EP0916741A1 - Furnaces with a rapid cooling of metal strips - Google Patents

Furnaces with a rapid cooling of metal strips Download PDF

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Publication number
EP0916741A1
EP0916741A1 EP98402476A EP98402476A EP0916741A1 EP 0916741 A1 EP0916741 A1 EP 0916741A1 EP 98402476 A EP98402476 A EP 98402476A EP 98402476 A EP98402476 A EP 98402476A EP 0916741 A1 EP0916741 A1 EP 0916741A1
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EP
European Patent Office
Prior art keywords
gas
event
actuators
recirculation
strip
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
EP98402476A
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German (de)
French (fr)
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EP0916741B1 (en
Inventor
Gérard Jodet
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Fives Stein SA
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Stein Heurtey SA
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
    • B05C3/125—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length the work being a web, band, strip or the like
    • 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
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • 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
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/12—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
    • F27B2009/124—Cooling
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D2021/0007—Monitoring the pressure
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D2021/0057—Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects
    • F27D2021/0092—Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects against a jam in the transport line or a production interruption

Definitions

  • the present invention relates to improvements made to rapid cooling for strip materials and more particularly for metal bands.
  • These ovens can be part of, in particular, treatments such as for example heat treatments of metallic products in strip, in particular for galvanizing, annealing, production of tinplate, etc.
  • the recycled atmospheric gas is blown onto the metal strip in continuous circulation, after cooling in particular using gas / water heat exchangers, the composition of the atmosphere, and more particularly its high hydrogen content, making it possible to obtain very rapid cooling rates of the order of 100 ° C. per second.
  • the installations therefore comprise a circuit of recirculation ducts for the atmosphere gas N 2 , H 2 , one or more fans for ensuring the continuous circulation of this atmospheric gas in the recirculation ducts and gas / water exchangers.
  • the present invention solves the problems mentioned above by providing means allowing, on the one hand, to prevent the passage of atmospheric gas through of the exchanger (s), i.e. too rapid cooling of this gas atmosphere, which prevents a sudden depression in the oven in case of breakage of the strip and on the other hand to stop, in a very short time, that is to say less than five seconds, recirculation of atmospheric gas into the cooling chamber fast, during a wave break in a compensator or during a power outage power supply.
  • the actuators preferably tires, are triggered by a sensor detecting any variation of the belt tension.
  • the actuators are triggered via a sensor detecting any variation in pressure in the rapid cooling chamber.
  • means are furthermore designed and produced to so as to allow the rotation of the fan (s) to be stopped in a very short time, these means can be achieved by coupling the fan to a generator on which it is engaged either in the event of a wave break in a compensator, or in the event of power cut.
  • This oven or chamber cooling is generally part of an installation comprising a plurality of strip material processing stations, this installation being for example of the type described in EP-0 795 616 mentioned above.
  • the metal strip 12 circulates continuously, this strip coming in general of other treatment enclosures for example heat treatments, maintenance, annealing, etc.
  • Rapid cooling is obtained by spraying the strip 12, in continuous circulation, with a jet of gas of atmosphere N 2 , H 2 , containing, as explained above, a large proportion of hydrogen, greater than 15% and up to 50%.
  • This atmospheric gas is projected onto the lateral faces of the strip 12 by means of nozzles such as 14 supplied by sheaths such as 16 and it is taken up using sheaths such as 18 which open parallel to the plane of the strip 12 in the rapid cooling chamber 10.
  • the circulation of atmospheric gas is obtained using a fan such as 20, driven by an electric motor 22, the blowing of atmospheric gas being carried out by by means of a collecting sheath 24 supplying the sheaths 14 while the recovery of this atmosphere gas is carried out by means of the collecting sheaths 26, 26 ′ supplied by the sheaths 18.
  • the installation also comprises, in a known manner, exchangers 28, 28 ', of preferably gas / water type which are housed in enclosures designated in their together by the reference 32, respectively 32 ', on which the ducts 26, 26 'for atmospheric gas, in order to cool the latter, after circulation in the rapid cooling chamber 10 and before recovery by the fan 20 and blowing through ducts 24 and 16.
  • exchangers 28, 28 ' of preferably gas / water type which are housed in enclosures designated in their together by the reference 32, respectively 32 ', on which the ducts 26, 26 'for atmospheric gas, in order to cool the latter, after circulation in the rapid cooling chamber 10 and before recovery by the fan 20 and blowing through ducts 24 and 16.
  • the various sheaths 16, 18, 24, 26, 26 'in include compensators 30, produced in the form of a series of waves allowing the assembly sheaths to expand.
  • FIGS 3 and 4 schematically illustrate the improvements brought about by the invention.
  • FIGs 3 and 4 respectively represent in plan and in section, an enclosure, such as 32 or 32 '( Figures 1 and 2) receiving a heat exchanger such as 28, 28 'in Figures 1 and 2.
  • the direction of recirculation of the cooling gas has been represented by arrow F, this gas coming from the ducts 18 being sucked through the sheath 26, by the fan 20.
  • the passage to through the exchanger 28 is effected by the section of the enclosure designated by the reference A, this section being described below as the main passage section.
  • this main passage section A comprises, upstream of the exchanger 28, a register shown schematically at 34 and provision is made for derived passage sections, designated by the references B also provided with registers such as 36, 36 'through which the circulation flow of the cooling gas, so that it no longer passes through exchangers such as 28, 28 ', as will be explained below (arrows f).
  • the different registers 34, 36, 36 ' are controlled by actuators, preferably of the pneumatic type, such as 38, 38 ' having a very short response time, that is to say less than 5 seconds.
  • the triggering of these actuators allows either to interrupt the circulation of the cooling gas through the section of main passage A, i.e. through exchangers such as 28, 28 'and divert this circulation through branch sections B (register 34 closed and registers 36, 36 'open) or, to interrupt all circulation of the gas from cooling through passage sections A and B (registers 34, 36, 36 ' closed).
  • the first phenomenon that is to say a break in the strip
  • a tape tension sensor any variation of this voltage from a setpoint causing the tripping of actuators controlling the closing of the main passage section A and the opening of the branch passage sections B.
  • a pressure sensor positioned for example in the rapid cooling 10, any vacuum detection in this chamber immediately driving the actuators as mentioned above.
  • the latter can also be used to detect a wave break in a compensator 30 in order to immediately trigger the closing of the section of passage A, the derived sections B being kept closed as indicated in the table above.
  • any conventional means can be used to control the actuators 38 in power supply interruptions, including switches tripping by power failure or fault in order to cause a immediate closure of the main passage section A, the passage sections derivative B remaining closed.
  • the present invention it is also possible to provide means allowing to stop in a very short time, the rotation of the fan 20 for example by coupling it to a generator to which it is engaged either in the event of a wave break a compensator 30, ie in the event of a power cut.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

Ce four apporte des moyens de refroidissement rapide par projection sur la bande d'un jet de gaz d'atmosphère, la recirculation de ce gaz étant assurée par un circuit de gaines de recirculation comportant au moins un ventilateur et un échangeur et il est caractérisé en ce que l'enceinte (32) dans laquelle sont logés lesdits échangeurs (28) et sur laquelle débouchent les gaines de recirculation (18) du gaz d'atmosphère comporte une section de passage principal (A) par laquelle s'effectue la circulation du gaz de refroidissement au travers desdits échangeurs, cette section (A) étant munie d'un registre (34) en amont des échangeurs du ou desdits échangeurs ; des sections de passage dérivé (B) , déviant le flux du gaz de refroidissement en cas de fermeture de la section (A), pour que ce flux ne traverse pas lesdits échangeurs, lesdites sections (B) étant munies de registres (36, 36') et, des actionneurs (38, 38'), à temps de réponse très court, qui sont déclenchés par des moyens de détection de la rupture de la bande ou d'une onde de compensateur et en cas de coupure de l'alimentation électrique. <IMAGE>This oven provides rapid cooling means by spraying onto the strip a jet of atmosphere gas, the recirculation of this gas being ensured by a circuit of recirculation ducts comprising at least one fan and one exchanger and it is characterized in that the enclosure (32) in which the said exchangers (28) are housed and on which the recirculation ducts (18) of the atmospheric gas open has a main passage section (A) through which the circulation of the cooling gas through said exchangers, this section (A) being provided with a register (34) upstream of the exchangers of said exchanger (s); bypass passage sections (B), deflecting the flow of cooling gas in the event of section (A) closing, so that this flow does not pass through said exchangers, said sections (B) being provided with registers (36, 36 ') and, actuators (38, 38'), with a very short response time, which are triggered by means of detection of the rupture of the strip or of a compensator wave and in the event of a power failure electric. <IMAGE>

Description

La présente invention concerne des perfectionnements apportés aux fours de refroidissement rapide pour matériaux en bande et plus particulièrement pour des bandes métalliques. Ces fours peuvent faire partie notamment d'installations de traitements tels que par exemple traitements thermiques de produits métalliques en bande, notamment de galvanisation, de recuit, de production de fer blanc, etc.The present invention relates to improvements made to rapid cooling for strip materials and more particularly for metal bands. These ovens can be part of, in particular, treatments such as for example heat treatments of metallic products in strip, in particular for galvanizing, annealing, production of tinplate, etc.

On connaít (EP-A-0 795 616) des installations destinées au traitement thermique de bandes métalliques en continu dans lesquelles la bande à traiter chemine au travers d'un four constitué d'une pluralité de sections de traitement thermique notamment de chauffage, de maintien, de recuit, de refroidissement, etc... Dans cette publication, la présente titulaire a préconisé l'utilisation d'enceintes, ou de chambre, de chauffage et/ou de refroidissement dans lesquelles règne une atmosphère constituée d'un mélange de gaz, à base d'hydrogène dont la teneur en hydrogène est supérieure aux valeurs habituellement admises, afin d'augmenter la vitesse de refroidissement. Ainsi, selon cette technique antérieure, on peut utiliser comme atmosphère dans l'enceinte de refroidissement, un mélange de gaz, notamment d'azote et d'hydrogène, présentant une teneur en hydrogène supérieure à 15% et pouvant atteindre 50%, c'est-à-dire supérieure à la valeur de limite d'explositivté de ce gaz.We know (EP-A-0 795 616) of installations intended for the heat treatment of continuous metal strips in which the strip to be treated travels through an oven consisting of a plurality of heat treatment sections, in particular of heating, holding, annealing, cooling, etc. In this publication, the present holder recommended the use of heating chambers, or rooms and / or cooling in which an atmosphere consisting of a gas mixture, hydrogen-based with a hydrogen content higher than usually accepted values, in order to increase the cooling rate. So, according to this prior technique, it is possible to use as an atmosphere in the enclosure cooling, a mixture of gases, in particular nitrogen and hydrogen, having a hydrogen content greater than 15% and up to 50%, that is to say greater than the explosivity limit value of this gas.

Dans l'enceinte de refroidissement des installations mentionnées ci-dessus, le gaz d'atmosphère recyclé est soufflé sur la bande métallique en circulation continue, après refroidissement notamment à l'aide d'échangeurs thermiques gaz/eau, la composition du gaz d'atmosphère, et plus particulièrement sa forte teneur en hydrogène, permettant d'obtenir des vitesses de refroidissement très rapides de l'ordre de 100°C par seconde. Les installations comportent donc un circuit de gaines de recirculation du gaz d'atmosphère N2, H2 , un ou plusieurs ventilateurs pour assurer la circulation continue de ce gaz d'atmosphère dans les gaines de recirculation et des échangeurs gaz/eau. In the cooling enclosure of the above-mentioned installations, the recycled atmospheric gas is blown onto the metal strip in continuous circulation, after cooling in particular using gas / water heat exchangers, the composition of the atmosphere, and more particularly its high hydrogen content, making it possible to obtain very rapid cooling rates of the order of 100 ° C. per second. The installations therefore comprise a circuit of recirculation ducts for the atmosphere gas N 2 , H 2 , one or more fans for ensuring the continuous circulation of this atmospheric gas in the recirculation ducts and gas / water exchangers.

Compte-tenu de la teneur très importante en hydrogène du gaz d'atmosphère utilisé lors du refroidissement rapide, on est amené à prendre de grandes précautions pour assurer la sécurité de l'installation ; en effet on ne peut pas tolérer une fuite, aussi minime soit-elle, du gaz d'atmosphère dans l'environnement.In view of the very high hydrogen content of the atmospheric gas used during rapid cooling, it is necessary to take great precautions to ensure the security of the installation; you cannot tolerate a leak, too minimal as it is, atmospheric gas in the environment.

La présente invention se propose d'apporter une solution à ce problème de sécurité notamment en tenant compte des trois phénomènes principaux suivants qui sont nuisibles à cette sécurité:

  • 1) Il peut arriver que la bande se casse à l'intérieur du four et plus particulièrement dans la chambre de refroidissement rapide. Dans ce cas, il se produit une contraction du gaz d'atmosphère qui est directement provoquée par l'arrêt de l'apport en calories par la bande et la continuité de l'échange gaz/eau au travers du ou des échangeurs. Ce phénomène de contraction du gaz d'atmosphère entraíne une dépression brutale dans la chambre de refroidissement rapide et dans le four ;
  • 2) L'ensemble des gaines de circulation du gaz d'atmosphère comporte des compensateurs qui permettent aux gaines de se dilater. Dans le cas d'une rupture d'onde d'un compensateur, il est absolument nécessaire d'empêcher l'introduction d'air à l'intérieur du circuit de recirculation du gaz d'atmosphère ou toute fuite de ce dernier vers l'environnement et,
  • 3) Lors d'une coupure de l'alimentation électrique de l'installation ou d'une panne générale du secteur d'alimentation de l'usine où est située cette installation, il est nécessaire d'arrêter immédiatement la recirculation du gaz d'atmosphère.
    • The present invention proposes to provide a solution to this security problem in particular by taking into account the following three main phenomena which are detrimental to this security:
  • 1) It may happen that the strip breaks inside the oven and more particularly in the rapid cooling chamber. In this case, there is a contraction of the atmospheric gas which is directly caused by the stopping of the supply of calories by the strip and the continuity of the gas / water exchange through the exchanger or exchangers. This phenomenon of contraction of the atmosphere gas causes a brutal depression in the rapid cooling chamber and in the oven;
  • 2) All of the atmospheric gas circulation ducts include compensators which allow the ducts to expand. In the event of a wave break in a compensator, it is absolutely necessary to prevent the introduction of air inside the recirculation circuit of atmospheric gas or any leakage of the latter towards the environment and,
  • 3) In the event of a cut in the electrical supply to the installation or a general breakdown in the supply sector of the plant where this installation is located, it is necessary to immediately stop the recirculation of the gas atmosphere.

    • La présente invention résoud les problèmes mentionnés ci-dessus en apportant des moyens permettant d'une part, d'empêcher le passage du gaz d'atmosphère au travers du ou des échangeurs, c'est-à-dire un refroidissement trop rapide de ce gaz d'atmosphère, ce qui évite une dépression brutale dans le four en cas de cassure de la bande et d'autre part de stopper, en un temps très court, c'est-à-dire inférieur à cinq secondes, la recirculation du gaz d'atmosphère dans la chambre de refroidissement rapide, lors d'une rupture d'ondes d'un compensateur ou lors d'une coupure de l'alimentation électrique.The present invention solves the problems mentioned above by providing means allowing, on the one hand, to prevent the passage of atmospheric gas through of the exchanger (s), i.e. too rapid cooling of this gas atmosphere, which prevents a sudden depression in the oven in case of breakage of the strip and on the other hand to stop, in a very short time, that is to say less than five seconds, recirculation of atmospheric gas into the cooling chamber fast, during a wave break in a compensator or during a power outage power supply.

    En conséquence, la présente invention concerne un four à refroidissement rapide, pouvant faire partie d'une installation comportant divers postes de traitement, notamment de traitement thermique de produits en bande, dans lequel circule en continu une bande métallique, le refroidissement rapide étant obtenu par projection sur la bande d'un jet de gaz d'atmosphère constitué d'un mélange d'azote et d'hydrogène présentant une teneur en hydrogène supérieure à 15%, et de préférence voisine de 50%, la recirculation du gaz d'atmosphère étant assurée à l'aide d'un circuit de gaines de recirculation comportant au moins un ventilateur ainsi qu'au moins un échangeur gaz/eau, les différentes gaines comportant des compensateurs réalisés sous la forme d'une série d'ondes permettant à l'ensemble des gaines de se dilater, ce four étant caractérisé en ce que l'enceinte dans laquelle sont logés le ou lesdits échangeurs et sur laquelle débouchent les gaines de recirculation du gaz d'atmosphère comporte :

    • une section de passage principal par laquelle s'effectue la circulation du gaz de refroidissement au travers desdits échangeurs, cette section de passage étant munie d'un registre en amont du ou desdits échangeurs ;
    • des sections de passage dérivé, permettant de dévier le flux du gaz de refroidissement en cas de fermeture de la section de passage principal, pour que ce flux ne traverse pas le ou lesdits échangeurs, lesdites sections de passage dérivé étant munies de registres et,
    • des actionneurs, à temps de réponse très court, c'est-à-dire inférieurs à cinq secondes, ces derniers étant déclenchés par l'intermédiaire de moyens de détection de la rupture de la bande, de la rupture d'une onde de compensateur et d'une coupure de l'alimentation électrique.
    Consequently, the present invention relates to a rapid cooling oven, which can be part of an installation comprising various treatment stations, in particular for thermal treatment of strip products, in which a metal strip circulates continuously, rapid cooling being obtained by recirculation of atmospheric gas onto the strip of a jet of atmosphere gas consisting of a mixture of nitrogen and hydrogen having a hydrogen content greater than 15%, and preferably close to 50% being provided using a recirculation duct circuit comprising at least one fan as well as at least one gas / water exchanger, the various ducts comprising compensators produced in the form of a series of waves allowing the '' all the ducts to expand, this oven being characterized in that the enclosure in which the said exchanger (s) are housed and on which the recirculation ducts open atmospheric gas includes:
    • a main passage section through which the cooling gas flows through said exchangers, this passage section being provided with a register upstream of said exchanger (s);
    • bypass sections, allowing the flow of the cooling gas to be diverted in the event of the main passage section being closed, so that this flow does not pass through said exchanger (s), said bypass sections being provided with registers and,
    • actuators, with a very short response time, that is to say less than five seconds, the latter being triggered by means of detection of the rupture of the strip, of the rupture of a compensator wave and a power cut.

    Selon un mode de réalisation de l'invention, les actionneurs, de préférence pneumatiques, sont déclenchés par l'intermédiaire d'un capteur détectant toute variation de la tension de la bande. According to one embodiment of the invention, the actuators, preferably tires, are triggered by a sensor detecting any variation of the belt tension.

    Selon un autre mode de réalisation de cette invention, les actionneurs sont déclenchés par l'intermédiaire d'un capteur détectant toute variation de la pression dans la chambre de refroidissement rapide.According to another embodiment of this invention, the actuators are triggered via a sensor detecting any variation in pressure in the rapid cooling chamber.

    Selon la présente invention, on prévoit en outre des moyens conçus et réalisés de manière à permettre d'arrêter en un temps très court la rotation du ou des ventilateurs, ces moyens pouvant être réalisés en couplant le ventilateur à un générateur sur lequel il est embrayé soit en cas de rupture d'onde d'un compensateur, soit en cas de coupure de l'alimentation électrique.According to the present invention, means are furthermore designed and produced to so as to allow the rotation of the fan (s) to be stopped in a very short time, these means can be achieved by coupling the fan to a generator on which it is engaged either in the event of a wave break in a compensator, or in the event of power cut.

    D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après en référence aux dessins annexés qui en illustrent un mode de réalisation donné uniquement à titre d'exemple.Other characteristics and advantages of the present invention will emerge from the description given below with reference to the accompanying drawings which illustrate a mode thereof of realization given only by way of example.

    Sur les dessins :

    • Les figures 1 et 2 sont des vues en perspective illustrant un exemple de réalisation d'un four de refroidissement rapide avec ses gaines de souflage et de recirculation du gaz d'atmosphère.
    • La figure 3 est une vue en plan, schématique illustrant les perfectionnements apportés par la présente invention et,
    • La figure 4 est une coupe selon IV-IV de la figure 3.
    In the drawings:
    • Figures 1 and 2 are perspective views illustrating an exemplary embodiment of a rapid cooling oven with its blowing ducts and recirculation of atmospheric gas.
    • FIG. 3 is a schematic plan view illustrating the improvements made by the present invention and,
    • Figure 4 is a section on IV-IV of Figure 3.

    En se référant aux figures 1 et 2, on y voit une vue d'ensemble d'un four de refroidissement rapide auquel s'applique la présente invention. Ce four ou chambre de refroidissement fait en général partie d'une installation comportant une pluralité de postes de traitement de matériau en bande, cette installation pouvant être par exemple du type décrit dans EP-0 795 616 mentionné ci-dessus. Dans ce four désigné par la référence 10, circule en continu la bande métallique 12, cette bande provenant en général d'autres enceintes de traitement par exemple de traitements thermiques, de maintien, de recuit, etc.Referring to Figures 1 and 2, there is an overview of a furnace rapid cooling to which the present invention applies. This oven or chamber cooling is generally part of an installation comprising a plurality of strip material processing stations, this installation being for example of the type described in EP-0 795 616 mentioned above. In this oven designated by the reference 10, the metal strip 12 circulates continuously, this strip coming in general of other treatment enclosures for example heat treatments, maintenance, annealing, etc.

    Le refroidissement rapide est obtenu par projection sur la bande 12, en circulation continue, d'un jet de gaz d'atmosphère N2, H2 , contenant ainsi qu'on l'a expliqué ci-dessus une proportion importante d'hydrogène, supérieure à 15% et pouvant aller jusqu'à 50%. Ce gaz d'atmosphère est projeté sur les faces latérales de la bande 12 par l'intermédiaire de buses telles que 14 alimentées par des gaines telles que 16 et il est repris à l'aide de gaines telles que 18 qui débouchent parallèlement au plan de la bande 12 dans la chambre de refroidissement rapide 10. La circulation du gaz d'atmosphère est obtenue à l'aide d'un ventilateur tel que 20, entraíné par un moteur électrique 22, le soufflage du gaz d'atmosphère s'effectuant par l'intermédiaire d'une gaine collectrice 24 alimentant les gaines 14 alors que la reprise de ce gaz d'atmosphère est réalisée par l'intermédiaire des gaines collectrices 26, 26' alimentées par les gaines 18.Rapid cooling is obtained by spraying the strip 12, in continuous circulation, with a jet of gas of atmosphere N 2 , H 2 , containing, as explained above, a large proportion of hydrogen, greater than 15% and up to 50%. This atmospheric gas is projected onto the lateral faces of the strip 12 by means of nozzles such as 14 supplied by sheaths such as 16 and it is taken up using sheaths such as 18 which open parallel to the plane of the strip 12 in the rapid cooling chamber 10. The circulation of atmospheric gas is obtained using a fan such as 20, driven by an electric motor 22, the blowing of atmospheric gas being carried out by by means of a collecting sheath 24 supplying the sheaths 14 while the recovery of this atmosphere gas is carried out by means of the collecting sheaths 26, 26 ′ supplied by the sheaths 18.

    L'installation comporte en outre, de manière connue, des échangeurs 28, 28', de préférence du type gaz/eau qui sont logés dans des enceintes désignées dans leur ensemble par la référence 32, respectivement 32', sur lesquelles débouchent les gaines de reprise 26, 26' du gaz d'atmosphère, afin de refroidir ce dernier, après circulation dans la chambre de refroidissement rapide 10 et avant reprise par le ventilateur 20 et soufflage au-travers des gaines 24 et 16. Selon une construction également connue, les différentes gaines 16, 18, 24, 26, 26' comportent des compensateurs 30, réalisés sous la forme d'une série d'ondes permettant à l'ensemble des gaines de se dilater.The installation also comprises, in a known manner, exchangers 28, 28 ', of preferably gas / water type which are housed in enclosures designated in their together by the reference 32, respectively 32 ', on which the ducts 26, 26 'for atmospheric gas, in order to cool the latter, after circulation in the rapid cooling chamber 10 and before recovery by the fan 20 and blowing through ducts 24 and 16. According to a construction also known, the various sheaths 16, 18, 24, 26, 26 'include compensators 30, produced in the form of a series of waves allowing the assembly sheaths to expand.

    On se réfère maintenant aux figures 3 et 4 qui illustrent de façon schématique les perfectionnements apportés par l'invention. Ces figures représentent respectivement en plan et en coupe, une enceinte, telle que 32 ou 32' (figures 1 et 2) recevant un échangeur thermique tel que 28, 28' sur les figures 1 et 2. Le sens de recirculation du gaz de refroidissement a été représenté par la flèche F, ce gaz provenant des gaines 18 étant aspiré au travers de la gaine 26, par le ventilateur 20. Le passage au travers de l'échangeur 28 s'effectue par la section de l'enceinte désignée par la référence A, cette section étant qualifiée ci-après de section de passage principal.We now refer to Figures 3 and 4 which schematically illustrate the improvements brought about by the invention. These figures respectively represent in plan and in section, an enclosure, such as 32 or 32 '(Figures 1 and 2) receiving a heat exchanger such as 28, 28 'in Figures 1 and 2. The direction of recirculation of the cooling gas has been represented by arrow F, this gas coming from the ducts 18 being sucked through the sheath 26, by the fan 20. The passage to through the exchanger 28 is effected by the section of the enclosure designated by the reference A, this section being described below as the main passage section.

    Selon la présente invention, cette section de passage principal A comporte, en amont de l'échangeur 28, un registre représenté schématiquement en 34 et l'on prévoit des sections de passage dérivé, désignées par les références B également pourvues de registres tels que 36, 36' au travers desquelles peut être dévié le flux de circulation du gaz de refroidissement, pour qu'il ne traverse plus les échangeurs tels que 28, 28', ainsi qu'on l'expliquera ci-après (flèches f). Les différents registres 34, 36, 36' sont commandés par des actionneurs, de préférence du type pneumatique, tels que 38, 38' présentant un temps de réponse très court, c'est-à-dire inférieur à 5 secondes.According to the present invention, this main passage section A comprises, upstream of the exchanger 28, a register shown schematically at 34 and provision is made for derived passage sections, designated by the references B also provided with registers such as 36, 36 'through which the circulation flow of the cooling gas, so that it no longer passes through exchangers such as 28, 28 ', as will be explained below (arrows f). The different registers 34, 36, 36 'are controlled by actuators, preferably of the pneumatic type, such as 38, 38 ' having a very short response time, that is to say less than 5 seconds.

    Le déclenchement de ces actionneurs, comme on l'expliquera ci-après, permet soit d'interrompre la circulation du gaz de refroidissement au travers de la section de passage principal A, c'est-à-dire au travers des échangeurs tels que 28, 28' et de dévier cette circulation au travers des sections de passage dérivé B (registre 34 fermé et registres 36, 36' ouverts) soit, d'interrompre toute circulation du gaz de refroidissement au travers des sections de passage A et B (registres 34, 36, 36' fermés).The triggering of these actuators, as will be explained below, allows either to interrupt the circulation of the cooling gas through the section of main passage A, i.e. through exchangers such as 28, 28 'and divert this circulation through branch sections B (register 34 closed and registers 36, 36 'open) or, to interrupt all circulation of the gas from cooling through passage sections A and B (registers 34, 36, 36 ' closed).

    En se référant aux trois phénomènes, ou incidents de fonctionnement explicités ci-dessus, on peut dresser le tableau ci-après résumant les différents modes de fonctionnement. DESIGNATION SENS DE PASSAGE DU GAZ DE REFROIDISSEMENT Section de passage B A B cas de marche normale Fermé Ouvert Fermé Cas du premier phénomène Déclenchement de l'ouverture des registres 36, 36' Déclenchement de la fermeture du registre 34 Déclenchement de l'ouverture des registres 36, 36' Cas du deuxième phénomène Fermé Déclenchement de la fermeture du registre 34 Fermé Cas du troisième phénomène Fermé Déclenchement de la fermeture du registre 34 Fermé Referring to the three phenomena, or operating incidents explained above, we can draw up the table below summarizing the different operating modes. DESIGNATION DIRECTION OF COOLING GAS Passage section B AT B normal walking case Closed Open Closed Case of the first phenomenon Trigger opening of registers 36, 36 ' Trigger to close the register 34 Trigger opening of registers 36, 36 ' Case of the second phenomenon Closed Trigger to close the register 34 Closed Case of the third phenomenon Closed Trigger to close the register 34 Closed

    Selon l'invention, le premier phénomène, c'est-à-dire une cassure de la bande peut être détecté à l'aide d'un capteur de mesure de la tension de la bande, toute variation de cette tension à partir d'une valeur de consigne entraínant le déclenchement des actionneurs commandant la fermeture de la section de passage principal A et l'ouverture des sections de passage dérivé B. On peut également, dans le même but, prévoir un capteur de pression, positionné par exemple dans la chambre de refroidissement rapide 10, toute détection de dépression dans cette chambre entraínant immédiatement la commande des actionneurs comme mentionné ci-dessus. On peut utiliser également ce dernier moyen pour détecter une rupture d'onde d'un compensateur 30 afin de déclencher immédiatement la fermeture de la section de passage A, les sections dérivées B étant maintenues fermées comme indiqué dans le tableau ci-dessus.According to the invention, the first phenomenon, that is to say a break in the strip, can be detected using a tape tension sensor, any variation of this voltage from a setpoint causing the tripping of actuators controlling the closing of the main passage section A and the opening of the branch passage sections B. It is also possible, for the same purpose, provide a pressure sensor, positioned for example in the rapid cooling 10, any vacuum detection in this chamber immediately driving the actuators as mentioned above. The latter can also be used to detect a wave break in a compensator 30 in order to immediately trigger the closing of the section of passage A, the derived sections B being kept closed as indicated in the table above.

    Enfin, on peut utiliser tout moyen classique pour commander les actionneurs 38 en cas d'interruption de l'alimentation électrique, notamment des commutateurs à déclenchement par coupure ou défaut de courant de manière à provoquer une fermeture immédiate de la section de passage principal A, les sections de passage dérivé B restant fermées.Finally, any conventional means can be used to control the actuators 38 in power supply interruptions, including switches tripping by power failure or fault in order to cause a immediate closure of the main passage section A, the passage sections derivative B remaining closed.

    Selon la présente invention, on peut également prévoir des moyens permettant d'arrêter en un temps très court, la rotation du ventilateur 20 par exemple en l'accouplant à un générateur sur lequel il est embrayé soit en cas d'une rupture d'onde d'un compensateur 30, soit en cas de coupure de l'alimentation électrique.According to the present invention, it is also possible to provide means allowing to stop in a very short time, the rotation of the fan 20 for example by coupling it to a generator to which it is engaged either in the event of a wave break a compensator 30, ie in the event of a power cut.

    On notera que le dispositif objet de l'invention permet notamment :

    • de ne pas augmenter les pertes de charges du circuit de recirculation du gaz de refroidissement ;
    • de ne pas perturber le flux gazeux au travers de l'échangeur 28 durant la marche normale et,
    • de ne pas gêner le bon fonctionnement du ventilateur.
    It will be noted that the device which is the subject of the invention allows in particular:
    • not to increase the pressure losses of the cooling gas recirculation circuit;
    • not to disturb the gas flow through the exchanger 28 during normal operation and,
    • not to interfere with the proper functioning of the fan.

    Il demeure bien entendu que la présente invention n'est pas limitée aux exemples de réalisation décrits et/ou représentés mais qu'elle en englobe toutes les variantes qui entrent dans le cadre de la portée des revendications annexées.It remains to be understood that the present invention is not limited to the examples of realization described and / or represented but that it includes all the variants which fall within the scope of the appended claims.

    Claims (7)

    Four à refroidissement rapide, pouvant faire partie d'une installation comportant divers postes de traitement, notamment de traitement thermique de produits en bande, dans lequel circule en continu une bande métallique (12), le refroidissement rapide étant obtenu par projection sur la bande d'un jet de gaz d'atmosphère constitué d'un mélange d'azote et d'hydrogène présentant une teneur en hydrogène supérieure à 15%, et de préférence voisine de 50%, la recirculation du gaz d'atmosphère étant assurée à l'aide d'un circuit de gaines de recirculation (16, 18, 26, 26', 24) comportant au moins un ventilateur (20) ainsi qu'au moins un échangeur gaz/eau (28, 28') les différentes gaines comportant des compensateurs (30) réalisés sous la forme d'une série d'ondes permettant à l'ensemble des gaines de se dilater, ce four (10) étant caractérisé en ce que l'enceinte (32, 32') dans laquelle sont logés le ou lesdits échangeurs (28, 28') et sur laquelle débouchent les gaines de recirculation (16, 18, 26, 26', 24) du gaz d'atmosphère comporte : une section de passage principal (A) par laquelle s'effectue la circulation du gaz de refroidissement au travers desdits échangeurs, cette section de passage (A) étant munie d'un registre (34) en amont du ou desdits échangeurs ; des sections de passage dérivé (B) , permettant de dévier le flux du gaz de refroidissement en cas de fermeture de la section de passage principal (A), pour que ce flux ne traverse pas le ou lesdits échangeurs, lesdites sections de passage dérivé étant munies de registres (36, 36') et, des actionneurs (38, 38') , à temps de réponse très court, c'est-à-dire inférieur à cinq secondes, ces derniers étant déclenchés par l'intermédiaire de moyens de détection de la rupture de la bande, de la rupture d'une onde de compensateur et d'une coupure de l'alimentation électrique Rapid cooling furnace, which can be part of an installation comprising various treatment stations, in particular for heat treatment of products in strips, in which a metal strip (12) circulates continuously, rapid cooling being obtained by spraying onto the strip d 'A jet of atmosphere gas consisting of a mixture of nitrogen and hydrogen having a hydrogen content greater than 15%, and preferably close to 50%, the recirculation of atmosphere gas being ensured by using a recirculation duct circuit (16, 18, 26, 26 ', 24) comprising at least one fan (20) as well as at least one gas / water exchanger (28, 28'), the various ducts comprising compensators (30) produced in the form of a series of waves allowing all the sheaths to expand, this oven (10) being characterized in that the enclosure (32, 32 ') in which the or said exchangers (28, 28 ') and on which the gains lead recirculation (16, 18, 26, 26 ', 24) of the atmospheric gas comprises: a main passage section (A) through which the cooling gas flows through said exchangers, this passage section (A) being provided with a register (34) upstream of said exchanger (s); branch passage sections (B), allowing the flow of the cooling gas to be deflected in the event of the main passage section (A) being closed, so that this flow does not pass through said exchanger (s), said branch passage sections being provided with registers (36, 36 ') and, actuators (38, 38 '), with a very short response time, that is to say less than five seconds, the latter being triggered by means of detection of the rupture of the strip, of the rupture a compensator wave and a power cut Four selon la revendication 1 caractérisé en ce que lesdits actionneurs (38, 38') , de préférence du type pneumatique, sont déclenchés par l'intermédiaire d'un capteur détectant toute variation de la tension de la bande. Oven according to claim 1 characterized in that said actuators (38, 38 '), preferably pneumatic type, are triggered by a sensor detecting any variation in belt tension. Four selon la revendication 1 caractérisé en ce que lesdits actionneurs (38, 38') sont déclenchés par l'intermédiaire d'un capteur détectant toute variation de la pression dans la chambre de refroidissement rapide (10).Oven according to claim 1 characterized in that said actuators (38, 38 ') are triggered by a sensor detecting any variation in the pressure in the rapid cooling chamber (10). Four selon la revendication 1 caractérisé en ce que l'on prévoit des moyens pour déclencher les actionneurs (38) commandant le registre (34) prévu sur la section de passage principal (A) en cas d'interruption de l'alimentation électrique, de manière à provoquer une fermeture immédiate de ladite section de passage principal, les sections de passage dérivé (B) restant fermées.Oven according to claim 1 characterized in that means are provided for trigger the actuators (38) controlling the damper (34) provided on the section of main passage (A) in the event of an interruption in the power supply, so that cause immediate closure of said main passage section, the sections of derivative passage (B) remaining closed. Four selon la revendication 4 caractérisé en ce que lesdits moyens pour déclencher les actionneurs (38) en cas d'interruption de l'alimentation électrique sont réalisés sous la forme de commutateurs à déclenchement par coupure ou défaut de courant.Oven according to claim 4 characterized in that said means for triggering the actuators (38) in the event of an interruption of the electrical supply are produced under the form of switches triggered by a power cut or fault. Four selon l'une quelconque des revendications précédentes caractérisé en ce que l'on prévoit des moyens permettant d'arrêter dans un temps très court, la rotation du ventilateur (20).Oven according to any one of the preceding claims, characterized in that means are provided to stop in a very short time, the rotation of the fan (20). Four selon la revendication 6 caractérisé en ce que lesdits moyens permettant d'arrêter la rotation du ventilateur (20) en un temps très court consistent à l'accoupler à un générateur sur lequel il est embrayé soit en cas d'une rupture d'onde d'un compensateur 30, soit en cas de coupure de l'alimentation électrique.Oven according to claim 6 characterized in that said means allowing to stop the rotation of the fan (20) in a very short time consists in couple it to a generator to which it is engaged either in the event of a wave break a compensator 30, ie in the event of a power cut.
    EP98402476A 1997-10-15 1998-10-06 Furnaces with a rapid cooling of metal strips Expired - Lifetime EP0916741B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9712906A FR2769695B1 (en) 1997-10-15 1997-10-15 IMPROVEMENTS IN QUICK COOLING OVENS FOR METAL STRIPS
    FR9712906 1997-10-15

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    EP0916741A1 true EP0916741A1 (en) 1999-05-19
    EP0916741B1 EP0916741B1 (en) 2002-01-16

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    EP (1) EP0916741B1 (en)
    JP (1) JP3323820B2 (en)
    KR (1) KR100581983B1 (en)
    CN (1) CN1088113C (en)
    AT (1) ATE212071T1 (en)
    DE (2) DE69803157T2 (en)
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    CN103074480A (en) * 2011-10-26 2013-05-01 苏州新长光热能科技有限公司 Controllable internal circulation cooling system used in heat treatment furnace

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    EP0182050A2 (en) * 1984-11-14 1986-05-28 Nippon Steel Corporation Strip cooling apparatus for continuous annealing furnace
    US5137586A (en) * 1991-01-02 1992-08-11 Klink James H Method for continuous annealing of metal strips

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    ES2131493T1 (en) 1999-08-01
    ES2131493T3 (en) 2002-05-01
    ATE212071T1 (en) 2002-02-15
    KR100581983B1 (en) 2006-09-27
    CN1088113C (en) 2002-07-24
    EP0916741B1 (en) 2002-01-16
    JP3323820B2 (en) 2002-09-09
    JPH11193422A (en) 1999-07-21
    CN1216323A (en) 1999-05-12
    DE69803157D1 (en) 2002-02-21
    FR2769695A1 (en) 1999-04-16
    DE69803157T2 (en) 2002-08-14
    US6092389A (en) 2000-07-25
    FR2769695B1 (en) 1999-12-31
    DE916741T1 (en) 1999-11-04
    KR19990037035A (en) 1999-05-25

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