EP0368829A2 - Solid-fuel burner - Google Patents

Solid-fuel burner Download PDF

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Publication number
EP0368829A2
EP0368829A2 EP89870159A EP89870159A EP0368829A2 EP 0368829 A2 EP0368829 A2 EP 0368829A2 EP 89870159 A EP89870159 A EP 89870159A EP 89870159 A EP89870159 A EP 89870159A EP 0368829 A2 EP0368829 A2 EP 0368829A2
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EP
European Patent Office
Prior art keywords
burner
solid fuel
end plate
peripheral conduits
peripheral
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
EP89870159A
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German (de)
French (fr)
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EP0368829B1 (en
EP0368829A3 (en
Inventor
Arthur Poos
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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Publication of EP0368829A2 publication Critical patent/EP0368829A2/en
Publication of EP0368829A3 publication Critical patent/EP0368829A3/en
Application granted granted Critical
Publication of EP0368829B1 publication Critical patent/EP0368829B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2214/00—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00006—Liquid fuel burners using pure oxygen or O2-enriched air as oxidant

Definitions

  • the present invention relates to a solid fuel burner, in particular a finely divided coal burner.
  • This type of burner can be used whenever there is a need for very intense combustion and a very short flame, in particular in the case of low oxygen / carbon ratios, and especially for the injection of pulverized coal in a blast furnace.
  • the burner includes means for injecting an oxidizing gas, such as air, oxygen, an air-oxygen mixture or an oxygen-water vapor mixture.
  • burners are already known based on the principle of post-mixing ", that is to say constructed in such a way that the fuel and the oxidizer exit separately from the burner and meet outside of it, at a certain distance from the outlet end of the burner. This arrangement avoids any risk of flashback.
  • These burners are, however, generally designed to use one or more liquid or gaseous fuels, which can be easily atomized and / or mixed with combustion air.
  • the present invention provides a burner of the so-called "post-mix” type, intended for the use of a solid fuel such as finely divided coal, which does not present a risk of clogging and which ensures very intense combustion of the solid fuel.
  • a solid fuel burner comprising a burner body, preferably cylindrical, closed by an end plate, as well as means serving on the one hand for solid fuel and on the other hand for a oxidizing gas and opening into said end plate, is characterized in that the means for supplying the solid fuel consist of a central duct, arranged along the longitudinal axis of said burner body, in that the means for supplying the oxidizing gas are constituted by a plurality of peripheral conduits arranged around said central conduit and in that the interior volume of said burner body, around said central conduit and said peripheral conduits, constitutes a cooling circuit of the burner.
  • the peripheral conduits are parallel to the central conduit and they are preferably distributed uniformly around the central conduit.
  • the central duct and / or the peripheral ducts can be constituted by tubes of constant section.
  • the finely divided fuel jet generally transported by a pressurized carrier gas, bursts at the outlet of the central duct and mixes with the oxidizing gas leaving the peripheral ducts.
  • the terminal part of at least one of the peripheral conduits is internally provided with a longitudinal profile in the shape of a Laval nozzle, that is to say comprising a convergent section, a neck and a divergent section succeeding one another in the direction of circulation of the oxidizing gas.
  • the dimensions of the Laval nozzle namely the diameter and the axial length of the neck, as well as the opening angles and the axial lengths of the converging and diverging sections, are determined, in a manner known per se, as a function of the flow rate and desired dynamic characteristics of the oxidizing gas jet to be produced.
  • the flame can arise at a point more or less distant from the outlet face of the burner, in particular as a function of the outlet speed of the oxidizing gas and of the solid fuel. These speeds also influence the length of the flame.
  • At least one of the peripheral conduits ends, at its mouth in the end plate of the burner body, by a channel inclined relative to the longitudinal axis of said conduit.
  • This inclination may be such that the axes of these end portions intersect the longitudinal axis of the burner, outside of the latter and forwardly relative to the end plate.
  • the axes of the terminal parts of all the peripheral conduits can have the same inclination; they all intersect at the same point and thus form a converging surface. According to this angle of inclination, the flame obtained will generally be rather long and confined.
  • the axes of said end parts can have any inclination, and even do not cut the longitudinal axis of the burner body. It is thus possible, in particular, to impart to the flame a rotational movement which can, if necessary, provide it with increased penetrating power.
  • a burner arrangement comprising a cylindrical burner body 1, at the end of which is fixed, for example by welding, an end plate or outlet plate 2.
  • a inside the burner body 1 are arranged on the one hand a central duct 3 and peripheral ducts 4 surrounding the central duct 3.
  • the central duct 3 is arranged along the longitudinal axis of the burner body 1; the peripheral conduits 4 are arranged around the central conduit 3 and parallel to the latter, they are for example 6 in number and angularly spaced by 60 °.
  • the conduits 3 and 4 are cylindrical and they open parallel to each other in the outlet plate 2.
  • the mouth itself of the central conduit 3 is situated slightly behind that of the peripheral conduits 4. It is located in a channel 5 formed in the outlet plate 2 and having internally a divergent longitudinal profile.
  • the internal volume 6 of the burner body 1 is traversed by a cooling agent.
  • the central duct 3 and the peripheral conduits are connected, at the rear of the burner, respectively to a source of solid fuel and to a source of oxidizing gas, not shown but symbolized by the arrows C and O2.
  • the divergent profile of the outlet channel 5 causes the solid fuel jet leaving the central duct 3 to burst and expand. This finely divided solid fuel then mixes with the oxidizing gas leaving the peripheral ducts 4 and combustion is thus initiated at a certain distance in front of the burner.
  • Figure 2 illustrates an arrangement for further improving the mixture of solid fuel and oxidizing gas.
  • the central duct 3 ends in an outlet channel 5 which has internally a divergent longitudinal profile.
  • peripheral conduits 4 or at least a part of them, have a terminal part 7 internally profiled in Laval nozzle.
  • the jets of oxidizing gas leaving the nozzles 7 are expanded and mix more intimately with the solid fuel, ensuring better combustion of the latter.
  • FIG. 3 represents a type of nozzle 8 usable with a burner according to the invention such as that of FIG. 2.
  • the nozzle 8 has a threaded surface 9 thanks to which it can be screwed into a corresponding threaded bore 10 formed at the end of a peripheral conduit 4 ( Figure 2).
  • This nozzle 8 has an axial passage 11 which comes place in the extension of the peripheral conduit 4 and which ends, on the outlet side, by an oblique channel 12.
  • This channel 12 can be oriented in a radial plane of the peripheral conduit 4, so as to form, with the channels 12 of the other peripheral conduits 4, a conical surface either convergent or divergent.
  • the channels 12 can also be oriented in such a way that their axes do not intersect the longitudinal axis of the body of the burner 1. In particular, they can form a left surface, such as a hyperboloid of revolution to impart the mixture and the flame which results in a rotational movement around its longitudinal axis.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Abstract

The burner comprises a body (1) which is closed by an end plate (2), and means which serve to deliver on the one hand a solid fuel and on the other hand an oxidising gas and which open into this end plate. The means for delivering the solid fuel consist of a central pipe (3) which is arranged along the longitudinal axis of the body of the burner (1), and the means for delivering the oxidising gas are constituted by a plurality of peripheral pipes (4) arranged around the central pipe (3). Preferably, the central pipe (3) ends in a channel (5) which has internally a diverging longitudinal profile, and at least one of the peripheral pipes (4) comprises a terminal part (7) which has internally a longitudinal profile in the form of Laval nozzles. <IMAGE>

Description

La présente invention concerne un brûleur à combustible solide, en particulier un brûleur à charbon finement divisé.The present invention relates to a solid fuel burner, in particular a finely divided coal burner.

Ce type de brûleur peut être utilisé chaque fois qu'il faut réaliser une combustion très intense et une flamme très courte, en particulier dans le cas de faibles rapports oxygène/carbone, et spécialement pour l'injection de charbon pulvérisé dans un haut fourneau. Pour assurer la combustion de ce charbon, le brûleur comporte des moyens d'injection d'un gaz oxydant, tel que l'air, l'oxygène, un mélange air-oxygène ou un mélange oxygène-vapeur d'eau.This type of burner can be used whenever there is a need for very intense combustion and a very short flame, in particular in the case of low oxygen / carbon ratios, and especially for the injection of pulverized coal in a blast furnace. To ensure the combustion of this coal, the burner includes means for injecting an oxidizing gas, such as air, oxygen, an air-oxygen mixture or an oxygen-water vapor mixture.

On connaît déjà de nombreux brûleurs basés sur le principe du post-mélange", c'est-à-dire construits de telle façon que le combustible et le comburant sortent séparément du brûleur et se rencontrent à l'extérieur de celui-ci, à une certaine distance de l'extrémité de sortie du brûleur. Une telle disposition permet d'éviter tout risque de retour de flamme. Ces brûleurs sont cependant conçus, en général, pour utiliser un ou plusieurs combustibles liquides ou gazeux, lesquels peuvent être aisément atomisés et/ou mélangés à l'air de combustion.Many burners are already known based on the principle of post-mixing ", that is to say constructed in such a way that the fuel and the oxidizer exit separately from the burner and meet outside of it, at a certain distance from the outlet end of the burner. This arrangement avoids any risk of flashback. These burners are, however, generally designed to use one or more liquid or gaseous fuels, which can be easily atomized and / or mixed with combustion air.

La présente invention propose un brûleur du type dit "'à post-mélange", destiné à l'utilisation d'un combustible solide tel que du charbon finement divisé, qui ne présente pas de risque de bouchage et qui assure une combustion très intense du combustible solide.The present invention provides a burner of the so-called "post-mix" type, intended for the use of a solid fuel such as finely divided coal, which does not present a risk of clogging and which ensures very intense combustion of the solid fuel.

Conformément à la présente invention, un brûleur à combustible solide, comportant un corps de brûleur, de préférence cylindrique, fermé par une plaque d'extrémité, ainsi que des moyens servant à amener d'une part un combustible solide et d'autre part un gaz oxydant et débouchant dans ladite plaque d'extrémité, est caractérisé en ce que les moyens pour amener le combustible solide consistent en un conduit central, disposé suivant l'axe longitudinal dudit corps de brûleur, en ce que les moyens pour amener le gaz oxydant sont constitués par une pluralité de conduits périphériques disposés autour dudit conduit central et en ce que le volume intérieur dudit corps de brûleur, autour dudit conduit central et desdits conduits périphériques, constitue un circuit de refroidissement du brûleur.According to the present invention, a solid fuel burner, comprising a burner body, preferably cylindrical, closed by an end plate, as well as means serving on the one hand for solid fuel and on the other hand for a oxidizing gas and opening into said end plate, is characterized in that the means for supplying the solid fuel consist of a central duct, arranged along the longitudinal axis of said burner body, in that the means for supplying the oxidizing gas are constituted by a plurality of peripheral conduits arranged around said central conduit and in that the interior volume of said burner body, around said central conduit and said peripheral conduits, constitutes a cooling circuit of the burner.

Selon l'invention, les conduits périphériques sont parallèles au conduit central et ils sont de préférence répartis uniformément autour du conduit central.According to the invention, the peripheral conduits are parallel to the central conduit and they are preferably distributed uniformly around the central conduit.

Dans le brûleur conforme à l'invention, le conduit central et/ou les conduits périphériques peuvent être constitués par des tubes de section constante. Dans ce cas, le jet de combustible finement divisé, généralement transporté par un gaz porteur sous pression, éclate à la sortie du conduit central et se mélange au gaz oxydant sortant des conduits périphériques.In the burner according to the invention, the central duct and / or the peripheral ducts can be constituted by tubes of constant section. In this case, the finely divided fuel jet, generally transported by a pressurized carrier gas, bursts at the outlet of the central duct and mixes with the oxidizing gas leaving the peripheral ducts.

Il a cependant été jugé préférable de donner audit conduit central, à son extrémité de sortie, un profil longitudinal divergent. Un tel profil favorise l'éclatement du jet de combustible solide et la dispersion de celui-ci dans le gaz oxydant.However, it was considered preferable to give said central duct, at its outlet end, a divergent longitudinal profile. Such a profile favors the burst of the solid fuel jet and the dispersion of the latter in the oxidizing gas.

De manière analogue, il s'est avéré intéressant de doter la partie terminale des conduits périphériques d'un profil longitudinal et/ou d'une orientation appropriée pour favoriser le mélange du gaz oxydant avec le combustible solide sortant du conduit central.Similarly, it has been found to be advantageous to provide the terminal portion of the peripheral conduits with a longitudinal profile and / or with an appropriate orientation to promote mixing of the oxidizing gas with the solid fuel leaving the central conduit.

Selon une variante particulière de l'invention, la partie terminale d'­au moins un des conduits périphériques est dotée intérieurement d'un profil longitudinal en forme de tuyère de Laval, c'est-à-dire comportant un tronçon convergent, un col et un tronçon divergent se succédant dans le sens de circulation du gaz oxydant.According to a particular variant of the invention, the terminal part of at least one of the peripheral conduits is internally provided with a longitudinal profile in the shape of a Laval nozzle, that is to say comprising a convergent section, a neck and a divergent section succeeding one another in the direction of circulation of the oxidizing gas.

Les dimensions de la tuyère de Laval, à savoir le diamètre et la longueur axiale du col, ainsi que les angles d'ouverture et les longueurs axiales des tronçons convergent et divergent, sont déterminées, de façon connue en soi, en fonction du débit et des caractéristiques dynamiques désirées du jet de gaz oxydant à réaliser.The dimensions of the Laval nozzle, namely the diameter and the axial length of the neck, as well as the opening angles and the axial lengths of the converging and diverging sections, are determined, in a manner known per se, as a function of the flow rate and desired dynamic characteristics of the oxidizing gas jet to be produced.

Par ailleurs, on sait que la flamme peut prendre naissance en un point plus ou moins éloigné de la face de sortie du brûleur, notamment en fonction de la vitesse de sortie du gaz oxydant et du combustible solide. Ces vitesses exercent également une influence sur la longueur de la flamme.Furthermore, it is known that the flame can arise at a point more or less distant from the outlet face of the burner, in particular as a function of the outlet speed of the oxidizing gas and of the solid fuel. These speeds also influence the length of the flame.

Selon une autre variante de l'invention, au moins un des conduits périphériques se termine, à son embouchure dans la plaque d'extrémité du corps de brûleur, par un canal incliné par rapport à l'axe longitudinal dudit conduit.According to another variant of the invention, at least one of the peripheral conduits ends, at its mouth in the end plate of the burner body, by a channel inclined relative to the longitudinal axis of said conduit.

Cette inclinaison peut être telle que les axes de ces parties termi­nales coupent l'axe longitudinal du brûleur, à l'extérieur de celui-ci et en avant par rapport à la plaque d'extrémité. Les axes des parties terminales de tous les conduits périphériques peuvent avoir la même inclinaison; ils se coupent alors tous au même point et ils forment ainsi une surface convergente. Selon cet angle d'inclinaison, la flamme obtenue sera en général plutôt longue et confinée.This inclination may be such that the axes of these end portions intersect the longitudinal axis of the burner, outside of the latter and forwardly relative to the end plate. The axes of the terminal parts of all the peripheral conduits can have the same inclination; they all intersect at the same point and thus form a converging surface. According to this angle of inclination, the flame obtained will generally be rather long and confined.

A l'inverse, si lesdits axes ont la même inclinaison et se coupent en un même point situé à l'intérieur du brûleur, ils forment une surface divergente et il en résultera une flamme plutôt courte et évasée, suivant l'angle d'inclinaison choisi.Conversely, if said axes have the same inclination and intersect at the same point located inside the burner, they form a divergent surface and this will result in a rather short and flared flame, depending on the angle of inclination. selected.

Dans l'un ou l'autre cas, et toujours selon l'invention, les axes des­dites parties terminales peuvent avoir une inclinaison quelconque, et même ne pas couper l'axe longitudinal du corps de brûleur. Il est ainsi possible, notamment, de conférer à la flamme un mouvement de rotation qui peut, le cas échéant, lui assurer un pouvoir de pénétra­tion accru.In either case, and still according to the invention, the axes of said end parts can have any inclination, and even do not cut the longitudinal axis of the burner body. It is thus possible, in particular, to impart to the flame a rotational movement which can, if necessary, provide it with increased penetrating power.

L'invention est illustrée, à titre de simple exemple de réalisation, par les dessins annexés, dans lesquels la

  • figure 1 montre en coupe axiale partielle, une disposition de brûleur conforme à l'invention; la
  • figure 2 représente, en coupe axiale, une autre disposition de brûleur conforme à l'invention; la
  • figure 3 illustre, en coupe axiale, un type de profil intérieur pour la partie terminale d'un conduit périphérique, pour un brûleur d'un type correspondant aux figures 1 et 2.
The invention is illustrated, by way of simple example of embodiment, by the appended drawings, in which the
  • Figure 1 shows in partial axial section, a burner arrangement according to the invention; the
  • 2 shows, in axial section, another burner arrangement according to the invention; the
  • FIG. 3 illustrates, in axial section, a type of interior profile for the terminal part of a peripheral duct, for a burner of a type corresponding to FIGS. 1 and 2.

Ces figures ne constituent que des représentations schématiques de l'objet de l'invention. En particulier, on n'a pas reproduit les éléments qui ne sont pas nécessaires à une bonne compréhension de l'invention. En outre, des éléments identiques ou analogues sont désignés par les mêmes repères numériques dans toutes les figures.These figures are only schematic representations of the subject of the invention. In particular, the elements which are not necessary for a good understanding of the invention have not been reproduced. In addition, identical or analogous elements are designated by the same reference numerals in all the figures.

Dans la figure 1, on a représenté, en coupe partielle, une disposition de brûleur comportant un corps de brûleur 1 cylindrique, à l'extrémité duquel est fixée, par exemple par soudage, une plaque d'extrémité ou plaque de sortie 2. A l'intérieur du corps de brûleur 1 sont disposés d'une part un conduit central 3 et des conduits périphériques 4 entourant le conduit central 3. Le conduit central 3 est disposé suivant l'axe longitudinal du corps de brûleur 1; les conduits périphériques 4 sont disposés autour du conduit central 3 et parallèlement à celui-ci, ils sont par exemple au nombre de 6 et espacés angulairement de 60°. Les conduits 3 et 4 sont cylindriques et ils débouchent parallèlement l'un à l'autre dans la plaque de sortie 2. L'embouchure proprement dite du conduit central 3 est située légèrement en retrait par rapport à celle des conduits périhériques 4. Elle est localisée dans un canal 5 formé dans la plaque de sortie 2 et présentant intérieurement un profil longitudinal divergent.In Figure 1, there is shown, in partial section, a burner arrangement comprising a cylindrical burner body 1, at the end of which is fixed, for example by welding, an end plate or outlet plate 2. A inside the burner body 1 are arranged on the one hand a central duct 3 and peripheral ducts 4 surrounding the central duct 3. The central duct 3 is arranged along the longitudinal axis of the burner body 1; the peripheral conduits 4 are arranged around the central conduit 3 and parallel to the latter, they are for example 6 in number and angularly spaced by 60 °. The conduits 3 and 4 are cylindrical and they open parallel to each other in the outlet plate 2. The mouth itself of the central conduit 3 is situated slightly behind that of the peripheral conduits 4. It is located in a channel 5 formed in the outlet plate 2 and having internally a divergent longitudinal profile.

Le volume intérieur 6 du corps de brûleur 1 est parcouru par un agent de refroidissement.The internal volume 6 of the burner body 1 is traversed by a cooling agent.

Le conduit central 3 et les conduits périphériques sont raccordés, à l'arrière du brûleur, respectivement à une source de combustible solide et à une source de gaz oxydant, non repésentées mais symbolisées par les flèches C et O₂.The central duct 3 and the peripheral conduits are connected, at the rear of the burner, respectively to a source of solid fuel and to a source of oxidizing gas, not shown but symbolized by the arrows C and O₂.

Le profil divergent du canal de sortie 5 provoque l'éclatement et l'expansion du jet de combustible solide sortant du conduit central 3. Ce combustible solide finement divisé se mélange alors au gaz oxydant sortant des conduits périphériques 4 et la combustion se déclenche ainsi à une certaine distance en avant du brûleur.The divergent profile of the outlet channel 5 causes the solid fuel jet leaving the central duct 3 to burst and expand. This finely divided solid fuel then mixes with the oxidizing gas leaving the peripheral ducts 4 and combustion is thus initiated at a certain distance in front of the burner.

La figure 2 illustre une disposition permettant d'améliorer encore le mélange du combustible solide et du gaz oxydant.Figure 2 illustrates an arrangement for further improving the mixture of solid fuel and oxidizing gas.

Ici également, le conduit central 3 se termine par un canal de sortie 5 qui présente intérieurement un profil longitudinal divergent.Here too, the central duct 3 ends in an outlet channel 5 which has internally a divergent longitudinal profile.

En outre, les conduits périphériques 4, ou tout au moins une partie d'entre eux, présentent une partie terminale 7 intérieurement profilée en tuyère de Laval.In addition, the peripheral conduits 4, or at least a part of them, have a terminal part 7 internally profiled in Laval nozzle.

Les jets de gaz oxydant sortant des tuyères 7 sont expansés et se mélangent plus intimement au combustible solide, assurant une meilleure combustion de ce dernier.The jets of oxidizing gas leaving the nozzles 7 are expanded and mix more intimately with the solid fuel, ensuring better combustion of the latter.

Au lieu d'une tuyère de Laval, un conduit périphérique 4 peut également être pourvu d'un embout dirigeant le jet de gaz oxydant suivant une direction quelconque désirée. La figure 3 représente un type d'embout 8 utilisable avec un brûleur conforme à l'invention tel que celui de la figure 2. L'embout 8 présente une portée filetée 9 grâce à laquelle il peut être vissé dans un alésage fileté correspondant 10 ménagé à l'extrémité d'un conduit périphérique 4 (figure 2). Cet embout 8 est doté d'un passage axial 11 qui vient se placer dans le prolongement du conduit périphérique 4 et qui se termine, côté sortie, par un canal oblique 12. Ce canal 12 peut être orienté dans un plan radial du conduit périphérique 4, de manière à former, avec les canaux 12 des autres conduits périphériques 4, une surface conique soit convergente soit divergente. Les canaux 12 peuvent également être orientés de telle manière que leurs axes ne coupent pas l'axe longitudinal du corps du brûleur 1.En particulier, ils peuvent former une surface gauche, telle qu'un hyperboloïde de révolution pour imprimer au mélange et à la flamme qui en résulte un mouvement de rotation autour de son axe longitudinal.Instead of a Laval nozzle, a peripheral conduit 4 can also be provided with a nozzle directing the jet of oxidizing gas in any desired direction. FIG. 3 represents a type of nozzle 8 usable with a burner according to the invention such as that of FIG. 2. The nozzle 8 has a threaded surface 9 thanks to which it can be screwed into a corresponding threaded bore 10 formed at the end of a peripheral conduit 4 (Figure 2). This nozzle 8 has an axial passage 11 which comes place in the extension of the peripheral conduit 4 and which ends, on the outlet side, by an oblique channel 12. This channel 12 can be oriented in a radial plane of the peripheral conduit 4, so as to form, with the channels 12 of the other peripheral conduits 4, a conical surface either convergent or divergent. The channels 12 can also be oriented in such a way that their axes do not intersect the longitudinal axis of the body of the burner 1. In particular, they can form a left surface, such as a hyperboloid of revolution to impart the mixture and the flame which results in a rotational movement around its longitudinal axis.

L'invention n'est évidemment pas limitée aux exemples de réalisation qui viennent d'être décrits et illustrés. Diverses modifications peuvent y être apportées, notamment dans la constitution des parties d'extrémité des conduits périphériques, sans sortir du cadre des revendications qui suivent.The invention is obviously not limited to the exemplary embodiments which have just been described and illustrated. Various modifications can be made to it, in particular in the constitution of the end parts of the peripheral conduits, without going beyond the ambit of the claims which follow.

Claims (8)

1. Brûleur à combustible solide, comportant un corps de brûleur (1) fermé par une plaque d'extrémité (2), ainsi que des moyens servant à amener d'une part un combustible solide et d'autre part un gaz oxydant et débouchant dans ladite plaque d'extrémité, caractérisé en ce que les moyens pour amener le combustible solide consistent en un conduit central (3) disposé suivant l'axe longitudinal dudit corps de brûleur (1), en ce que les moyens pour amener le gaz oxydant sont constitués par une pluralité de conduits périphériques (4) disposés autour dudit conduit central (3) et en ce que le volume intérieur (6) dudit corps de brûleur (1), autour dudit conduit central (3) et desdits conduits périphériques (4), constitue un circuit de refroidissement du brûleur.1. Solid fuel burner, comprising a burner body (1) closed by an end plate (2), as well as means serving on the one hand for solid fuel and on the other hand for an oxidizing and opening gas in said end plate, characterized in that the means for supplying the solid fuel consist of a central duct (3) arranged along the longitudinal axis of said burner body (1), in that the means for supplying the oxidizing gas consist of a plurality of peripheral conduits (4) arranged around said central conduit (3) and in that the interior volume (6) of said burner body (1), around said central conduit (3) and said peripheral conduits (4 ), constitutes a burner cooling circuit. 2. Brûleur suivant la revendication 1, caractérisé en ce que les conduits périphériques (4) sont parallèles audit conduit central (3).2. Burner according to claim 1, characterized in that the peripheral conduits (4) are parallel to said central conduit (3). 3. Brûleur suivant l'une ou l'autre des revendications 1 et 2, caracté­risé en ce que lesdits conduits périphériques (4) sont répartis uni­formément autour du conduit central (3).3. Burner according to either of claims 1 and 2, characterized in that said peripheral conduits (4) are distributed uniformly around the central conduit (3). 4. Brûleur suivant l'une ou l'autre des revendications 1 à 3, caracté­risé en ce que le conduit central (3) se termine, à son embouchure dans la plaque d'extrémité (2), par un canal (5) présentant intérieu­rement un profil longitudinal divergent.4. Burner according to either of claims 1 to 3, characterized in that the central duct (3) ends, at its mouth in the end plate (2), by a channel (5) having internally a diverging longitudinal profile. 5. Brûleur suivant l'une ou l'autre des revendications 1 à 4, carac­térisé en ce qu'au moins un desdits conduits périphériques (4) comporte une partie terminale (7) présentant intérieurement un profil longitudinal en tuyère de Laval.5. Burner according to either of claims 1 to 4, characterized in that at least one of said peripheral conduits (4) has an end portion (7) having internally a longitudinal profile in Laval nozzle. 6. Brûleur suivant l'une ou l'autre des revendications 1 à 5, caracté­risé en ce qu'au moins un desdits conduits périphériques (4) se termine, à son embouchure dans la plaque d'extrémité (2), par un canal (12) incliné par rapport à l'axe longitudinal dudit conduit (4).6. Burner according to either of claims 1 to 5, characterized in that at least one of said peripheral conduits (4) ends, at its mouth in the end plate (2), by a channel (12) inclined relative to the longitudinal axis of said conduit (4). 7. Brûleur suivant la revendication 6, caractérisé en ce que les axes desdits canaux inclinés (12) coupent l'axe longitudinal du corps de brûleur (1) et forment une surface conique autour dudit axe.7. Burner according to claim 6, characterized in that the axes of said inclined channels (12) intersect the longitudinal axis of the burner body (1) and form a conical surface around said axis. 8. Brûleur suivant la revendication 6, caractérisé en ce que les axes desdits canaux inclinés (12) ne coupent pas l'axe longitudinal du corps de brûleur (1) et forment une surface gauche de révolution autour dudit axe.8. Burner according to claim 6, characterized in that the axes of said inclined channels (12) do not intersect the longitudinal axis of the burner body (1) and form a left surface of revolution around said axis.
EP89870159A 1988-10-31 1989-10-24 Solid-fuel burner Expired - Lifetime EP0368829B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8801251A BE1002580A6 (en) 1988-10-31 1988-10-31 SOLID FUEL BURNER.
BE8801251 1988-10-31

Publications (3)

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EP0368829A2 true EP0368829A2 (en) 1990-05-16
EP0368829A3 EP0368829A3 (en) 1991-03-27
EP0368829B1 EP0368829B1 (en) 1995-03-15

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EP89870159A Expired - Lifetime EP0368829B1 (en) 1988-10-31 1989-10-24 Solid-fuel burner

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EP (1) EP0368829B1 (en)
AT (1) ATE119986T1 (en)
BE (1) BE1002580A6 (en)
DE (1) DE68921697T2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633428A1 (en) * 1993-07-08 1995-01-11 ROLLS-ROYCE POWER ENGINEERING plc Low NOx air and fuel/air nozzle assembly
WO1997009566A1 (en) * 1995-09-07 1997-03-13 Voest-Alpine Industrieanlagenbau Gmbh Process for burning fuel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT402440B (en) * 1995-06-01 1997-05-26 Voest Alpine Ind Anlagen BURNER

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2080513A (en) * 1980-07-21 1982-02-03 Kloeckner Humboldt Deutz Ag A solid fuel burner
DE3334156A1 (en) * 1982-10-04 1984-04-05 Brennstoffinstitut Freiberg, Ddr 9200 Freiberg Coal dust burner and process for its operation
US4628832A (en) * 1986-01-29 1986-12-16 Coen Company, Inc. Dual fuel pilot burner for a furnace
DE3541616A1 (en) * 1985-11-25 1987-05-27 Krupp Polysius Ag Burner for pulverulent fuel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2080513A (en) * 1980-07-21 1982-02-03 Kloeckner Humboldt Deutz Ag A solid fuel burner
DE3334156A1 (en) * 1982-10-04 1984-04-05 Brennstoffinstitut Freiberg, Ddr 9200 Freiberg Coal dust burner and process for its operation
DE3541616A1 (en) * 1985-11-25 1987-05-27 Krupp Polysius Ag Burner for pulverulent fuel
US4628832A (en) * 1986-01-29 1986-12-16 Coen Company, Inc. Dual fuel pilot burner for a furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0633428A1 (en) * 1993-07-08 1995-01-11 ROLLS-ROYCE POWER ENGINEERING plc Low NOx air and fuel/air nozzle assembly
WO1997009566A1 (en) * 1995-09-07 1997-03-13 Voest-Alpine Industrieanlagenbau Gmbh Process for burning fuel
US6142765A (en) * 1995-09-07 2000-11-07 Vost-Alpine Industrieanlagenbau Gmbh Process for burning fuel

Also Published As

Publication number Publication date
EP0368829B1 (en) 1995-03-15
ATE119986T1 (en) 1995-04-15
DE68921697D1 (en) 1995-04-20
EP0368829A3 (en) 1991-03-27
DE68921697T2 (en) 1995-11-09
BE1002580A6 (en) 1991-04-02

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