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WO1998033946A1 - Four a cloche - Google Patents

Four a cloche Download PDF

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Publication number
WO1998033946A1
WO1998033946A1 PCT/EP1998/000246 EP9800246W WO9833946A1 WO 1998033946 A1 WO1998033946 A1 WO 1998033946A1 EP 9800246 W EP9800246 W EP 9800246W WO 9833946 A1 WO9833946 A1 WO 9833946A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling
hood
air
air nozzles
nozzles
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.)
Ceased
Application number
PCT/EP1998/000246
Other languages
German (de)
English (en)
Inventor
Frank Maschler
Walter Scheuermann
Georg Velten
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.)
LOI Thermprocess GmbH
Original Assignee
LOI Thermprocess 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 LOI Thermprocess GmbH filed Critical LOI Thermprocess GmbH
Priority to BR9805962-9A priority Critical patent/BR9805962A/pt
Priority to JP10532491A priority patent/JP2000508716A/ja
Priority to EP98904091A priority patent/EP0894150B1/fr
Priority to EA199800880A priority patent/EA000962B1/ru
Priority to AT98904091T priority patent/ATE217651T1/de
Publication of WO1998033946A1 publication Critical patent/WO1998033946A1/fr
Priority to US09/161,600 priority patent/US6177044B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • C21D9/667—Multi-station furnaces
    • C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/84—Controlled slow cooling

Definitions

  • the invention relates to a hood furnace, in particular for annealing steel sheet coils under protective gas with a protective hood which surrounds the steel sheet coils, with a cooling hood which concentrically surrounds the protective hood to form a space and which has a cooling hood jacket and a cooling hood ceiling, the cooling hood jacket having a plurality is provided by air nozzles such that cooling air strikes the protective hood in the form of prail jets and with at least one fan for generating a cooling air flow in the intermediate space.
  • Such hood furnaces are used in particular for bright annealing cold-rolled steel sheets in the form of coils in a protective gas atmosphere.
  • a cooling hood is known from WO 95/20058, in which air nozzles are arranged exclusively in the lower third of the height.
  • the coils are usually separated by convector plates.
  • the volume flows through the convector channels are significantly higher for the lower coils in the stack than for the uppermost coils. From this it follows that underlying coils are preferred for cooling and overhead coils are disadvantaged. This is reinforced by the fact that cooling only takes place in the lower area.
  • the cooling process can only be ended when the core of the uppermost coil has the max. Temperature is fallen below, so that the cooling process takes a relatively long time.
  • the object is accordingly to develop a hood furnace of the type mentioned in such a way that the cooling is improved, in particular the cooling time is reduced.
  • this object is achieved in that the nozzle spacing of the air nozzles increases from bottom to top, the nozzle spacing being 4 to 12 times the nozzle diameter and in addition the cooling hood ceiling is provided with a large number of air nozzles, the nozzle spacing is 4 to 7 times the nozzle diameter. It is structurally particularly simple if the nozzle spacing of the air nozzles of the cooling hood jacket increases continuously from bottom to top.
  • the protective gas flow changes direction at the uppermost point of the protective hoods, which means that the turbulence and thus the convective heat transfer to the cooling hood ceiling is significantly greater than that between the protective hood and the cooling hood jacket in the area of the vertical annular gap between the coils and the protective hood.
  • the cooling hood ceiling must also be provided with a large number of air nozzles in order to achieve intensive cooling here.
  • the solution according to the invention has the advantage that the cooling of the coils is optimized, which shortens the cooling process.
  • the drive power of the fan can be relatively low. Accordingly, the noise pollution is comparatively small.
  • the hood oven is characterized in that the length of the air nozzles of the cooling hood jacket is 5 to 7 times the nozzle diameter.
  • This feature is based on the knowledge that a particularly cooling impact jet occurs when a fully developed tube flow is created in the air nozzles.
  • An advantageous embodiment is that the inlet opening of the air nozzles is rounded. This reduces pressure losses.
  • the speed of the cooling air in the air nozzles is between approximately 10 to 40 m / s, preferably 15 to 30 m / s.
  • the speed of the cooling air in the air nozzles is advantageously at least three times the speed of the flow of the cooling air in the intermediate space.
  • the speed of the vertical flow in the intermediate space must be relatively low in order to ensure that the speed of the cooling air in all air nozzles in the cooling hood jacket is as equal as possible.
  • the width of the space is therefore chosen to be as large as possible.
  • the upper part of the cooling hood can also have a larger outer diameter than the lower part in order to reduce the speed of the flow.
  • Figure 1 is a hood top, schematically in longitudinal section.
  • FIG. 2 shows a quarter of a top view of a hood furnace according to FIG. 1;
  • Fig. 3 shows an air nozzle in detail on a larger scale.
  • the cooling hood 2 has a cylindrical cooling hood jacket 4 and a cooling hood cover 5.
  • a fan 6 of axial or radial type is arranged on the side of the cooling hood jacket 4.
  • the cooling hood jacket 4 is provided with air nozzles 7 over its entire height.
  • the lowest row of nozzles is located 300 - 600 mm above the protective hood flange.
  • the nozzle distance a from the center of the air nozzle 7 to the center of an adjacent air nozzle 7 increases continuously from bottom to top. It is 4 to 12 times the nozzle diameter d, which is 40 - 100 mm.
  • Fig. 2 it is shown that the cooling hood cover 5 is additionally provided with a plurality of air nozzles 7, the nozzle spacing a being 4 to 7 times the nozzle diameter d is.
  • the uppermost part of the protective hood 8, which is designed as a dished bottom, is cooled intensively.
  • the air nozzles 7 project radially inwards from the cylindrical cooling jacket surface 4.
  • the length of the air nozzles 7 is 5 to 7 times the nozzle diameter.
  • Fig. 3 it is shown that the inlet openings of the air nozzles are essentially flush and rounded with the outer wall of the cooling hood jacket in order to avoid pressure losses.
  • the speed of the cooling air in the air nozzles is between 10 to 40 m / s, preferably 15 to 30 m / s.
  • the fan 6 sucks cooling air through the intermediate space 3 and discharges the heated air upwards.
  • the inlet opening 9 to the fan 6 in the space 3 between the cooling hood 2 and protective hood 1 is rounded.
  • the speed of the vertical flow from bottom to top in the space 3 is relatively low compared to the speed of the cooling air in the air nozzles, which is at least three times the speed of the flow of the cooling air in the space 3.
  • the impingement flow from the air nozzles with the cold air drawn in from the surroundings is highly effective for cooling, the cooling effect decreasing from bottom to top.
  • the flow of air from the bottom to the top in the space hardly contributes to the cooling process, but only serves to discharge the warming cooling air upwards.
  • the upper part of the cooling hood 2 can have a larger outer diameter than the lower part.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Electric Ovens (AREA)

Abstract

L'invention concerne un four à cloche, en particulier pour le recuit de tôles d'acier sous atmosphère gazeuse protectrice, comprenant une coiffe de protection (1) entourant le paquet de tôles d'acier. Une coiffe de refroidissement est disposée au-dessus de la coiffe de protection (1) de manière à ménager un espace intermédiaire. La coiffe de refroidissement présente une enveloppe (4) et un couvercle (5). L'enveloppe présente une pluralité de buses d'air (7), de façon que l'air de refroidissement frappe la coiffe de protection (1) sous forme de jets. Au moins un ventilateur (6) produit un courant d'air de refroidissement dans l'espace intermédiaire (3). L'invention est caractérisée en ce que les intervalles (a) entre les buses d'air (7) s'accroissent au fur et à mesure qu'on monte vers le haut, en ce que l'intervalle (a) est de 4 à 12 fois supérieur au diamètre (d) des buses,et en ce que le couvercle (5) de la coiffe de refroidissement comporte une pluralité de buses d'air (7), l'intervalle (a) entre les buses étant de 4 à 7 fois supérieur au diamètre (d) des buses.
PCT/EP1998/000246 1997-01-30 1998-01-17 Four a cloche Ceased WO1998033946A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BR9805962-9A BR9805962A (pt) 1997-01-30 1998-01-17 Forno com cobertura.
JP10532491A JP2000508716A (ja) 1997-01-30 1998-01-17 バッチ焼き鈍し炉
EP98904091A EP0894150B1 (fr) 1997-01-30 1998-01-17 Four a cloche
EA199800880A EA000962B1 (ru) 1997-01-30 1998-01-17 Колпаковая печь
AT98904091T ATE217651T1 (de) 1997-01-30 1998-01-17 Haubenofen
US09/161,600 US6177044B1 (en) 1997-01-30 1998-09-25 Bell-shaped furnace

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19703305.9 1997-01-30
DE19703305 1997-01-30

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/161,600 Continuation-In-Part US6177044B1 (en) 1997-01-30 1998-09-25 Bell-shaped furnace

Publications (1)

Publication Number Publication Date
WO1998033946A1 true WO1998033946A1 (fr) 1998-08-06

Family

ID=7818731

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/000246 Ceased WO1998033946A1 (fr) 1997-01-30 1998-01-17 Four a cloche

Country Status (7)

Country Link
EP (1) EP0894150B1 (fr)
JP (1) JP2000508716A (fr)
AT (1) ATE217651T1 (fr)
BR (1) BR9805962A (fr)
DE (1) DE19803259B4 (fr)
EA (1) EA000962B1 (fr)
WO (1) WO1998033946A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1048742A2 (fr) 1999-04-26 2000-11-02 Drever International S.A. Dispositif de refroidissement de matériaux
US6346214B1 (en) * 1998-10-14 2002-02-12 Otto Junker Gmbh Top hat furnace

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3433433C1 (de) * 1984-09-12 1985-10-24 Otto Junker Gmbh, 5107 Simmerath Vorrichtung zum Erwaermen oder Kuehlen von metallischem Gut
DE3824415A1 (de) * 1988-07-19 1990-01-25 Gottfried Von Czarnowski Kuehlhaube zum schnellen abkuehlen von gluehgut, insbesondere stahlband
AT396525B (de) * 1992-03-20 1993-10-25 Ebner Ind Ofenbau Vorrichtung zum abkühlen der chargenschutzabdeckung von glühöfen
US5290017A (en) * 1993-03-01 1994-03-01 Indugas, Inc. Cooling cover for batch coil annealing furnace
WO1995020058A1 (fr) * 1994-01-20 1995-07-27 Ebner-Industrieofenbau Gesellschaft Mbh Dispositif de refroidissement du couvercle de protection de la charge dans des fours a recuire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3433433C1 (de) * 1984-09-12 1985-10-24 Otto Junker Gmbh, 5107 Simmerath Vorrichtung zum Erwaermen oder Kuehlen von metallischem Gut
DE3824415A1 (de) * 1988-07-19 1990-01-25 Gottfried Von Czarnowski Kuehlhaube zum schnellen abkuehlen von gluehgut, insbesondere stahlband
AT396525B (de) * 1992-03-20 1993-10-25 Ebner Ind Ofenbau Vorrichtung zum abkühlen der chargenschutzabdeckung von glühöfen
US5290017A (en) * 1993-03-01 1994-03-01 Indugas, Inc. Cooling cover for batch coil annealing furnace
WO1995020058A1 (fr) * 1994-01-20 1995-07-27 Ebner-Industrieofenbau Gesellschaft Mbh Dispositif de refroidissement du couvercle de protection de la charge dans des fours a recuire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6346214B1 (en) * 1998-10-14 2002-02-12 Otto Junker Gmbh Top hat furnace
EP1048742A2 (fr) 1999-04-26 2000-11-02 Drever International S.A. Dispositif de refroidissement de matériaux

Also Published As

Publication number Publication date
EA199800880A1 (ru) 1999-04-29
EP0894150B1 (fr) 2002-05-15
BR9805962A (pt) 2000-01-25
ATE217651T1 (de) 2002-06-15
EP0894150A1 (fr) 1999-02-03
DE19803259B4 (de) 2006-10-12
JP2000508716A (ja) 2000-07-11
DE19803259A1 (de) 1998-08-06
EA000962B1 (ru) 2000-08-28

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