EP0459864A1 - Furnace for reheating metallurgical products - Google Patents

Furnace for reheating metallurgical products Download PDF

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Publication number
EP0459864A1
EP0459864A1 EP91401305A EP91401305A EP0459864A1 EP 0459864 A1 EP0459864 A1 EP 0459864A1 EP 91401305 A EP91401305 A EP 91401305A EP 91401305 A EP91401305 A EP 91401305A EP 0459864 A1 EP0459864 A1 EP 0459864A1
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EP
European Patent Office
Prior art keywords
oven
products
wall
axis
walls
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.)
Withdrawn
Application number
EP91401305A
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German (de)
French (fr)
Inventor
Pierre-Jacques Lhomme
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 EP0459864A1 publication Critical patent/EP0459864A1/en
Withdrawn legal-status Critical Current

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    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/26—Arrangements of heat-exchange apparatus
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/06—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces with movable working chambers or hearths, e.g. tiltable, oscillating or describing a composed movement
    • F27B3/065—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces with movable working chambers or hearths, e.g. tiltable, oscillating or describing a composed movement tiltable
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0085—Movement of the container or support of the charge in the furnace or in the charging facilities
    • F27D2003/0089—Rotation about a horizontal or slightly inclined axis
    • F27D2003/009—Oscillations about a horizontal axis; Rocking

Definitions

  • the present invention relates to an oven intended in particular for heating mineral products, in particular metallurgical products, preferably in bulk and more particularly for heating waste from metallurgical or iron and steel installations.
  • rotary kilns In factories specializing in the recovery of metallic waste, such as aluminum turnings in particular, rotary kilns are used.
  • the rotary ovens currently produced are rotatably mounted on rollers and they are heated using a burner whose flame develops along the axis of the oven.
  • These known ovens are made in such a way that the flame heats the roof and, due to the rotary movement of the oven, this roof is found some time later under the products introduced in bulk into the oven enclosure and which are thus heated to their tower.
  • the invention relates to an oven intended for reheating metallurgical products and more particularly loose metal waste which is mounted on rollers and in which the products are reheated by heat exchange with one of the walls of the oven previously subjected to the effect of a means of heating, this oven being characterized in that it is driven in a rotational movement, along its axis, preferably in a reciprocating movement and in that it comprises a burner system which is designed so as to heat alternately one wall of the oven then the opposite wall, so that one of said walls is in the heating phase while the other wall transmits the heat which it has previously stored, during its heating phase, to the products to be heated.
  • the burner system comprises two burners arranged symmetrically on either side of the axis of rotation of the oven and on the roof of the latter, the axis of each of said burners being positioned so that each burner heats one of the walls of the oven.
  • this movement is obtained using at least one double-acting cylinder which acts on a workpiece square shaped placed on the outside wall of the oven in its upper part.
  • the burner system comprises regenerative burners.
  • the oven containing products P to be heated these being preferably arranged in bulk in the oven enclosure. It may especially be mineral products, in particular metallurgical products and more particularly metallic waste.
  • this example of application has no limiting character.
  • the entire oven 10 is mounted on a roller system such as 12 so that the oven can undergo a rotational movement along its axis X-X ′.
  • this movement is a reciprocating movement which, in this exemplary embodiment which has no limiting character, is obtained using at least one double-acting cylinder such as 14 whose the rod is articulated on a square-shaped part 16 welded to the upper part of the external wall of the oven as can be seen in FIGS. 2 and 3.
  • the rotary movement of the oven can be continuous type.
  • the heating means of the oven consist of two burners 18, 18 ′ which are placed on the roof of the oven and positioned symmetrically with respect to the longitudinal plane of symmetry of the oven and whose orientation is chosen so that the flame developed by these burners heats the wall of the oven facing it. It can be seen in FIG. 2 that the burner 18 heats the wall 20 of the oven and that the burner 18 ′ heats the opposite wall 22.
  • the sectional profile of the oven object of the present invention shows the presence of a surface of conduction with the products to be heated and of radiation and convection with the fumes, greater than that of a rotary kiln according to the prior art, of the cylindrical type.
  • the oven according to the invention is in alternating rotation, which constitutes a very important difference compared to rotary ovens according to the prior art in which the rotation is of the continuous type.
  • This design allows in particular the use of burners 18, 18 'which, are no longer arranged along the axis of the oven as seen above, which allows the use of regenerative burners.
  • this solution makes it possible to obtain larger exchange surfaces between the products to be reheated and the walls of the oven previously heated by the burner system, these walls with a high heat storage capacity.
  • the present invention is not limited to the embodiments described and / or shown here but that it encompasses all variants thereof.
  • the oven has in cross section the shape of a triangle, and preferably an equilateral triangle, one can consider any other shape compatible with the effects sought by the invention.
  • the triangular shape given to the oven which is the subject of the present invention lends itself remarkably well to the use of regenerative burners.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

Furnace intended for reheating metallurgical products, in particular in bulk, and more specifically metal waste, which is mounted on rollers and in which the products are reheated by heat exchange with one of the walls of the furnace which has previously been subjected to the action of a heating means, this rotary furnace being characterised in that it is driven with a rotation movement, in particular with an alternating rotation movement according to its axis and in that it comprises a system of burners (18, 18') which is designed so as to heat alternately one wall (20) of the furnace and then the opposite wall (22), in order that one of said walls is in heating phase while the other wall transmits the heat which it has previously stored, during its heating phase, to the products to be reheated (P). <IMAGE>

Description

La présente invention concerne un four destiné notamment au chauffage de produits minéraux, notamment métallurgiques, de préférence en vrac et plus particulièrement au chaffage de déchets provenant d'installations métallurgiques ou sidérurgiques.The present invention relates to an oven intended in particular for heating mineral products, in particular metallurgical products, preferably in bulk and more particularly for heating waste from metallurgical or iron and steel installations.

Dans les usines spécialisées dans la récupération de déchets métalliques, tels que notamment des tournures d'aluminium, on utilise des fours tournants. Les fours tournants actuellement réalisés sont montés à rotation sur des galets et ils sont chauffés à l'aide d'un brûleur dont la flamme se développe suivant l'axe du four. Ces fours connus sont réalisés de manière que la flamme chauffe la voûte et, en raison du mouvement de rotation du four, cette voûte se retrouve quelques temps après sous les produits introduits en vrac dans l'enceinte du four et qui sont ainsi chauffés à leur tour.In factories specializing in the recovery of metallic waste, such as aluminum turnings in particular, rotary kilns are used. The rotary ovens currently produced are rotatably mounted on rollers and they are heated using a burner whose flame develops along the axis of the oven. These known ovens are made in such a way that the flame heats the roof and, due to the rotary movement of the oven, this roof is found some time later under the products introduced in bulk into the oven enclosure and which are thus heated to their tower.

Ces fours connus nécessitent des systèmes mécaniques de rotation relativement compliqués et coûteux à réaliser et, en outre, la surface de contact qui est offerte pour l'échange thermique entre la paroi du four et les produits à chauffer est trop limitée. La présente invention se propose d'améliorer les fours prévus pour de telles applications.These known ovens require relatively complicated and expensive mechanical systems of rotation to produce and, in addition, the contact surface which is offered for the heat exchange between the wall of the oven and the products to be heated is too limited. The present invention proposes to improve the ovens provided for such applications.

En conséquence, l'invention concerne un four destiné au réchauffage de produits métallurgiques et plus particulièrement de déchets métalliques en vrac qui est monté sur des galets et dans lequel les produits sont réchauffés par échange thermique avec l'une des parois du four préalablement soumise à l'effet d'un moyen de chauffage, ce four étant caractérisé en ce qu'il est animé d'un mouvement de rotation, selon son axe, de préférence d'un mouvement alternatif et en ce qu'il comporte un système de brûleurs qui est conçu de façon à chauffer alternativement une paroi du four puis la paroi opposée, afin que l'une desdites parois soit en phase de chauffage alors que l'autre paroi transmet la chaleur qu'elle a précédemment emmagasinée, lors de sa phase de chauffage, aux produits à réchauffer.Consequently, the invention relates to an oven intended for reheating metallurgical products and more particularly loose metal waste which is mounted on rollers and in which the products are reheated by heat exchange with one of the walls of the oven previously subjected to the effect of a means of heating, this oven being characterized in that it is driven in a rotational movement, along its axis, preferably in a reciprocating movement and in that it comprises a burner system which is designed so as to heat alternately one wall of the oven then the opposite wall, so that one of said walls is in the heating phase while the other wall transmits the heat which it has previously stored, during its heating phase, to the products to be heated.

Selon un exemple de réalisation du four objet de la présente invention, le système de brûleurs comporte deux brûleurs disposés symétriquement de part et d'autre de l'axe de rotation du four et sur la voûte de ce dernier, l'axe de chacun desdits brûleurs étant positionné de manière que chaque brûleur chauffe l'une des parois du four.According to an exemplary embodiment of the oven object of the present invention, the burner system comprises two burners arranged symmetrically on either side of the axis of rotation of the oven and on the roof of the latter, the axis of each of said burners being positioned so that each burner heats one of the walls of the oven.

Selon le mode de réalisation préféré du four selon l'invention, dans lequel le mouvement du four autour de son axe est du type alternatif, ce mouvement est obtenu à l'aide d'au moins un vérin à double effet qui agit sur une pièce en forme d'équerre placée sur la paroi extérieure du four dans sa partie supérieure.According to the preferred embodiment of the oven according to the invention, in which the movement of the oven around its axis is of the alternative type, this movement is obtained using at least one double-acting cylinder which acts on a workpiece square shaped placed on the outside wall of the oven in its upper part.

Selon un exemple de réalisation préféré du four tournant objet de l'invention, le système de brûleurs comporte des brûleurs régénératifs.According to a preferred embodiment of the rotary kiln which is the subject of the invention, the burner system comprises regenerative burners.

D'autres caractéristiques et avantages de la présente invention ressortiront de la présente invention faite ci-après en référence au dessin qui en illustre un exemple de réalisation dépourvu de tout caractère limitatif. Sur le dessin :

  • la figure 1 est une vue schématique en coupe axiale longitudinale d'un mode de réalisation préféré du four selon l'invention ;
  • la figure 2 est une coupe selon 2-2 de la figure 1 et ;
  • la figure 3 est une coupe similaire à la figure 2, le four étant représenté en position inclinée, le produit à réchauffer étant au contact de la paroi préalablement soumise à l'effet du système de chauffage.
Other characteristics and advantages of the present invention will emerge from the present invention made below with reference to the drawing which illustrates an embodiment thereof devoid of any limiting character. On the drawing :
  • Figure 1 is a schematic view in longitudinal axial section of a preferred embodiment of the oven according to the invention;
  • Figure 2 is a section on 2-2 of Figure 1 and;
  • Figure 3 is a section similar to Figure 2, the oven being shown in an inclined position, the product to be heated being in contact with the wall previously subjected to the effect of the heating system.

En se référant au dessin, on y a désigné par la référence 10 le four contenant des produits P à réchauffer, ceux-ci étant disposés de préférence en vrac dans l'enceinte du four. Il peut s'agir notamment de produits minéraux, notamment métallurgiques et plus particulièrement de déchets métalliques. Toutefois, cet exemple d'application ne comporte aucun caractère limitatif. L'ensemble du four 10 est monté sur un système de galets tel que 12 de manière que le four puisse subir un mouvement de rotation selon son axe X-X′. Selon le mode de réalisation préféré de l'invention, ce mouvement est un mouvement alternatif qui, dans cet exemple de réalisation qui ne présente aucun caractère limitatif, est obtenu à l'aide d'au moins un vérin à double effet tel que 14 dont la tige est articulée sur une pièce en forme d'équerre 16 soudée à la partie supérieure de la paroi extérieure du four ainsi qu'on peut le voir sur les figures 2 et 3. Bien entendu, le mouvement de rotation du four peut être du type continu.Referring to the drawing, there has been designated by the reference 10 the oven containing products P to be heated, these being preferably arranged in bulk in the oven enclosure. It may especially be mineral products, in particular metallurgical products and more particularly metallic waste. However, this example of application has no limiting character. The entire oven 10 is mounted on a roller system such as 12 so that the oven can undergo a rotational movement along its axis X-X ′. According to the preferred embodiment of the invention, this movement is a reciprocating movement which, in this exemplary embodiment which has no limiting character, is obtained using at least one double-acting cylinder such as 14 whose the rod is articulated on a square-shaped part 16 welded to the upper part of the external wall of the oven as can be seen in FIGS. 2 and 3. Of course, the rotary movement of the oven can be continuous type.

Les moyens de chauffage du four sont constitués de deux brûleurs 18, 18′ qui sont placés sur la voûte du four et positionnés symétriquement par rapport au plan de symétrie longitudinal du four et dont l'orientation est choisie de manière que la flamme développée par ces brûleurs chauffe la paroi du four qui lui fait face. On voit sur la figure 2 que le brûleur 18 assure le chauffage de la paroi 20 du four et que le brûleur 18′ chauffe la paroi opposée 22. Le profil en coupe du four objet de la présente invention montre la présence d'une surface de conduction avec les produits à réchauffer et de rayonnement et convection avec les fumées, plus importante que celle d'un four tournant selon la technique antérieure, de type cylindrique.The heating means of the oven consist of two burners 18, 18 ′ which are placed on the roof of the oven and positioned symmetrically with respect to the longitudinal plane of symmetry of the oven and whose orientation is chosen so that the flame developed by these burners heats the wall of the oven facing it. It can be seen in FIG. 2 that the burner 18 heats the wall 20 of the oven and that the burner 18 ′ heats the opposite wall 22. The sectional profile of the oven object of the present invention shows the presence of a surface of conduction with the products to be heated and of radiation and convection with the fumes, greater than that of a rotary kiln according to the prior art, of the cylindrical type.

On comprend que dans le système objet de la présente invention on réalise un four à mouvement alternatif permettant d'obtenir une surface de contact très importante pour assurer un échange thermique entre l'une des parois 20 ou 22 du four et les produits en vrac P à réchauffer. Par conséquent, grâce au mouvement alternatif du four suivant son axe X-X′, obtenu par le vérin 14, l'une des parois est en phase de chauffage alors que la paroi opposée transmet la chaleur aux produits, cette chaleur ayant été préalablement emmagasinée lors de la phase chauffage de cette paroi. Sur la figure 3, le four selon l'invention a été représenté dans la position dans laquelle la paroi 20 est en phase chauffage sous l'action du brûleur 18 et les produits P au contact de la paroi 22 préalablement chauffée par le brûleur 18′ sont en cours de réchauffage par échange thermique avec cette paroi 22.It will be understood that in the system which is the subject of the present invention, an oven with reciprocating motion is produced, making it possible to obtain a very large contact surface to ensure heat exchange between one of the walls 20 or 22 of the oven and the bulk products P to reheat. Consequently, thanks to the reciprocating movement of the furnace along its axis XX ′, obtained by the jack 14, one of the walls is in the heating phase while the opposite wall transmits heat to the products, this heat having been previously stored during the heating phase of this wall. In FIG. 3, the oven according to the invention has been shown in the position in which the wall 20 is in the heating phase under the action of the burner 18 and the products P in contact with the wall 22 previously heated by the burner 18 ′ are being reheated by heat exchange with this wall 22.

Ainsi, le four selon l'invention est en rotation alternée, ce qui constitue une différence très importante par rapport aux fours tournants selon la technique antérieure dans lesquels la rotation est de type continu. Cette conception permet notamment l'utilisation de brûleurs 18, 18′ qui, ne sont plus disposés suivant l'axe du four ainsi qu'on l'a vu ci-dessus, ce qui autorise une utilisation de brûleurs régénératifs. Par ailleurs, cette solution permet d'obtenir des surfaces d'échange plus importantes entre les produits à réchauffer et les parois du four préalablement chauffées par le système de brûleurs, ces parois présentant une forte capacité de stockage calorifique.Thus, the oven according to the invention is in alternating rotation, which constitutes a very important difference compared to rotary ovens according to the prior art in which the rotation is of the continuous type. This design allows in particular the use of burners 18, 18 'which, are no longer arranged along the axis of the oven as seen above, which allows the use of regenerative burners. Furthermore, this solution makes it possible to obtain larger exchange surfaces between the products to be reheated and the walls of the oven previously heated by the burner system, these walls with a high heat storage capacity.

Il demeure bien entendu que la présente invention n'est pas limitée aux exemples de réalisation décrits et/ou représentés ici mais qu'elle en englobe toutes les variantes. C'est ainsi notamment que bien que dans l'exemple de réalisation préféré illustré par les dessins le four présente en coupe transversale la forme d'un triangle, et de préférence d'un triangle équilatéral, on peut envisager toute autre forme compatible avec les effets recherchés par l'invention. Toutefois, on notera que la forme triangulaire donnée au four objet de la présente invention se prête remarquablement bien à l'utilisation de brûleurs régénératifs.It remains to be understood that the present invention is not limited to the embodiments described and / or shown here but that it encompasses all variants thereof. Thus in particular that although in the preferred embodiment illustrated by the drawings the oven has in cross section the shape of a triangle, and preferably an equilateral triangle, one can consider any other shape compatible with the effects sought by the invention. However, it will be noted that the triangular shape given to the oven which is the subject of the present invention lends itself remarkably well to the use of regenerative burners.

Claims (5)

Four destiné au réchauffage de produits minéraux et métallurgiques, notamment en vrac, et plus particulièrement de déchets métalliques, qui est monté sur des galets et dans lequel les produits sont réchauffés par échange thermique avec l'une des parois du four préalablement soumise à l'effet d'un moyen de chauffage, ce four tournant étant caractérisé en ce qu'il est animé d'un mouvement de rotation, notamment d'un mouvement de rotation alternatif selon son axe (X-X′) et en ce qu'il comporte un système de brûleurs (18, 18′) qui est conçu de façon à chauffer alternativement une paroi (20) du four puis la paroi opposée (22), afin que l'une desdites parois soit en phase de chauffage alors que l'autre paroi transmet la chaleur qu'elle a précédemment emmagasinée, lors de sa phase chauffage, aux produits à réchauffer (P).Oven intended for reheating mineral and metallurgical products, in particular in bulk, and more particularly of metallic waste, which is mounted on rollers and in which the products are reheated by heat exchange with one of the walls of the oven previously subjected to effect of a heating means, this rotary kiln being characterized in that it is driven by a rotational movement, in particular by an alternating rotational movement along its axis (XX ′) and in that it comprises a burner system (18, 18 ′) which is designed so as to alternately heat a wall (20) of the oven and then the opposite wall (22), so that one of said walls is in the heating phase while the other wall transmits the heat it previously stored, during its heating phase, to the products to be heated (P). Four selon la revendication 1, caractérisé en ce que ledit système de brûleurs comporte deux brûleurs ( 18, 18′) disposés symétriquement de part et d'autre de l'axe de rotation du four et sur la voûte de ce dernier, l'axe de chacun desdits brûleurs étant positionné de manière que chaque brûleur chauffe l'une des parois du four (20 ou 22 ).Oven according to claim 1, characterized in that said burner system comprises two burners (18, 18 ′) arranged symmetrically on either side of the axis of rotation of the oven and on the roof of the latter, the axis of each of said burners being positioned so that each burner heats one of the walls of the oven (20 or 22). Four selon l'une des revendications 1 ou 2, caractérisé en ce que le mouvement alternatif du four autour de son axe est obtenu à l'aide d'au moins un vérin (14) à double effet qui agit sur une pièce en forme d'équerre (16) placée sur la paroi extérieure du four dans sa partie supérieure.Oven according to one of claims 1 or 2, characterized in that the reciprocating movement of the oven around its axis is obtained using at least one double-acting cylinder (14) which acts on a d-shaped part 'square (16) placed on the outer wall of the oven in its upper part. Four selon l'une quelconque des revendications précédentes, caractérisé en ce que le système de brûleurs (18, 18′) comporte des brûleurs régénératifs.Oven according to any one of the preceding claims, characterized in that the burner system (18, 18 ′) comprises regenerative burners. Four selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il présente en coupe transversale une forme triangulaire et notamment la forme d'un triangle équilatéral.Oven according to any one of the preceding claims, characterized in that it has a triangular shape in cross section and in particular the shape of an equilateral triangle.
EP91401305A 1990-05-29 1991-05-21 Furnace for reheating metallurgical products Withdrawn EP0459864A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9008257 1990-05-29
FR9008257A FR2663950B1 (en) 1990-06-29 1990-06-29 OVEN FOR HEATING METALLURGICAL PRODUCTS.

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EP0459864A1 true EP0459864A1 (en) 1991-12-04

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EP91401305A Withdrawn EP0459864A1 (en) 1990-05-29 1991-05-21 Furnace for reheating metallurgical products

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FR (1) FR2663950B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE645304C (en) * 1935-11-09 1937-05-25 Metallgesellschaft Akt Ges Pendulum furnace
US3377059A (en) * 1965-12-27 1968-04-09 Ankersen Borge Richard Rotary hearth metal melting furnaces
DE3200052A1 (en) * 1981-01-12 1982-08-12 Voest-Alpine AG, 4010 Linz Tippable metallurgical vessel
EP0368633A2 (en) * 1988-11-08 1990-05-16 British Gas plc Apparatus for and method of heating a vessel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE645304C (en) * 1935-11-09 1937-05-25 Metallgesellschaft Akt Ges Pendulum furnace
US3377059A (en) * 1965-12-27 1968-04-09 Ankersen Borge Richard Rotary hearth metal melting furnaces
DE3200052A1 (en) * 1981-01-12 1982-08-12 Voest-Alpine AG, 4010 Linz Tippable metallurgical vessel
EP0368633A2 (en) * 1988-11-08 1990-05-16 British Gas plc Apparatus for and method of heating a vessel

Also Published As

Publication number Publication date
FR2663950A1 (en) 1992-01-03
FR2663950B1 (en) 1993-05-28

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