetauschhaube ausgebildeten Einhausung 10 für den Glühsockel 1 ist ein Kreislaufgebläse 13 für eine Kreislaufströmung des Wärmeträgers über die Strömungskanäle 11 und 12 zugeordnet. Während die Wärmetauschhaube des Glühsockels 1 lediglich zur Beaufschlagung der diesem Glühsockel 1 zugehörigen Schutzhaube 7 dient, sind die Einhausungen 10 der beiden anderen Glühsockeln 2 und 3 als Heizhauben 14 ausgebildet, die vorzugsweise mit Gas betriebene Brenner 15 aufweist, um das Glühgut 5, 6 durch eine Beaufschlagung der jeweiligen Schutzhaube 7 mit den heißen Brennergasen auf die vorgegebene Behandlungstemperatur zu erwärmen. Die Wärmeübertragung erfolgt dabei von den heißen Brennergasen über die Schutzhaube 7 auf das innerhalb der Schutzhaube 7 umgewälzte Schutzgas und von diesem Schutzgas auf das Glühgut 5 bzw. 6. Zum Unterschied zu herkömmlichen Heizhauben weisen die Heizhauben 14 der erfindungsgemäßen Glühhaubenanlage eine Anschlussleitung 16 an den Strömungskanal 11 und eine in den Strömungskanal 12 mündende Abgasleitung 17 auf. Mit Hilfe von Steuerklappen 8 kann der jeweilige Strömungsweg für den Wärmeträger festgelegt werden. In the drawing, three Glühsockeln 1, 2, 3 a Bebelglühanlage for batchwise recording of Glühguts 4, 5, 6 are shown. Each Glühsockel 1, 2, 3 is a Glühgut 4, 5, 6 outwardly final protective hood 7 assigned, in which in a known manner, a protective gas is circulated by means of a blower 8 according to the flow arrows 9. These protective hoods 7 are arranged within housings 10, which are connected to one another via flow channels 11, 12 for a gaseous heat carrier. The housing 10 designed as a heat exchange hood for the glow base 1 is assigned a circulation blower 13 for a circulation flow of the heat carrier via the flow channels 11 and 12. While the heat exchange cover of the glow base 1 only serves to act on this glow socket 1 associated protective hood 7, the housings 10 of the other two glow plugs 2 and 3 are designed as heating hoods 14, preferably with gas operated burner 15 has to heat the Glühgut 5, 6 by applying the respective protective hood 7 with the hot combustion gases to the predetermined treatment temperature. In this case, the heat transfer takes place from the hot combustion gases via the protective hood 7 to the protective gas circulated within the protective hood 7 and from this protective gas to the annealed goods 5 and 6. In contrast to conventional heating hoods, the heating hoods 14 of the inventive Glühhaubenanlage a connecting line 16 to the flow channel 11 and an opening into the flow channel 12 exhaust pipe 17. With the help of control flaps 8, the respective flow path for the heat carrier can be set.
Im dargestellten Betriebszustand der Haubenglühanlage wird der gasförmige Wärmeträger mit Hilfe des Kreislaufgebläses 13 zwischen der Einhausung 10 des Glühsockels 1 und der Heizhaube 14 des Glühsockels 2 im Kreislauf geführt, wobei jedoch die Brenner 15 der Heizhaube 14 abgeschaltet sind, nachdem das Glühgut 5 über die Brenner 15 auf die Behandlungstemperatur erwärmt worden und zur Kühlung bereit ist. Der durch die Anschlussleitung 16 aus dem Strömungskanal 11 in die Heizhaube 14 des Glühsockels 2 strömende Wärmeträger wird daher über die Schutzhaube 7 dieses Glühsockels 2 unter eine Vorkühiung des Glühguts 5 erwärmt, um seine Wärme an das Glühgut 4 auf dem Glühsockel 1 abzugeben, das kalt auf den Glühsockel 1 aufgebracht wurde und somit durch die Beaufschlagung der Schutzhaube 7 mit dem erwärmten Wärmeträger vorgewärmt wird. Während die bei der Abkühlung des Glühguts 5 auf dem Sockel 2 gewonnene Wärme zur Vorwärmung des kalten Glühguts 4 auf dem Glühsockel 1 genützt wird, wird ein vorgewärmtes Glühgut 6 auf dem Glühsockel 3 über die Heizhaube 14 auf die Behandlungstemperatur erwärmt, indem die Schutzhaube 7 für das Glühgut 6 mit den heißen Gasen der Brenner 15 beaufschlagt wird. Die Steuerklappe 18 in der Anschlussleitung 16 ist für diesen Heizbetrieb zu schließen. Die Abgase aus der Heizhaube 14 des Glühsockels 3 werden daher über die Abgasleitung 17 dem Strömungskanal 12 zugeführt, in dem sich der im Kreislauf zwischen den Einhausungen 10 der Glühsockel 1 und 2 im Kreislauf geführte Wärmeträger mit den Abgasen mischt, um die Vorwärmung des kalten Glühguts 4 auf dem Glühsockel 1 mit den Mischgasen vorzunehmen, dem aufgrund der Zumischung der Abgase aus der Heizhaube 14 des Glühsockels 3 mehr Energie zugeführt wird, als der bei der Vorkühlung des Glühguts 5 auf dem Glühsockel 2 erwärmte Wärmeträger aufweist, sodass die für die Wärmebehandlung des Glühguts 6 eingesetzte Wärmeenergie vorteilhaft genützt werden kann. Kommen mehrere Glühsockel zum Erwärmen des Glühguts auf die Behandlungstemperatur zum Einsatz, so werden die Abgase aus all den Heizhauben dieser Glühsockel vorteilhaft in den Strömungskanal 12 für den erwärmten Wärmeträger eingeleitet. In the illustrated operating state of the Bebelglühanlage the gaseous heat transfer medium is circulated by means of the circulation fan 13 between the housing 10 of the base 1 and the heating cap 14 of the base 2, but the burner 15 of the heat cover 14 are turned off after the material to be annealed 5 through the burner 15 has been heated to the treatment temperature and ready for cooling. The heat transfer medium flowing through the connection line 16 from the flow channel 11 into the heating hood 14 of the glow base 2 is therefore heated by the protective hood 7 of this glow base 2 under a pre-treatment of the glow material 5 in order to release its heat to the annealing stock 4 on the glow base 1, which is cold was applied to the glow base 1 and thus preheated by the application of the protective cover 7 with the heated heat transfer medium. While the heat obtained during the cooling of the annealing material 5 on the base 2 is used to preheat the cold annealing stock 4 on the annealing base 1, a preheated annealing material 6 is heated on the annealing base 3 via the heating cap 14 to the treatment temperature by the protective hood 7 for the Glühgut 6 is acted upon by the hot gases of the burner 15. The control valve 18 in the connecting line 16 is to close for this heating operation. The exhaust gases from the heating hood 14 of the Glühsockels 3 are therefore supplied via the exhaust pipe 17 to the flow channel 12, in which the circulating between the housings 10 of the Glühsockel 1 and 2 in the circulation heat carrier mixes with the exhaust gases to make the preheating of the cold Glühguts 4 on the Glühsockel 1 with the mixed gases, the more energy is supplied due to the admixture of the exhaust gases from the heating hood 14 of the Glühsockels 3, as in the pre-cooling of the Glühguts 5 on the Glühsockel Has 2 heated heat carrier, so that the heat energy used for the heat treatment of the annealed 6 can be advantageously used. If several glow plugs are used for heating the annealing stock to the treatment temperature, then the exhaust gases from all the heating mantles of this glow socket are advantageously introduced into the flow channel 12 for the heated heat carrier.
Der durch die Einleitung der Abgase aus der Heizhaube 14 des Glühsockels 3 in den Kreislauf des Wärmeträgers anfallende Gasüberschuss wird über einen Überschussauslass 19 aus dem Wärmeträgerkreislauf ausgeschieden, und zwar aus dem Strömungskanal 11 für den abgekühlten Wärmeträger, um das Überschussgas mit einem möglichst niedrigen Energieniveau abzuführen. Die Steuerung der Gasströme erfolgt einerseits über die Steuerklappen 18 und anderseits über den Druck im Strömungskanal 12 für den erwärmten Wärmeträger. Dieser Druck im Strömungskanal 12 wird über eine entsprechende Ansteuerung des Kreislaufgebläses 3 weitgehend konstant gehalten. The resulting from the introduction of the exhaust gases from the heating hood 14 of the Glühsockels 3 in the circulation of the heat transfer gas excess is eliminated via an excess outlet 19 from the heat carrier circuit, namely from the flow channel 11 for the cooled heat carrier to dissipate the excess gas with the lowest possible energy level , The control of the gas flows on the one hand via the control valves 18 and on the other hand via the pressure in the flow channel 12 for the heated heat carrier. This pressure in the flow channel 12 is kept substantially constant via a corresponding control of the circulation blower 3.
Der Strömungskanal 12 für den erwärmten Wärmeträger ist mit dem Überschussauslass 19 des Strömungskanals für den abgekühlten Wärmeträger des Wärmeträgerkreises über eine Klappe 20 verbunden. Diese Klappe 20 wird geöffnet, wenn die als Wärmetauschhaube dienende Einhausung 10 des Glühsockels 1 noch nicht in Betrieb genommen wurde, sodass die Abgase der Heizhaube 14 des Glühsockels 3 über den Überschussauslass 19 durch einen an den Überschussauslass 19 angeschlossenen Kamin abgezogen werden können. The flow channel 12 for the heated heat carrier is connected to the excess outlet 19 of the flow channel for the cooled heat carrier of the heat transfer medium via a flap 20. This flap 20 is opened when serving as a heat exchange housing housing 10 of the base 1 is not yet put into operation, so that the exhaust gases of the heating hood 14 of the base 3 can be deducted via the excess outlet 19 by a connected to the excess outlet 19 fireplace.
Nach der Wärmebehandlung des Glühguts 6 auf dem Glühsockel 3 werden die Einhausungen 10 der Glühsockel 1 und 2 sowie die Schutzhaube 7 des Glühsockels 2 abgenommen. Das vorgekühlte Glühgut 5 wird mit Hilfe einer Kühlhaube abschließend gekühlt, bevor es durch kaltes, einer Wärmebehandlung zu unterwerfendes Glühgut ersetzt wird. Nach einem entsprechenden Auswechseln der Einhausungen 10 kann somit wiederum das kalte Glühgut vorgewärmt und das vorgewärmte Glühgut 4 auf dem Glühsockel 1 auf die Behandlungstemperatur erwärmt werden, wie dies bereits beschrieben wurde. Zu diesem Zweck sind die Einhausung 10 mit dem Kreislaufgebläse 13 auf den Glühsockel 2 und die Heizhaube 14 des Glühsockels 2 auf den Glühsockel 1 aufzusetzen. After the heat treatment of the Glühguts 6 on the Glühsockel 3, the housings 10 of the Glühsockel 1 and 2 and the protective hood 7 of Glow socket 2 removed. The pre-cooled Glühgut 5 is finally cooled by means of a cooling hood before it is replaced by cold, a heat treatment to be subjected to Glühgut. After a corresponding replacement of the housings 10, in turn, the cold annealed material can be preheated and the preheated annealed material 4 can be heated to the annealing base 1 to the treatment temperature, as already described. For this purpose, the housing 10 with the circulation fan 13 are placed on the glow base 2 and the heating hood 14 of the glow base 2 on the glow base 1.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zum Vorwärmen von Glühgut (4, 5) in einer Haubenglühanla- ge mit das Glühgut (4, 5) unter einer Schutzhaube (7) in einer Schutzgasatmosphäre aufnehmenden Glühsockeln (1 , 2), wobei das in einer Schutzhaube (7) einer Wärmebehandlung zu unterziehende Glühgut (4) mit Hilfe eines gasförmigen Wärmeträgers vorgewärmt wird, der in einem Kreislauf die Schutzhauben (7) von außen umspült und Wärme von einem in einer Schutzhaube (7) bereits wärmebehandelten Glühgut (5) aufnimmt und an ein vorzuwärmendes Glühgut (4) in einer anderen Schutzhaube (7) abgibt, dadurch gekennzeichnet, dass zur Wärmebehandlung des Glühguts (4, 5, 6) wenigstens ein weiterer Glühsockel (3) mit einer von außen über Brenner (15) beheizbaren Schutzhaube (7) eingesetzt wird und dass die heißen Abgase von der Heizung dieser Schutzhaube (7) dem erwärmten Wärmeträger zur Vorwärmung des Glühguts (4) zugemischt werden. 1. A method for preheating Glühgut (4, 5) in a Haubenglühanla- ge with the Glühgut (4, 5) under a protective hood (7) in a protective gas atmosphere receiving Glühsockeln (1, 2), wherein in a protective hood (7) a heat treatment to be subjected to annealing (4) is preheated by means of a gaseous heat carrier in a circuit around the protective hoods (7) from the outside and absorbs heat from a in a protective hood (7) already heat treated Glühgut (5) and to a vorzuwärmendes annealing (4) in another protective hood (7), characterized in that for the heat treatment of the Glühguts (4, 5, 6) at least one further Glühsockel (3) with an externally via burner (15) heated protective hood (7) is used and that the hot exhaust gases from the heating of this protective hood (7) are admixed with the heated heat carrier for preheating the Glühguts (4).
2. Haubenglühanlage zur Durchführung des Verfahrens nach Anspruch 1 mit das Glühgut (4, 5) unter einer Schutzhaube (7) aufnehmenden Glühsockeln (1 , 2), mit den Schutzhauben (7) zugeordneten Umwälzeinrichtungen für ein Schutzgas und mit einer Kreislaufführung für einen gasförmigen Wärmeträger, die die Schutzhauben (7) mit Abstand umschließende Einhausungen (10) und die Einhausungen (10) miteinander zu einem Kreislauf zusammenfassende Strömungskanäle (11 , 12) umfasst, dadurch gekennzeichnet, dass wenigstens ein weiterer Glühsockel (3) mit einer Schutzhaube (7) und einer die Schutzhaube (7) umschließenden, durch Brenner (15) beheizbaren Heizhaube (14) vorgesehen ist, deren Abgasleitung (17) in den Strömungskanal (12) für den erwärmten Wärmeträger mündet, und dass der Strömungskanal (11) für den gekühlten Wärmeträger mit einem Überschussauslass (19) versehen ist. 2. Bebelglühanlage for carrying out the method according to claim 1 with the Glühgut (4, 5) under a protective hood (7) receiving Glühsockeln (1, 2), with the protective hoods (7) associated Umwälzeinrichtungen for a protective gas and with a circulation control for a gaseous Heat transfer medium comprising the protective hoods (7) enclosing enclosing enclosures (10) and the housings (10) with one another to a circuit flow channels (11, 12), characterized in that at least one further Glühsockel (3) with a protective hood (7 ) and a protective hood (7) enclosing, by burner (15) heatable heating hood (14) is provided, the exhaust pipe (17) opens into the flow channel (12) for the heated heat carrier, and that the flow channel (11) for the cooled Heat transfer medium is provided with an excess outlet (19).
3. Haubenglühanlage nach Anspruch 2, dadurch gekennzeichnet, dass die Kreislaufführung für den Wärmeträger wenigstens ein in Abhängigkeit vom Druck im Strömungskanal (12) für den erwärmten Wärmeträger steuerbares Kreislaufgebläse (13) aufweist. 3. Bebelglühanlage according to claim 2, characterized in that the circulation for the heat carrier at least one in dependence on the pressure in the flow channel (12) for the heated heat carrier controllable circulation blower (13).
EP11719752.5A 2010-04-14 2011-04-07 Method for pre-heating annealing material in a hood-type annealing system Revoked EP2558807B8 (en)

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AT0059010A AT508776B1 (en) 2010-04-14 2010-04-14 PROCESS FOR PREHEATING GLOWING IN A BROWN GLOW SYSTEM
PCT/AT2011/000166 WO2011127501A1 (en) 2010-04-14 2011-04-07 Method for pre-heating annealing material in a hood-type annealing system

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EP2558807B1 (en) 2014-10-08
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TW201200600A (en) 2012-01-01
EP2558807B8 (en) 2015-01-28
PL2558807T3 (en) 2015-03-31
WO2011127501A1 (en) 2011-10-20
AT508776B1 (en) 2011-04-15
CN102906524B (en) 2015-10-14
ZA201207540B (en) 2014-04-30
CA2796202A1 (en) 2011-10-20
KR20130057427A (en) 2013-05-31
US20130040256A1 (en) 2013-02-14
MX2012011893A (en) 2013-02-11
RU2012148287A (en) 2014-05-20
AT508776A4 (en) 2011-04-15
BR112012025876A2 (en) 2016-06-28

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