WO1995020058A1 - 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
WO1995020058A1
WO1995020058A1 PCT/AT1995/000005 AT9500005W WO9520058A1 WO 1995020058 A1 WO1995020058 A1 WO 1995020058A1 AT 9500005 W AT9500005 W AT 9500005W WO 9520058 A1 WO9520058 A1 WO 9520058A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling
protective cover
air
cooling jacket
protection lid
Prior art date
Application number
PCT/AT1995/000005
Other languages
German (de)
French (fr)
Inventor
Peter Ebner
Original Assignee
Ebner-Industrieofenbau Gesellschaft Mbh
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3481457&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1995020058(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ebner-Industrieofenbau Gesellschaft Mbh filed Critical Ebner-Industrieofenbau Gesellschaft Mbh
Priority to DE59502409T priority Critical patent/DE59502409D1/en
Priority to AT95904960T priority patent/ATE166927T1/en
Priority to EP95904960A priority patent/EP0740709B1/en
Publication of WO1995020058A1 publication Critical patent/WO1995020058A1/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 preferably hood-shaped cooling jacket surrounding the protective cover and with fans for sucking air through the space between the protective cover and cooling jacket, the cooling jacket having a multiplicity of air passage openings for counter the protective cover has directed impingement jets and the protective cover is located in the area of impact of the impact jets, according to patent no. 396.525, with a 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 for the air directed as impingement jets against the cooling jacket are essentially distributed over the entire cooling jacket or over the entire height of the cooling jacket and it even has corresponding through openings on the jacket top wall. Since the previous annealing of the batches takes place under protective gas, usually hydrogen, the subsequent cooling is also primarily about 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 is not the same over the entire surface of the protective cover, but there are locally considerable differences with regard to this heat transfer.
  • the upper area of the protective cover is insignificant for the heat transfer or cooling by the impingement jets, and therefore much too much energy is used for the fans which suck the cooling air through the space between the protective cover and the cooling jacket. With the required energy or the increased efficiency of these fans, the technical effort for the production and operation of the device naturally increases.
  • the invention is therefore based on the object of improving the device according to the main patent in such a way that there is a considerable reduction in the technical outlay for manufacture and operation.
  • the invention achieves the stated object in that the air passage openings of the cooling jacket for the impingement jets above the batch support are arranged exclusively in the lower third of the height of the cooling jacket.
  • Fig. 2 shows a detail of the lower part of protective cover and cooling jacket on a larger scale.
  • Three steel coils 1 are first made to glow under the closed protective cover 2 with protective gas circulation by means of a fan 3 and then cooled by the cooling jacket 4 after replacement of the glow hood placed over the protective cover.
  • the cooling jacket 4 is provided with a large number of air passage openings 5 only in the lower third of the height above the batch support 8 and has at least one fan 6 for sucking air through the space between the protective cover 2 and the cooling jacket 4.
  • the impact jets thus created at each air passage opening 5 strike the protective cover 2, a tubular extension 7 being arranged at the air passage openings 5 of the cooling jacket 4. It is essential that the air passage openings 5 above the batch support 8 are located exclusively in the lower third of the height of the cooling jacket 4, which is otherwise left without any air passage opening.

Landscapes

  • 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)

Abstract

A device for cooling the charge protection lid (2) of annealing furnaces has a preferably hood-shaped cooling casing (4) that surrounds the protection lid (2). The cooling casing (4) is provided with fans (6) for sucking air through the intermediate space between the protection lid (2) and the cooling casing (4) as well as with a plurality of air passage openings (5) through which air is aspirated through the intermediate space between the protection lid (2) and the cooling casing (4). Through the air passage openings (5) air impact jets are directed against the protection lid (2) that lies in the impact area of said impact jets, as described in patent no. 396.525. A radial fan (3) is arranged in the protection cover (2) underneath a charge bearing (8). In order to reduce technical production and operation complexity of such a device, the air passage openings (5) of the cooling casing (4) through which air jets impact on the protection lid (2) above the charge bearing (8) are exclusively located in the lower third of the cooling casing (4).

Description

Vorrichtung zum Abkühlen der Chargen- schutzabdeckung von GlühöfenDevice for cooling the batch protection cover of annealing furnaces
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 Kühlman¬ tel, wobei der Kühlmantel eine Vielzahl von Luftdurchtritts¬ öffnungen für gegen die Schutzabdeckung gerichtete Prall¬ strahlen aufweist und die Schutzabdeckung jeweils im Auf- treffbereich der Prallstrahlen liegt, nach Patent Nr. 396.525, wobei in der Schutzabdeckung unter einer Chargen¬ auflage 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 preferably hood-shaped cooling jacket surrounding the protective cover and with fans for sucking air through the space between the protective cover and cooling jacket, the cooling jacket having a multiplicity of air passage openings for counter the protective cover has directed impingement jets and the protective cover is located in the area of impact of the impact jets, according to patent no. 396.525, with a 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 Schutzabdek- kung zur als Prallstrahlen zugeführten Luft nicht über die ganze Fläche der Schutzabdeckung gleich ist, sondern hin¬ sichtlich dieses Wärmeüberganges örtlich beträchtliche Un¬ terschiede bestehen. Das vom unter der Chargenauflage an- geordneten Ventilator geförderte Schutzgas wird nämlich zu¬ nächst 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 Chargen¬ außenseite und der Innenwand der Schutzabdeckung gleichmäßig vom Schutzgas ausgefüllt, wobei Anteile des Volumenstromes des Schutzgases auch in die Zwischenräume zwischen den Char¬ gen gelangen und dem Saugmund des Ventilators wieder zugeführt werden, so daß im oberen Bereich der Schutzab¬ deckung der Wärmeübergang deutlich abnimmt.According to the main patent, the air passage openings for the air directed as impingement jets against the cooling jacket are essentially distributed over the entire cooling jacket or over the entire height of the cooling jacket and it even has corresponding through openings on the jacket top wall. Since the previous annealing of the batches takes place under protective gas, usually hydrogen, the subsequent cooling is also primarily about 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 is not the same over the entire surface of the protective cover, but there are locally considerable differences with regard to this heat transfer. That from under the batch requirement orderly fan-assisted protective gas is namely first thrown against the cooling jacket at high momentum or high speed, so that a high heat transfer takes place in this area. When the protective gas continues to flow upward, the annular gap between the outside of the batch and the inner wall of the protective cover is then filled uniformly by the protective gas, portions of the volume flow of the protective gas also reaching the spaces between the charges and being fed back into the suction mouth of the fan, so that the heat transfer decreases significantly in the upper area of the protective cover.
Erfindungs emäß wurde nun erkannt, daß der obere Bereich der Schutzabdeckung für den Wärmeübergang bzw. die Kühlung durch die Prallstrahlen unwesentlich ist, und daher für die Ven¬ tilatoren 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 Herstel¬ lung und dem Betrieb der Vorrichtung.According to the invention, it has now been recognized that the upper area of the protective cover is insignificant for the heat transfer or cooling by the impingement jets, and therefore much too much energy is used for the fans which suck the cooling air through the space between the protective cover and the cooling jacket. With the required energy or the increased efficiency of these fans, the technical effort for the production and operation of the device naturally increases.
Der Erfindung liegt daher die Aufgabe zugrunde, die Vorrich¬ tung nach dem Hauptpatent so zu verbessern, daß sich für Herstellung und Betrieb eine beträchtliche Verringerung des technischen Aufwandes ergibt.The invention is therefore based on the object of improving the device according to the main patent in such a way that there is a considerable reduction in the technical outlay for manufacture and operation.
Die Erfindung löst die gestellte Aufgabe dadurch, daß die Luftdurchtrittsöffnungen des Kühlmantels für die Prallstrah- len oberhalb der Chargenauflage ausschließlich im unteren Höhendrittel des Kühlmantels angeordnet sind.The invention achieves the stated object in that the air passage openings of the cooling jacket for the impingement jets above the batch support are arranged exclusively in the lower third of the height of the cooling jacket.
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 ver- nachläßigt werden, wenn mann bedenkt, daß durch das Fehlen aller Durchtrittsöffnungen oberhalb des unteren Höhendrit¬ tels des Kühlmantels 20 % - 30 % Energie für die Absaugeven- tilatoren eingespart bzw. mit wesentlich kleineren Ventila¬ toren gearbeitet werden kann. Dazu kommt noch die Verringe¬ rung des technischen Aufwandes, da nur eine bedeutend gerin¬ gere 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 region is approximately 95% and the entire remaining protective cover area is only approximately Contributes 5% to cooling. However, this 5% can easily be neglected if one considers that the absence of all through openings above the lower height third of the cooling jacket saves 20% -30% energy for the suction fans or that the fans are much smaller can be. In addition, there is a reduction in the technical outlay, since only a significantly smaller number of air passage openings, which may even be provided with a tubular extension, have to be produced.
In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt, und zwar zeigenIn the drawing, the subject matter of the invention is shown, for example, and show
Fig. 1 einen Teil eines Haubenglühofens mit der erfindungs- gemäßen Vorrichtung zum Abkühlen der Chargenschutz- abdeckung schematisch im Vertikalschnitt und1 a part of a bell annealer with the device according to the invention for cooling the batch protection cover schematically in vertical section and
Fig. 2 einen Ausschnitt aus dem unteren Teil von Schutzab¬ deckung und Kühlmantel im größeren Maßstab.Fig. 2 shows a detail of the lower part of protective cover and cooling jacket on a larger scale.
Drei Stahlbunde 1 werden unter der geschlossenen Schutzab¬ deckung 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 Luftdurchtritts- Öffnung 5 entstehenden Prallstrahlen treffen auf die Schutz¬ abdeckung 2 auf, wobei an den Luftdurchtrittsöffnungen 5 des Kühlmantels 4 jeweils eine rohrförmige Verlängerung 7 ange¬ ordnet ist. Wesentlich ist, daß sich die Luftdurchtritts¬ öffnungen 5 oberhalb der Chargenauflage 8 ausschließlich im unteren Höhendrittel des Kühlmantels 4 befinden, der im übrigen ohne jede Luftdurchtrittsöffnung belassen ist. Three steel coils 1 are first made to glow under the closed protective cover 2 with protective gas circulation by means of a fan 3 and then cooled by the cooling jacket 4 after replacement of the glow hood placed over the protective cover. As can be seen, the cooling jacket 4 is provided with a large number of air passage openings 5 only in the lower third of the height above the batch support 8 and has at least one fan 6 for sucking air through the space between the protective cover 2 and the cooling jacket 4. The impact jets thus created at each air passage opening 5 strike the protective cover 2, a tubular extension 7 being arranged at the air passage openings 5 of the cooling jacket 4. It is essential that the air passage openings 5 above the batch support 8 are located exclusively in the lower third of the height of the cooling jacket 4, which is otherwise left without any air passage opening.

Claims

P a t e n t a n s p r u c h : P a t e n t a n s r u c h:
Vorrichtung zum Abkühlen der Chargenschutzabdeckung (2) von Glühöfen mit einem die Schutzabdeckung (2) umschließenden, vorzugsweise haubenförmigen Kühlmantel (4) und mit Venti¬ latoren (6) zum Durchsaugen von Luft durch den Zwischenraum zwischen Schutzabdeckung (2) und Kühlmantel (4), wobei der Kühlmantel (4) eine Vielzahl von Luftdurchtrittsöffnungen (5) für gegen die Schutzabdeckung (2) gerichtete Prall¬ strahlen aufweist und die Schutzabdeckung (2) jeweils im Auftreffbereich der Prallstrahlen liegt, nach Patent Nr. 396.525, wobei in der Schutzabdeckung (2) unter einer Char¬ genauflage (8) ein radial fördernder Ventilator (3) für Schutzgas und die Ventilatoren (6) für die Kühlluft im obe¬ ren Bereich des Kühlmantels (4) vorgesehen sind, dadurch gekennzeichnet, daß die Luftdurchtrittsöffnungen (5) des Kühlmantels (4) für die Prallstrahlen oberhalb der Chargen¬ auflage (8) ausschließlich im unteren Höhendrittel des Kühlmantels (4) angeordnet sind. Device for cooling the batch protective cover (2) of annealing furnaces with a preferably hood-shaped cooling jacket (4) surrounding the protective cover (2) and with fans (6) for sucking air through the space between the protective cover (2) and cooling jacket (4) , The cooling jacket (4) has a plurality of air passage openings (5) for impact beams directed against the protective cover (2) and the protective cover (2) lies in each case in the area of impact of the impact beams, according to Patent No. 396.525, wherein in the protective cover ( 2) under a batch support (8) a radially conveying fan (3) for protective gas and the fans (6) for the cooling air in the upper region of the cooling jacket (4) are provided, characterized in that the air passage openings (5) of the cooling jacket (4) for the impact jets above the batch support (8) are arranged exclusively in the lower third of the height of the cooling jacket (4).
PCT/AT1995/000005 1994-01-20 1995-01-13 Device for cooling the charge protection lid of annealing furnaces WO1995020058A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59502409T DE59502409D1 (en) 1994-01-20 1995-01-13 DEVICE FOR COOLING THE BATCH PROTECTIVE COVER OF TUBES
AT95904960T ATE166927T1 (en) 1994-01-20 1995-01-13 DEVICE FOR COOLING THE BATCH PROTECTION COVER OF ANNEALING FURNACES
EP95904960A EP0740709B1 (en) 1994-01-20 1995-01-13 Device for cooling the charge protection lid of annealing furnaces

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA98/94 1994-01-20
AT0009894A AT399775B (en) 1994-01-20 1994-01-20 DEVICE FOR COOLING THE BATCH PROTECTIVE COVER OF TUBES

Publications (1)

Publication Number Publication Date
WO1995020058A1 true WO1995020058A1 (en) 1995-07-27

Family

ID=3481457

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1995/000005 WO1995020058A1 (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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998033946A1 (en) * 1997-01-30 1998-08-06 Loi Thermprocess Gmbh Top hat furnace
EP1048742A3 (en) * 1999-04-26 2001-09-19 Drever International S.A. Device for cooling materials
CN102878814A (en) * 2012-10-31 2013-01-16 石家庄博广热能科技有限公司 Radiator with variable radiating area

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174589A1 (en) * 1984-09-12 1986-03-19 Otto Junker GmbH Apparatus for heating or cooling metal products
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174589A1 (en) * 1984-09-12 1986-03-19 Otto Junker GmbH Apparatus for heating or cooling metal products
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998033946A1 (en) * 1997-01-30 1998-08-06 Loi Thermprocess Gmbh Top hat furnace
DE19803259B4 (en) * 1997-01-30 2006-10-12 Loi Thermprocess Gmbh Bell furnace
EP1048742A3 (en) * 1999-04-26 2001-09-19 Drever International S.A. Device for cooling materials
CN102878814A (en) * 2012-10-31 2013-01-16 石家庄博广热能科技有限公司 Radiator with variable radiating area
CN102878814B (en) * 2012-10-31 2014-07-30 博广热能股份有限公司 Radiator with variable radiating area

Also Published As

Publication number Publication date
ATE166927T1 (en) 1998-06-15
EP0740709A1 (en) 1996-11-06
ATA9894A (en) 1994-11-15
ES2118553T3 (en) 1998-09-16
DE59502409D1 (en) 1998-07-09
EP0740709B1 (en) 1998-06-03
AT399775B (en) 1995-07-25

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