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EP2411752A1 - Method for preheating annealing products in a hood-type annealing system - Google Patents

Method for preheating annealing products in a hood-type annealing system

Info

Publication number
EP2411752A1
EP2411752A1 EP10714155A EP10714155A EP2411752A1 EP 2411752 A1 EP2411752 A1 EP 2411752A1 EP 10714155 A EP10714155 A EP 10714155A EP 10714155 A EP10714155 A EP 10714155A EP 2411752 A1 EP2411752 A1 EP 2411752A1
Authority
EP
European Patent Office
Prior art keywords
protective
heat
hood
annealing
heat transfer
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
EP10714155A
Other languages
German (de)
French (fr)
Other versions
EP2411752B1 (en
Inventor
Robert Ebner
Gerhard Denk
Heribert Lochner
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
Application filed by Ebner Industrieofenbau GmbH filed Critical Ebner Industrieofenbau GmbH
Priority to PL10714155T priority Critical patent/PL2411752T3/en
Publication of EP2411752A1 publication Critical patent/EP2411752A1/en
Application granted granted Critical
Publication of EP2411752B1 publication Critical patent/EP2411752B1/en
Not-in-force 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
    • 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
    • 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
    • C21D9/677—Arrangements of heating devices
    • 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

Definitions

  • the invention relates to a method for preheating Glühgut in a Bebelglühstrom with two annealing under a protective cap receiving Glühsockeln, wherein the heat-treated in a protective cover annealing is preheated by means of a gaseous heat carrier, which led between the two protective hoods in the circuit is and receives heat from a heat treated in a protective annealing and emits heat to be preheated in the other protective hood.
  • Baubenglühanlagen serve to annealing material, such as hot or cold-formed strips or wires, under a protective gas to subject to a heat treatment.
  • the annealing material picked up by an incandescent base is heated under a protective cover in a protective gas atmosphere, with the aid of a heat hood placed over the protective cover, which is heated electrically or by gas burners, so that the annealed material is essentially radiated by radiant heat to the protective cover outer wall and convection the protective hood inner wall is heated to the treatment temperature.
  • 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 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 risk of contamination of the already subjected to a heat treatment annealed material can be excluded.
  • the invention solves this problem by virtue of the fact that the circulating heat carrier stream flows around the two protective hoods from the outside, while a protective gas is circulated within the protective hoods, as a result of which, inter alia, no passage openings in the base are necessary.
  • the circulating heat carrier does not come into contact with the annealed material, no impurities can be transferred from the cold to the hot annealing material via this heat carrier stream become.
  • the heat transfer takes place via the protective hoods, in which protective gas is circulated for heat transport. Due to this fact, the heat transfer medium itself may consist of air without having to fear oxide formation by the atmospheric oxygen on the annealing material surface.
  • the heat transfer medium therefore flows between the two enclosures in the circuit, where it absorbs heat via the protective cover with the hot annealed material and releases it via the other protective cover to the cold annealed material until a temperature compensation takes place.
  • the warm material to be annealed is then cooled in a conventional manner with a cooling hood, while the preheated Glühgut is to be heated to the respective treatment temperature by the enclosure is replaced by a heating hood.
  • Another embodiment of a Glühhaubenstrom for preheating the Glühguts arises when the circulation for the heat carrier has a two guard together enclosing, thermally insulated housing with at least one fan for the circulation of the heat carrier.
  • the heat transfer medium circulated in this common housing ensures a temperature compensation between the protective hoods with the hot and the cold annealed goods, the inert gas circulation in the protective hoods in turn providing heat transfer from or to the annealed material.
  • baffles for the circulation of the heat carrier can be provided inside the enclosure baffles for the circulation of the heat carrier.
  • the heat carrier can be performed in a simple manner in the circuit.
  • the heat transfer conditions between the heat transfer medium and the protective cover within the housing can be optimized by means of corresponding guide devices which are to be provided between the housing and the protective cover.
  • FIG. 3 a of FIG. 1 corresponding representation of a modified Haubenglühstrom invention
  • Fig. 4 the Bebelglühstrom according to FIG. 3 in a section along the line IV-IV of Fig. 3 and
  • FIG. 5 shows a further embodiment of a bell annealing system according to the invention in a schematic vertical section.
  • the glow base 1, 2 are provided with a fan 5 and with a guide 6 for the fan 5 for circulating an inert gas within a surrounding the Glühgut 3, 4 guard 7, 8.
  • For heat treatment of the Glühguts 3, 4 is over the protective hoods 7. 8 in a conventional manner, a heatable electrically or by means of gas burners heating hood slipped, but this is not shown for clarity reasons.
  • the protective hoods 7, 8 are in each case provided with a heat-insulated housing 9, according to the illustrated method for preheating an annealing stock to be heat-treated by means of the heat of an already heat-treated annealing stock, the arrangement being such that the two housings 9 pass through one another Flow channels 10 are connected to 9 lead a gaseous heat transfer medium between the two housings, as can be seen in particular in FIG.
  • the gaseous heat transfer medium preferably air, is displaced by means of blowers 11 into a circulating flow, in the region of which the protective hoods 7 and 8 are bathed by the heat carrier for heat input or output.
  • the heating cap used for this purpose is removed and replaced by the heat-insulated housing 9.
  • the recorded from the base 2, cold Glühgut 3 should be preheated before using a heating hood, with the help of the heat of the already heat-treated hot annealing 4.
  • the cold Glühgut 3 receiving protective cover 8 is provided with a housing 9, so that the heated heat transfer medium from the housing 9 for the protective hood 7 with the hot annealed material 4 is conveyed into the housing 9 for the protective hood 8 with the cold annealed material 3 via the fans 11.
  • the heat removed from the hot annealing 4 heat is fed to the cold annealing with the help of the circulation of the heat carrier and the Glühgut preheated accordingly until the temperature in the two housings 9 is substantially balanced.
  • the circulation of the heat transfer medium is to be interrupted, wherein sucked for continued cooling of the annealing 4 either fresh air into the enclosure 9 or the cooling in a conventional manner, in a cooling hood, not shown with air or water, is continued.
  • the heat treatment of the preheated Glühguts 3 is continued by replacing the housing 9 by a heating hood, with the help of the preheated Glühgut 3 is further heated to the necessary treatment temperature. After the heat treatment of the Glühguts 3 whose heat can be used again for preheating of cold Glühgut, which is then subjected to the Glühsockel 1 an analogue preheating.
  • FIGS. 3 and 4 differs from that according to FIGS. 1 and 2 essentially in that for both protective hoods 7, 8 of the glow bases 1, 2 a common, heat-insulated housing 9 is provided, in which by means of at least a blower 12 a gaseous heat transfer medium is guided in a circle, that the two protective hoods 7 and 8 be washed by the heat carrier stream successively.
  • baffles 13 may be provided for the circulation of the heat carrier within the enclosure, which force a corresponding flushing of the protective hoods 7 and 8, as shown in FIG. 4 can be removed.
  • the fan 12 may also be provided with a guide 14, which provides for a flow distribution of height.
  • the preheating of the cold Glühguts 3 on the Glühsockel 2 within the protective cover 8 is analogous to FIGS. 1 and 2, because of the hot, already subjected to a heat treatment annealing 4 transmitted through the circulating inert gas to the protective cover 7 and from this to the heat carrier Heat of the protective cover 8 is supplied to the annealing material 3 to be preheated and transferred to the circulating inert gas within the protective cover 8 in order to preheat the annealed material 3.
  • a heating hood 15 can also fulfill the function of a housing 9 because it is only a question of a flow around the protective cover 7 for the hot annealing material 4 of a heat carrier for receiving the hot annealed material 4 via a Protective gas circulation to dissipate dissipated heat.
  • the provided with gas burners 16 or electrically heated heating hood 15 is provided for this purpose with a surrounding ring line 17 through which the heat transfer medium to be heated distributed over the circumference stub lines 18 in the bottom area is introduced into the heating hood 15, the gas burner 16 after the heat treatment Of course, the annealing 4 are turned off.
  • an additional guide 20 may be provided in the form of a cover enclosing the protective cover 8, which is connected via an annular channel 21 to the flow channel 10, so that the heated heat transfer medium through bottom-near passage openings 22 of the guide 20 in the annular space between the protective cover 8 and the guide 20, the protective cover 8 flows around and gives off heat to the protective cover 8, so that this heat emitted can be transferred from the inside of the protective cover 8 circulated inert gas to the annealed 3 , The thereby cooled heat transfer medium is supplied via the suction fan 19 and a flow channel 10 between the suction fan 19 and the ring line 17 of the heating hood 15 for heating.
  • the recuperator 23 which is usually connected to the heating hood 15 for utilizing the sensible waste heat of the combustion gases withdrawn from the heating hood during the heat treatment of the incandescent material 4, has no significance in this context.
  • the circulation flow of the heat carrier can be additionally controlled by control valves 24 in the flow channels 10.
  • the connecting pieces 25 may be connected to the flow channels 10 via corresponding couplings 26.
  • the heating hood 15 can also be on the right and the housing 9 (exchange hood) also on the left.
  • heating hood 15 and the housing 9 also alternately absorb the Glühgut to be heated or cooled and can be of a similar design and the circulation of the inert gas can be reversed understood itself.

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  • 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)
  • Heat Treatments In General, Especially Conveying And Cooling (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)
  • Tunnel Furnaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

A method is described for preheating annealing products in a hood-type annealing system comprising two annealing bases (1, 2) receiving the annealing products (3, 4) under a protective hood (7, 8), wherein the annealing products (3) to be subjected to heat treatment in a protective hood (8) are preheated by way of a gaseous heat transfer medium which is circulated between the two protective hoods (7, 8) and absorbs heat from annealing products (4) heat-treated in a protective hood (7) and dissipates it to the annealing products (3) to be preheated in the other protective hood (8). In order to prevent contaminations of the heat-treated annealing products (4), it is proposed for the current of circulated heat transfer medium to flow around the two protective hoods (7, 8) on the outside, while an inert gas is recirculated inside the protective hoods (7, 8).

Description

Verfahren zum Vorwärmen von Glühgut in einer Haubenqlühanlage Method for preheating Glühgut in a Haubenqlühanlage
Technisches GebietTechnical area
Die Erfindung bezieht sich auf ein Verfahren zum Vorwärmen von Glühgut in einer Haubenglühanlage mit zwei das Glühgut unter einer Schutzhaube aufnehmenden Glühsockeln, wobei das in einer Schutzhaube einer Wärmebehandlung zu unterziehende Glühgut mit Hilfe eines gasförmigen Wärmeträgers vorgewärmt wird, der zwischen den beiden Schutzhauben im Kreislauf geführt wird und Wärme von einem in einer Schutzhaube wärmebehandelten Glühgut aufnimmt und an das vorzuwärmende Glühgut in der anderen Schutzhaube abgibt.The invention relates to a method for preheating Glühgut in a Bebelglühanlage with two annealing under a protective cap receiving Glühsockeln, wherein the heat-treated in a protective cover annealing is preheated by means of a gaseous heat carrier, which led between the two protective hoods in the circuit is and receives heat from a heat treated in a protective annealing and emits heat to be preheated in the other protective hood.
Stand der TechnikState of the art
Haubenglühanlagen dienen dazu, Glühgut, wie warm oder kalt verformte Bänder oder Drähte, unter Schutzgas einer Wärmebehandlung zu unterwerfen. Zu diesem Zweck 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 elektrisch oder über Gasbrenner beheizt wird, sodass das Glühgut im Wesentlichen durch Strahlungswärme an die Schutzhaubenaußenwand und Konvektion von der Schutzhaubeninnenwand auf die Behandlungstemperatur erwärmt 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. Will man den direkten Kontakt des warmen und kalten Schutzgases vermeiden, ist ein aufwändiger zusätzlicher Gas/Gas-Wärmeaustausch notwendig. In beiden Fällen müssen die Schutzgasströme durch große Öffnungen im Sockel geführt werden was große Sicherheitsrisiken in sich birgt.Baubenglühanlagen serve to annealing material, such as hot or cold-formed strips or wires, under a protective gas to subject to a heat treatment. For this purpose, the annealing material picked up by an incandescent base is heated under a protective cover in a protective gas atmosphere, with the aid of a heat hood placed over the protective cover, which is heated electrically or by gas burners, so that the annealed material is essentially radiated by radiant heat to the protective cover outer wall and convection the protective hood inner wall is heated to the treatment temperature. 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. To a part of the heat generated during the cooling of the Glühguts to preheat only To use a heat treatment to be subjected to annealing, it is known in Bebelglühanlagen with at least two Glühsockel between the protective covers of two Glühsockel already subjected to a heat treatment, hot Glühgut and on the other hand auszusetzendes such treatment, cold Glühgut, a flow connection for recirculation To create a gaseous heat carrier, so that the heat absorbed within the protective cover with the hot annealing heat from the heat carrier for preheating the cold annealing in the other guard, but with the disadvantage that due to the circulation of the heat carrier there is a risk that during preheating of evaporating lubricant contaminates the heat-treated annealing stock cleaned by the lubricant. If you want to avoid the direct contact of the warm and cold shielding gas, a complex additional gas / gas heat exchange is necessary. In both cases, the protective gas flows must be passed through large openings in the base, which entails great safety risks.
Darstellung der ErfindungPresentation 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 Gefahr einer Verunreinigung des bereits einer Wärmebehandlung unterzogenen Glühguts ausgeschlossen werden kann.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 risk of contamination of the already subjected to a heat treatment annealed material can be excluded.
Die Erfindung löst die gestellte Aufgabe dadurch, dass der im Kreislauf geführte Wärmeträgerstrom die beiden Schutzhauben von außen umspült, während innerhalb der Schutzhauben ein Schutzgas umgewälzt wird, wodurch unter anderem keine Durchtrittsöffnungen im Sockel notwendig sind.The invention solves this problem by virtue of the fact that the circulating heat carrier stream flows around the two protective hoods from the outside, while a protective gas is circulated within the protective hoods, as a result of which, inter alia, no passage openings in the base are necessary.
Da zufolge dieser Maßnahme der im Kreislauf geführte Wärmeträger nicht mit dem Glühgut in Berührung kommt, können über diesen Wärmeträgerstrom auch keine Verunreinigungen vom kalten auf das warme Glühgut übertragen werden. Die Wärmeübertragung erfolgt dabei über die Schutzhauben, in denen zum Wärmetransport Schutzgas umgewälzt wird. Aufgrund dieses Umstands kann der Wärmeträger selbst aus Luft bestehen, ohne eine Oxidbildung durch den Luftsauerstoff auf der Glühgutoberfläche befürchten zu müssen.Since, according to this measure, the circulating heat carrier does not come into contact with the annealed material, no impurities can be transferred from the cold to the hot annealing material via this heat carrier stream become. The heat transfer takes place via the protective hoods, in which protective gas is circulated for heat transport. Due to this fact, the heat transfer medium itself may consist of air without having to fear oxide formation by the atmospheric oxygen on the annealing material surface.
Zur Durchführung eines solchen Verfahrens zum Vorwärmen von Glühgut können unterschiedliche Haubenglühanlagen eingesetzt werden. Eine Möglichkeit besteht bei einer Haubenglühanlage mit zwei das Glühgut unter einer Schutzhaube aufnehmenden Glühsockeln, mit den Schutzhauben zugeordneten Umwälzeinrichtungen für ein Schutzgas und mit einer Kreislaufführung für einen gasförmigen Wärmeträger zwischen den beiden Schutzhauben darin, die Kreislaufführung für den Wärmeträger mit je einer die beiden Schutzhauben mit Abstand umschließenden, wärmegedämmten Einhausung auszurüsten und zwischen den beiden Einhausungen zur Kreislaufführung des Wärmeträgers eine Strömungsverbindung vorzusehen. Der Wärmeträger strömt daher zwischen den beiden Einhausungen im Kreislauf, wobei er über die Schutzhaube mit dem heißen Glühgut Wärme aufnimmt und diese über die andere Schutzhaube an das kalte Glühgut abgibt, bis ein Temperaturausgleich stattfindet. Das warme Glühgut ist dann in herkömmlicher Weise mit einer Kühlhaube weiter zu kühlen, während das vorgewärmte Glühgut auf die jeweilige Behandlungstemperatur zu erwärmen ist, indem die Einhausung durch eine Heizhaube ersetzt wird.To carry out such a method for preheating Glühgut different Bebelglühanlagen can be used. One possibility consists in a Bebelglühanlage with two Glühgut under a protective cap receiving Glühsockeln, associated with the protective hoods Umwälzeinrichtungen for a protective gas and with a circulation for a gaseous heat transfer between the two protective covers therein, the circulation for the heat transfer with one of the two protective hoods Provide spacing enclosing, insulated housing and provide between the two enclosures for recycling the heat transfer fluid flow connection. The heat transfer medium therefore flows between the two enclosures in the circuit, where it absorbs heat via the protective cover with the hot annealed material and releases it via the other protective cover to the cold annealed material until a temperature compensation takes place. The warm material to be annealed is then cooled in a conventional manner with a cooling hood, while the preheated Glühgut is to be heated to the respective treatment temperature by the enclosure is replaced by a heating hood.
Eine weitere Ausführungsform einer Glühhaubenanlage zur Vorwärmung des Glühguts ergibt sich, wenn die Kreislaufführung für den Wärmeträger eine die beiden Schutzhauben gemeinsam umschließende, wärmegedämmte Einhausung mit wenigstens einem Gebläse für die Kreislaufführung des Wärmeträgers aufweist. Der in dieser gemeinsamen Einhausung umgewälzte Wärmeträger sorgt für einen Temperaturausgleich zwischen den Schutzhauben mit dem heißen und dem kalten Glühgut, wobei wiederum die Schutzgasumwälzung in den Schutzhauben für eine Wärmeübertragung vom bzw. auf das Glühgut sorgt. Zur Verbesserung des Wärmeübergangs sind die Schutzhauben mit dem Wärmeträger entsprechend anzuströmen. Zu diesem Zweck können innerhalb der Einhausung Leitwände für die Kreislaufführung des Wärmeträgers vorgesehen werden.Another embodiment of a Glühhaubenanlage for preheating the Glühguts arises when the circulation for the heat carrier has a two guard together enclosing, thermally insulated housing with at least one fan for the circulation of the heat carrier. The heat transfer medium circulated in this common housing ensures a temperature compensation between the protective hoods with the hot and the cold annealed goods, the inert gas circulation in the protective hoods in turn providing heat transfer from or to the annealed material. To improve the heat transfer, the hoods with the Heat up the heat transfer medium accordingly. For this purpose, inside the enclosure baffles for the circulation of the heat carrier can be provided.
Schließlich kann zum Vorwärmen des Glühguts die zu dessen Erwärmung notwendige, über die Schutzhaube gestülpte Heizhaube herangezogen werden, wenn die Kreislaufführung für den Wärmeträger eine die Schutzhaube mit dem vorzuwärmenden Gut mit Abstand umschließende, wärmegedämmte Einhausung aufweist, die mit der über die Schutzhaube mit dem wärmebehandelten Glühgut gestülpten Heizhaube zur Kreislaufführung des Wärmeträgers strömungsverbunden ist. In diesem Fall braucht lediglich die das vorzuwärmende Glühgut aufnehmende Schutzhaube mit einer gesonderten Einhausung versehen zu werden, weil die Heizhaube für das bereits wärmebehandelte Glühgut vorteilhaft zur Führung des Wärmeträgers eingesetzt werden kann. Mit einer entsprechenden Strömungsverbindung zwischen der Heizhaube und der Einhausung für die Schutzhaube des vorzuwärmenden Glühguts kann somit der Wärmeträger in einfacher Art im Kreislauf geführt werden. Die Wärmeübergangsbedingungen zwischen dem Wärmeträger und der Schutzhaube innerhalb der Einhausung können mit Hilfe entsprechender Leiteinrichtungen optimiert werden, die zwischen der Einhausung und der Schutzhaube vorzusehen sind.Finally, it can be used to preheat the annealing necessary for its heating, slipped over the protective hood heating hood, when the circuit for the heat transfer has a protective cover with the vorzuwärmenden good by far enclosing, thermally insulated housing with the over the guard with the heat treated Glühgut inverted heating hood for circulating the heat transfer fluid is connected. In this case, only needs to be provided with a separate enclosure the preheating the Glühzu receiving protective cover, because the heating cover for the already heat treated annealing can be advantageously used to guide the heat carrier. With a corresponding flow connection between the heating hood and the enclosure for the protective hood of the annealed Glühguts thus the heat carrier can be performed in a simple manner in the circuit. The heat transfer conditions between the heat transfer medium and the protective cover within the housing can be optimized by means of corresponding guide devices which are to be provided between the housing and the protective cover.
Vereinfachte Verhältnisse zum wechselweisen Vorwärmen und Abkühlen von auf den Glühsockeln abgestelltem Glühgut ergeben sich, wenn die wärmegedämmte Einhausung gleicherart wie die Heizhaube ausgebildet ist. Die Strömungsrichtung des Wärmeträgers kann dabei vorzugsweise umkehrbar sein.Simplified conditions for alternate preheating and cooling of placed on the Glühsockeln Glühgut arise when the heat-insulated housing of the same kind as the heating hood is formed. The flow direction of the heat carrier may preferably be reversible.
Kurze Beschreibung der ZeichnungShort description of the drawing
Anhand der Zeichnung wird das erfindungsgemäße Verfahren zum Vorwärmen von Glühgut in einer Haubenglühanlage näher beschrieben. Es zeigen Fig. 1 eine erfindungsgemäße Haubenglühanlage zum Vorwärmen von Glühgut in einem schematischen Vertikalschnitt,With reference to the drawing, the inventive method for preheating Glühgut is described in detail in a Bebelglühanlage. Show it 1 shows a bell annealing plant according to the invention for preheating annealing stock in a schematic vertical section,
Fig. 2 diese Haubenglühanlage in einem Schnitt nach der Linie N-Il der Fig. 1 ,2 this bell annealing plant in a section along the line N-II of FIG. 1,
Fig. 3 eine der Fig. 1 entsprechende Darstellung einer abgewandelten erfindungsgemäßen Haubenglühanlage,3 a of FIG. 1 corresponding representation of a modified Haubenglühanlage invention,
Fig. 4 die Haubenglühanlage nach der Fig. 3 in einem Schnitt nach der Linie IV-IV der Fig. 3 undFig. 4, the Bebelglühanlage according to FIG. 3 in a section along the line IV-IV of Fig. 3 and
Fig. 5 eine weitere Ausführungsform einer erfindungsgemäßen Haubenglühanlage in einem schematischen Vertikalschnitt.5 shows a further embodiment of a bell annealing system according to the invention in a schematic vertical section.
Weg zur Ausführung der ErfindungWay to carry out the invention
Gemäß dem Ausführungsbeispiel nach den Fig. 1 und 2 weist die Haubenglühanlage zwei Glühsockeln 1 und 2 zur Aufnahme von Glühgut 3, 4 auf. Die Glühsockel 1 , 2 sind mit einem Gebläse 5 und mit einer Leiteinrichtung 6 für das Gebläse 5 zum Umwälzen eines Schutzgases innerhalb einer das Glühgut 3, 4 umgebenden Schutzhaube 7, 8 versehen. Zur Wärmebehandlung des Glühguts 3, 4 wird über die Schutzhauben 7. 8 in herkömmlicher Weise eine elektrisch oder mit Hilfe von Gasbrennern beheizbare Heizhaube gestülpt, was jedoch aus Übersichtlichkeitsgründen nichts dargestellt ist. Die Schutzhauben 7, 8 sind gemäß dem dargestellten Verfahren zum Vorwärmen eines einer Wärmebehandlung zu unterwerfenden Glühguts mit Hilfe der Wärme eines bereits wärmebehandelten Glühguts jeweils mit einer wärmeisolierten Einhausung 9 versehen, wobei die Anordnung so getroffen ist, dass die beiden Einhausun- gen 9 miteinander durch Strömungskanäle 10 verbunden sind, um zwischen den beiden Einhausungen 9 einen gasförmigen Wärmeträger im Kreislauf zu führen, wie dies insbesondere der Fig. 2 entnommen werden kann. Der gasförmige Wärmeträger, vorzugsweise Luft, wird mit Hilfe von Gebläsen 11 in eine Umlaufströmung versetzt, in deren Bereich die Schutzhauben 7 und 8 vom Wärmeträger zur Wärmeauf- bzw. abgäbe umspült werden. Nach der Wärmebehandlung des Glühguts 4 innerhalb der Schutzhaube 7 wird die hiefür eingesetzte Heizhaube abgenommen und durch die wärmeisolierte Einhausung 9 ersetzt. Das vom Glühsockel 2 aufgenommene, kalte Glühgut 3 soll vor dem Einsatz einer Heizhaube vorgewärmt werden, und zwar mit Hilfe der Wärme des bereits wärmebehandelten heißen Glühguts 4. Zu diesem Zweck wird auch die das kalte Glühgut 3 aufnehmende Schutzhaube 8 mit einer Einhausung 9 versehen, sodass über die Gebläse 11 der erwärmte Wärmeträger aus der Einhausung 9 für die Schutzhaube 7 mit dem heißen Glühgut 4 in die Einhausung 9 für die Schutzhaube 8 mit dem kalten Glühgut 3 gefördert wird. Da zugleich über die Gebläse 5 zur Umwälzung eines Schutzgases innerhalb der Schutzhauben 7 und 8 eine Wärmeförderung über die Schutzhauben 7, 8 zwischen dem Schutzgas und dem Wärmeträger erfolgt, wird die vom heißen Glühgut 4 abgeführte Wärme dem kalten Glühgut mit Hilfe der Kreislaufführung des Wärmeträgers zugeführt und das Glühgut entsprechend vorgewärmt, bis die Temperatur in den beiden Einhausungen 9 im Wesentlichen ausgeglichen ist. Zur Fortsetzung der Kühlung des wärmebehandelten Glühguts 4 ist die Kreislaufführung des Wärmeträgers zu unterbrechen, wobei zur fortgesetzten Kühlung des Glühguts 4 entweder Frischluft in die Einhausung 9 angesaugt oder die Kühlung in herkömmlicher Weise, in einer nicht dargestellten Kühlhaube mit Luft oder Wasser, weitergeführt wird. Die Wärmebehandlung des vorgewärmten Glühguts 3 wird durch Austausch der Einhausung 9 durch eine Heizhaube fortgesetzt, mit deren Hilfe das vorgewärmte Glühgut 3 auf die notwendige Behandlungstemperatur weiter erwärmt wird. Nach der Wärmebehandlung des Glühguts 3 kann dessen Wärme wieder zur Vorwärmung von kaltem Glühgut eingesetzt werden, das dann auf dem Glühsockel 1 einer analogen Vorwärmung unterworfen wird.According to the embodiment according to FIGS. 1 and 2, the Bebelglühanlage two Glühsockeln 1 and 2 for receiving Glühgut 3, 4. The glow base 1, 2 are provided with a fan 5 and with a guide 6 for the fan 5 for circulating an inert gas within a surrounding the Glühgut 3, 4 guard 7, 8. For heat treatment of the Glühguts 3, 4 is over the protective hoods 7. 8 in a conventional manner, a heatable electrically or by means of gas burners heating hood slipped, but this is not shown for clarity reasons. The protective hoods 7, 8 are in each case provided with a heat-insulated housing 9, according to the illustrated method for preheating an annealing stock to be heat-treated by means of the heat of an already heat-treated annealing stock, the arrangement being such that the two housings 9 pass through one another Flow channels 10 are connected to 9 lead a gaseous heat transfer medium between the two housings, as can be seen in particular in FIG. The gaseous heat transfer medium, preferably air, is displaced by means of blowers 11 into a circulating flow, in the region of which the protective hoods 7 and 8 are bathed by the heat carrier for heat input or output. After the heat treatment of the incandescent material 4 within the protective hood 7, the heating cap used for this purpose is removed and replaced by the heat-insulated housing 9. The recorded from the base 2, cold Glühgut 3 should be preheated before using a heating hood, with the help of the heat of the already heat-treated hot annealing 4. For this purpose, the cold Glühgut 3 receiving protective cover 8 is provided with a housing 9, so that the heated heat transfer medium from the housing 9 for the protective hood 7 with the hot annealed material 4 is conveyed into the housing 9 for the protective hood 8 with the cold annealed material 3 via the fans 11. Since at the same time on the blower 5 for circulation of a protective gas within the protective hoods 7 and 8, a heat transfer via the protective hoods 7, 8 between the inert gas and the heat transfer, the heat removed from the hot annealing 4 heat is fed to the cold annealing with the help of the circulation of the heat carrier and the Glühgut preheated accordingly until the temperature in the two housings 9 is substantially balanced. To continue the cooling of the heat-treated annealing 4, the circulation of the heat transfer medium is to be interrupted, wherein sucked for continued cooling of the annealing 4 either fresh air into the enclosure 9 or the cooling in a conventional manner, in a cooling hood, not shown with air or water, is continued. The heat treatment of the preheated Glühguts 3 is continued by replacing the housing 9 by a heating hood, with the help of the preheated Glühgut 3 is further heated to the necessary treatment temperature. After the heat treatment of the Glühguts 3 whose heat can be used again for preheating of cold Glühgut, which is then subjected to the Glühsockel 1 an analogue preheating.
Das Ausführungsbeispiel nach den Fig. 3 und 4 unterscheidet sich von dem nach den Fig. 1 und 2 im Wesentlichen dadurch, dass für beide Schutzhauben 7, 8 der Glühsockeln 1 , 2 eine gemeinsame, wärmeisolierte Einhausung 9 vorgesehen ist, in der mit Hilfe mindestens eines Gebläses 12 ein gasförmiger Wärmeträger so im Kreis geführt wird, dass die beiden Schutzhauben 7 und 8 nacheinander vom Wärmeträgerstrom umspült werden. Zur besseren Strömungsführung können innerhalb der Einhausung 9 Leitwände 13 für die Kreislaufführung des Wärmeträgers vorgesehen sein, die eine entsprechende Umspülung der Schutzhauben 7 und 8 erzwingen, wie dies der Fig. 4 entnommen werden kann. Um eine entsprechende Strömungsaufteilung zu erhalten, kann außerdem das Gebläse 12 mit einer Leiteinrichtung 14 versehen sein, die für eine Strömungsaufteilung der Höhe nach sorgt. Die Vorwärmung des kalten Glühguts 3 auf dem Glühsockel 2 innerhalb der Schutzhaube 8 erfolgt analog zu den Fig. 1 und 2, weil die vom heißen, bereits einer Wärmebehandlung unterzogenen Glühgut 4 über das umgewälzte Schutzgas an die Schutzhaube 7 und von dieser an den Wärmeträger übertragene Wärme der Schutzhaube 8 für das vorzuwärmende Glühgut 3 zugeführt und auf das umlaufende Schutzgas innerhalb der Schutzhaube 8 übertragen wird, um das Glühgut 3 vorzuwärmen.The embodiment according to FIGS. 3 and 4 differs from that according to FIGS. 1 and 2 essentially in that for both protective hoods 7, 8 of the glow bases 1, 2 a common, heat-insulated housing 9 is provided, in which by means of at least a blower 12 a gaseous heat transfer medium is guided in a circle, that the two protective hoods 7 and 8 be washed by the heat carrier stream successively. For better flow guidance 9 baffles 13 may be provided for the circulation of the heat carrier within the enclosure, which force a corresponding flushing of the protective hoods 7 and 8, as shown in FIG. 4 can be removed. In order to obtain a corresponding flow distribution, the fan 12 may also be provided with a guide 14, which provides for a flow distribution of height. The preheating of the cold Glühguts 3 on the Glühsockel 2 within the protective cover 8 is analogous to FIGS. 1 and 2, because of the hot, already subjected to a heat treatment annealing 4 transmitted through the circulating inert gas to the protective cover 7 and from this to the heat carrier Heat of the protective cover 8 is supplied to the annealing material 3 to be preheated and transferred to the circulating inert gas within the protective cover 8 in order to preheat the annealed material 3.
Wie der Fig. 5 entnommen werden kann, kann auch eine Heizhaube 15 die Aufgabe einer Einhausung 9 erfüllen, weil es ja nur darum geht, eine die Schutzhaube 7 für das heiße Glühgut 4 umspülende Strömung eines Wärmeträgers zur Aufnahme der vom heißen Glühgut 4 über eine Schutzgasumwälzung abzuführenden Wärme sicherzustellen. Die mit Gasbrennern 16 versehene oder elektrisch beheizbare Heizhaube 15 ist zu diesem Zweck mit einer sie umschließenden Ringleitung 17 versehen, durch die der zu erwärmende Wärmeträger über um den Umfang verteilte Stichleitungen 18 im Bodenbereich in die Heizhaube 15 eingeleitet wird, deren Gasbrenner 16 nach der Wärmebehandlung des Glühguts 4 selbstverständlich abgestellt werden. Die im Ringspalt zwischen der Schutzhaube 7 und der Heizhaube 15 aufsteigende und dabei über die Schutzhaube erwärmte Wärmeträgerströmung wird mit Hilfe eines Sauggebläses 19 über einen Strömungskanal 10 in die Einhausung 9 angesaugt, um das kalte Glühgut 3 innerhalb der Schutzhaube 8 zu erwärmen. Innerhalb der Einhausung 9 kann eine zusätzliche Leiteinrichtung 20 in Form eines die Schutzhaube 8 umschließenden Mantels vorgesehen sein, der über einen Ringkanal 21 an den Strömungskanal 10 angeschlossen ist, sodass der erwärmte Wärmeträger durch bodennahe Durchtrittsöffnungen 22 der Leiteinrichtung 20 im Ringraum zwischen der Schutzhaube 8 und der Leiteinrichtung 20 die Schutzhaube 8 umspült und dabei Wärme an die Schutzhaube 8 abgibt, sodass diese abgegebenen Wärme vom innerhalb der Schutzhaube 8 umgewälzten Schutzgas an das Glühgut 3 übertragen werden kann. Der dabei abgekühlte Wärmeträger wird über das Sauggebläse 19 und einen Strömungskanal 10 zwischen dem Sauggebläse 19 und der Ringleitung 17 der Heizhaube 15 zur Erwärmung zugeführt. Der üblicherweise an die Heizhaube 15 angeschlossene Rekuperator 23 zur Ausnützung der fühlbaren Abwärme der während der Wärmebehandlung des Glühguts 4 aus der Heizhaube abgezogenen Brenngase ist in diesem Zusammenhang ohne Bedeutung. Die Kreislaufströmung des Wärmeträgers kann durch Steuerklappen 24 in den Strömungskanälen 10 zusätzlich geregelt werden. Um das Anschließen der Heizhaube 15 bzw. der wärmeisolierten Einhausung 9 an die Strömungskanäle 10 zu erleichtern, können die Anschlussstutzen 25 mit den Strömungskanälen 10 über entsprechende Kupplungen 26 verbunden sein. Entsprechend der richtigen Anordnung dieser Stutzen kann die Heizhaube 15 auch rechts und die Einhausung 9 (Tauschhaube) auch links stehen.As can be seen from FIG. 5, a heating hood 15 can also fulfill the function of a housing 9 because it is only a question of a flow around the protective cover 7 for the hot annealing material 4 of a heat carrier for receiving the hot annealed material 4 via a Protective gas circulation to dissipate dissipated heat. The provided with gas burners 16 or electrically heated heating hood 15 is provided for this purpose with a surrounding ring line 17 through which the heat transfer medium to be heated distributed over the circumference stub lines 18 in the bottom area is introduced into the heating hood 15, the gas burner 16 after the heat treatment Of course, the annealing 4 are turned off. The ascending in the annular gap between the guard 7 and the heating hood 15 and thereby heated over the guard heat transfer fluid is sucked by a suction fan 19 via a flow channel 10 in the enclosure 9 to heat the cold annealing material 3 within the protective cover 8. Within the housing 9, an additional guide 20 may be provided in the form of a cover enclosing the protective cover 8, which is connected via an annular channel 21 to the flow channel 10, so that the heated heat transfer medium through bottom-near passage openings 22 of the guide 20 in the annular space between the protective cover 8 and the guide 20, the protective cover 8 flows around and gives off heat to the protective cover 8, so that this heat emitted can be transferred from the inside of the protective cover 8 circulated inert gas to the annealed 3 , The thereby cooled heat transfer medium is supplied via the suction fan 19 and a flow channel 10 between the suction fan 19 and the ring line 17 of the heating hood 15 for heating. The recuperator 23, which is usually connected to the heating hood 15 for utilizing the sensible waste heat of the combustion gases withdrawn from the heating hood during the heat treatment of the incandescent material 4, has no significance in this context. The circulation flow of the heat carrier can be additionally controlled by control valves 24 in the flow channels 10. In order to facilitate the connection of the heating hood 15 or the heat-insulated housing 9 to the flow channels 10, the connecting pieces 25 may be connected to the flow channels 10 via corresponding couplings 26. Corresponding to the correct arrangement of these nozzles, the heating hood 15 can also be on the right and the housing 9 (exchange hood) also on the left.
Dass die Heizhaube 15 und die Einhausung 9 zudem wechselweise das aufzuheizende bzw. das abzukühlende Glühgut aufnehmen sowie gleichartig ausgebildet sein können und die Umwälzeinrichtung für das Schutzgas umkehrbar sein kann versteht sich von selbst. The fact that the heating hood 15 and the housing 9 also alternately absorb the Glühgut to be heated or cooled and can be of a similar design and the circulation of the inert gas can be reversed understood itself.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Verfahren zum Vorwärmen von Glühgut in einer Haubenglühanlage mit zwei das Glühgut (3, 4) unter einer Schutzhaube (7, 8) aufnehmenden Glühsockeln (1 , 2), wobei das in einer Schutzhaube (8) einer Wärmebehandlung zu unterziehende Glühgut (3) mit Hilfe eines gasförmigen Wärmeträgers vorgewärmt wird, der zwischen den beiden Schutzhauben (7, 8) im Kreislauf geführt wird und Wärme von einem in einer Schutzhaube (7) wärmebehandelten Glühgut (4) aufnimmt und an das vorzuwärmende Glühgut (3) in der anderen Schutzhaube (8) abgibt, dadurch gekennzeichnet, dass der im Kreislauf geführte Wärmeträgerstrom die beiden Schutzhauben (7, 8) von außen umspült, während innerhalb der Schutzhauben (7, 8) ein Schutzgas umgewälzt wird.1. A method for preheating Glühgut in a Bebelglühanlage with two annealing material (3, 4) under a protective hood (7, 8) receiving Glühsockeln (1, 2), wherein in a protective hood (8) to be subjected to a heat treatment Glühgut (3 ) is preheated by means of a gaseous heat transfer medium which is circulated between the two protective hoods (7, 8) and absorbs heat from a heat-treated annealing material (4) in a protective hood (7) and to the annealing material (3) to be preheated in the other Protective hood (8) emits, characterized in that the recirculated heat transfer stream flows around the two protective hoods (7, 8) from the outside, while inside the protective hoods (7, 8) a protective gas is circulated.
2. Haubenglühanlage zur Durchführung des Verfahrens nach Anspruch 1 mit zwei das Glühgut unter einer Schutzhaube aufnehmenden Glühsockeln, mit den Schutzhauben zugeordneten Umwälzeinrichtungen für ein Schutzgas und mit einer Kreislaufführung für einen gasförmigen Wärmeträger zwischen den beiden Schutzhauben, dadurch gekennzeichnet, dass die Kreislaufführung für den Wärmeträger je eine die beiden Schutzhauben (7, 8) mit Abstand umschließende, wärmegedämmte Einhausung (9) aufweist und dass die beiden Einhausungen (9) miteinander zur Kreislaufführung des Wärmeträgers strö- mungsverbunden sind.2. Bebelglühanlage for carrying out the method according to claim 1 with two annealing under a protective cap receiving Glühsockeln, associated with the protective hoods Umwälzeinrichtungen for a protective gas and with a circulation for a gaseous heat transfer between the two protective hoods, characterized in that the circulation for the heat transfer each one has the two protective hoods (7, 8) at a distance enclosing, thermally insulated housing (9) and that the two housings (9) are flow-connected with each other for the circulation of the heat transfer medium.
3. Haubenglühanlage zur Durchführung des Verfahrens nach Anspruch 1 mit zwei das Glühgut unter einer Schutzhaube aufnehmenden Glühsockeln, mit den Schutzhauben zugeordneten Umwälzeinrichtungen für ein Schutzgas und mit einer Kreislaufführung für einen gasförmigen Wärmeträger zwischen den beiden Schutzhauben, dadurch gekennzeichnet, dass die Kreislaufführung für den Wärmeträger eine die beiden Schutzhauben (7, 8) gemeinsam umschlie- ßende, wärmegedämmte Einhausung (9) mit wenigstens einem Gebläse (12) für die Kreislaufführung des Wärmeträgers aufweist.3. Bebelglühanlage for carrying out the method according to claim 1 with two annealing under a protective cap receiving Glühsockeln, associated with the protective hoods Umwälzeinrichtungen for a protective gas and with a circulation system for a gaseous heat transfer between the two protective hoods, characterized in that the circulation for the heat transfer medium one the two protective hoods (7, 8) together enclosing ßende, thermally insulated housing (9) with at least one fan (12) for the circulation of the heat carrier.
4. Haubenglühanlage nach Anspruch 3, dadurch gekennzeichnet, dass innerhalb der Einhausung (9) Leitwände (13) für die Kreislaufführung des Wärmeträgers vorgesehen sind.4. Bebelglühanlage according to claim 3, characterized in that inside the enclosure (9) baffles (13) are provided for the circulation of the heat carrier.
5. Haubenglühanlage zur Durchführung des Verfahrens nach Anspruch 1 mit zwei das Glühgut unter einer Schutzhaube aufnehmenden Glühsockeln, mit den Schutzhauben (7, 8) zugeordneten Umwälzeinrichtungen für ein Schutzgas, mit einer über eine Schutzhaube stülpbaren Heizhaube (15) und mit einer Kreislaufführung (10) für einen gasförmigen Wärmeträger zwischen den beiden Schutzhauben, dadurch gekennzeichnet, dass die Kreislaufführung für den Wärmeträger eine die Schutzhaube (8) mit dem vorzuwärmenden Glühgut (3) mit Abstand umschließende, wärmegedämmte Einhausung (9) aufweist, die mit der über die Schutzhaube (7) mit dem wärmebehandelten Glühgut (4) gestülpten Heizhaube (15) zur Kreislaufführung des Wärmeträgers strömungsverbun- den ist.5. Baubenglühanlage for carrying out the method according to claim 1 with two annealing under a protective cap receiving Glühsockeln, with the protective hoods (7, 8) associated Umwälzeinrichtungen for a protective gas, with a slipped over a protective cover heating hood (15) and with a circulation guide (10 ) for a gaseous heat transfer medium between the two protective hoods, characterized in that the circulation guide for the heat transfer medium has a protective casing (8) with the annealing material to be preheated (3) at a distance enclosing, thermally insulated housing (9) with the on the protective hood ( 7) with the heat-treated Glühgut (4) inverted heating hood (15) is flow-connected to the circulation of the heat carrier.
6. Haubenglühofen nach Anspruch 5, dadurch gekennzeichnet, dass die wärmegedämmte Einhausung (9) gleicherart wie die Heizhaube (15) ausgebildet ist.6. hood annealing furnace according to claim 5, characterized in that the thermally insulated housing (9) of the same kind as the heating hood (15) is formed.
7. Haubenglühanlage nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass zwischen der Einhausung (9) und der Schutzhaube (8) eine Leiteinrichtung (20) für die den Wärmeträger vorgesehen ist. 7. Haubenglühanlage according to claim 5 or 6, characterized in that between the housing (9) and the protective cover (8) is provided a guide device (20) for the heat carrier.
EP10714155.8A 2009-03-25 2010-03-18 Method for preheating annealing products in a hood-type annealing system, and hood-type annealing system Not-in-force EP2411752B1 (en)

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CN102362139A (en) 2012-02-22
EP2411752B1 (en) 2017-05-17
BRPI1012713A2 (en) 2016-04-05
JP5582319B2 (en) 2014-09-03
RU2528600C2 (en) 2014-09-20
CN102362139B (en) 2014-03-05
UA102592C2 (en) 2013-07-25
PL2411752T3 (en) 2017-11-30
JP2012521487A (en) 2012-09-13
MX2011010015A (en) 2011-10-11
KR20110130498A (en) 2011-12-05
TW201043705A (en) 2010-12-16
AT507423B1 (en) 2010-05-15
AT507423A4 (en) 2010-05-15
CA2755867A1 (en) 2010-09-30
WO2010108204A1 (en) 2010-09-30
RU2011142919A (en) 2013-04-27
ZA201107246B (en) 2012-12-27
US8790115B2 (en) 2014-07-29
US20120009536A1 (en) 2012-01-12

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