EP0350356A1 - Furnace lintel - Google Patents

Furnace lintel Download PDF

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Publication number
EP0350356A1
EP0350356A1 EP19890401731 EP89401731A EP0350356A1 EP 0350356 A1 EP0350356 A1 EP 0350356A1 EP 19890401731 EP19890401731 EP 19890401731 EP 89401731 A EP89401731 A EP 89401731A EP 0350356 A1 EP0350356 A1 EP 0350356A1
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EP
European Patent Office
Prior art keywords
tubes
lintel
oven
heat transfer
transfer fluid
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19890401731
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German (de)
French (fr)
Inventor
Jean Varnoux
Gérard Godet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fives Stein SA
Original Assignee
Stein Heurtey SA
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Filing date
Publication date
Application filed by Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP0350356A1 publication Critical patent/EP0350356A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0041—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for only one medium being tubes having parts touching each other or tubes assembled in panel form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • F27D1/1866—Door-frames
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein

Definitions

  • the present invention relates to an oven lintel in particular for metallurgical heat treatments.
  • ovens comprising a cooled lintel.
  • oven lintels produced up to now pose problems with regard to the behavior over time depending on the regimes.
  • the controlled cooling solutions of the lintels usually used call for either an air sweep of the lintel made up of hollow beam or an organized circulation of water inside this same hollow beam; water can either fill the entire cavity thus formed or circulate in tubes themselves embedded in insulating materials.
  • Publication DE-A-1027704 describes a beam of the type mentioned above, in which a refrigerant circulates, this beam being constituted by a supporting frame of very thick sheets, on which are fixed tubes traversed by the refrigerating agent.
  • the beam described in this publication applies to heating installations and it makes it possible, to a certain extent, to solve the problems of resistance to high temperatures on the one hand and to significant mechanical forces on the other hand, which one encountered in such facilities.
  • these beams of known type do not make it possible to solve the problems mentioned above, resulting from the overheating of the metal parts and from their corrosion.
  • this invention proposes to provide a solution to these problems.
  • an oven lintel of the type consisting of a hollow box provided with tubes in which a heat transfer fluid circulates, characterized in that the walls of said box consist of the tubes in which the heat transfer fluid flows and by welded flat irons on the tubes and intersecting the latter, and in that the protection of said walls against radiation and convection of smoke from the oven is obtained by a refractory lining maintained by a metal frame on which the flat spacers are fixed.
  • the oven lintel object of the present invention, it is possible to maintain a homogeneous temperature at a predetermined level whatever the state of the materials, insulating or refractory, which protect the lintel from radiation and from convection of the oven atmosphere.
  • the inertia of the hollow box which constitutes the lintel according to the invention is equivalent to or even greater than that of a conventional lintel made of sheets and profiles while being of a lower weight.
  • the temperature of the walls of the box is controlled by the speed and the pressure of circulation of the heat transfer fluid inside the tubes of the box.
  • the heat transfer fluid can be either water or a mixed water / vapor phase.
  • the transfer coefficients between heat transfer fluid and tubes are very much greater than the transfer coefficients between the lining and the walls of the box or even, in the event of partial destruction of these linings, between the enclosure and the wall, the temperature of the latter is imposed by the conditions of temperature and speed of the heat transfer fluid, the thickness of the tubes and flat braced bars as well as the method of welding the dishes on the tubes; the temperature of the water coolant or mixed water / vapor phase is itself linked to the recirculation rate and to the pressure of the lintel supply loop.
  • this lintel 3 is produced in the form of a hollow box whose walls consist of tubes 4 connected by spacers produced in the form of flat bars such as 5, welded to the tubes 4. using conventional means (not shown in the drawing) a heat transfer fluid is circulated inside the tubes 4 so as to cool the lintel.
  • This heat transfer fluid can be water or a water / vapor phase.
  • the tubes 4 are connected in series, the entry of the heat transfer fluid being effected by the tubes located at the lower part of the lintel.
  • the tubes 4 are connected in parallel, the entry of the heat transfer fluid is effected by the tubes which are located at the bottom of the lintel.
  • the tubes 4 can be simple tubes with direct passage of the heat-transfer fluid as illustrated by FIGS. 1 to 3, or else they can be produced in the form of double, concentric tubes 4a, 4b as illustrated by FIG. 4, this variant being provided more particularly in the event of significant calorific intake.
  • the heat transfer fluid can penetrate through the internal tubes 4b and exit through the external tubes 4a, as illustrated in FIG. 4 or vice versa.
  • the lintel is held using upper 9 and lower 10 supports and it is protected from radiation and convection of hot smoke by a refractory lining such as 6, 7 held in place using a metal frame 8.
  • the invention makes it possible to achieve controlled cooling of the lintel, the temperature of the walls of the latter being able to be controlled by the speed and the pressure of circulation of the heat transfer fluid inside the tubes. box, by setting the equilibrium temperature of these walls to a value higher than the acid dew point of the fumes from the oven and lower than the temperature at which the metal constituting the walls of the box loses its mechanical characteristics.
  • the invention makes it possible to check at any time the state of the cooled lintel described above by controlling the flow rate, the pressure and the temperature of the hot water or of the steam produced by the lintel, during cooling, in order to to know at all times the heat flow between the oven and its lintel and to deduce the state of the latter.

Abstract

Furnace lintel of the type formed by a hollow caisson provided with tubes in which a heat-exchanging fluid circulates. The walls of the caisson (3) are formed by tubes (4) in which the heat-exchanging fluid circulates, and by flat irons (5) welded to the tubes and spacing the latter. The protection of the walls against radiation and against the convection of the furnace fumes is obtained by a refractory lining (6-7) held by a metal frame (8) to which the flat spacer irons (5) are fixed. <IMAGE>

Description

La présente invention est relative à un linteau de four notamment pour traitements thermiques en métallurgie.The present invention relates to an oven lintel in particular for metallurgical heat treatments.

Il est connu d'utiliser des fours comportant un linteau refroidi. Mais les linteaux de four réalisés jusqu'à présent posent des problèmes en ce qui concerne le comportement en la tenue dans le temps en fonction des régimes.It is known to use ovens comprising a cooled lintel. However, the oven lintels produced up to now pose problems with regard to the behavior over time depending on the regimes.

Les incidents les plus fréquemment rencontrés sont liés à la surchauffe des parties métalliques du linteau ou au contraire à la corrosion de ces parties métalliques du fait de la condensation de fumées acides quand les gaz chauds issus de l'enceinte du four peuvent circuler entre le linteau et le garnissage par les fissures des matériaux constituant le garnissage, fissures généralement provoquées par le vieillissement des différents composants du four et par les variations dimensionnelles dues aux dilatations différentielles entre le linteau, que est en principe à une température constante, et son environnement dont la température varie avec les différents cas de marche et arrêts.The most frequently encountered incidents are linked to the overheating of the metal parts of the lintel or, on the contrary, to the corrosion of these metal parts due to the condensation of acid fumes when the hot gases coming from the oven enclosure can circulate between the lintel. and the lining by the cracks in the materials constituting the lining, cracks generally caused by the aging of the various components of the furnace and by the dimensional variations due to the differential expansions between the lintel, which is in principle at a constant temperature, and its environment, the temperature varies with different start and stop cases.

Les solutions de refroidissement contrôlé des linteaux habituellement utilisés font appel soit à un balayage par l'air du linteau constitué en poutre creuse soit à une circulation organisée d'eau à l'intérieur de cette même poutre creuse ; l'eau peut soit remplir la totalité de la cavité ainsi constituée soit circuler dans des tubes eux-mêmes noyés dans des matériaux isolants.The controlled cooling solutions of the lintels usually used call for either an air sweep of the lintel made up of hollow beam or an organized circulation of water inside this same hollow beam; water can either fill the entire cavity thus formed or circulate in tubes themselves embedded in insulating materials.

La publication DE-A-1027704 décrit une poutre du type mentionné ci-­dessus, dans laquelle circule un agent de réfrigération, cette poutre étant constituée par un châssis porteur en tôles de forte épaisseur, sur lequel sont fixés des tubes parcourus par l'agent de réfrigération. La poutre décrite dans cette publication s'applique aux installations de chauffage et elle permet, dans une certaine mesure, de résoudre les problèmes de la résistance aux fortes températures d'une part et aux efforts mécaniques importants d'autre part, que l'on rencontre dans de telles installations. Cependant, ces poutres de type connu ne permettent pas de résoudre les problèmes mentionnés ci-­dessus, résultant de la surchauffe des parties métalliques et de leur corrosion.Publication DE-A-1027704 describes a beam of the type mentioned above, in which a refrigerant circulates, this beam being constituted by a supporting frame of very thick sheets, on which are fixed tubes traversed by the refrigerating agent. The beam described in this publication applies to heating installations and it makes it possible, to a certain extent, to solve the problems of resistance to high temperatures on the one hand and to significant mechanical forces on the other hand, which one encountered in such facilities. However, these beams of known type do not make it possible to solve the problems mentioned above, resulting from the overheating of the metal parts and from their corrosion.

En conséquence, cette invention se propose d'apporter une solution à ces problèmes.Consequently, this invention proposes to provide a solution to these problems.

Elle a pour objet un linteau de four du type constitué par un caisson creux pourvu de tubes dans lesquels circule un fluide caloporteur, caractérisé en ce que les parois dudit caisson sont constituées par les tubes dans lesquels circule le fluide caloporteur et par des fers plats soudés sur les tubes et entretroisant ces derniers, et en ce que la protection desdites parois à l'encontre du rayonnement et de la convection des fumées du four est obtenue par un garnissage réfractaire maintenu par un cadre métallique sur lequel sont fixés les fers plats entretoises.It relates to an oven lintel of the type consisting of a hollow box provided with tubes in which a heat transfer fluid circulates, characterized in that the walls of said box consist of the tubes in which the heat transfer fluid flows and by welded flat irons on the tubes and intersecting the latter, and in that the protection of said walls against radiation and convection of smoke from the oven is obtained by a refractory lining maintained by a metal frame on which the flat spacers are fixed.

Lors de la mise en oeuvre d'un tel linteau refroidi, il est possible, en calculant les transferts entre le linteau refroidi et son environnement, de déterminer les débits de fluide caloporteur et les températures respectives des différents éléments du linteau. Les flux sont déterminés pour des cas de marche précis et les résistances au transfert ; les coefficients d'échange sont imposés par les conditions de transfert entre le fluide caloporteur et son enceinte : des compromis doivent être trouvés entre les différents cas de marche, ce qui immanquablement se traduit soit par des températures trop élevées dans les régimes transitoires ou en cas de dégradation du garnissage soit au contraire par des températures trop basses entraînant des condensation avec pour corollaire la corrosion et la destruction progresssive du linteau.During the implementation of such a cooled lintel, it is possible, by calculating the transfers between the cooled lintel and its environment, to determine the flow rates of heat transfer fluid and the respective temperatures of the various elements of the lintel. The fluxes are determined for specific market cases and the resistance to transfer; the exchange coefficients are imposed by the transfer conditions between the heat transfer fluid and its enclosure: compromises have to be found between the different operating cases, which inevitably results either in excessively high temperatures in the transient regimes or in case deterioration of the lining, on the contrary, by too low temperatures causing condensation with corollary corrosion and progressive destruction of the lintel.

Au contraire, dans le linteau de four, objet de la présente invention on peut maintenir une température homogène à un niveau prédéterminé quel que soit l'état des matériaux, isolants ou réfractaires, qui protègent le linteau du rayonnement et de la convection de l'atmosphère du four.On the contrary, in the oven lintel, object of the present invention, it is possible to maintain a homogeneous temperature at a predetermined level whatever the state of the materials, insulating or refractory, which protect the lintel from radiation and from convection of the oven atmosphere.

L'inertie du caisson creux qui constitue le linteau selon l'invention est équivalente ou même supérieure à celle d'un linteau classique en tôles et profilés tout en étant d'un poids inférieur. Selon l'invention, la température des parois du caisson est contrôlée par la vitesse et la pression de circulation du fluide caloporteur à l'intérieur des tubes du caisson. En fonction des conditions d'exploitation et en particulier de la température du four et de la composition des fumées, le fluide caloporteur peut être soit de l'eau soit une phase mixte eau/vapeur. Compte tenu du fait que les coefficients de transfert entre fluide caloporteur et tubes sont très nettement supérieurs au coefficients de transfert entre le garnissage et les parois du caisson ou même, en cas de destruction partielle de ces garnissages, entre l'enceinte et la paroi, la température de cette dernière est imposée par les conditions de température et de vitesse du fluide caloporteur, l'épaisseur des tubes et des fers plats entretoisés ainsi que le mode de soudage des plats sur les tubes ; la température du fluide caloporteur eau ou phase mixte eau/vapeur est elle-même liée au taux de recirculation et à la pression de la boucle d'alimentation du linteau. Il est ainsi possible selon l'invention, en fonction des risques de corrosion, dûs à la présence de composés du soufre dans le cas de combustibles ou à la présence de dérivés halogénés dans les fumées, de fixer la température d'équilibre des parois du caisson même en cas de dégarnissage partiel afin de maintenir la température du métal à une température toujours supérieure au point de rosée acide des fumées et toujours inférieure à la température à laquelle le métal constituant les parois du caisson n'aurait plus les caractéristiques mécaniques désirées.The inertia of the hollow box which constitutes the lintel according to the invention is equivalent to or even greater than that of a conventional lintel made of sheets and profiles while being of a lower weight. According to the invention, the temperature of the walls of the box is controlled by the speed and the pressure of circulation of the heat transfer fluid inside the tubes of the box. Depending on the operating conditions and in particular the oven temperature and the smoke composition, the heat transfer fluid can be either water or a mixed water / vapor phase. Given the fact that the transfer coefficients between heat transfer fluid and tubes are very much greater than the transfer coefficients between the lining and the walls of the box or even, in the event of partial destruction of these linings, between the enclosure and the wall, the temperature of the latter is imposed by the conditions of temperature and speed of the heat transfer fluid, the thickness of the tubes and flat braced bars as well as the method of welding the dishes on the tubes; the temperature of the water coolant or mixed water / vapor phase is itself linked to the recirculation rate and to the pressure of the lintel supply loop. It is thus possible according to the invention, as a function of the risks of corrosion, due to the presence of sulfur compounds in the case of fuels or to the presence of halogenated derivatives in the fumes, to fix the equilibrium temperature of the walls of the casing even in the event of partial stripping in order to maintain the temperature of the metal at a temperature always above the acid dew point of the fumes and always below the temperature at which the metal constituting the walls of the casing would no longer have the desired mechanical characteristics.

On a décrit ci-après, à titre d'exemples non limitatifs, des modes de réalisation du linteau selon l'invention, avec référence aux dessins annexés sur lesquels :

  • - la figure 1 est une vue en perspective du linteau selon l'invention; - la figure 2 est une vue en coupe transversale de la figure 1 ; - la figure 3 illustre une variante du linteau du linteau selon l'invention en une vue selon la figure 1 ; - la figure 4 est une vue schématique partielle qui illustre une variante des tubes de refroidissement du linteau en cas d'apport calorifique important.
Embodiments of the lintel according to the invention have been described below, by way of non-limiting examples, with reference to the appended drawings in which:
  • - Figure 1 is a perspective view of the lintel according to the invention; - Figure 2 is a cross-sectional view of Figure 1; - Figure 3 illustrates a variant of the lintel of the lintel according to the invention in a view according to Figure 1; - Figure 4 is a partial schematic view which illustrates a variant of the lintel cooling tubes in the event of significant heat input.

Es se référant aux dessins et notamment aux figures 1 à 3, on voit en 1 la paroi d'un four, notamment d'un four de traitements thermiques pour produits métallurgiques, qui est munie d'une ouverture d'accès 2. Cette dernière est surmontée d'un linteau désigné dans son ensemble par la référence 3.Es referring to the drawings and in particular to Figures 1 to 3, we see in 1 the wall of an oven, in particular of a heat treatment oven for metallurgical products, which is provided with an access opening 2. The latter is surmounted by a lintel designated as a whole by the reference 3.

Selon l'invention, ce linteau 3 est réalisé sous la forme d'un caisson creux dont les parois sont constituées de tubes 4 raccordés par des entretoises réalisées sous la forme de fers plats tels que 5, soudés sur les tubes 4. A l'aide de moyens classiques (non représentés sur le dessin) on fait circuler un fluide caloporteur à l'intérieur des tubes 4 de façon à assurer le refroidissement du linteau. Ce fluide caloporteur peut être de l'eau ou une phase eau/vapeur.According to the invention, this lintel 3 is produced in the form of a hollow box whose walls consist of tubes 4 connected by spacers produced in the form of flat bars such as 5, welded to the tubes 4. using conventional means (not shown in the drawing) a heat transfer fluid is circulated inside the tubes 4 so as to cool the lintel. This heat transfer fluid can be water or a water / vapor phase.

Dans l'exemple de réalisation illustré par la figure 1, les tubes 4 sont reliés en série, l'entrée du fluide caloporteur s'effectuant par les tubes situés à la partie inférieure du linteau.In the embodiment illustrated in FIG. 1, the tubes 4 are connected in series, the entry of the heat transfer fluid being effected by the tubes located at the lower part of the lintel.

Dans l'exemple de réalisation représenté sur la figure 3, les tubes 4 sont reliés en parallèles, l'entrée du fluide caloporteur s'effectuant par les tubes qui sont situés à la partie inférieure du linteau.In the embodiment shown in Figure 3, the tubes 4 are connected in parallel, the entry of the heat transfer fluid is effected by the tubes which are located at the bottom of the lintel.

Les tubes 4 peuvent être des tubes simples à passage direct du fluide caloporteur comme illustré par les figures 1 à 3, ou bien ils peuvent être réalisés sous la forme de tubes doubles, concentriques 4a, 4b comme illustré par la figure 4, cette variante étant prévue plus particulièrement en cas d'apport calorifique important. Dans cette variante, le fluide caloporteur peut pénétrer par les tubes internes 4b et ressortir par les tubes externes 4a, comme illustré sur la figure 4 ou inversement.The tubes 4 can be simple tubes with direct passage of the heat-transfer fluid as illustrated by FIGS. 1 to 3, or else they can be produced in the form of double, concentric tubes 4a, 4b as illustrated by FIG. 4, this variant being provided more particularly in the event of significant calorific intake. In this variant, the heat transfer fluid can penetrate through the internal tubes 4b and exit through the external tubes 4a, as illustrated in FIG. 4 or vice versa.

Le linteau est maintenu à l'aide d'appuis supérieurs 9 et inférieurs 10 et il est protégé du rayonnement et de la convection des fumées chaudes par un garnissage réfractaire tel que 6, 7 maintenu en place à l'aide d'un cadre métallique 8.The lintel is held using upper 9 and lower 10 supports and it is protected from radiation and convection of hot smoke by a refractory lining such as 6, 7 held in place using a metal frame 8.

Ainsi qu'on la précise ci-dessus, l'invention permet de réaliser un refroidissement contrôlé du linteau, la température des parois de ce dernier pouvant être contrôlée par la vitesse et la pression de circulation du fluide caloporteur à l'intérieur des tubes de caisson, en fixant la température d'équilibre de ces parois à une valeur supérieure au point de rosée acide des fumées du four et inférieure à la température à laquelle le métal constituant les parois du caisson perd ses caractéristiques mécaniques.As specified above, the invention makes it possible to achieve controlled cooling of the lintel, the temperature of the walls of the latter being able to be controlled by the speed and the pressure of circulation of the heat transfer fluid inside the tubes. box, by setting the equilibrium temperature of these walls to a value higher than the acid dew point of the fumes from the oven and lower than the temperature at which the metal constituting the walls of the box loses its mechanical characteristics.

De même l'invention permet de vérifier à tout moment l'état du linteau refroidi décrit ci-dessus en contrôlant le débit, la pression et la température de l'eau chaude ou de la vapeur produite par le linteau, lors du refroidissement, afin de connaître à tout instant le flux de chaleur entre le four et son linteau et d'en déduire l'état de ce dernier.Likewise, the invention makes it possible to check at any time the state of the cooled lintel described above by controlling the flow rate, the pressure and the temperature of the hot water or of the steam produced by the lintel, during cooling, in order to to know at all times the heat flow between the oven and its lintel and to deduce the state of the latter.

Claims (9)

1- Linteau de four du type constitué par un caisson creux pourvu de tubes dans lesquels circule un fluide caloporteur, caractérisé en ce que les parois dudit caisson (3) sont constituées par les tubes (4) dans lesquels circule le fluide caloporteur et par des fers plats (5) soudés sur les tubes et entretoisant ces derniers, et en ce que la protection desdites parois à l'encontre du rayonnement et de la convection des fumées du four est obtenue par un garnissage réfractaire (6-7) maintenu par un cadre métallique (8) sur lequel sont fixés les fers plats entretoises (5).1- Oven lintel of the type consisting of a hollow box provided with tubes in which a heat transfer fluid circulates, characterized in that the walls of said box (3) are constituted by the tubes (4) in which the heat transfer fluid circulates and by flat bars (5) welded to the tubes and bracing them, and in that the protection of said walls against radiation and convection of smoke from the oven is obtained by a refractory lining (6-7) maintained by a metal frame (8) on which are fixed the flat bars spacers (5). 2- Linteau de four selon la revendication 1 caractérisé en ce que les tubes (4) sont reliés en série.2- Oven lintel according to claim 1 characterized in that the tubes (4) are connected in series. 3- Linteau de four selon la revendication 1 caractérisé en ce que les tubes (4) sont reliés en parallèle.3- Oven lintel according to claim 1 characterized in that the tubes (4) are connected in parallel. 4- Linteau de four selon l'une quelconque des revendications précédentes caractérisé en ce que les tubes (4) sont des tubes simples à passage direct du fluide caloporteur.4- Oven lintel according to any one of the preceding claims, characterized in that the tubes (4) are simple tubes with direct passage of the heat transfer fluid. 5- Linteau de four selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les tubes sont des tubes doubles comprenant des tubes internes et des tubes externes dans lesquels le fluide caloporteur pénètre par les tubes internes et ressort par les tubes externes ou inversement.5- Oven lintel according to any one of claims 1 to 3, characterized in that the tubes are double tubes comprising internal tubes and external tubes in which the heat transfer fluid enters through the internal tubes and exits through the external tubes Or vice versa. 6- Procédé de refroidissement contrôlé d'un linteau de four selon l'une quelconque des revendications précédentes caractérisé en ce que la température des parois du caisson (3) est contrôlée par la vitesse et la pression de circulation du fluide caloporteur à l'intérieur des tubes du caisson, en fixant la température d'équilibre desdites parois à une valeur supérieure au point de rosée acide des fumées et inférieure à la température à laquelle le métal constituant les parois du caisson perd ses caractéristiques mécaniques.6- Controlled cooling process of an oven lintel according to any one of the preceding claims, characterized in that the temperature of the walls of the box (3) is controlled by the speed and the pressure of circulation of the heat transfer fluid inside. casing tubes, by setting the equilibrium temperature of said walls at a value higher than the acid dew point of the smoke and lower than the temperature at which the metal constituting the walls of the box loses its mechanical characteristics. 7- Procédé selon la revendication 6, caractérisé en ce que le fluide caloporteur est de l'eau.7- A method according to claim 6, characterized in that the heat transfer fluid is water. 8- Procédé selon la revendication 6, caractérisé en ce que le fluide caloporteur est constitué par une phase eau/vapeur.8- A method according to claim 6, characterized in that the heat transfer fluid consists of a water / vapor phase. 9- Procédé de contrôle de l'état d'un linteau refroidi par circulation d'un fluide caloporteur selon l'une quelconque des revendications 1 à 5 et conformément au procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que l'on contrôle le débit, la pression et la température de l'eau chaude ou de la vapeur produite par le linteau afin de connaître à tout instant le flux de chaleur entre le four et le linteau et d'en déduire l'état de ce dernier.9- A method for controlling the state of a lintel cooled by circulation of a heat transfer fluid according to any one of claims 1 to 5 and in accordance with the method according to any one of claims 6 to 8, characterized in that we control the flow, pressure and temperature of the hot water or steam produced by the lintel in order to know at all times the heat flow between the oven and the lintel and to deduce the state of this last.
EP19890401731 1988-07-05 1989-06-19 Furnace lintel Withdrawn EP0350356A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809699A FR2634009B1 (en) 1988-07-05 1988-07-05 LINEN FOR OVEN OPENING
FR8809699 1988-07-05

Publications (1)

Publication Number Publication Date
EP0350356A1 true EP0350356A1 (en) 1990-01-10

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EP19890401731 Withdrawn EP0350356A1 (en) 1988-07-05 1989-06-19 Furnace lintel

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EP (1) EP0350356A1 (en)
DE (1) DE350356T1 (en)
ES (1) ES2012443A4 (en)
FR (1) FR2634009B1 (en)
GR (1) GR900300033T1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614545A (en) * 1949-12-30 1952-10-21 Harry F Nulph Water-cooled lintel and skewback channel cooler
DE1027704B (en) * 1955-01-07 1958-04-10 Mont Kessel Herpen & Co Komman Cooling bars for firing and furnace systems
DE1116253B (en) * 1956-09-14 1961-11-02 Babcock & Wilcox Dampfkessel High pressure door cooler frame
GB900990A (en) * 1957-05-18 1962-07-11 Vorkauf Heinrich Improvements in and relating to cooled door frames for siemens-martin open-hearth furnaces or the like
GB2009898A (en) * 1977-12-06 1979-06-20 Sanyo Special Steel Co Ltd Water-cooled panel for use in an electric furnace

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614545A (en) * 1949-12-30 1952-10-21 Harry F Nulph Water-cooled lintel and skewback channel cooler
DE1027704B (en) * 1955-01-07 1958-04-10 Mont Kessel Herpen & Co Komman Cooling bars for firing and furnace systems
DE1116253B (en) * 1956-09-14 1961-11-02 Babcock & Wilcox Dampfkessel High pressure door cooler frame
GB900990A (en) * 1957-05-18 1962-07-11 Vorkauf Heinrich Improvements in and relating to cooled door frames for siemens-martin open-hearth furnaces or the like
GB2009898A (en) * 1977-12-06 1979-06-20 Sanyo Special Steel Co Ltd Water-cooled panel for use in an electric furnace

Also Published As

Publication number Publication date
FR2634009A1 (en) 1990-01-12
DE350356T1 (en) 1990-05-23
FR2634009B1 (en) 1993-09-17
ES2012443A4 (en) 1990-04-01
GR900300033T1 (en) 1991-07-31

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