EP2171105A1 - Method, device and system for the heat treatment of a running metal strip - Google Patents

Method, device and system for the heat treatment of a running metal strip

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Publication number
EP2171105A1
EP2171105A1 EP08774880A EP08774880A EP2171105A1 EP 2171105 A1 EP2171105 A1 EP 2171105A1 EP 08774880 A EP08774880 A EP 08774880A EP 08774880 A EP08774880 A EP 08774880A EP 2171105 A1 EP2171105 A1 EP 2171105A1
Authority
EP
European Patent Office
Prior art keywords
strip
heat
segment
metal strip
heated
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
EP08774880A
Other languages
German (de)
French (fr)
Other versions
EP2171105B1 (en
Inventor
Jean Marc Raick
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.)
Drever International SA
Original Assignee
Drever International SA
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Filing date
Publication date
Application filed by Drever International SA filed Critical Drever International SA
Priority to PL08774880T priority Critical patent/PL2171105T3/en
Publication of EP2171105A1 publication Critical patent/EP2171105A1/en
Application granted granted Critical
Publication of EP2171105B1 publication Critical patent/EP2171105B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C21D9/56—Continuous furnaces for strip or wire
    • 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

Definitions

  • the present invention relates to a method, a device and a system for heat treatment of a moving metal strip.
  • annealing One type of heat treatment process is called annealing.
  • the metal is heated to reach temperatures ranging, for example, from 500 0 C to 1100 0 C and then cooled in order to modify the crystal structure of the metal.
  • a disadvantage of such a process, as well as other heat treatment processes, is its high energy consumption.
  • the heating of the sheet is obtained by running it in front of radiant tubes in which flue gases from the combustion of a fuel and air circulate. In these installations, it has already been planned to recover heat from the flue gases leaving the radiant tubes to preheat the combustion air.
  • the heat consumed is worth, in spite of this recovery, of the order of 1, 7 times the heat found in the sheet, which corresponds to a yield of 60%.
  • Such a regenerative process comprises a heating of the strip, a cooling of the heated strip, and a heat transfer of at least one a segment of the web being cooled to at least one segment of the web being heated so as to perform at least a portion of each of said web cooling and heating.
  • the problem to be solved is the reduction of energy consumption in a heat treatment process of a moving metal strip.
  • this problem is solved by performing said heat transfer mainly by conduction. In this way, the heat is transmitted very efficiently without the need for an important additional energy supply in the form of work.
  • Conduction heat transfer is the most efficient form of heat transfer.
  • said heat transfer is performed from a plurality of segments of the band being heated to a plurality of segments of the band being cooled in reverse order in the tape running direction.
  • said heat transfer is performed from a plurality of segments of the band being heated to a plurality of segments of the band being cooled in reverse order in the tape running direction.
  • the strip is further heated by a heat source external to the strip.
  • a thermal differential for driving said heat transfer is created between the band being cooled and the band being heated.
  • said heat transfer is effected via at least one heat conducting solid element in contact with a segment of the strip being heated and a segment of the strip being cooled.
  • said at least one heat-conducting solid element is in the form of a roll, preferably a metal one. Such a roller can ensure continuous contact, and therefore good heat conduction, with the two segments of the moving strip.
  • the segment of the web being cooled is in contact with said roll at a contact angle of at least 20 °, preferably at least 30 °.
  • a contact angle of at least 20 °, preferably at least 30 °.
  • the segment of the web being heated is in contact with said roll at a contact angle of at least 20 °, preferably at least 30 °.
  • the temperature difference between a metal strip segment during cooling and a strip segment during heating between which at least a part of said conduction heat transfer takes place is at least 200 ° C. and / or or below 500 0 C.
  • Such a difference in temperature would allow a efficient heat transfer, without causing excessive heat shock in the metal strip.
  • the present invention also relates to a heat transmission device for simultaneously heating a metal strip moving upstream of an additional heating zone and cooling downstream of said additional heating zone.
  • the device comprises at least one heat-conducting solid element intended to be in contact with the said metal strip both upstream and downstream of the main heating zone, so as to transfer heat by conduction between at least one segment of the downstream metal strip and at least one segment of the upstream metal strip.
  • the device comprises a series of several heat-conducting solid elements, for example five, for successively contacting said metal strip both upstream and in reverse order in the running direction of the strip, downstream of the heating zone. principal, so as to transfer heat by conduction between segments of the metal strip downstream and segments of the metal strip upstream. In this way it is possible to ensure a progressive heating of the band during heating and equally progressive cooling of the band during cooling, in order to avoid thermal shocks while ensuring a significant heat transfer.
  • the device further comprises at least one baffle roll for defining a contact angle, preferably at least 20 °, between said metal strip upstream and / or downstream of the furnace and said heat-conducting solid element. in the form of a roll.
  • the present invention also relates to a heat treatment system, in particular annealing, continuously a strip scroll metal having a main heating zone and a heat transmission device according to the invention.
  • FIG. 1 shows a diagram of an earlier method
  • FIG. 2 shows a diagram of a method according to an embodiment of the invention
  • FIG. 3 shows a heat treatment system according to an embodiment of the invention.
  • FIG. 4 shows a heat treatment system according to an alternative embodiment of the invention
  • FIG. 5 shows a heat transmission device according to one embodiment of the invention
  • FIG. 6 shows heating curves. and cooling the metal strip which can be obtained with the heat transmission device of Figure 5.
  • FIG. 1 a conventional method of continuously annealing a moving steel strip is schematically illustrated. After cleaning 1 of the strip, it is heated from 30 0 C to 800 0 C in a heating step 2 in a radiant tube furnace. This specifies an energy input of 210 kW per tonne of steel in the form of natural gas, producing 50 kg of CO 2 and 80 mg of NO x per tonne of steel.
  • FIG. 2 an embodiment of the method of the present invention is shown schematically.
  • the heating is divided into a preheating step 2a wherein the steel strip is preheated to 30 0 C at 450 ° C., and a main heating step 2b in a radiant tube furnace, in which the strip is heated from 450 ° C. to 800 ° C.
  • the heat Q 'transferred to the strip in the preheating stage 2a comes from the cooling 3 of the same 800 ° C band at 450 ° C and is transmitted by conduction.
  • FIG. 3 represents a system 4 for continuously annealing a moving steel strip 5, according to one embodiment of the invention.
  • This system 4 comprises a device 6 for conductive heat transmission for preheating 2a and cooling 3 of the strip 5, and a furnace 7 for radiant tubes 8 for the additional heating 2b of the strip 5.
  • the furnace 7 with radiant tubes 8 is of the vertical type.
  • the device 6 for heat transmission is illustrated in greater detail in FIG. 5.
  • the strip 5 enters the device 6 through the inlet opening 9 and passes through said device 6 in the direction 10 to the oven 7 preheating. After the main heater 2b, the strip 5 spring oven and through the device 6 in the opposite direction 1 1 to the outlet opening 12 while cooling.
  • the device 6 comprises an alignment of seven heat conducting rolls 13 and two alignments of six deflector rollers 14, one on each side of the conductive roller alignment 13.
  • both the conductive rollers 13 and the rollers deflectors 14 have a diameter of 800 mm.
  • alternative diameters for each roll, as well as arrangements with different roll layouts and numbers could be contemplated by those skilled in the art depending on the circumstances.
  • the conductive rollers 13 must have a diameter capable of ensuring a good contact surface with the band 5 with a comparatively reduced speed of rotation, while avoiding plastic deformation of the band 5.
  • the deflector rollers 14 must also have a diameter that avoids A plastic deformation of the strip 5.
  • the conductive rollers 13 and baffles 14 may therefore have diameters lying, for example, in a range between 400 and 1600 mm. Due to the thermal expansion of the band 5, the speed of the band 5 during cooling is normally higher than its speed during heating.
  • the conductive roller 13 could have an angularly variable radius for adjusting the effective radius of the conductive roller 13 to the speed of the strip 5 on each side of the conductive roller 13.
  • Another possible solution is that the conductive roller 13 is divided into radial segments, having a certain freedom of angular movement relative to each other.
  • the baffle rollers 14 hold segments 5a of the strip 5 during preheating and segments 5b of the strip 5 being cooled at the same time. contact with the conductive rollers 13 at contact angles ⁇ . Different contact angles ⁇ can be envisaged by those skilled in the art depending on the circumstances. Each conductive roll 13 thus transfers heat by conduction of a segment 5b of the band 5 during cooling to a segment 5a of the band being heated. As the strip 5 passes through the device 6 in opposite directions 10,11 during preheating and during cooling, the strip 5 contacts the conductive rollers 13 in reverse order in its course during heating and during cooling.
  • This heat conduction will therefore be performed between the last segment 5b of the strip 5 during cooling and the first segment 5a of the strip 5 being preheated, between the penultimate segment 5b of the strip 5 during cooling and the second segment 5a of the strip 5 during preheating, and so on.
  • the temperatures of the strip 5 during cooling and during preheating follow, respectively, the curves 15 and 16 along the device 6, as illustrated in FIG. 6.
  • the bearings 17 correspond to the temperatures of the conductive rollers 13, each of them being intermediate to those of the segments 5a and 5b with which the respective conductive roller 13 is in contact .
  • Table 1 presents the parameters of an embodiment of the thermal treatment method of the invention in the device 6 described above with a strip 5 with a thickness of 1 mm, 1500 mm wide and a speed of 150 m / min for a production of 106 tons per hour.

Landscapes

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

Abstract

The invention relates to a method for the heat treatment of a running metal strip, which comprises: a heating step for heating the strip; a step for cooling the heated strip; and conductive heat transfer from at least one segment of the strip which is being cooled to at least one segment of the strip which is being heated, so that at least part of each of said cooling and heating steps is carried out on the strip. The invention also relates to a heat transmission device for implementing said method and having at least one thermally conductive solid element, such as for example a roll, and to a system for the heat treatment of a running metal strip that incorporates such a device.

Description

"Procédé, dispositif et système de traitement thermique d'une bande métallique en défilement" "Method, device and system for heat treatment of a moving metal strip"
La présente invention se rapporte à un procédé, un dispositif et un système de traitement thermique d'une bande métallique en défilement.The present invention relates to a method, a device and a system for heat treatment of a moving metal strip.
Dans le domaine métallurgique, il est généralement connu de l'homme du métier de traiter thermiquement des bandes métalliques afin, par exemple, de modifier la structure cristalline du métal pour améliorer ses caractéristiques mécaniques ou autres. D'une manière particulièrement avantageuse, un tel procédé peut être effectué de manière continue, en faisant circuler la bande métallique à travers une pluralité de zones à différentes températures. Ceci permet, par exemple, d'intégrer le traitement thermique de la bande métallique dans une ligne de production continue, avec des avantages certains d'efficacité économique.In the metallurgical field, it is generally known to those skilled in the art to heat-treat metal strips in order, for example, to modify the crystal structure of the metal to improve its mechanical or other characteristics. In a particularly advantageous manner, such a method can be carried out continuously, by circulating the metal strip through a plurality of zones at different temperatures. This allows, for example, to integrate the heat treatment of the metal strip into a continuous production line, with certain advantages of economic efficiency.
Un type de procédé de traitement thermique est celui dit de recuit. Dans un procédé de recuit le métal est chauffé pour atteindre des températures allant, par exemple, de 5000C à 11000C et ensuite refroidi afin de modifier la structure cristalline du métal. Un inconvénient d'un tel procédé, ainsi que d'autres procédés de traitement thermique, est sa grande consommation énergétique. Dans la production d'acier, il est fréquent de devoir recuire des tôles après un refroidissement préalable, par exemple dans le cas d'un laminage à froid. Dans des installations de recuit continu classiques, le chauffage de la tôle est obtenu par défilement de celle-ci devant des tubes radiants dans lesquels circulent des gaz de fumée provenant de la combustion d'un combustible et d'air. Dans ces installations, on a déjà prévu une récupération de la chaleur des fumées sortant des tubes radiants pour préchauffer l'air de combustion. Toutefois, étant donné les pertes de chaleur par les fumées et les fuites dans l'enceinte de l'installation de recuit, la chaleur consommée vaut, malgré cette récupération, de l'ordre de 1 ,7 fois la chaleur retrouvée dans la tôle, ce qui correspond à un rendement de 60 %.One type of heat treatment process is called annealing. In an annealing process, the metal is heated to reach temperatures ranging, for example, from 500 0 C to 1100 0 C and then cooled in order to modify the crystal structure of the metal. A disadvantage of such a process, as well as other heat treatment processes, is its high energy consumption. In the production of steel, it is common to have to anneal the sheets after prior cooling, for example in the case of cold rolling. In conventional continuous annealing installations, the heating of the sheet is obtained by running it in front of radiant tubes in which flue gases from the combustion of a fuel and air circulate. In these installations, it has already been planned to recover heat from the flue gases leaving the radiant tubes to preheat the combustion air. However, given the heat losses by the fumes and leaks in the enclosure of the annealing plant, the heat consumed is worth, in spite of this recovery, of the order of 1, 7 times the heat found in the sheet, which corresponds to a yield of 60%.
Typiquement, pour un recuit à 800° C, il est produit 50 kg de CO2/t d'acier, si le gaz combustible est du méthane. Etant donné que, après le cycle thermique, la température de l'acier revient à sa température initiale, c'est-à-dire celle d'avant recuit, la chaleur consommée se retrouve en totalité dans l'atmosphère, et/ou dans l'agent de refroidissement.Typically, for annealing at 800 ° C., 50 kg of CO 2 / t of steel are produced if the combustible gas is methane. Since, after the thermal cycle, the temperature of the steel returns to its initial temperature, that is to say before annealing, the heat consumed is found entirely in the atmosphere, and / or the coolant.
Si l'isolation des parties chaudes de l'installation et l'amélioration de l'efficacité des récupérateurs sur les fumées permettent d'améliorer le rendement global, il est extrêmement difficile de réduire radicalement la consommation énergétique, sans toucher au fondement même du système de chauffage et de refroidissement.If the insulation of the hot parts of the installation and the improvement of the efficiency of the recuperators on the fumes make it possible to improve the overall efficiency, it is extremely difficult to drastically reduce the energy consumption, without touching the very foundation of the system. heating and cooling.
On a également prévu d'améliorer le rendement du refroidissement d'objets en acier, tels que des tubes, soumis à un recuit continu puis à un refroidissement en plusieurs étapes. Pour ce faire, le gaz de refroidissement est soufflé en cascade sur les tubes, d'une étape de refroidissement à la précédente, tel que décrit dans la demande internationale de brevet WO 00/25076. Ce procédé, bien que performant en théorie, ne permet pas une mise en pratique industrielle sur des lignes de recuit de tôles à forte capacité de chauffe, de l'ordre de plus de 40 t/h. Il est en effet impossible de collecter de manière efficace les flux de gaz réchauffés et refroidis successivement dans les différentes sections de la cascade. Pour cette raison, il a été aussi proposé d'utiliser des procédés régénératifs, où au moins une partie de la chaleur retirée de la bande métallique pendant son refroidissement est utilisée pour la préchauffer. Un tel procédé régénératif, décrit dans la demande internationale WO 2004/063402 et formant l'état de la technique le plus proche, comporte un chauffage de la bande, un refroidissement de la bande chauffée, et un transfert de chaleur d'au moins un segment de la bande en cours de refroidissement vers au moins un segment de la bande en cours de chauffage, de manière à effectuer au moins une partie de chacun desdits refroidissement et chauffage de la bande.It has also been planned to improve the cooling efficiency of steel objects, such as tubes, subjected to continuous annealing and then to multi-stage cooling. To do this, the cooling gas is cascaded over the tubes, from a cooling step to the previous one, as described in the international patent application WO 00/25076. This method, although theoretically efficient, does not allow an industrial practice on annealing lines of sheets with high heating capacity, of the order of more than 40 t / h. It is indeed impossible to effectively collect the gas streams heated and cooled successively in different sections of the cascade. For this reason, it has also been proposed to use regenerative processes, where at least some of the heat removed from the metal band during its cooling is used to preheat it. Such a regenerative process, described in the international application WO 2004/063402 and forming the closest state of the art, comprises a heating of the strip, a cooling of the heated strip, and a heat transfer of at least one a segment of the web being cooled to at least one segment of the web being heated so as to perform at least a portion of each of said web cooling and heating.
Toutefois, dans cet état de la technique, ledit transfert de chaleur s'effectue par circulation d'un gaz caloporteur. Ceci présente les inconvénients de n'offrir qu'un taux réduit de transfert de chaleur et d'exiger un apport énergétique supplémentaire pour actionner la circulation du gaz caloporteur. En augmentant le taux de circulation du gaz au delà d'un certain point, tout gain en transfert de chaleur est plus que compensé par le travail additionnel nécessaire pour faire circuler le gaz plus vite.However, in this state of the art, said heat transfer is effected by circulating a heat-transfer gas. This has the drawbacks of offering only a reduced rate of heat transfer and of requiring an additional energy supply to actuate the circulation of the heat transfer gas. By increasing the rate of gas flow beyond a certain point, any gain in heat transfer is more than offset by the additional work required to circulate the gas faster.
Le problème à résoudre est donc la réduction de la consommation énergétique dans un procédé de traitement thermique d'une bande métallique en défilement. Dans la présente invention, ce problème est résolu en effectuant ledit transfert de chaleur principalement par conduction. De cette manière, la chaleur est transmise de manière très efficace sans nécessité d'un apport énergétique supplémentaire important en forme de travail. Le transfert de chaleur par conduction est la forme de transfert de chaleur la plus efficace.The problem to be solved is the reduction of energy consumption in a heat treatment process of a moving metal strip. In the present invention, this problem is solved by performing said heat transfer mainly by conduction. In this way, the heat is transmitted very efficiently without the need for an important additional energy supply in the form of work. Conduction heat transfer is the most efficient form of heat transfer.
De préférence, ledit transfert de chaleur est effectué d'une pluralité de segments de la bande en cours de chauffage vers une pluralité de segments de la bande en cours de refroidissement en ordre inversé dans le sens de défilement de la bande. De cette manière il est possible d'effectuer un transfert de chaleur important tout en maintenant - A - des gradients de température modérés, et donc en évitant des tensions internes et des déformations de la bande métallique.Preferably, said heat transfer is performed from a plurality of segments of the band being heated to a plurality of segments of the band being cooled in reverse order in the tape running direction. In this way it is possible to carry out a significant heat transfer while maintaining - A - moderate temperature gradients, and thus avoiding internal stresses and deformations of the metal strip.
De préférence, dans ladite étape de chauffage de la bande, la bande est chauffée en outre par une source de chaleur externe à la bande. De cette manière un différentiel thermique servant à impulser ledit transfert de chaleur est crée entre la bande en cours de refroidissement et la bande en cours de chauffage.Preferably, in said strip heating step, the strip is further heated by a heat source external to the strip. In this way a thermal differential for driving said heat transfer is created between the band being cooled and the band being heated.
De préférence, ledit transfert de chaleur est opéré par l'intermédiaire d'au moins un élément solide conducteur de chaleur en contact avec un segment de la bande en cours de chauffage et un segment de la bande en cours de refroidissement. De cette manière, la conduction de chaleur entre le segment de la bande en cours de chauffage et le segment de la bande en cours de refroidissement est assurée par ledit élément solide. De préférence, ledit au moins un élément solide conducteur de chaleur est en forme de rouleau, de préférence métallique. Un tel rouleau peut assurer un contact continu, et donc une bonne conduction de chaleur, avec les deux segments de la bande en défilement.Preferably, said heat transfer is effected via at least one heat conducting solid element in contact with a segment of the strip being heated and a segment of the strip being cooled. In this way, the heat conduction between the segment of the strip being heated and the segment of the strip being cooled is provided by said solid element. Preferably, said at least one heat-conducting solid element is in the form of a roll, preferably a metal one. Such a roller can ensure continuous contact, and therefore good heat conduction, with the two segments of the moving strip.
De préférence, le segment de la bande en cours de refroidissement est en contact avec ledit rouleau sous un angle de contact d'au moins 20°, de préférence d'au moins 30°. Avec un tel angle de contact, il est possible d'offrir une bonne surface de contact entre rouleau et bande, et donc un bon transfert thermique.Preferably, the segment of the web being cooled is in contact with said roll at a contact angle of at least 20 °, preferably at least 30 °. With such a contact angle, it is possible to offer a good contact surface between roll and strip, and therefore a good heat transfer.
De préférence, le segment de la bande en cours de chauffage est en contact avec ledit rouleau sous un angle de contact d'au moins 20°, de préférence d'au moins 30°.Preferably, the segment of the web being heated is in contact with said roll at a contact angle of at least 20 °, preferably at least 30 °.
De préférence, la différence de température entre un segment de bande métallique en cours de refroidissement et un segment de bande en cours de chauffage entre lesquels a lieu au moins une partie dudit transfert de chaleur par conduction est d'au moins 2000C et/ou au dessous de 5000C. Une telle différence de température permettrait un transfert de chaleur efficace, sans provoquer un choc thermique excessif dans la bande métallique.Preferably, the temperature difference between a metal strip segment during cooling and a strip segment during heating between which at least a part of said conduction heat transfer takes place is at least 200 ° C. and / or or below 500 0 C. Such a difference in temperature would allow a efficient heat transfer, without causing excessive heat shock in the metal strip.
La présente invention se rapporte aussi à un dispositif de transmission de chaleur pour simultanément chauffer une bande métallique en défilement en amont d'une zone de chauffage additionnel et la refroidir en aval de ladite zone de chauffage additionnel. Afin d'effectuer un transfert de chaleur efficient sans nécessité d'apport énergétique significatif en forme de travail, le dispositif comporte au moins un élément solide conducteur de chaleur destiné à être en contact avec ladite bande métallique tant en amont qu'en aval de la zone de chauffage principal, de manière à transférer de la chaleur par conduction entre au moins un segment de la bande métallique en aval et au moins un segment de la bande métallique en amont.The present invention also relates to a heat transmission device for simultaneously heating a metal strip moving upstream of an additional heating zone and cooling downstream of said additional heating zone. In order to effect an efficient heat transfer without the need for a significant energy supply in the form of a work, the device comprises at least one heat-conducting solid element intended to be in contact with the said metal strip both upstream and downstream of the main heating zone, so as to transfer heat by conduction between at least one segment of the downstream metal strip and at least one segment of the upstream metal strip.
De préférence, le dispositif comporte une série de plusieurs éléments solides conducteurs de chaleur, par exemple cinq, pour successivement contacter ladite bande métallique tant en amont que, en ordre inversé dans le sens de défilement de la bande, en aval de la zone de chauffage principal, de manière à transférer de la chaleur par conduction entre des segments de la bande métallique en aval et des segments de la bande métallique en amont. De cette manière il est possible d'assurer un chauffage progressif de la bande en cours de chauffage et un refroidissement tout aussi progressif de la bande en cours de refroidissement, afin d'éviter les chocs thermiques tout en assurant un transfert significatif de chaleur. De préférence, le dispositif comporte en outre au moins un rouleau déflecteur afin de définir un angle de contact, de préférence d'au moins 20°, entre ladite bande métallique en amont et/ou en aval du four et ledit élément solide conducteur de chaleur en forme de rouleau.Preferably, the device comprises a series of several heat-conducting solid elements, for example five, for successively contacting said metal strip both upstream and in reverse order in the running direction of the strip, downstream of the heating zone. principal, so as to transfer heat by conduction between segments of the metal strip downstream and segments of the metal strip upstream. In this way it is possible to ensure a progressive heating of the band during heating and equally progressive cooling of the band during cooling, in order to avoid thermal shocks while ensuring a significant heat transfer. Preferably, the device further comprises at least one baffle roll for defining a contact angle, preferably at least 20 °, between said metal strip upstream and / or downstream of the furnace and said heat-conducting solid element. in the form of a roll.
La présente invention se rapporte aussi à un système de traitement thermique, en particulier de recuit, en continu d'une bande métallique en défilement comportant une zone de chauffage principal et un dispositif de transmission de chaleur suivant l'invention.The present invention also relates to a heat treatment system, in particular annealing, continuously a strip scroll metal having a main heating zone and a heat transmission device according to the invention.
Des détails concernant l'invention sont décrits ci-après, de manière illustrative, mais non restrictive, faisant référence aux dessins. La figure 1 montre un schéma d'un procédé antérieur, la figure 2 montre un schéma d'un procédé suivant un mode de réalisation de l'invention, la figure 3 montre un système de traitement thermique suivant un mode de réalisation de l'invention, la figure 4 montre un système de traitement thermique suivant un mode de réalisation alternatif de l'invention, la figure 5 montre un dispositif de transmission de chaleur suivant un mode de réalisation de l'invention, et la figure 6 montre des courbes de chauffage et de refroidissement de la bande métallique qui peuvent être obtenues avec le dispositif de transmission de chaleur de la figure 5.Details of the invention are described below, illustratively but not restrictively, with reference to the drawings. FIG. 1 shows a diagram of an earlier method, FIG. 2 shows a diagram of a method according to an embodiment of the invention, FIG. 3 shows a heat treatment system according to an embodiment of the invention. FIG. 4 shows a heat treatment system according to an alternative embodiment of the invention, FIG. 5 shows a heat transmission device according to one embodiment of the invention, and FIG. 6 shows heating curves. and cooling the metal strip which can be obtained with the heat transmission device of Figure 5.
Dans la figure 1 , un procédé conventionnel de recuit en continu d'une bande d'acier en défilement est schématiquement illustré. Après un nettoyage 1 de la bande, celle-ci est chauffée de 300C à 8000C dans une étape de chauffage 2 dans un four à tubes radiants. Ceci précise un apport énergétique Q de 210 kW par tonne d'acier, sous forme de gaz naturel, produisant par sa combustion 50 kg de CO2 et 80 mg de NOx par tonne d'acier.In Figure 1, a conventional method of continuously annealing a moving steel strip is schematically illustrated. After cleaning 1 of the strip, it is heated from 30 0 C to 800 0 C in a heating step 2 in a radiant tube furnace. This specifies an energy input of 210 kW per tonne of steel in the form of natural gas, producing 50 kg of CO 2 and 80 mg of NO x per tonne of steel.
Ensuite, pour évacuer une chaleur Q' dans le refroidissement 3 de la bande jusqu'à 450°C, on précise de 2 m3 d'eau par tonne d'acier, ainsi que d'un apport énergétique supplémentaire W sous forme d'électricité de 20 kW par tonne d'acier afin de faire circuler le ou les fluides de refroidissement.Then, to evacuate a heat Q 'in the cooling 3 of the band up to 450 ° C, one specifies 2 m 3 of water per ton of steel, as well as an additional energy supply W in the form of electricity of 20 kW per ton of steel to circulate the cooling fluid (s).
Le coût ainsi que l'impact environnemental de ce procédé conventionnel ne sont donc pas négligeables. Dans la figure 2, un mode de réalisation du procédé de la présente invention est représenté schématiquement. Comme dans le procédé conventionnel de la figure 1 , la bande d'acier est chauffée après un nettoyage 1. Toutefois, dans ce procédé, le chauffage est divisé dans une étape de préchauffage 2a dans laquelle la bande d'acier est préchauffée de 300C à 4500C, et une étape de chauffage principal 2b dans un four à tubes radiants, dans laquelle la bande est chauffée de 450°C à 8000C. La chaleur Q' transférée à la bande dans l'étape de préchauffage 2a provient du refroidissement 3 de la même bande de 800°C à 450°C et est transmise par conduction. Avec ce procédé, il suffit d'un apport énergétique Q-Q' dans le four à tubes radiants, réduisant la consommation de gaz naturel à un équivalent de 120 kW par tonne d'acier, ne produisant de cette manière que 30 kg de CO2 et 45 mg de NOx par tonne d'acier. Par ailleurs, le refroidissement peut s'effectuer sans consommation d'eau et sans nécessité d'effectuer un travail pour faire circuler un fluide de refroidissement. Le coût et l'impact environnemental de ce procédé suivant l'invention sont donc sensiblement moindres.The cost as well as the environmental impact of this conventional process are not negligible. In Fig. 2, an embodiment of the method of the present invention is shown schematically. As in the conventional process of Figure 1, the steel strip is heated after cleaning 1. However, in this method, the heating is divided into a preheating step 2a wherein the steel strip is preheated to 30 0 C at 450 ° C., and a main heating step 2b in a radiant tube furnace, in which the strip is heated from 450 ° C. to 800 ° C. The heat Q 'transferred to the strip in the preheating stage 2a comes from the cooling 3 of the same 800 ° C band at 450 ° C and is transmitted by conduction. With this process, all that is required is an energy input QQ 'in the radiant tube furnace, reducing the consumption of natural gas to an equivalent of 120 kW per tonne of steel, thus producing only 30 kg of CO 2 and 45 mg NO x per tonne of steel. Moreover, the cooling can be carried out without consuming water and without the need to perform work to circulate a cooling fluid. The cost and the environmental impact of this process according to the invention are therefore substantially less.
La figure 3 représente un système 4 de recuit en continu d'une bande d'acier 5 en défilement, suivant un mode de réalisation de l'invention. Ce système 4 comporte un dispositif 6 de transmission de chaleur par conduction pour le préchauffage 2a et le refroidissement 3 de la bande 5, et un four 7 à tubes radiants 8 pour le chauffage additionnel 2b de la bande 5. Dans le mode de réalisation représenté dans cette figure 3, le four 7 à tubes radiants 8 est du type vertical. Toutefois, on peut aussi considérer, comme illustré dans la figure 4, l'alternative d'un arrangement horizontal du four 7 à tubes radiants 8.FIG. 3 represents a system 4 for continuously annealing a moving steel strip 5, according to one embodiment of the invention. This system 4 comprises a device 6 for conductive heat transmission for preheating 2a and cooling 3 of the strip 5, and a furnace 7 for radiant tubes 8 for the additional heating 2b of the strip 5. In the illustrated embodiment in this figure 3, the furnace 7 with radiant tubes 8 is of the vertical type. However, it is also possible to consider, as illustrated in FIG. 4, the alternative of a horizontal arrangement of the furnace 7 with radiant tubes 8.
Le dispositif 6 de transmission de chaleur est illustré en plus grand détail dans la figure 5. La bande 5 entre dans le dispositif 6 par l'ouverture d'entrée 9 et traverse ledit dispositif 6 dans le sens 10 jusqu'au four 7 en se préchauffant. Après le chauffage principal 2b, la bande 5 ressort du four et traverse le dispositif 6 dans le sens opposé 1 1 jusqu'à l'ouverture de sortie 12 en se refroidissant.The device 6 for heat transmission is illustrated in greater detail in FIG. 5. The strip 5 enters the device 6 through the inlet opening 9 and passes through said device 6 in the direction 10 to the oven 7 preheating. After the main heater 2b, the strip 5 spring oven and through the device 6 in the opposite direction 1 1 to the outlet opening 12 while cooling.
Le dispositif 6 comporte un alignement de sept rouleaux conducteurs de chaleur 13 et deux alignements de six rouleaux déflecteurs 14, un de chaque côté de l'alignement de rouleaux conducteurs 13. Dans le mode de réalisation illustré, tant les rouleaux conducteurs 13 que les rouleaux déflecteurs 14 ont un diamètre de 800 mm. Toutefois, des diamètres alternatifs pour chaque rouleau, ainsi que des arrangements avec des dispositions et nombres différents de rouleaux pourraient être envisagés par l'homme du métier selon les circonstances. Les rouleaux conducteurs 13 doivent avoir un diamètre capable d'assurer une bonne surface de contact avec la bande 5 avec une vitesse de rotation comparativement réduite, tout en évitant une déformation plastique de la bande 5. Les rouleaux déflecteurs 14 doivent aussi avoir un diamètre évitant une déformation plastique de la bande 5. Selon les paramètres géométriques et mécaniques de la bande 5, les rouleaux conducteurs 13 et déflecteurs 14 peuvent donc avoir des diamètres se trouvant, par exemple, dans une plage entre les 400 et les 1600 mm. À cause de la dilatation thermique de la bande 5, la vitesse de la bande 5 en cours de refroidissement est normalement supérieure à sa vitesse en cours de chauffage. Plusieurs solutions sont envisageables par l'homme du métier pour éviter un glissement partiel de la bande 5 sur un rouleau conducteur 13. Par exemple, le rouleau conducteur 13 pourrait avoir un rayon angulairement variable permettant d'ajuster le rayon effectif du rouleau conducteur 13 à la vitesse de la bande 5 de chaque côté du rouleau conducteur 13. Une autre solution envisageable est que le rouleau conducteur 13 soit divisé en segments radiaux, présentant une certaine liberté de mouvement angulaire relativement les uns aux autres. Quand une bande 5 traverse le dispositif 6 tant en cours de préchauffage qu'en cours de refroidissement, les rouleaux déflecteurs 14 maintiennent des segments 5a de la bande 5 en cours de préchauffage et des segments 5b de la bande 5 en cours de refroidissement simultanément en contact avec les rouleaux conducteurs 13 sous des angles de contact α. Des différents angles de contact α sont envisageables par l'homme du métier selon les circonstances. Chaque rouleau conducteur 13 transfère ainsi de la chaleur par conduction d'un segment 5b de la bande 5 en cours de refroidissement à un segment 5a de la bande en cours de chauffage. Comme la bande 5 traverse le dispositif 6 dans des sens opposés 10,11 en cours de préchauffage et en cours de refroidissement, la bande 5 contacte les rouleaux conducteurs 13 en ordre inversé dans son défilement en cours de chauffage et en cours de refroidissement. Cette conduction de chaleur sera donc effectuée entre le dernier segment 5b de la bande 5 en cours de refroidissement et le premier segment 5a de la bande 5 en cours de préchauffage, entre l'avant-dernier segment 5b de la bande 5 en cours de refroidissement et le deuxième segment 5a de la bande 5 en cours de préchauffage, et ainsi de suite. De cette manière, les températures de la bande 5 en cours de refroidissement et en cours de préchauffage suivent, respectivement, les courbes 15 et 16 le long du dispositif 6, telles qu'illustrées sur la figure 6. Comme on peut apprécier dans cette figure, cette configuration permet un préchauffage et un refroidissement progressifs de la bande 5. Les paliers 17 correspondent aux températures des rouleaux conducteurs 13, chacune d'entre elles étant intermédiaire de celles des segments 5a et 5b avec lesquels le rouleau conducteur 13 respectif est en contact.The device 6 comprises an alignment of seven heat conducting rolls 13 and two alignments of six deflector rollers 14, one on each side of the conductive roller alignment 13. In the illustrated embodiment, both the conductive rollers 13 and the rollers deflectors 14 have a diameter of 800 mm. However, alternative diameters for each roll, as well as arrangements with different roll layouts and numbers could be contemplated by those skilled in the art depending on the circumstances. The conductive rollers 13 must have a diameter capable of ensuring a good contact surface with the band 5 with a comparatively reduced speed of rotation, while avoiding plastic deformation of the band 5. The deflector rollers 14 must also have a diameter that avoids A plastic deformation of the strip 5. Depending on the geometrical and mechanical parameters of the strip 5, the conductive rollers 13 and baffles 14 may therefore have diameters lying, for example, in a range between 400 and 1600 mm. Due to the thermal expansion of the band 5, the speed of the band 5 during cooling is normally higher than its speed during heating. Several solutions are conceivable by those skilled in the art to prevent partial slippage of the strip 5 on a conductive roller 13. For example, the conductive roller 13 could have an angularly variable radius for adjusting the effective radius of the conductive roller 13 to the speed of the strip 5 on each side of the conductive roller 13. Another possible solution is that the conductive roller 13 is divided into radial segments, having a certain freedom of angular movement relative to each other. When a strip 5 passes through the device 6 both during preheating and during cooling, the baffle rollers 14 hold segments 5a of the strip 5 during preheating and segments 5b of the strip 5 being cooled at the same time. contact with the conductive rollers 13 at contact angles α. Different contact angles α can be envisaged by those skilled in the art depending on the circumstances. Each conductive roll 13 thus transfers heat by conduction of a segment 5b of the band 5 during cooling to a segment 5a of the band being heated. As the strip 5 passes through the device 6 in opposite directions 10,11 during preheating and during cooling, the strip 5 contacts the conductive rollers 13 in reverse order in its course during heating and during cooling. This heat conduction will therefore be performed between the last segment 5b of the strip 5 during cooling and the first segment 5a of the strip 5 being preheated, between the penultimate segment 5b of the strip 5 during cooling and the second segment 5a of the strip 5 during preheating, and so on. In this manner, the temperatures of the strip 5 during cooling and during preheating follow, respectively, the curves 15 and 16 along the device 6, as illustrated in FIG. 6. As can be appreciated in this figure this configuration allows progressive preheating and cooling of the strip 5. The bearings 17 correspond to the temperatures of the conductive rollers 13, each of them being intermediate to those of the segments 5a and 5b with which the respective conductive roller 13 is in contact .
Le tableau 1 présente les paramètres d'un mode de réalisation du procédé de traitement thermique de l'invention dans le dispositif 6 décrit ci-dessus avec une bande 5 avec 1 mm de grosseur, 1500 mm de largeur et un vitesse de défilement de 150 m/min pour une production de 106 tonnes par heure.Table 1 presents the parameters of an embodiment of the thermal treatment method of the invention in the device 6 described above with a strip 5 with a thickness of 1 mm, 1500 mm wide and a speed of 150 m / min for a production of 106 tons per hour.
Quoique la présente invention ait été décrite en se référant à des exemples de réalisation spécifiques, il est évident que des différentes modifications et changements peuvent être effectués sur ces exemples sans sortir de la portée générale de l'invention telle que définie par les revendications. Par conséquent, la description et les dessins doivent être considérés dans un sens illustratif plutôt que restrictif. Although the present invention has been described with reference to specific exemplary embodiments, it is obvious that various modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the claims. Therefore, the description and drawings should be considered in an illustrative rather than restrictive sense.
REFERENCES DES FIGURESREFERENCES OF THE FIGURES
1 Nettoyage1 Cleaning
2 Chauffage 2a Préchauffage2 Heating 2a Preheating
2b Chauffage principal2b Main heating
3 Refroidissement3 Cooling
4 Système de recuit en continu4 Continuous annealing system
5 Bande d'acier 5a Segment de la bande en cours de préchauffage5 Steel strip 5a Segment of the strip being preheated
5b Segment de la bande en cours de refroidissement5b Segment of the band being cooled
6 Dispositif de transmission de chaleur6 Heat transmission device
7 Four à tubes radiants7 Radiant tube furnace
8 Tubes radiants 9 Ouverture d'entrée8 Radiant tubes 9 Entrance opening
10 Sens de défilement de la bande en cours de préchauffage10 Running direction of the preheating band
11 Sens de défilement de la bande en cours de refroidissement11 Scroll direction of the band being cooled
12 Ouverture de sortie12 Opening of exit
13 Rouleau conducteur 14 Rouleau déflecteur13 Conductive Roller 14 Deflector Roller
15 Courbe de préchauffage15 Preheating Curve
16 Courbe de refroidissement16 Cooling curve
17 Températures des rouleaux conducteurs 17 Temperature of conductive rollers
Table 1 : Paramètres de fonctionnement du dispositif 6 Table 1: Device 6 Operating Parameters

Claims

REVENDICATIONS
1. Un procédé de traitement thermique d'une bande (5) métallique en défilement, comprenant :A method of heat treating a moving metal strip (5), comprising:
- un chauffage (2a, 2b) de la bande (5),a heating (2a, 2b) of the strip (5),
5 - un refroidissement (3) de la bande (5) chauffée, etA cooling (3) of the heated strip (5), and
- un transfert de chaleur d'au moins un segment (5b) de la bande (5) en cours de refroidissement vers au moins un segment (5a) de la bande (5) en cours de chauffage, de manière à effectuer au moins une partie de chacun desdits refroidissement et chauffage (3 ; 2a,2b) de la0 bande, et caractérisé en ce que ledit transfert de chaleur s'effectue principalement par conduction.a heat transfer of at least one segment (5b) of the strip (5) being cooled to at least one segment (5a) of the strip (5) being heated, so as to effect at least one part of each of said cooling and heating (3; 2a, 2b) of the band, and characterized in that said heat transfer is mainly by conduction.
2. Un procédé suivant la revendication précédente, dans lequel ledit transfert de chaleur est effectué d'une pluralité de segments5 (5a) de la bande (5) en cours de chauffage vers une pluralité de segments (5b) de la bande (5) en cours de refroidissement en ordre inversé dans le sens de défilement de la bande (5).2. A method according to the preceding claim, wherein said heat transfer is effected from a plurality of segments (5a) of the web (5) being heated to a plurality of segments (5b) of the web (5). during cooling in reverse order in the running direction of the strip (5).
3. Un procédé suivant la revendication 1 , dans lequel, dans ladite étape de chauffage (2a, 2b) de la bande, la bande est chauffée en o outre par une source de chaleur externe à la bande.3. A method according to claim 1, wherein in said strip heating step (2a, 2b) the strip is further heated by a heat source external to the strip.
4. Un procédé suivant l'une quelconque des revendications précédentes, dans lequel ledit transfert de chaleur est opéré par l'intermédiaire d'au moins un élément solide conducteur de chaleur en contact avec un segment (5a) de la bande (5) en cours de chauffage et 5 un segment (5b) de la bande (5) en cours de refroidissement.4. A process according to any one of the preceding claims, wherein said heat transfer is effected via at least one heat-conducting solid element in contact with a segment (5a) of the strip (5). heating course and a segment (5b) of the web (5) being cooled.
5. Un procédé suivant la revendication 4, dans lequel ledit au moins un élément solide conducteur de chaleur est en forme de rouleau (13), de préférence métallique.5. A process according to claim 4, wherein said at least one heat conducting solid element is in roll form (13), preferably metal.
6. Un procédé suivant la revendication 5, dans lequel le 0 segment (5b) de la bande (5) en cours de refroidissement est en contact avec ledit rouleau (13) sous un angle de contact d'au moins 20°, de préférence au moins 30°.6. A method according to claim 5, wherein the segment (5b) of the strip (5) being cooled is in contact with said roller (13) at a contact angle of at least 20 °, preferably at least 30 °.
7. Un procédé suivant l'une quelconque des revendications 5 ou 6, dans lequel le segment (5a) de la bande (5) en cours de chauffage est en contact avec ledit rouleau (13) sous un angle de contact d'au moins 20°, de préférence au moins 30°.A method according to any one of claims 5 or 6, wherein the segment (5a) of the web (5) being heated is in contact with said roll (13) at a contact angle of at least 20 °, preferably at least 30 °.
8. Un procédé suivant l'une quelconque des revendications précédentes, dans lequel la différence de température entre un segment (5b) de bande métallique (5) en cours de refroidissement et un segment (5a) de bande (5) en cours de chauffage entre lesquels a lieu au moins une partie dudit transfert de chaleur par conduction est d'au moins 2000C.A method as claimed in any one of the preceding claims, wherein the temperature difference between a segment (5b) of metal strip (5) being cooled and a segment (5a) of strip (5) being heated. between which at least a part of said heat transfer by conduction takes place is at least 200 ° C.
9. Un procédé suivant l'une quelconque des revendications précédentes, dans lequel la différence de température entre un segment (5b) de bande métallique (5) en cours de refroidissement et un segment (5a) de bande (5) en cours de chauffage entre lesquels a lieu au moins une partie dudit transfert de chaleur par conduction est au dessous de 5000CA method according to any preceding claim, wherein the temperature difference between a segment (5b) of metal strip (5) being cooled and a segment (5a) of strip (5) being heated between which at least a part of said heat transfer by conduction takes place is less than 500 ° C.
10. Un dispositif de transmission de chaleur (6) pour simultanément chauffer une bande métallique (5) en défilement en amont d'une zone de chauffage principal (7) et la refroidir en aval de ladite zone de chauffage principal (7), caractérisé en ce qu'il comporte au moins un élément solide conducteur de chaleur qui est en contact avec ladite bande métallique (5) tant en amont qu'en aval de la zone de chauffage principal (7), de manière à transférer de la chaleur par conduction entre au moins un segment (5b) de la bande métallique (5) en aval et au moins un segment (5a) de la bande métallique (5) en amont.10. A heat transmission device (6) for simultaneously heating a metal strip (5) running upstream of a main heating zone (7) and cooling it downstream of said main heating zone (7), characterized in that it comprises at least one solid heat-conducting element which is in contact with said metal strip (5) both upstream and downstream of the main heating zone (7), so as to transfer heat through conduction between at least one segment (5b) of the metal strip (5) downstream and at least one segment (5a) of the metal strip (5) upstream.
11.Un dispositif (6) suivant la revendication 10, comportant une série de plusieurs éléments solides conducteurs de chaleur, pour successivement contacter ladite bande métallique (5) tant en amont que, en ordre inversé dans le sens de défilement de la bande (5), en aval de Ia zone de chauffage principal (7), de manière à transférer de la chaleur par conduction entre des segments (5b) de la bande métallique (5) en aval et des segments (5a) de la bande métallique (5) en amont.11.A device (6) according to claim 10, comprising a series of several heat-conducting solid elements, for successively contacting said metal strip (5) both upstream and in reverse order in the running direction of the strip (5). ), downstream of The main heating zone (7) for transferring heat by conduction between segments (5b) of the downstream metal strip (5) and segments (5a) of the upstream metal strip (5).
12. Un dispositif (6) suivant l'une des revendications 10 ou 11 , dans lequel ledit au moins un élément solide conducteur de chaleur est en forme de rouleau (13), de préférence métallique.12. A device (6) according to one of claims 10 or 11, wherein said at least one heat conducting solid element is in the form of a roller (13), preferably metal.
13. Un dispositif (6) suivant l'une quelconque des revendications 10 à 12, comportant en outre au moins un rouleau déflecteur (14) afin de définir un angle de contact entre ladite bande métallique (5) en amont et/ou en aval de la zone de chauffage principalA device (6) according to any one of claims 10 to 12, further comprising at least one baffle roller (14) for defining a contact angle between said metal strip (5) upstream and / or downstream. of the main heating zone
(7) et ledit élément solide conducteur de chaleur en forme de rouleau(7) and said heat conducting solid element in the form of a roll
(13).(13).
14.Un système de traitement thermique, en particulier de recuit, en continu d'une bande métallique (5) en défilement comportant une zone de chauffage principal (7) et un dispositif de transmission de chaleur (6) suivant lune des revendications 10 à 13. 14. A heat treatment system, in particular continuously annealing a scrolling metal strip (5) comprising a main heating zone (7) and a heat transmission device (6) according to one of claims 10 to 13.
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BE1017683A3 (en) 2009-03-03
ES2355695T3 (en) 2011-03-30
PL2171105T3 (en) 2011-06-30
US20100186940A1 (en) 2010-07-29
CN101743331B (en) 2012-03-28

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