EP2171105B1 - 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 Download PDF

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Publication number
EP2171105B1
EP2171105B1 EP08774880A EP08774880A EP2171105B1 EP 2171105 B1 EP2171105 B1 EP 2171105B1 EP 08774880 A EP08774880 A EP 08774880A EP 08774880 A EP08774880 A EP 08774880A EP 2171105 B1 EP2171105 B1 EP 2171105B1
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Prior art keywords
strip
heat
segment
heated
metal strip
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EP08774880A
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German (de)
French (fr)
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EP2171105A1 (en
Inventor
Jean Marc Raick
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Drever International SA
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Drever International SA
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Priority to PL08774880T priority Critical patent/PL2171105T3/en
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    • 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 temperatures of, for example, 500 ° C to 1100 ° C and then cooled 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 heating the strip, cooling the heated strip, and transferring heat of at least one segment of the strip being cooled to at least one segment of the strip. the strip being heated, so as to effect at least a portion of each of said cooling and heating of the strip.
  • the problem to be solved is the reduction of energy consumption in a heat treatment process of a moving metal strip.
  • 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 heat conduction between the segment of the strip being heated and the segment of the strip being cooled is provided by said solid element.
  • said at least one heat-conducting solid element is in the form of a roll, preferably a metal one.
  • 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 being cooled and a strip segment being heated between which at least a portion of said conduction heat transfer takes place is at least 200 ° C and / or or below 500 ° 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 solid heat conducting element intended to be in contact with 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.
  • 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 a conventional method of continuously annealing a moving steel strip is schematically illustrated. After cleaning 1 of the strip, it is heated from 30 ° C to 800 ° 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 in which the steel strip is preheated from 30 ° C to 450 ° C, and a step heating unit 2b in a radiant tube furnace, wherein 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 strip from 800 ° C to 450 ° C and is transmitted by conduction.
  • the figure 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 the figure 5 .
  • the strip 5 enters the device 6 through the inlet opening 9 and through said device 6 in the direction 10 to the oven 7 by preheating. After the main heater 2b, the strip 5 spring oven and through the device 6 in the opposite direction 11 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.
  • 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.
  • 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 during cooling 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. figure 6 .
  • this configuration allows a gradual 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 driver 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.

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

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 500°C à 1100°C 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 temperatures of, for example, 500 ° C to 1100 ° C and then cooled 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 chamber 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.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.

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.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 heating the strip, cooling the heated strip, and transferring heat of at least one segment of the strip being cooled to at least one segment of the strip. the strip being heated, so as to effect at least a portion of each of said cooling and heating of the strip.

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.The problem to be solved is the reduction of energy consumption in a heat treatment process of a moving metal strip.

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.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 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 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.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.

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 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 200°C et/ou au dessous de 500°C. 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 being cooled and a strip segment being heated between which at least a portion of said conduction heat transfer takes place is at least 200 ° C and / or or below 500 ° 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 efficient heat transfer without the need for significant energy input in the form of work, the device comprises at least one solid heat conducting element intended to be in contact with 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.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.

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 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.
  • The figure 1 shows a diagram of an earlier process,
  • the figure 2 shows a diagram of a method according to an embodiment of the invention,
  • the figure 3 shows a heat treatment system according to one embodiment of the invention,
  • the figure 4 shows a heat treatment system according to an alternative embodiment of the invention,
  • the figure 5 shows a heat transmission device according to one embodiment of the invention, and
  • the figure 6 shows heating and cooling curves of the metal strip that can be obtained with the heat transfer device of the 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 30°C à 800°C 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 the 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 ° C to 800 ° 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.The cost as well as the environmental impact of this conventional process are not negligible.

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 30°C à 450°C, et une étape de chauffage principal 2b dans un four à tubes radiants, dans laquelle la bande est chauffée de 450°C à 800°C. 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.In the figure 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 process, the heating is divided into a preheating step 2a in which the steel strip is preheated from 30 ° C to 450 ° C, and a step heating unit 2b in a radiant tube furnace, wherein 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 strip from 800 ° C to 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.The figure 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, we can also consider, as illustrated in the figure 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 11 jusqu'à l'ouverture de sortie 12 en se refroidissant.The device 6 for heat transmission is illustrated in greater detail in the figure 5 . The strip 5 enters the device 6 through the inlet opening 9 and through said device 6 in the direction 10 to the oven 7 by preheating. After the main heater 2b, the strip 5 spring oven and through the device 6 in the opposite direction 11 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.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.

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.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.

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.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 during cooling 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 way, 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. figure 6 . As can be appreciated in this figure, this configuration allows a gradual 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 driver 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

11
NettoyageCleaning
22
ChauffageHeater
2a2a
PréchauffageWarming
2b2b
Chauffage principalMain heating
33
RefroidissementCooling
44
Système de recuit en continuContinuous annealing system
55
Bande d'acierSteel strip
5a5a
Segment de la bande en cours de préchauffageSegment of the band being preheated
5b5b
Segment de la bande en cours de refroidissementSegment of the band being cooled
66
Dispositif de transmission de chaleurHeat transmission device
77
Four à tubes radiantsRadiant tube furnace
88
Tubes radiantsRadiant tubes
99
Ouverture d'entréeOpening entrance
1010
Sens de défilement de la bande en cours de préchauffageDirection of travel of the web during preheating
1111
Sens de défilement de la bande en cours de refroidissementDirection of scrolling of the band during cooling
1212
Ouverture de sortieExit opening
1313
Rouleau conducteurConductive roller
1414
Rouleau déflecteurDeflector roll
1515
Courbe de préchauffagePreheating curve
1616
Courbe de refroidissementCooling curve
1717
Températures des rouleaux conducteursConductive roller temperatures
Table 1 : Paramètres de fonctionnement du dispositif 6Table 1: Device 6 Operating Parameters Position du rouleau conducteur 13Position of the driving roller 13 1 er1 st 2ème2nd 3ème3rd 4ème4th 5ème5th 6ème6th 7ème7th Angle de contact α avec segment 5a [°]Contact angle α with segment 5a [°] 31,431.4 62,962.9 62,962.9 62,962.9 62,962.9 62,962.9 31,431.4 Coefficient de contact avec segment 5a [%]Coefficient of contact with segment 5a [%] 16,316.3 16,316.3 16,316.3 16,316.3 16,316.3 16,316.3 16,316.3 Surface de contact avec segment 5a [m2]Contact surface with segment 5a [m 2 ] 0,03580.0358 0,07160.0716 0,07160.0716 0,07160.0716 0,07160.0716 0,07160.0716 0,03580.0358 Angle de contact α avec segment 5b [°]Contact angle α with segment 5b [°] 35,735.7 71,571.5 71,571.5 71,571.5 71,571.5 71,571.5 35,735.7 Coefficient de contact avec segment 5b [%]Contact coefficient with segment 5b [%] 16,316.3 16,316.3 16,316.3 16,316.3 16,316.3 16,316.3 16,316.3 Surface de contact avec segment 5b [m2]Contact surface with segment 5b [m 2 ] 0,04070.0407 0,08130.0813 0,08130.0813 0,08130.0813 0,08130.0813 0,08130.0813 0,04070.0407 Température initiale du segment 5a[°C]Initial temperature of segment 5a [° C] 3030 64,364.3 138,1138.1 210,6210.6 286,3286.3 353,8353.8 415,4415.4 Température de sortie du segment 5a [°C]Segment outlet temperature 5a [° C] 64,364.3 138,1138.1 210,6210.6 286,3286.3 353,8353.8 415,4415.4 442,2442.2 Chaleur transmise à la bande 5 [kcal/h]Heat transmitted to band 5 [kcal / h] 425775425775 914931914931 898273898273 880617880617 840611840611 805057805057 363114363114 Température initiale du segment 5b [°C]Initial temperature of segment 5b [° C] 482,2482.2 549,7549.7 614,2614.2 675,6675.6 730,4730.4 778,7778.7 800,0800.0 Température de sortie du segment 5b [°C]Segment 5b outlet temperature [° C] 449,8449.8 482,2482.2 549,7549.7 614,2614.2 675,6675.6 730,4730.4 778,7778.7 Chaleur reçue de la bande 5 [kcal/h]Heat received from band 5 [kcal / h] 453947453947 973283973283 953595953595 927897927897 886571886571 847638847638 384988384988

Claims (14)

  1. A method for the heat treatment of a moving metal strip (5), comprising:
    - heating (2a, 2b) of the strip (5),
    - cooling (3) of the heated strip (5), and
    - transfer of heat from 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 part of each of the said cooling and heating (3; 2a, 2b) of the strip,
    and characterised in that the said heat transfer takes place mainly by conduction.
  2. A method according to the preceding claim, wherein the said heat transfer is effected from a plurality of segments (5a) of the strip (5) being heated to a plurality of segments (5b) of the strip (5) being cooled in reverse order in the direction of travel of the strip (5).
  3. A method according to claim 1, wherein, in the said step (2a, 2b) of heating the strip, the strip is also heated by a heat source external to the strip.
  4. A method according to any one of the preceding claims, wherein the said heat transfer is effected by means of at least one heat-conducting solid element in contact with a segment (5a) of the strip (5) being heated and a segment (5b) of the strip (5) being cooled.
  5. A method according to claim 4, wherein the said at least one heat-conductive solid element is in the form of a roller (13), preferably metal.
  6. A method according to claim 5, wherein the segment (5b) of the strip (5) being cooled is in contact with the said roller (13) at a contact angle of at least 20°, preferably at least 30°.
  7. A method according to either one of claims 5 or 6, wherein the segment (5a) of the strip (5) being heated is in contact with the said roller (13) at a contact angle of at least 20°, preferably at least 30°.
  8. A method according to any one of the preceding claims, wherein the difference in temperature between a segment (5b) of the metal strip (5) being cooled and a segment (5a) of the strip (5) being heated between which at least part of the heat transfer takes place by conduction is at least 200°C.
  9. A method according to any one of the preceding claims, wherein the difference in temperature between a segment (5b) of the metal strip (5) being cooled and a segment (5a) of the strip (5) being heated between which at least part of the said heat transfer takes place by conduction is below 500°C.
  10. A heat transmission device (6) for simultaneously heating a moving metal strip (5) upstream of a main heating zone (7) and cooling it downstream of the said main heating zone (7), characterised in that it comprises at least one heat-conductive solid element that is in contact with the said metal strip (5) both upstream and downstream of the main heating zone (7), so as to transfer heat by 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. A device (6) according to claim 10, comprising a series of several heat-conductive solid elements for successively contacting the said metal strip (5) upstream and, in reverse order in the direction of travel of the strip (5), downstream of the main heating zone (7), so as to transfer heat by conduction between segments (5b) of the metal strip (5) downstream and segments (5a) of the metal strip (5) upstream.
  12. A device (6) according to one of claim 10 or 11, wherein said at least one heat-conductive solid element is in the form of a roller (13), preferably metal.
  13. A device (6) according to any one of claims 10 to 12, also comprising at least one deflector roller (14) in order to define a contact angle between the said metal strip (5) upstream and/or downstream of the main heating zone (7) and the said heat-conductive solid element in the form of a roller (13).
  14. A system for the continuous heat treatment, in particular annealing, of a moving metal strip (5), comprising a main heating zone (7) and a heat transmission device (6) according to one of claims 10 to 13.
EP08774880A 2007-07-12 2008-07-08 Method, device and system for the heat treatment of a running metal strip Active EP2171105B1 (en)

Priority Applications (1)

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BE2007/0348A BE1017683A3 (en) 2007-07-12 2007-07-12 METHOD, DEVICE AND SYSTEM FOR THERMALLY TREATING A TILTED METAL STRIP.
PCT/EP2008/058835 WO2009007362A1 (en) 2007-07-12 2008-07-08 Method, device and system for the heat treatment of a running metal strip

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CN (1) CN101743331B (en)
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EP3181538A1 (en) 2015-12-15 2017-06-21 Fertinagro Nutrientes, S.L. Fertiliser composition including metal ions complexed with amino acids to improve the solubilization of phosphorus by the microorganisms present in the soil

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EP2459758B1 (en) 2009-07-27 2016-09-14 Tata Steel Nederland Technology B.V. Heat pipe assisted strip heat treatment
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DE102015113407B4 (en) 2015-08-13 2018-01-11 Ebner Industrieofenbau Gmbh Furnace apparatus for heat treating a metal board
CN109797278A (en) * 2019-03-20 2019-05-24 安徽智磁新材料科技有限公司 Ultrathin nanometer crystal zone material multistage annealing device

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US4588378A (en) * 1983-11-18 1986-05-13 Chugai Ro Co., Ltd. Continuous heat treating furnace for metallic strip
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EP3181538A1 (en) 2015-12-15 2017-06-21 Fertinagro Nutrientes, S.L. Fertiliser composition including metal ions complexed with amino acids to improve the solubilization of phosphorus by the microorganisms present in the soil
WO2017103299A1 (en) 2015-12-15 2017-06-22 Fertinagro Nutrientes, S.L. Fertiliser composition comprising divalent metal ions of copper, manganese and iron complexed wiht amino acids to improve the ability of soil microorganisms to solubilize phosphorus

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US20100186940A1 (en) 2010-07-29
CN101743331A (en) 2010-06-16
BE1017683A3 (en) 2009-03-03
CN101743331B (en) 2012-03-28
ES2355695T3 (en) 2011-03-30
ATE488608T1 (en) 2010-12-15
WO2009007362A1 (en) 2009-01-15
DE602008003585D1 (en) 2010-12-30
EP2171105A1 (en) 2010-04-07

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