EP0740709B1 - Device for cooling the charge protection lid of annealing furnaces - Google Patents

Device for cooling the charge protection lid of annealing furnaces Download PDF

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Publication number
EP0740709B1
EP0740709B1 EP95904960A EP95904960A EP0740709B1 EP 0740709 B1 EP0740709 B1 EP 0740709B1 EP 95904960 A EP95904960 A EP 95904960A EP 95904960 A EP95904960 A EP 95904960A EP 0740709 B1 EP0740709 B1 EP 0740709B1
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EP
European Patent Office
Prior art keywords
protective cover
cooling
cooling jacket
air
fans
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95904960A
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German (de)
French (fr)
Other versions
EP0740709A1 (en
Inventor
Peter Ebner
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
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Ebner Industrieofenbau GmbH
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Application filed by Ebner Industrieofenbau GmbH filed Critical Ebner Industrieofenbau GmbH
Publication of EP0740709A1 publication Critical patent/EP0740709A1/en
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Classifications

    • 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
    • C21D9/673—Details, accessories, or equipment peculiar to bell-type furnaces
    • 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

Definitions

  • the invention relates to a device for cooling the batch protection cover of annealing furnaces with a die Protective cover enclosing, preferably hood-shaped Cooling jacket and with fans for sucking in air through the space between the protective cover and the cooling jacket, wherein the cooling jacket has a plurality of air passage openings for impact beams directed against the protective cover and the protective cover in the impact area the impact rays are according to AT-A 396525, whereby in the protective cover under a batch pad Radially conveying fan for protective gas and the fans for the cooling air in the upper area of the cooling jacket are provided.
  • the air passage openings are for the air directed as impact jets against the cooling jacket essentially over the entire cooling jacket or over the distributed the entire height of the cooling jacket and it even shows that Corresponding through openings on the top wall of the jacket.
  • the one arranged under the batch pad Fan-supported protective gas is namely initially with high momentum or high speed against the Cooling jacket thrown, so that a high in this area Heat transfer takes place.
  • Inert gas then becomes the annular gap between the outside of the batch and the inner wall of the protective cover evenly filled with protective gas, with proportions of the volume flow of the protective gas also in the spaces between the batches get and the suction mouth of the fan again are fed so that in the upper area of the protective cover the heat transfer decreases significantly.
  • the object of the invention is therefore the device to improve after the main patent so that for Manufacturing and operating a significant reduction of the technical effort.
  • the invention solves the problem that the Air openings of the cooling jacket for the impact jets above the batch level only in the lower one Height thirds of the cooling jacket are arranged.
  • the cooling jacket 4 only in the lower third of the height above the batch level 8 a plurality of air passage openings 5 and has at least one fan 6 for sucking air through the space between the protective cover 2 and the cooling jacket 4. This means that with every air passage opening 5 resulting impact beams hit the protective cover 2, wherein at the air passage openings 5 of the Cooling jacket 4 each have a tubular extension 7 is. It is essential that the air passage openings 5 above the batch level 8 exclusively are in the lower third of the height of the cooling jacket 4, which in the rest is left without any air passage opening.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Abkühlen der Chargenschutzabdeckung von Glühöfen mit einem die Schutzabdeckung umschließenden, vorzugsweise haubenförmigen Kühlmantel und mit Ventilatoren zum Durchsaugen von Luft durch den Zwischenraum zwischen Schutzabdeckung und Kühlmantel, wobei der Kühlmantel eine Vielzahl von Luftdurchtrittsöffnungen für gegen die Schutzabdeckung gerichtete Prallstrahlen aufweist und die Schutzabdeckung jeweils im Auftreffbereich der Prallstrahlen liegt, nach AT-A 396525, wobei in der Schutzabdeckung unter einer Chargenauflage ein radial fördernder Ventilator für Schutzgas und die Ventilatoren für die Kühlluft im oberen Bereich des Kühlmantels vorgesehen sind.The invention relates to a device for cooling the batch protection cover of annealing furnaces with a die Protective cover enclosing, preferably hood-shaped Cooling jacket and with fans for sucking in air through the space between the protective cover and the cooling jacket, wherein the cooling jacket has a plurality of air passage openings for impact beams directed against the protective cover and the protective cover in the impact area the impact rays are according to AT-A 396525, whereby in the protective cover under a batch pad Radially conveying fan for protective gas and the fans for the cooling air in the upper area of the cooling jacket are provided.

Nach dem Hauptpatent sind die Luftdurchtrittsöffnungen für die als Prallstrahlen gegen den Kühlmantel gerichtete Luft im wesentlichen über den ganzen Kühlmantel bzw. über die ganze Höhe des Kühlmantels verteilt und es weist sogar die Manteloberwand entsprechende Durchtrittsöffnungen auf. Da die vorangegangene Glühung der Chargen unter Schutzgas, meist Wasserstoff, erfolgt, geht es bei der nachfolgenden Abkühlung auch vor allem um die Abkühlung dieses Schutzgases unter der Schutzabdeckung. Es hat sich nun gezeigt, daß der Wärmeübergang vom Schutzgas durch die Wand der Schutzabdekkung zur als Prallstrahlen zugeführten Luft nicht über die ganze Fläche der Schutzabdeckung gleich ist, sondern hinsichtlich dieses Wärmeüberganges örtlich beträchtliche Unterschiede bestehen. Das vom unter der Chargenauflage angeordneten Ventilator geförderte Schutzgas wird nämlich zunächst mit hohem Impuls bzw. hoher Geschwindigkeit gegen den Kühlmantel geschleudert, so daß in diesem Bereich ein hoher Wärmeübergang stattfindet. Beim weiteren Hochströmen des Schutzgases wird dann der Ringspalt zwischen der Chargenaußenseite und der Innenwand der Schutzabdeckung gleichmäßig vom Schutzgas ausgefüllt, wobei Anteile des Volumenstromes des Schutzgases auch in die Zwischenräume zwischen den Chargen gelangen und dem Saugmund des Ventilators wieder zugeführt werden, so daß im oberen Bereich der Schutzabdeckung der Wärmeübergang deutlich abnimmt.According to the main patent, the air passage openings are for the air directed as impact jets against the cooling jacket essentially over the entire cooling jacket or over the distributed the entire height of the cooling jacket and it even shows that Corresponding through openings on the top wall of the jacket. There the previous annealing of the batches under protective gas, mostly hydrogen, occurs, it goes with the following Cooling down especially around the cooling of this protective gas under the protective cover. It has now been shown that the Heat transfer from the protective gas through the wall of the protective cover to the air supplied as impact jets do not have the entire area of the protective cover is the same, but in terms of this heat transfer locally considerable differences consist. The one arranged under the batch pad Fan-supported protective gas is namely initially with high momentum or high speed against the Cooling jacket thrown, so that a high in this area Heat transfer takes place. As the stream continues to flow up Inert gas then becomes the annular gap between the outside of the batch and the inner wall of the protective cover evenly filled with protective gas, with proportions of the volume flow of the protective gas also in the spaces between the batches get and the suction mouth of the fan again are fed so that in the upper area of the protective cover the heat transfer decreases significantly.

Erfindungsgemäß wurde nun erkannt, daß der obere Bereich der Schutzabdeckung für den Wärmeübergang bzw. die Kühlung durch die Prallstrahlen unwesentlich ist, und daher für die Ventilatoren die die Kühlluft durch den Zwischenraum zwischen Schutzabdeckung und Kühlmantel hindurchsaugen viel zu viel Energie aufgewendet wird. Mit der benötigten Energie bzw. dem erhöhten Wirkungsgrad dieser Ventilatoren steigen selbstverständlich der technische Aufwand für die Herstellung und dem Betrieb der Vorrichtung.According to the invention, it has now been recognized that the upper region of the Protective cover for heat transfer or cooling through the impact beams is insignificant, and therefore for the fans which the cooling air through the space between Protective cover and cooling jacket suck far too much Energy is expended. With the required energy or the increased efficiency of these fans increase of course the technical effort for the production and the operation of the device.

Der Erfindung liegt daher die Aufgabe zugrunde, die Vorrichtung nach dem Hauptpatent so zu verbessern, daß sich für Herstellung und Betrieb eine beträchtliche Verringerung des technischen Aufwandes ergibt.The object of the invention is therefore the device to improve after the main patent so that for Manufacturing and operating a significant reduction of the technical effort.

Die Erfindung löst die gestellte Aufgabe dadurch, daß die Luftdurchtrittsöffnungen des Kühlmantels für die Prallstrahlen oberhalb der Chargenauflage ausschließlich im unteren Höhendrittel des Kühlmantels angeordnet sind.The invention solves the problem that the Air openings of the cooling jacket for the impact jets above the batch level only in the lower one Height thirds of the cooling jacket are arranged.

Versuche haben ergeben, daß der Wärmeübergang vom Schutzgas zur Kühlluft in diesen unteren Bereich etwa 95 % beträgt und die ganze übrige Schutzabdeckungsfläche nur mehr etwa 5 % zur Kühlung beiträgt. Diese 5 % können aber leicht vernachläßigt werden, wenn mann bedenkt, daß durch das Fehlen aller Durchtrittsöffnungen oberhalb des unteren Höhendrittels des Kühlmantels 20 % - 30 % Energie für die Absaugeventilatoren eingespart bzw. mit wesentlich kleineren Ventilatoren gearbeitet werden kann. Dazu kommt noch die Verringerung des technischen Aufwandes, da nur eine bedeutend geringere Anzahl von Luftdurchtrittsöffnungen, die gegebenenfalls sogar mit einer rohrförmigen Verlängerung versehen sind, hergestellt werden muß.Experiments have shown that the heat transfer from the protective gas to the cooling air in this lower area is about 95% and the entire remaining protective cover area is only about Contributes 5% to cooling. This 5% can easily be neglected if you consider that the absence all through openings above the lower third of the height of the cooling jacket 20% - 30% energy for the exhaust fans saved or with much smaller fans can be worked. Then there is the reduction the technical effort, since only a significantly lower one Number of air vents, if any are even provided with a tubular extension, must be manufactured.

In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt, und zwar zeigen

Fig. 1
einen Teil eines Haubenglühofens mit der erfindungsgemäßen Vorrichtung zum Abkühlen der Chargenschutzabdeckung schematisch im Vertikalschnitt und
Fig. 2
einen Ausschnitt aus dem unteren Teil von Schutzabdeckung und Kühlmantel im größeren Maßstab.
In the drawing, the subject matter of the invention is shown, for example, and show
Fig. 1
part of a bell annealer with the inventive device for cooling the batch protection cover schematically in vertical section and
Fig. 2
a section of the lower part of the protective cover and cooling jacket on a larger scale.

Drei Stahlbunde 1 werden unter der geschlossenen Schutzabdeckung 2 unter Schutzgasumwälzung mittels eines Ventilators 3 zunächst zum Glühen gebracht und dann nach Austausch der über die Schutzabdeckung gestülpten Glühhaube durch den Kühlmantel 4 abgekühlt. Wie ersichtlich, ist der Kühlmantel 4 nur im unteren Höhendrittel über der Chargenauflage 8 mit einer Vielzahl von Luftdurchtrittsöffnungen 5 versehen und weist wenigstens einen Ventilator 6 zum Durchsaugen von Luft durch den Zwischenraum zwischen der Schutzabdeckung 2 und dem Kühlmantel 4 auf. Die dadurch bei jeder Luftdurchtrittsöffnung 5 entstehenden Prallstrahlen treffen auf die Schutzabdeckung 2 auf, wobei an den Luftdurchtrittsöffnungen 5 des Kühlmantels 4 jeweils eine rohrförmige Verlängerung 7 angeordnet ist. Wesentlich ist, daß sich die Luftdurchtrittsöffnungen 5 oberhalb der Chargenauflage 8 ausschließlich im unteren Höhendrittel des Kühlmantels 4 befinden, der im übrigen ohne jede Luftdurchtrittsöffnung belassen ist.Three bundles of steel 1 are under the closed protective cover 2 with inert gas circulation by means of a fan 3 first made to glow and then after replacing the put the mantle hood over the protective cover through the Cooling jacket 4 cooled. As can be seen, the cooling jacket 4 only in the lower third of the height above the batch level 8 a plurality of air passage openings 5 and has at least one fan 6 for sucking air through the space between the protective cover 2 and the cooling jacket 4. This means that with every air passage opening 5 resulting impact beams hit the protective cover 2, wherein at the air passage openings 5 of the Cooling jacket 4 each have a tubular extension 7 is. It is essential that the air passage openings 5 above the batch level 8 exclusively are in the lower third of the height of the cooling jacket 4, which in the rest is left without any air passage opening.

Claims (1)

  1. Apparatus for cooling the charge protective cover (2) of annealing furnaces comprising a cooling jacket (4) preferably in the form of a hood enclosing the protective cover (2), and with fans (6) for drawing air through the gap between the protective cover (2) and the cooling jacket (4), the cooling jacket (4) comprising a plurality of air passage apertures (5) for rebound jets directed towards the protective cover and the protective cover (2) being situated in the zone of impact of each of the rebound jets, a radially delivering fan (3) for protective gas being provided in the protective cover (2) beneath a charge support (8) and the fans (6) for the cooling air being provided in the upper zone of the cooling jacket (4), characterised in that the air passage apertures (5) in the cooling jacket (4) for the rebound jets are disposed above the charge support (8) solely in the bottom third of the height of the cooling jacket (4).
EP95904960A 1994-01-20 1995-01-13 Device for cooling the charge protection lid of annealing furnaces Expired - Lifetime EP0740709B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0009894A AT399775B (en) 1994-01-20 1994-01-20 DEVICE FOR COOLING THE BATCH PROTECTIVE COVER OF TUBES
AT98/94 1994-01-20
PCT/AT1995/000005 WO1995020058A1 (en) 1994-01-20 1995-01-13 Device for cooling the charge protection lid of annealing furnaces

Publications (2)

Publication Number Publication Date
EP0740709A1 EP0740709A1 (en) 1996-11-06
EP0740709B1 true EP0740709B1 (en) 1998-06-03

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ID=3481457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95904960A Expired - Lifetime EP0740709B1 (en) 1994-01-20 1995-01-13 Device for cooling the charge protection lid of annealing furnaces

Country Status (5)

Country Link
EP (1) EP0740709B1 (en)
AT (2) AT399775B (en)
DE (1) DE59502409D1 (en)
ES (1) ES2118553T3 (en)
WO (1) WO1995020058A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE217651T1 (en) * 1997-01-30 2002-06-15 Loi Thermprocess Gmbh HOOD FURNACE
DE29907320U1 (en) * 1999-04-26 1999-08-12 Drever Int Sa Device for cooling materials
CN102878814B (en) * 2012-10-31 2014-07-30 博广热能股份有限公司 Radiator with variable radiating area

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3433433C1 (en) * 1984-09-12 1985-10-24 Otto Junker Gmbh, 5107 Simmerath Device for heating or cooling metallic goods
DE3824415A1 (en) * 1988-07-19 1990-01-25 Gottfried Von Czarnowski Cooling hood for rapid cooling of red-hot material, in particular steel strip
AT396525B (en) * 1992-03-20 1993-10-25 Ebner Ind Ofenbau Device for cooling the charge-protecting cover of annealing furnaces
US5290017A (en) * 1993-03-01 1994-03-01 Indugas, Inc. Cooling cover for batch coil annealing furnace

Also Published As

Publication number Publication date
ES2118553T3 (en) 1998-09-16
AT399775B (en) 1995-07-25
DE59502409D1 (en) 1998-07-09
ATA9894A (en) 1994-11-15
EP0740709A1 (en) 1996-11-06
WO1995020058A1 (en) 1995-07-27
ATE166927T1 (en) 1998-06-15

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