EP0383687A1 - Radiant tube system for heating furnaces - Google Patents

Radiant tube system for heating furnaces Download PDF

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Publication number
EP0383687A1
EP0383687A1 EP90400409A EP90400409A EP0383687A1 EP 0383687 A1 EP0383687 A1 EP 0383687A1 EP 90400409 A EP90400409 A EP 90400409A EP 90400409 A EP90400409 A EP 90400409A EP 0383687 A1 EP0383687 A1 EP 0383687A1
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EP
European Patent Office
Prior art keywords
elbow
tubes
cold
radiant
tube
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
EP90400409A
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German (de)
French (fr)
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EP0383687B1 (en
Inventor
Bernard Dubreuil
Gérard Jodet
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Fives Stein SA
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Stein Heurtey SA
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Publication of EP0383687A1 publication Critical patent/EP0383687A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • 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
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/068—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by radiant tubes, the tube being heated by a hot medium, e.g. hot gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies

Definitions

  • the present invention relates to improvements made to the systems of radiant tubes used in particular in the furnaces for heating strips of metal products in the procession.
  • radiant tubes generally having a W configuration, also called a double pin, are generally used, these tubes ensuring the thermal transfer between the combustion gases emitted by a burner and the product to be heated, in particular a metal strip. continuously moving. The heat transfer takes place by radiation between the radiant tube system and the product to be heated and by convection / radiation inside the radiant tubes.
  • the combustion gases at the outlet of the radiant tube system have a temperature of around 1000 ° C while the temperature of the radiant tubes is on average 950 ° C with a local maximum of the order of 1050 ° C.
  • the present licensee has carried out an in-depth study of deformations by thermal expansions as well as of the network of constraints associated with these expansions, these constraints appearing during the heating of the radiant tubes and during operation in stabilized operation or not.
  • the aim of this study was to find the means making it possible to optimize the distribution of the stresses by taking into account the creep resistance of the materials which constitute the system of radiant tubes, this creep resistance varying strongly as a function of the temperature.
  • the present invention therefore relates to a system of radiant tubes which has been improved by taking account of the results of said study.
  • the invention relates to a system of radiant tubes of the double pin or W type used in heating furnaces, in particular in furnaces for heating metal strips in the runway, to effect the heat transfer between the combustion gases emitted by a burner and the products to be heated, characterized in that: - The burner is positioned in the lower branch of said tubes; - The cold elbow support device, in the upper part of the tubes is made in the form of a simple support; - the cold elbow and the hot elbow are connected to each other without an intermediate piece of the rod type and, - The intermediate elbow and the lower tube are connected to each other with an adjustable clearance between these two elements.
  • the simple support which supports the cold elbow is produced in the form of a console on which the cold elbow rests, before heating the radiant tube, the cold elbow rising to leave this support as soon as heating.
  • the cold elbow and the hot elbow are connected by means of brackets respectively from the foundry with its respective elbow, these brackets being interconnected using a key or the like.
  • the means ensuring the connection on the burner side between the intermediate elbow and the lower tube is produced using a tab from the foundry with this intermediate elbow on which is welded a stirrup-shaped part which can come '' press on the lower tube, an intermediate clearance being provided between the stirrup and the lower tube, the distribution of the stresses of the radiant tube being a function of the value of this intermediate clearance, and the resumption of the force generated by the intermediate elbow being provided by the inferior tube in the part where it is the coldest.
  • the heating furnace is used for the heat treatment of strips, in particular of metal strips 12, 12 ′ moving continuously in the furnace (process on parade).
  • the heating is carried out using radiant tubes whose system has been designated as a whole by the reference 10, this system having as known a configuration in W or double pin.
  • a burner 14 is provided outside the oven enclosure and the combustion gases emitted by this burner pass through the system of radiant tubes 10 before escaping to the atmosphere.
  • the radiant tubes therefore ensure the thermal transfer between the combustion gases emitted by the burner 14 and the product 12, 12 ′ to be heated.
  • the burner 14 is positioned on the lower branch of the system of radiant tubes, that is to say at the end of the lower tube 16 which constitutes the hot tube.
  • the elbow 18 which extends the hot tube 16 constitutes the hot elbow of the system 10.
  • the elbow 20 will be designated hereinafter intermediate elbow and the upper elbow 22 will be designated by cold elbow, this elbow opening onto the upper tube 24 which constitutes the tube cold radiant tube system 10.
  • the cold elbow is provided with a support device the function of which boils down to a simple press.
  • this simple support is produced in the form of a console 28 on which a support plate 26 can come to rest, made integral by any appropriate means with the cold elbow 22.
  • the elbow associated with the support is the cold elbow 22 in which the most important stresses are acceptable.
  • FIG. 3 the variation in the temperature of the tube system 10 is shown as a function of its length, and the position of the respective elbows 18, 20, 22 is plotted on the abscissa.
  • FIG. 4 the variation in the admissible creep stress as a function of the temperature of the tube system 10. This curve shows although the allowable stresses in the cold elbow region are much higher than those acceptable in the hot elbow. Such an arrangement is essential for optimizing the constraint network.
  • connection system between the hot elbow 18 and the cold elbow 22, this connection system being characterized essentially by the fact that it does not comprise any intermediate part (link).
  • the elbow 18 is provided with a square 32 coming directly from the foundry with this hot elbow 18 and likewise the cold elbow 22 is provided with a similar square 30 also come directly from foundry with this cold elbow 22.
  • the brackets 30 and 32 are obtained directly during the casting of the elbows of which they are respectively part. In no case should these brackets be added by welding to the elbows since such welds generate stress concentrations and risks of microcracking at locations where the stresses are maximum during operation.
  • brackets 30 and 32 are connected by means of a connecting piece which can be produced in the form of a key such as 34, the design being such that the games allow relative movements of the hot 18 and cold 22 elbows when warming up, during operation of the oven in stabilized operation and during transients (power variation of the system of radiant tubes 10).
  • the improved radiant tube system according to the present invention also comprises a connection between the intermediate elbow 20 and the hot lower tube 16, burner side 14.
  • a connection between the intermediate elbow 20 and the hot lower tube 16, burner side 14. Such a system visible in FIG. 1 and shown in more detail in FIGS. 7 and 8 is essential for optimizing the distribution of system constraints 10.
  • this connection system comprises a piece 36 in the shape of a tab, coming directly from the foundry with the intermediate elbow 20 (any welding between the elbow 20 and a connection piece such as 36 being prohibited for reasons indicated above with respect to the brackets 30 and 32) and a piece 38 in the shape of a stirrup which can be mounted on the lug 36 by welding since this lug does not support any stress.
  • connection by welding between the plate 36 and the part 38 in the shape of a stirrup is carried out after checking the intermediate clearance "j" between the stirrup 38 and the hot lower tube 16.
  • the subsequent distribution of the components of the system of radiant tubes 10 depends on the value of this infill. In fact, when the oven is warming up, the intermediate elbow 20 approaches the lower tube 16 up to the intermediate clearance "j" produced when cold and its movement is thus limited. This situation corresponds to a mapping of the distribution of the particular constraints for each infill set.
  • connection of the lower 16 and upper 24 tubes with the sheet metal of the furnace can be carried out by any suitable means and in particular by any conventional technique.
  • expansion bellows on one of the branches of the system of radiant tubes 10 brings here more drawbacks than advantages and under these conditions the invention plans to carry out the connection between the lower and upper tubes and the sheet metal of the furnace without using expansion bellows.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Resistance Heating (AREA)
  • Gas Burners (AREA)
  • Pipe Accessories (AREA)
  • Electric Stoves And Ranges (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Baking, Grill, Roasting (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Drying Of Solid Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

System of radiant tubes of the type of double-pin or W type used in heating furnaces, in particular in furnaces for heating metal bands passing continuously, for carrying out the heat transfer between the combustion gases emitted by a burner and the products to be heated, characterised in that - the burner (14) is positioned in the cold part of the tubes (10), that is to say in the lower branch (16) of said tubes; - the support device of the cold bend (22) in the upper part of the tubes is made in the form of a simple support (26, 28); - the cold bend (22) and the hot bend (18) are interconnected without an intermediate welded piece, and - the intermediate bend (20) and the lower tube (16) are interconnected with adjustable play between these two elements. <IMAGE>

Description

La présente invention a pour objet des perfectionnements apportés aux systèmes de tubes radiants utilisés notamment dans les fours de chauffage de bandes de produits métalliques au défilé.The present invention relates to improvements made to the systems of radiant tubes used in particular in the furnaces for heating strips of metal products in the procession.

On sait que dans de telles installations de chauffage on utilise généralement des tubes radiants présentant une configuration en W, encore appelée double épingle, ces tubes assurant le transfert thermique entre les gaz de combustion émis par un brûleur et le produit à chauffer notamment une bande métallique en déplacement continu. Le transfert thermique s'opère par rayonnement entre le système de tubes radiants et le produit à chauffer et par convection/rayonnement à l'intérieur des tubes radiants. Les gaz de combustion à la sortie du système de tubes radiants présentent une température qui avoisine 1000° C alors que la température des tubes radiants est en moyenne de 950° C avec un maximum local de l'ordre de 1050° C.It is known that in such heating installations, radiant tubes generally having a W configuration, also called a double pin, are generally used, these tubes ensuring the thermal transfer between the combustion gases emitted by a burner and the product to be heated, in particular a metal strip. continuously moving. The heat transfer takes place by radiation between the radiant tube system and the product to be heated and by convection / radiation inside the radiant tubes. The combustion gases at the outlet of the radiant tube system have a temperature of around 1000 ° C while the temperature of the radiant tubes is on average 950 ° C with a local maximum of the order of 1050 ° C.

La présente titulaire a réalisé une étude approfondie des déformations par dilatations thermiques ainsi que du réseau de contraintes associé à ces dilatations, ces contraintes apparaîssant lors de la mise en chauffe des tubes radiants et lors du fonctionnement en marche stabilisée ou non . Le but de cette étude était de trouver les moyens permettant d'optimiser la répartition des contraintes en tenant compte de la résistance au fluage des matériaux qui constituent le système de tubes radiants, cette résistance au fluage variant fortement en fonction de la température. La présente invention concerne donc un système de tubes radiants qui a été perfectionné en tenant compte des résultats de ladite étude.The present licensee has carried out an in-depth study of deformations by thermal expansions as well as of the network of constraints associated with these expansions, these constraints appearing during the heating of the radiant tubes and during operation in stabilized operation or not. The aim of this study was to find the means making it possible to optimize the distribution of the stresses by taking into account the creep resistance of the materials which constitute the system of radiant tubes, this creep resistance varying strongly as a function of the temperature. The present invention therefore relates to a system of radiant tubes which has been improved by taking account of the results of said study.

En conséquence l'invention concerne un système de tubes radiants du type à double épingle ou en W utilisé dans des fours de chauffage, notamment dans des fours de chauffage de bandes métalliques au défilé, pour réaliser le transfert thermique entre les gaz de combustion émis par un brûleur et les produits à chauffer caractérisé en ce que :
- le brûleur est posistionné dans la branche inférieure desdits tubes ;
- le dispositif de support du coude froide, en partie supérieure des tubes est réalisée sous la forme d'un appui simple ;
- le coude froid et le coude chaud sont reliés l'un à l'autre sans pièce intermédiaire du type biellette et,
- le coude intermédiaire et le tube inférieur sont reliés l'un à l'autre avec un jeu réglable entre ces deux éléments.Consequently, the invention relates to a system of radiant tubes of the double pin or W type used in heating furnaces, in particular in furnaces for heating metal strips in the runway, to effect the heat transfer between the combustion gases emitted by a burner and the products to be heated, characterized in that:
- The burner is positioned in the lower branch of said tubes;
- The cold elbow support device, in the upper part of the tubes is made in the form of a simple support;
- the cold elbow and the hot elbow are connected to each other without an intermediate piece of the rod type and,
- The intermediate elbow and the lower tube are connected to each other with an adjustable clearance between these two elements.

Selon une caractéristique de cette invention l'appui simple qui supporte le coude froid est réalisé sous la forme d'une console sur laquelle vient reposer le coude froid, avant mise en chaufe du tube radiant, le coude froid se soulevant pour quitter cet appui dès la mise en chauffe.According to one characteristic of this invention, the simple support which supports the cold elbow is produced in the form of a console on which the cold elbow rests, before heating the radiant tube, the cold elbow rising to leave this support as soon as heating.

Selon une autre caractéristique de cette invention le coude froid et le coude chaud sont reliés par l'intermédiaire d'équerres venues respectivement de fonderie avec son coude respectif, ces équerres étant reliées entre elles à l'aide d'une clavette ou similaire.According to another characteristic of this invention, the cold elbow and the hot elbow are connected by means of brackets respectively from the foundry with its respective elbow, these brackets being interconnected using a key or the like.

Selon l'invention le moyen assurant la liaison côté brûleur entre le coude intermédiaire et le tube inférieur est réalisé à l'aide d'une patte venue de fonderie avec ce coude intermédiaire sur laquelle est soudée une pièce en forme d'étrier pouvant venir s'appuyer sur le tube inférieur, un jeu intercalaire étant prévu entre l'étrier et le tube inférieur, la répartition des contraintes du tube radiant étant fonction de la valeur de ce jeu intercalaire, et la reprise de l'effort engendré par le coude intermédiaire étant assurée par le tube inférueur dans la partie où celui-ci est le plus froid.According to the invention, the means ensuring the connection on the burner side between the intermediate elbow and the lower tube is produced using a tab from the foundry with this intermediate elbow on which is welded a stirrup-shaped part which can come '' press on the lower tube, an intermediate clearance being provided between the stirrup and the lower tube, the distribution of the stresses of the radiant tube being a function of the value of this intermediate clearance, and the resumption of the force generated by the intermediate elbow being provided by the inferior tube in the part where it is the coldest.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après en référence aux dessins annexés qui en illustrent un exemple de réalisation dépourvu de tout caractàre limitatif. Sur les dessins :

  • - la figure 1 est une vue schématique en élévation latérale représentant partiellement un four de traitement thermique de bandes au défilé pourvu d'un système de tubes radiants perfectionné selon la présente invention ;
  • la figure 2 est une vue schématique en coupe verticale de la figure 1 ;
  • - la figure 3 représente la courbe de répartition des températures du tubes radiants sur la longueur de ces tubes ;
  • - la figure 4 montre la variation du taux de fluage, c'est-à-­dire de la contrainte qui occasionne une même déformation du tube radiant en fonction de sa température ;
  • - la figure 5 est une vue schématique à plus grande échelle montrant le détail de la liaison entre le coude froid et le coude chaud du système de tubes radiants selon l'invention ;
  • - la figure 6 est une coupe verticale représentant le détail de la liaison entre les coudes froid et chaud conformément à la figure 5;
  • - la figure 7 est une vue schématique à plus grand échelle représentant le détail de la liaison entre le coude intermédiaire et le tube chaud inférieur du système de tubes radiants et,
  • - la figure 8 est une vue en coupe verticale de la figure 7.
Other characteristics and advantages of the present invention will emerge from the description given below with reference to the drawings attached which illustrate an embodiment thereof devoid of any limiting character. In the drawings:
  • - Figure 1 is a schematic side elevational view partially showing a heat treatment furnace for parade bands provided with a system of radiant tubes improved according to the present invention;
  • Figure 2 is a schematic vertical sectional view of Figure 1;
  • - Figure 3 shows the temperature distribution curve of the radiant tubes over the length of these tubes;
  • - Figure 4 shows the variation of the creep rate, that is to say the stress which causes the same deformation of the radiant tube as a function of its temperature;
  • - Figure 5 is a schematic view on a larger scale showing the detail of the connection between the cold elbow and the hot elbow of the system of radiant tubes according to the invention;
  • - Figure 6 is a vertical section showing the detail of the connection between the cold and hot elbows according to Figure 5;
  • FIG. 7 is a diagrammatic view on a larger scale showing the detail of the connection between the intermediate elbow and the lower hot tube of the system of radiant tubes and,
  • - Figure 8 is a vertical sectional view of Figure 7.

En se référant aux dessins on voit que le four de chauffage est utilisé pour le traitement thermique de bandes, notamment de bandes métalliques 12, 12′ se déplaçant en continu dans le four (traitement au défilé). Le chauffage est réalisé à l'aide de tubes radiants dont le système a été désigné dans son ensemble par la référence 10, ce système présentant comme connu une configuration en W ou double épingle. Un brûleur 14 est prévu à l'extérieur de l'enceinte du four et les gaz de combustion émis par ce brûleur parcourent le système de tubes radiants 10 avant de s'échapper vers l'atmosphère. Les tubes radiants assurent donc le transfert thermique entre les gaz de combustion émis par le brûleur 14 et le produit 12, 12′ à chauffer.Referring to the drawings, it can be seen that the heating furnace is used for the heat treatment of strips, in particular of metal strips 12, 12 ′ moving continuously in the furnace (process on parade). The heating is carried out using radiant tubes whose system has been designated as a whole by the reference 10, this system having as known a configuration in W or double pin. A burner 14 is provided outside the oven enclosure and the combustion gases emitted by this burner pass through the system of radiant tubes 10 before escaping to the atmosphere. The radiant tubes therefore ensure the thermal transfer between the combustion gases emitted by the burner 14 and the product 12, 12 ′ to be heated.

Selon l'invention le brûleur 14 est positionné sur la branche inférieure du système de tubes radiants c'est-à-dire à l'extrémité du tube inférieur 16 qui constitue le tube chaud. Le coude 18 qui prolonge le tube chaud 16 constitue le coude chaud du système 10. Le coude 20 sera désigné ci-après coude intermédiaire et le coude supérieur 22 sera désigné par coude froid, ce coude débouchant sur le tube supérieur 24 qui constitue le tube froid du système de tubes radiants 10.According to the invention, the burner 14 is positioned on the lower branch of the system of radiant tubes, that is to say at the end of the lower tube 16 which constitutes the hot tube. The elbow 18 which extends the hot tube 16 constitutes the hot elbow of the system 10. The elbow 20 will be designated hereinafter intermediate elbow and the upper elbow 22 will be designated by cold elbow, this elbow opening onto the upper tube 24 which constitutes the tube cold radiant tube system 10.

A la partie supérieure du système 10 le coude froid est pourvu d'un dispositif de support dont la fonction se résume à un appui simple. Dans cet exemple de réalisation cet appui simple est réalisé sous la forme d'une console 28 sur laquelle peut venir reposer une plaque d'appui 26 rendue solidaire par tout moyen approprié du coude froid 22. Lors de la mise en chauffe du système de tubes radiants 10, par mise en service du brûleur 14, le tube froid 24 ainsi que le coude 22 se soulèvent et l'appui constitué par la plaque et la console 28 ne joue plus aucun rôle dans la répartition des contraintes dans le système de tubes 10. La conception de cet appui selon la présente invention ne doit donc pas engendrer de limitation dans les dilatations verticales et horizontales.At the upper part of the system 10 the cold elbow is provided with a support device the function of which boils down to a simple press. In this embodiment, this simple support is produced in the form of a console 28 on which a support plate 26 can come to rest, made integral by any appropriate means with the cold elbow 22. When the tube system is heating up radiant heaters 10, by commissioning the burner 14, the cold tube 24 and the elbow 22 are raised and the support formed by the plate and the console 28 no longer plays any role in the distribution of stresses in the tube system 10 The design of this support according to the present invention should therefore not cause any limitation in the vertical and horizontal expansions.

On comprend que le coude associé au support est le coude froid 22 dans lequel les contraintes les plus importantes sont acceptables. Sur la figure 3 on a représenté la variation de la température du système de tubes 10 en fonction de sa longueur et on a porté en abscisse la position des coudes respectifs 18, 20, 22. Sur la figure 4 on a représenté la variation de la contrainte de fluage admissible en fonction de la température du système de tubes 10. Cette courbe montre bien que les contraintes admissibles dans la région du coude froid sont beaucoup plus élevées que celles acceptables dans la coude chaud. Une telle disposition est primordiale pour l'optimisation du réseau de contraintes.It is understood that the elbow associated with the support is the cold elbow 22 in which the most important stresses are acceptable. In FIG. 3, the variation in the temperature of the tube system 10 is shown as a function of its length, and the position of the respective elbows 18, 20, 22 is plotted on the abscissa. In FIG. 4, the variation in the admissible creep stress as a function of the temperature of the tube system 10. This curve shows although the allowable stresses in the cold elbow region are much higher than those acceptable in the hot elbow. Such an arrangement is essential for optimizing the constraint network.

Selon l'invention on prévoit un système de liaison entre le coude chaud 18 et le coude froid 22, ce système de liaison étant caractérisé essentiellement par le fait qu'il ne comporte aucune pièce intermédiaire (biellette). Comme on le voit sur les figures 1, 5 et 6 le coude 18 est pourvu d'une équerre 32 venue directement de fonderie avec ce coude chaud 18 et de même le coude froid 22 est muni d'une équerre similaire 30 venue également directement de fonderie avec ce coude froid 22. Ainsi les équerres 30 et 32 sont obtenues directement lors de la coulée des coudes dont elles font respectivement partie. En aucun cas ces équerres ne doivent être rapportées par soudure sur les coudes étant donné que de telles soudures génèrent des concentrations de contraintes et des risques de microfissuration aux emplacements où les contraintes sont maximales lors du fonctionnement. Comme on le voit sur les figures 5 et 6 les équerres 30 et 32 sont reliées par l'intermédiaire d'une pièce de liaison pouvant être réalisée sous la forme d'une clavette telle que 34, la conception étant telle que les jeux permettent des mouvements relatifs des coudes chaud 18 et froid 22 lors de mises en température, lors du fonctionnement du four en marche stabilisée et lors des transitoires (variation de puissance du système de tubes radiants 10).According to the invention there is provided a connection system between the hot elbow 18 and the cold elbow 22, this connection system being characterized essentially by the fact that it does not comprise any intermediate part (link). As can be seen in FIGS. 1, 5 and 6, the elbow 18 is provided with a square 32 coming directly from the foundry with this hot elbow 18 and likewise the cold elbow 22 is provided with a similar square 30 also come directly from foundry with this cold elbow 22. Thus the brackets 30 and 32 are obtained directly during the casting of the elbows of which they are respectively part. In no case should these brackets be added by welding to the elbows since such welds generate stress concentrations and risks of microcracking at locations where the stresses are maximum during operation. As can be seen in FIGS. 5 and 6, the brackets 30 and 32 are connected by means of a connecting piece which can be produced in the form of a key such as 34, the design being such that the games allow relative movements of the hot 18 and cold 22 elbows when warming up, during operation of the oven in stabilized operation and during transients (power variation of the system of radiant tubes 10).

Ainsi le dispositif selon la présente invention n'engendre aucune contrainte supplémentaire.Thus the device according to the present invention does not generate any additional constraint.

Le système de tubes radiants perfectionné selon la présente invention comporte également une liaison entre le coude intermédiaire 20 et le tube inférieur chaud 16, côte brûleur 14. Un tel système visible sur la figure 1 et représenté plus en détail sur les figures 7 et 8 est essentiel pour optimiser la répartition des contraintes du système 10.The improved radiant tube system according to the present invention also comprises a connection between the intermediate elbow 20 and the hot lower tube 16, burner side 14. Such a system visible in FIG. 1 and shown in more detail in FIGS. 7 and 8 is essential for optimizing the distribution of system constraints 10.

Ainsi qu'on le voit sur le dessin ce système de liaison comporte une pièce 36 en forme de patte, venue directement de fonderie avec le coude intermédiaire 20 (toute soudure entre le coude 20 et une pièce de liaison telle que 36 étant prohibée pour les raisons indiquées ci-­dessus à propos des équerres 30 et 32) et une pièce 38 en forme d'étrier qui peut être montée sur la patte 36 par soudage étant donné que cette patte ne supporte aucune contrainte.As can be seen in the drawing, this connection system comprises a piece 36 in the shape of a tab, coming directly from the foundry with the intermediate elbow 20 (any welding between the elbow 20 and a connection piece such as 36 being prohibited for reasons indicated above with respect to the brackets 30 and 32) and a piece 38 in the shape of a stirrup which can be mounted on the lug 36 by welding since this lug does not support any stress.

La solidarisation par soudage entre la platte 36 et la pièce 38 en forme d'étrier est réalisée après contrôle du jeu intercalaire "j" entre l'étrier 38 et le tube inférieur chaud 16. La répartition ultérieure des contriantes du système de tubes radiants 10 dépend de la valeur de ce jeu intercalaire. En effet, lors de la mise en température du four, le coude intermédiaire 20 se rapproche du tube inférieur 16 à concurrence du jeu intercalaire "j" réalisé à froid et son déplacement s'en trouve ainsi limité. Cette situation correspond à une cartographie de la répartition des contraintes particulières pour chaque jeu intercalaire.The connection by welding between the plate 36 and the part 38 in the shape of a stirrup is carried out after checking the intermediate clearance "j" between the stirrup 38 and the hot lower tube 16. The subsequent distribution of the components of the system of radiant tubes 10 depends on the value of this infill. In fact, when the oven is warming up, the intermediate elbow 20 approaches the lower tube 16 up to the intermediate clearance "j" produced when cold and its movement is thus limited. This situation corresponds to a mapping of the distribution of the particular constraints for each infill set.

On remarquera qu'il n'existe aucune liaison par soudure entre la pièce 38 en forme d'étrier et le tube inférieur chaud 16, ce qui est primordial étant donné que ce tube inférieur chaud 16 est soumis à des variations de température importantes lors du fonctionnement du brûleur 14. La reprise de l'effort engendré par le coude intermédiaire 20 (limitation du déplacement) est assurée par le tube inférieur chaud 16 dans la partie où il est le plus froid c'est-à-dire dans la partie où il résiste le mieux (côté brûleur).It will be noted that there is no welded connection between the stirrup-shaped part 38 and the hot lower tube 16, which is essential given that this hot lower tube 16 is subjected to significant temperature variations during the operation of the burner 14. The recovery of the force generated by the intermediate bend 20 (limitation of movement) is ensured by the hot lower tube 16 in the part where it is the coldest, that is to say in the part where it resists the best (burner side).

Selon la présente invention la liaison des tubes inférieur 16 et supérieur 24 avec la tôlerie du four peut être réalisée par tout moyen approprié et notamment par toute technique conventionnelle. On notera toutefois que l'utilisation de soufflets de dilatation sur l'une des branches du système de tubes radiants 10, comme cela est prévu dans certaines réalisations classiques, amène ici plus d'inconvénients que d'avantages et dans ces conditions l'invention prévoit de réaliser la liaison entre les tubes inférieur et supérieur et la tôlerie du four sans utiliser de soufflets de dilatation.According to the present invention, the connection of the lower 16 and upper 24 tubes with the sheet metal of the furnace can be carried out by any suitable means and in particular by any conventional technique. Note however that the use of expansion bellows on one of the branches of the system of radiant tubes 10, as is provided in certain conventional embodiments, brings here more drawbacks than advantages and under these conditions the invention plans to carry out the connection between the lower and upper tubes and the sheet metal of the furnace without using expansion bellows.

Il demeure bien entendu que la présente invention n'est pas limitée à l'exemple de réalisation décrit et représenté ici mais qu'elle en englobe toutes les variantes.It remains to be understood that the present invention is not limited to the embodiment described and shown here but that it encompasses all variants thereof.

Claims (5)

1. Système de tubes radiants du type à double épingle ou en W utilisé dans des fours de chauffage, notamment dans des fours de chauffage de bandes métalliques au défilé, pour réaliser le transfert thermique entre les gaz de combustion émis par un brûleur et les produits à chauffer caractérisé en ce que :
- le brûleur (14) est positionné dans la branche inférieure (16) desdits tubes (10) ;
- le dispositif de support de coude froid (22), en partie supérieure des tubes est réalisé sous la forme d'un appui simple (26,28) ;
- le coude froid (22) et le coude chaud (18)sont reliés l'un à l'autre sans pièce intermédiaire soudé et,
- le coude intermédiaire (20) et le tune inférieur (16) sont reliés l'un à l'autre avec un jeu réglable entre ces deux éléments.1. A system of radiant tubes of the double pin or W type used in heating ovens, in particular in furnaces for heating metal strips in the process, for carrying out the heat transfer between the combustion gases emitted by a burner and the products to be heated, characterized in that:
- The burner (14) is positioned in the lower branch (16) of said tubes (10);
- The cold elbow support device (22), in the upper part of the tubes is produced in the form of a simple support (26,28);
the cold elbow (22) and the hot elbow (18) are connected to each other without a welded intermediate piece and,
- The intermediate bend (20) and the lower tune (16) are connected to each other with an adjustable clearance between these two elements. 2. Système de tubes radiants selon la revendication 1 caractérisé en ce que l'appui simple qui supportant le coude froid (22) est réalisé sous la forme d'une console (28) sur laquelle vient reposer le coude froid, avant mise en chauffe du tube radiant (10), le coude froid se soulevant pour quitter cet appui dès la mise en chauffe.2. System of radiant tubes according to claim 1 characterized in that the simple support which supports the cold elbow (22) is produced in the form of a console (28) on which rests the cold elbow, before heating of the radiant tube (10), the cold elbow rising to leave this support upon heating. 3. Système de tubes radiants selon l'une des revendications 1 ou 2 caractérisé en ce que le coude froid (22) et le coude chaud (18) sont reliés par l'intermédiaire d'équerres (30, 32), venues respectivement de fonderie avec son coude respectif, ces équerres étant reliées entre elles à l'aide d'une clavette (34).3. radiant tube system according to one of claims 1 or 2 characterized in that the cold elbow (22) and the hot elbow (18) are connected by means of brackets (30, 32), respectively coming from foundry with its respective elbow, these brackets being interconnected using a key (34). 4. Système de tubes radiants selon l'une quelconque des revendications précédentes caractérisé en ce que le moyen de liaison entre le coude intermédiaire (20) et le tube inférieur (16) côté brûleur, est réalisé à l'aide d'une patte (36), venue de fonderie avec ledit coude intermédiaire, sur laquelle est soudée une pièce en forme d'étrier (38) pouvant venir s'appuyer sur ledit tube inférieur, un jeu intercalaire "j" étant prévu entre ledit étrier et le tube inférieur, la répartition des contraintes du tube radiant (10) étant fonction de la valeur de ce jeu, et la reprise de l'effort engendré par le coude intermédiaire étant assurée par le tube inférieur dans la partie où celui-ci est le plus froid.4. System of radiant tubes according to any one of the preceding claims, characterized in that the connection means between the intermediate elbow (20) and the lower tube (16) on the burner side, is produced using a tab ( 36), coming from the foundry with said intermediate bend, on which is welded a stirrup-shaped part (38) which can come to bear on said lower tube, an intermediate play "j" being provided between said stirrup and the lower tube , the distribution of the stresses of the radiant tube (10) being a function of the value of this play, and the resumption of the force generated by the intermediate bend being ensured by the lower tube in the part where it is the coldest. 5. Système de tubes radiants selon l'une quelconque des revendications précédentes caractérisé en ce que la liaison de tubes inférieur (16) et supérieur (24) avec la tôlerie du four est réalisée par des moyens classiques, sans soufflet de dilatation.5. Radiant tube system according to any one of the preceding claims, characterized in that the connection of the lower (16) and upper (24) tubes with the sheet metal of the furnace is carried out by conventional means, without expansion bellows.
EP90400409A 1989-02-17 1990-02-14 Radiant tube system for heating furnaces Expired - Lifetime EP0383687B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8902117 1989-02-17
FR8902117A FR2643447B1 (en) 1989-02-17 1989-02-17 RADIANT TUBE SYSTEM FOR HEATING OVENS

Publications (2)

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EP0383687A1 true EP0383687A1 (en) 1990-08-22
EP0383687B1 EP0383687B1 (en) 1994-06-08

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EP90400409A Expired - Lifetime EP0383687B1 (en) 1989-02-17 1990-02-14 Radiant tube system for heating furnaces

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US (1) US5042452A (en)
EP (1) EP0383687B1 (en)
JP (1) JPH0674881B2 (en)
AT (1) ATE107015T1 (en)
DE (2) DE69009519T2 (en)
ES (1) ES2017061T3 (en)
FR (1) FR2643447B1 (en)
GR (1) GR900300158T1 (en)
NO (1) NO177105C (en)
RU (1) RU1773299C (en)

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WO2011044596A1 (en) * 2009-10-13 2011-04-21 Ebner Industrieofenbau Gesellschaft M.B.H. Device for heat-treating sheet metal strips
US8877120B2 (en) 2009-10-13 2014-11-04 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips

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FR2685437B1 (en) * 1991-12-23 1994-01-28 Stein Industrie DEVICE FOR SUPPORTING A FIXED FRAMEWORK OF A MASS CONNECTED OVERTIGHT TO A MOBILE ELEMENT.
US5362230A (en) * 1993-03-24 1994-11-08 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
US5370530A (en) * 1993-03-24 1994-12-06 Italimpianti Of America, Inc. Rolls for high temperature roller hearth furnaces
JP3855369B2 (en) * 1997-05-26 2006-12-06 Ｊｆｅスチール株式会社 Radiant tube support device
US7487745B2 (en) * 2005-04-28 2009-02-10 Mark Rettig Boiler tube position retainer assembly
US7559294B2 (en) * 2007-04-26 2009-07-14 Babcock & Wilcox Power Generation Group Inc. End support configuration for steam tubes of a superheater or reheater
DE202008009065U1 (en) * 2008-07-04 2008-10-09 WS Wärmeprozesstechnik GmbH Radiant heating arrangement with delay compensation
JP6028595B2 (en) * 2013-01-29 2016-11-16 新日鐵住金株式会社 Heating furnace using radiant tubes
DK3311073T3 (en) * 2016-09-07 2020-07-20 Doosan Lentjes Gmbh CIRCULATING FLUIDIZED RENTAL APPLIANCE
CN110748885A (en) * 2019-11-18 2020-02-04 江苏优泽科技有限公司 Radiant tube

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WO2011044596A1 (en) * 2009-10-13 2011-04-21 Ebner Industrieofenbau Gesellschaft M.B.H. Device for heat-treating sheet metal strips
CN102597621A (en) * 2009-10-13 2012-07-18 艾伯纳工业筑炉有限公司 Device for heat-treating sheet metal strips
RU2506496C2 (en) * 2009-10-13 2014-02-10 Эбнер Индустриофенбау Гезелльшафт М.Б.Х. Heat treatment device for coiled strips
US8877120B2 (en) 2009-10-13 2014-11-04 Ebner Industrieofenbau Gmbh Device for heat-treating sheet metal strips

Also Published As

Publication number Publication date
NO177105B (en) 1995-04-10
US5042452A (en) 1991-08-27
DE383687T1 (en) 1991-01-17
FR2643447B1 (en) 1991-10-04
NO177105C (en) 1995-07-19
NO900763L (en) 1990-08-20
ATE107015T1 (en) 1994-06-15
DE69009519T2 (en) 1994-09-29
GR900300158T1 (en) 1991-09-27
JPH0674881B2 (en) 1994-09-21
DE69009519D1 (en) 1994-07-14
JPH02254208A (en) 1990-10-15
ES2017061A4 (en) 1991-01-01
FR2643447A1 (en) 1990-08-24
ES2017061T3 (en) 1994-08-16
RU1773299C (en) 1992-10-30
NO900763D0 (en) 1990-02-16
EP0383687B1 (en) 1994-06-08

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