EP0354127A1 - Haubenöfen, insbesondere zum Glühen von metallischen Coils in kontrollierter Atmosphäre - Google Patents

Haubenöfen, insbesondere zum Glühen von metallischen Coils in kontrollierter Atmosphäre Download PDF

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Publication number
EP0354127A1
EP0354127A1 EP89402210A EP89402210A EP0354127A1 EP 0354127 A1 EP0354127 A1 EP 0354127A1 EP 89402210 A EP89402210 A EP 89402210A EP 89402210 A EP89402210 A EP 89402210A EP 0354127 A1 EP0354127 A1 EP 0354127A1
Authority
EP
European Patent Office
Prior art keywords
cover
bell
base
seal
oven
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
EP89402210A
Other languages
English (en)
French (fr)
Other versions
EP0354127B1 (de
Inventor
Philippe Buchet
Yves Riollet
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.)
Fives Stein SA
Original Assignee
Stein Heurtey SA
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 Stein Heurtey SA filed Critical Stein Heurtey SA
Priority to AT89402210T priority Critical patent/ATE91012T1/de
Publication of EP0354127A1 publication Critical patent/EP0354127A1/de
Application granted granted Critical
Publication of EP0354127B1 publication Critical patent/EP0354127B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • 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 present invention relates to improvements made to bell furnaces used in particular for carrying out annealing operations on steel sheet coils in a controlled atmosphere.
  • the sheet annealing treatments are carried out either in the process of continuous steel sheet production lines, or in batch mode, using bell furnaces in which the sheet coils are placed in one or more piles on the basis of the oven.
  • a bell furnace of the known type used for carrying out such annealing operations comprises a fixed base provided with a support plate on which the coil or batteries of coils rest and under which a recirculation turbine is positioned. annealing atmosphere to avoid any oxidation of the steel sheets.
  • An internal cover isolates the load from the ambient atmosphere and from the atmosphere of the oven, this cover resting on the periphery of the base with the interposition of an annular seal.
  • This cover is itself covered with a bell furnace which is provided with heating means ensuring the heating of the load constituted by the stack or stacks of steel sheet coils.
  • the heating means of this bell furnace are constituted either by electrical resistances, or by burners so as to bring the inner cover to the high temperature necessary for the annealing operation.
  • the charge is cooled by removing the bell oven, which allows the inner cover to transfer the calories from the charge to the surrounding atmosphere by the same process of radiative and convective exchanges between the charge and the cover. interior.
  • the annealing operation is carried out under a protective atmosphere of nitrogen containing a small percentage of hydrogen, generally less than 10% and the pressure under the internal cover is constantly maintained at a value slightly higher than atmospheric pressure. in order to avoid any oxidation of the load during this operation. It is also known to avoid significant consumption of protective gas as well as to avoid the penetration of oxygen during the annealing operation, to provide a seal between the base and the cover, as is has already clarified above.
  • this seal is constituted either by a seal of the fluidized type, in which the lower part of the cover comes to rest, the stopping of the fluidization transforming this fluidized seal into a conventional sand seal, or by a rubber profile, possibly being water-cooled, this profile being interposed between a water-cooled flange and placed on the periphery of the base and a water-cooled counter-flange positioned at the lower part of the cover.
  • These water cooling systems are made necessary to avoid thermal destruction of the seal resulting from the high temperatures of the gases recirculating under the protective cover and therefore in contact with the base, as well as to avoid thermal damage due to the cover itself which is brought to high temperature by the oven which covers it.
  • the present invention has therefore set itself the objective of providing a solution making it possible not only to simplify the design of the lower part of the inner cover but also to ensure the durability of the sealing of the base-inner cover assembly.
  • the original design according to the invention of the lower part of the inner cover makes it possible to significantly reduce its temperature level, by reducing the heat transfers between the oven and the lower part of the cover, and between the protective atmosphere and the lower part of the cover while at the same time ensuring the evacuation of the heat transmitted by conduction of the metal from the cover to the flange on the seal.
  • We can thus guarantee a low temperature level at all points of this flange, making it possible to overcome the need to ensure the water circulation cooling.
  • the temperature of the flange is sufficiently homogeneous not to induce the usual thermal stresses which, in known installations, deform the flange and favor passages of the protective atmosphere at high temperature deteriorating the seal and dramatically increasing the leak.
  • the surface of this contact can, without risk of overheating and premature aging, be considerably increased by using seals of simple parallelepiped section or multiple contact in place of traditional circular or oval section joints.
  • the present invention therefore provides a bell furnace in particular for carrying out annealing operations under controlled atmosphere of metal sheets in coils which comprises a fixed base provided with a support plate on which the coil or batteries of coils rests, an insulating inner cover. the load of the ambient atmosphere and resting on said base with the interposition of an annular seal and an oven provided with heating means and which covers the cover, characterized in that a semi-sealed barrier is created between the capacity internal of said inner cover and the annular space separating the circular side wall from the periphery of the base and said inner cover and in that the lower part of the shell of said cover is provided with cooling means to reduce the flow on the one hand thermal at the level of said lower part and on the other hand dispersing this thermal flux in the ambient atmosphere.
  • said semi-sealed barrier is constituted by a ring carried by a circular dish welded to the lower ferrule of said cover which comes to rest on a mattress of fibrous material positioned in a peripheral groove provided on said side wall of the base.
  • dishes which promote the transfer of heat between the lower part of the cover and the outside.
  • these dishes are produced in the form of radial fins welded on the one hand to the lower ferrule of the cover and on the other hand to a flat flange pressing on a seal placed in a groove cooled by circulation of water located on the periphery of the base and on an annular ring carrying the seal which seals between the oven and the ambient atmosphere.
  • the bell oven comprises as known a fixed base 11, provided with a support plate 12 under which is placed the turbine 8 and on which the load rests consisting for example of one or more coils of cold-rolled or hot-rolled steel sheet 9.
  • This load is isolated from the ambient atmosphere using an inner cover 10 which rests on the base 11 with interposition sealing means which will be described below with reference to FIG. 2.
  • a semi-sealed barrier is produced between the capacity C of the cover 10 and the annular space A which separates the circular side wall 28 of the base 11 and the cover 10 (see FIG. 2).
  • this semi-sealed barrier is produced using a ring 22, preferably produced with an angle iron or with a tube welded to the lower end of a cylindrical internal ferrule 20 which is itself even welded on the lower part of the cover 10.
  • this cover 10 comprises a cylindrical shell 16 which is limited at its upper part by a bottom 18 which can be flat or curved and at its lower part by a ferrule frustoconical 19.
  • the cylindrical internal ferrule 20 which supports the ring is welded.
  • a peripheral groove 26 welded to the internal face of the side wall 28 of the base is provided with a mattress 24 of a fibrous material on which the ring 22 rests.
  • the ring 22-fibrous mattress system 24 constitutes a semi-sealed joint between the capacity C and the annular space A.
  • On the large base from the frusto-conical ferrule 19 of the cover is welded a cylindrical ferrule 36, the upper part of which is provided with an annular angle iron 38, facing outwards and on which an annular groove 40 receiving a seal 42 is welded outwards example in reinforced or unreinforced ceramic fiber.
  • the lower part 44 of the base of the oven 14 comes to rest partially on this seal 42 so as to create a seal between the high temperature atmosphere of the oven and the outside atmosphere.
  • the lower shell of the inner cover is lined with insulating materials 34 and 56. Furthermore, the annular space A separating the cover 10 from the side wall 28 of the base is at least partially lined with an insulating material 30 which is protected by a metal sheet 32 disposed outward. Thanks to this arrangement, avoids any thermal transfer by convention between the gases recirculated by the turbine 8 and the lower zones of the base and of the cover.
  • the mattress of insulating fibers 34, 56, disposed in the lower part of the cover 10 allows on the one hand to reduce the exchanges by radiation between the oven 14 and the lower part of the cover 10 and on the other hand to limit convection of hot gases from the oven between the lower zone of the latter and the lower part of the cover 10.
  • a flat flange 46 is welded on a lower part of the cylindrical shell 36 welded in the lower part of the frustoconical shell 19 of the cover 10.
  • This flange 46 comes to bear on a seal 48 which is positioned in a groove 50 cooled to using a water box 52 mounted on the periphery of the base.
  • the seal 48 can be a cylindrical O-ring but it is however preferable to use a seal of parallelepipedic section with large contact surface, which makes it possible to increase the machining tolerances of the flange 46 and of the groove carrying the seal. 50 without risk of loss of mechanical or elastic properties of the seal for reasons of overheating.
  • the seal 48 may have imprints of more or less complex shapes on its contact surface with the flange 46, so as to ensure by deformation of said imprints, a perfect distribution of the pressure exerted by the weight of the cover 10, this provision thus contributing to ensuring sealing. It is known that the pressure due to the weight of the cover can be supplemented by means of jacks placed around the base and exerting a closing pressure on the flange 46.
  • fins 54 are provided for dispersing the heat flux coming from the frustoconical ferrule 19 of the cover.
  • the fins 54 are arranged radially and they are welded on the one hand to the cylindrical lower ferrule 36 and on the other hand to the flat flange 46 and to the annular angle 38.
  • the arrangement described above makes it possible on the one hand to reduce the heat flux arriving at the level of the flat flange 46 and on the other hand to disperse this heat flux in the ambient atmosphere. A temperature of this flat flange is thus ensured at all speeds, which is significantly lower than the limit temperature for the use of the materials used to make the seal 48.
  • This arrangement therefore makes it possible to use in contact with the flange 46 a seal 48 formed elastomeric materials (rubber or plastic) without the need to insert it between two flanges or two water-cooled boxes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP89402210A 1988-08-04 1989-08-03 Haubenöfen, insbesondere zum Glühen von metallischen Coils in kontrollierter Atmosphäre Expired - Lifetime EP0354127B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89402210T ATE91012T1 (de) 1988-08-04 1989-08-03 Haubenoefen, insbesondere zum gluehen von metallischen coils in kontrollierter atmosphaere.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8810576A FR2635175B1 (fr) 1988-08-04 1988-08-04 Perfectionnements apportes aux fours cloche utilises notamment pour le recuit de bobines metalliques sous atmosphere controlee
FR8810576 1988-08-04

Publications (2)

Publication Number Publication Date
EP0354127A1 true EP0354127A1 (de) 1990-02-07
EP0354127B1 EP0354127B1 (de) 1993-06-23

Family

ID=9369132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402210A Expired - Lifetime EP0354127B1 (de) 1988-08-04 1989-08-03 Haubenöfen, insbesondere zum Glühen von metallischen Coils in kontrollierter Atmosphäre

Country Status (12)

Country Link
EP (1) EP0354127B1 (de)
JP (1) JP2810428B2 (de)
AR (1) AR247763A1 (de)
AT (1) ATE91012T1 (de)
CA (1) CA1335534C (de)
DD (1) DD287570A5 (de)
DE (2) DE68907289T2 (de)
ES (1) ES2012442T3 (de)
FR (1) FR2635175B1 (de)
GR (1) GR900300065T1 (de)
MX (1) MX171674B (de)
MY (1) MY104137A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2665756A1 (fr) * 1990-08-13 1992-02-14 Siderurgie Fse Inst Rech Dispositif d'etancheite entre une cuve et une voute flottante d'un four industriel tel qu'un four electrique de traitement de metal liquide.
EP2487441A3 (de) * 2005-07-21 2012-11-21 Hard Technologies Pty Ltd Duplexoberflächenbehandlung von Metallgegenständen
CN112182880A (zh) * 2020-09-27 2021-01-05 武汉钢铁有限公司 一种钢卷温度均匀性调整方法、装置、设备和介质

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2721070A (en) * 1954-03-12 1955-10-18 United States Steel Corp Two pass gas circulating separator
US3053523A (en) * 1959-06-08 1962-09-11 Inland Steel Co Inner cover for box annealing furnace
FR1552877A (de) * 1967-08-18 1969-01-10
US3438617A (en) * 1968-04-10 1969-04-15 Pullman Inc Atmospheric seals
US3563522A (en) * 1968-04-29 1971-02-16 Calvin C Blackman Sealing device
FR2268869A1 (de) * 1974-04-29 1975-11-21 Wilson Eng Co Inc Lee

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751219A (en) * 1971-10-28 1973-08-07 Steel Corp Annealing furnace seal
GB1390238A (en) * 1972-04-06 1975-04-09 Wellman Incandescent Furn Co Coil annealing furnaces
JPS59149962U (ja) * 1983-03-28 1984-10-06 川崎製鉄株式会社 バツチ焼鈍炉のシ−ル装置
JPS6118036U (ja) * 1984-07-05 1986-02-01 淳男 丸橋 水切りプレ−ト付水槽

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2721070A (en) * 1954-03-12 1955-10-18 United States Steel Corp Two pass gas circulating separator
US3053523A (en) * 1959-06-08 1962-09-11 Inland Steel Co Inner cover for box annealing furnace
FR1552877A (de) * 1967-08-18 1969-01-10
US3438617A (en) * 1968-04-10 1969-04-15 Pullman Inc Atmospheric seals
US3563522A (en) * 1968-04-29 1971-02-16 Calvin C Blackman Sealing device
FR2268869A1 (de) * 1974-04-29 1975-11-21 Wilson Eng Co Inc Lee

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2665756A1 (fr) * 1990-08-13 1992-02-14 Siderurgie Fse Inst Rech Dispositif d'etancheite entre une cuve et une voute flottante d'un four industriel tel qu'un four electrique de traitement de metal liquide.
EP2487441A3 (de) * 2005-07-21 2012-11-21 Hard Technologies Pty Ltd Duplexoberflächenbehandlung von Metallgegenständen
CN112182880A (zh) * 2020-09-27 2021-01-05 武汉钢铁有限公司 一种钢卷温度均匀性调整方法、装置、设备和介质
CN112182880B (zh) * 2020-09-27 2023-07-11 武汉钢铁有限公司 一种钢卷温度均匀性调整方法、装置、设备和介质

Also Published As

Publication number Publication date
DD287570A5 (de) 1991-02-28
JP2810428B2 (ja) 1998-10-15
JPH02138422A (ja) 1990-05-28
FR2635175B1 (fr) 1993-03-05
DE354127T1 (de) 1990-06-13
EP0354127B1 (de) 1993-06-23
MY104137A (en) 1994-02-28
DE68907289T2 (de) 1993-12-09
ES2012442A4 (es) 1990-04-01
ES2012442T3 (es) 1993-12-01
MX171674B (es) 1993-11-10
ATE91012T1 (de) 1993-07-15
FR2635175A1 (fr) 1990-02-09
GR900300065T1 (en) 1991-07-31
DE68907289D1 (de) 1993-07-29
AR247763A1 (es) 1995-03-31
CA1335534C (fr) 1995-05-16

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