EP0298186A1 - Procédé d'opération d'un four à cloche à convection, en particulier pour les bobines de fil ou pour les feuillards d'acier - Google Patents

Procédé d'opération d'un four à cloche à convection, en particulier pour les bobines de fil ou pour les feuillards d'acier Download PDF

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Publication number
EP0298186A1
EP0298186A1 EP87890163A EP87890163A EP0298186A1 EP 0298186 A1 EP0298186 A1 EP 0298186A1 EP 87890163 A EP87890163 A EP 87890163A EP 87890163 A EP87890163 A EP 87890163A EP 0298186 A1 EP0298186 A1 EP 0298186A1
Authority
EP
European Patent Office
Prior art keywords
operating
pressure
hood
protective
annealing
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.)
Withdrawn
Application number
EP87890163A
Other languages
German (de)
English (en)
Inventor
Peter Dipl.-Ing. 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
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 EP87890163A priority Critical patent/EP0298186A1/fr
Priority to ZA875348A priority patent/ZA875348B/xx
Priority to CA000542954A priority patent/CA1318227C/fr
Publication of EP0298186A1 publication Critical patent/EP0298186A1/fr
Withdrawn legal-status Critical Current

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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
    • C21D9/667—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

Definitions

  • the invention also relates to a method for operating a convection hood annealing furnace, in particular for steel wire or strip coils, in which the annealing and the subsequent cooling take place under flammable protective gas.
  • Such hood annealing furnaces equipped with a fan are operated in such a way that after the protective hood has been placed over the collar stack, the heating hood is first put over and the air is expelled from the protective hood with a flammable protective gas. The non-flammable protective gas is then flushed out before or during the annealing process using hydrogen or another flammable protective gas. After annealing, the heating hood is pulled out and replaced by a cooling hood. Shortly before the cooling has ended, the hydrogen or the other flammable protective gas is in turn displaced from the protective hood by a non-flammable protective gas, and both hoods are removed.
  • the invention is therefore based on the object of specifying a method for operating a convection hood annealing furnace in which the safety risk is reduced to an insignificant level despite the use of flammable protective gas.
  • the invention solves this problem in that before the start of glow and / or before the start of cooling, the gas pressure under the protective hood is increased above the operating pressure, then arbitrarily lowered to a control level which is still above the operating pressure, and finally the pressure drop is checked during a predetermined period of time.
  • the degree of pressure drop during the specified period indicates whether there are any leaks. Complete tightness is practically impossible. Larger leaks, which harbor a certain source of danger, for example cracks in the protective hood or leaks in the seal between the hood and the glow base with a total cross-sectional area of more than 1 mm2, can be easily determined by waiting for the certain period of time due to the increased pressure drop, so that instead of flammable protective gas it is possible to continue with non-flammable protective gas, provided that the check has taken place before the start of the glow.
  • the previous increase in gas pressure under the protective hood with subsequent arbitrary lowering has the purpose of being able to assume the same pressure level in all measurements. Checking the pressure drop in the given time period is not only useful before the start of annealing.
  • the bundles to be glowed or the like are often introduced into the protective hood when warm.
  • air or Gas circulation under the protective hood would then lead to atmospheric warming before the annealing and thus to a certain increase in pressure, which precludes an exact pressure check. It is therefore advantageous if the pressure drop is checked in the predetermined time period before the start of glow with the fan stopped, but before the start of cooling it is carried out with the fan running so as not to impair the stability of the fan wheel.
  • Steel coil coils with a total weight of approx. 80 t should be annealed in a convection hood annealing furnace at a temperature of 700 ° C, whereby the residual volume to be filled by the protective gas was 8.5 m3 under the protective hood.
  • a non-flammable protective gas with a composition of max. 5 vol% hydrogen introduced into nitrogen until an overpressure of 22 mbar was established in the annealing room compared to the outside air.
  • the gas pressure under the protective hood was then reduced to a control level of 20 mbar above the operating pressure of 12 mbar and the pressure drop was checked over a period of 15 minutes, the furnace fan being switched off.
  • the non-flammable protective gas could be flushed out with the actual protective gas consisting of 100 vol.% Hydrogen and the annealing started.
  • a similar leak test was carried out with the fan running and maintaining the protective gas temperature of 700 ° C with pressure increase of the protective gas to 22 mbar, relaxation to 20 mbar and subsequent control of the pressure drop over a period of 15 min . Since this also resulted in a pressure drop of only 5 mbar, the batch was cooled.
  • the drawing shows the diagram of a bell annealer suitable for carrying out the method according to the invention.
  • the protective hood 2 is placed with an intermediate gasket and through which the shaft of a fan 3 passes.
  • the protective hood 2 is placed with an intermediate gasket and through which the shaft of a fan 3 passes.
  • a heating or cooling hood 5 is placed over the protective hood 2.
  • the protective hood 2 can via the engine compartment of the fan 3 non-flammable protective gas of the line 6 via the solenoid valve 7 or flammable protective gas from the Lei device 8 are supplied via the solenoid valve 9.
  • An outlet line 10 leads to the outside via a solenoid valve 11.
  • a line 12 branches off from the outlet line 10 to a pressure switch 13, to which two time relays 14, 15 are assigned.
  • the arbitrary increase and decrease of the gas pressure under the protective hood 2 is controlled by the timing relay 14 and the pressure switch 13 with the help of the solenoid valves 7 and 9.
  • the timing relay 15 checks together with the pressure switch 13 the actual pressure drop in the specified time period.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP87890163A 1987-07-09 1987-07-09 Procédé d'opération d'un four à cloche à convection, en particulier pour les bobines de fil ou pour les feuillards d'acier Withdrawn EP0298186A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP87890163A EP0298186A1 (fr) 1987-07-09 1987-07-09 Procédé d'opération d'un four à cloche à convection, en particulier pour les bobines de fil ou pour les feuillards d'acier
ZA875348A ZA875348B (en) 1987-07-09 1987-07-21 Process of operating a bell-type convection annealing furnace
CA000542954A CA1318227C (fr) 1987-07-09 1987-07-24 Mode operatoire d'un four a recuire a convection type cloche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87890163A EP0298186A1 (fr) 1987-07-09 1987-07-09 Procédé d'opération d'un four à cloche à convection, en particulier pour les bobines de fil ou pour les feuillards d'acier

Publications (1)

Publication Number Publication Date
EP0298186A1 true EP0298186A1 (fr) 1989-01-11

Family

ID=8198524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87890163A Withdrawn EP0298186A1 (fr) 1987-07-09 1987-07-09 Procédé d'opération d'un four à cloche à convection, en particulier pour les bobines de fil ou pour les feuillards d'acier

Country Status (3)

Country Link
EP (1) EP0298186A1 (fr)
CA (1) CA1318227C (fr)
ZA (1) ZA875348B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0337103A2 (fr) * 1988-03-11 1989-10-18 ISHIHARA SANGYO KAISHA, Ltd. Composition biocide
CN102632370A (zh) * 2012-04-28 2012-08-15 中冶南方(武汉)威仕工业炉有限公司 全氢罩式炉内罩制作工艺
CN106011452A (zh) * 2016-07-09 2016-10-12 新万鑫（福建）精密薄板有限公司 一种取向硅钢高温罩式炉炉内气压控制装置及方法
CN109554530A (zh) * 2018-12-12 2019-04-02 安徽工业大学 一种内置式罩式炉温度采集方法
RU2693405C1 (ru) * 2018-04-24 2019-07-02 Антон Сергеевич Руденко Способ термической металлообработки продукта и устройство для его осуществления

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556962A (en) * 1948-03-24 1951-06-12 Western Electric Co Apparatus for annealing magnetic iron
EP0133613A1 (fr) * 1983-07-05 1985-02-27 Ebner-Industrieofenbau Gesellschaft m.b.H. Procédé de refroidissement de charges dans des fours industriels travaillant de manière discontinue, en particulier de bobines de fil ou de bande d'acier dans des fours à cloche
US4596526A (en) * 1985-03-04 1986-06-24 Worthington Industries, Inc. Batch coil annealing furnace and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556962A (en) * 1948-03-24 1951-06-12 Western Electric Co Apparatus for annealing magnetic iron
EP0133613A1 (fr) * 1983-07-05 1985-02-27 Ebner-Industrieofenbau Gesellschaft m.b.H. Procédé de refroidissement de charges dans des fours industriels travaillant de manière discontinue, en particulier de bobines de fil ou de bande d'acier dans des fours à cloche
US4596526A (en) * 1985-03-04 1986-06-24 Worthington Industries, Inc. Batch coil annealing furnace and method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 126 (C-228)[1563], 13. Juni 1984; & JP - A - 59 38341 (NITSUSHIN SEIKOU) 02.03.1984 *
STAHL U. EISEN, Band 100, Nr. 17, 25. August 1980, Seiten 950-957, Düsseldorf; WITTLER et al.: "Einsatz von Mikroprozessoren in der Festbundhaubenglühe" *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0337103A2 (fr) * 1988-03-11 1989-10-18 ISHIHARA SANGYO KAISHA, Ltd. Composition biocide
CN102632370A (zh) * 2012-04-28 2012-08-15 中冶南方(武汉)威仕工业炉有限公司 全氢罩式炉内罩制作工艺
CN102632370B (zh) * 2012-04-28 2014-09-10 中冶南方(武汉)威仕工业炉有限公司 全氢罩式炉内罩制作工艺
CN106011452A (zh) * 2016-07-09 2016-10-12 新万鑫（福建）精密薄板有限公司 一种取向硅钢高温罩式炉炉内气压控制装置及方法
RU2693405C1 (ru) * 2018-04-24 2019-07-02 Антон Сергеевич Руденко Способ термической металлообработки продукта и устройство для его осуществления
CN109554530A (zh) * 2018-12-12 2019-04-02 安徽工业大学 一种内置式罩式炉温度采集方法
CN109554530B (zh) * 2018-12-12 2020-05-12 安徽工业大学 一种内置式罩式炉温度采集方法

Also Published As

Publication number Publication date
ZA875348B (en) 1988-01-27
CA1318227C (fr) 1993-05-25

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