[go: up one dir, main page]

EP1122494A1 - Gas burners for heating a gas flowing in a duct - Google Patents

Gas burners for heating a gas flowing in a duct Download PDF

Info

Publication number
EP1122494A1
EP1122494A1 EP00403424A EP00403424A EP1122494A1 EP 1122494 A1 EP1122494 A1 EP 1122494A1 EP 00403424 A EP00403424 A EP 00403424A EP 00403424 A EP00403424 A EP 00403424A EP 1122494 A1 EP1122494 A1 EP 1122494A1
Authority
EP
European Patent Office
Prior art keywords
holes
tube
gas
burner according
tubing
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
EP00403424A
Other languages
German (de)
French (fr)
Other versions
EP1122494B1 (en
Inventor
Frédéric Bury
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.)
Entreprise Generale de Chauffage Industriel Pillard SA
Original Assignee
Entreprise Generale de Chauffage Industriel Pillard SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Entreprise Generale de Chauffage Industriel Pillard SA filed Critical Entreprise Generale de Chauffage Industriel Pillard SA
Publication of EP1122494A1 publication Critical patent/EP1122494A1/en
Application granted granted Critical
Publication of EP1122494B1 publication Critical patent/EP1122494B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • F23C6/045Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure
    • F23C6/047Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection with staged combustion in a single enclosure with fuel supply in stages
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details, e.g. noise reduction means
    • F23D14/72Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74Preventing flame lift-off
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/061Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
    • F23G7/065Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00Staged combustion
    • F23C2201/20Burner staging
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2201/00Staged combustion
    • F23C2201/30Staged fuel supply
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2900/00Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/21Burners specially adapted for a particular use
    • F23D2900/21003Burners specially adapted for a particular use for heating or re-burning air or gas in a duct

Definitions

  • the subject of the present invention is a improvement to gas burners for heating of a gas flowing in a conduit.
  • burners indifferently the whole of a ramp made up of several elementary blocks or an elementary block in himself.
  • the main applications of the invention are the heating of the turbine gases in the co-generation facilities.
  • This post burner combustion improves the overall efficiency of the installation, to modulate the production of steam by according to needs and incidentally to maintain this production in the event of a shutdown of the gas turbine.
  • a fan that draws in ambient air supplies the oxidant necessary for the burners instead and place exhaust gases from the turbine.
  • Such burners must be able to operate with a stable flame under very conditions different either with turbine gas at temperature from 300 to 600 ° C and composed of 11 to 15% oxygen, i.e. with ambient air.
  • An example of this type of burner is described in European patent 313,469 published on 23 April 1989 on behalf of the company MECANIQUE GENERALE TURBINE FIREPLACES.
  • the problem is therefore to be able to realize and to operate a burner called "vein" in respecting the above regulatory values while preserving good flame stability.
  • a solution to the problem posed is a known type intended to be placed in a conduit for heating a gas circulating in this conduit and comprising a tube capable of being arranged transversely relative to to the direction of circulation of said gas, supplied with gas fuel and drilled with at least two holes aligned on the same generator, possibly fitted with injectors, and making it possible to emit jets of combustible gas directed downstream; a flame stabilizer formed by two divergent wings forming a deflector on the part and on the other side of said generator, is fixed on said tube and deflects the flow of oxidant gas to create downstream of the burner bank a protected area where the flame can develop.
  • At least one of said holes is extended by tubing extending beyond the edges wings and pierced by at least one opening fuel gas ejection at its distal end.
  • Such tubing thus injects part of the combustible gas at for example at least 100 mm downstream other orifices not carrying tubing, allowing the staging of the injection of this gas and of the combustion flames obtained, and therefore the reduction in percentage of nitrogen oxides NOx produced: in fact, the main flame thus obtained by this injection stepped, and which is therefore further from the stabilizer deflector, is more airy; combustion occurs at stronger excess air therefore at lower temperature, this which produces a strong reduction in the formation of nitrogen oxides of mainly thermal origin, and the higher the staging, the more nitrogen oxides are reduced.
  • the present invention makes it possible inter alia to remedy this defect: the NOx reduction principle is always the spreading of the gas but this staging is performed axially instead of radial. To avoid CO formation just keep by conventional orifices without tubing sufficient flow (less than 30% of the overall fuel gas flow) for create a pilot flame ensuring ignition and stability of the main flame from staged injection.
  • the distal end of the tubing has at least four different ejection ports and the gas can then be ejected through these various corner holes different instead of a single hole in the axis of the tube.
  • the axes of ejection of the orifices are inclined two by two on the one hand by an angle ⁇ of 20 to 50 ° on either side of the plane defined by the generator of alignment of the holes and the axis of the tube and on the other hand with an angle ⁇ of 10 to 30 ° on both sides from the plane perpendicular to the previous one and passing through the hole extended by said tubing.
  • These angles ⁇ and ⁇ are important for the quality of the results and should be determined according to the dimensions of the burner and the fireplace on which it is mounted.
  • This tube 1 is supplied with combustible gas 10 and is drilled with at least two holes 3 per burner block, aligned on the same generator 18 parallel therefore to the axis XX 'of the tube; a flame stabilizer 2 formed by two diverging wings 12 forming deflectors of on either side of said generator 18 is fixed on said tube 1.
  • said deflector stabilizer 2 may include walls 13 1 , 13 2 forming reinforcement ribs at the ends, in the direction of axis XX ′, of the wings 12 of each burner block, as well as ribs 14 1 , 14 2 intermediate when the burner block has several holes 3 and therefore requires an intermediate reinforcement of the wings 2; these may include a break 22, towards their outer edges 17 downstream relative to the direction A of circulation of the oxidizing gases, to stiffen the latter and improve the aerodynamics of the burner block.
  • At least one of said holes 3 is extended by a tube 11 extending beyond the outer edges 17 of the wings 12 and pierced with at least one 9 gas ejection port 10 fuel to sound distal end.
  • the premix by Venturi system using a nozzle converging diverging 8 as shown in the Figure 2 and described in patent application EP 313 469 is not essential for the proper functioning of the burner: the present invention thus applies to all types of “vein” burners with stabilizer deflector, but including or not including such a device Venturi.
  • the distal end of the tubing 11 has several divergent ejection orifices 9 whose ejection axes are inclined by an angle ⁇ by relation to plan AA 'defined by the generator 18 of alignment of the holes 3 and the axis XX 'of the tube 1, and of a angle ⁇ with respect to the plane BB 'perpendicular to the previous and passing through hole 3 extended by said tubing 11.
  • the number of orifices, their ejection angle ⁇ and ⁇ and their passage diameter are a function of the oxidizer speed and duct dimensions in which one has the burner, (and therefore the distance between the ramps that compose it), in order to be able adapt and optimize the penetration of the fuel in the oxidizer vein.
  • said distal end 25 of tubing 11 may be interchangeable and fixed by a threading system or other.
  • their axes can be tilted two by two, with an angle ⁇ of 20 to 50 ° on either side of the plane AA ' and at an angle ⁇ of 10 to 30 ° on either side of the plane BB '.
  • a burner block such as that shown in Figure 2 can be easily modified by adding parts complementary corresponding to these fins 24 and arranged beyond the break 22 of the wings 12 corresponding to edges 17: the position and dimensions of these fins 24 having a significant effect on the results it is interesting to have the possibility to change them if necessary thanks to their realization by added piece.
  • the obstacle 15 possibly placed opposite one of the said holes 3 not extended by the tubing 11 can be worn, by a collar or fixing crown 16, on the tubing 11 with regard to the holes or orifices 3 ejection placed on either side of it.
  • Said obstacle 15 is for example cylindrical and its axis is perpendicular to that of hole 3 opposite which it is willing.
  • this one may have at least three holes 3, one of which them 3 'is associated with the pipe 11, the obstacle 15 to a another hole 3 'adjacent to that associated with the tubing 11 and the last hole is free.
  • a burner block can have a number of holes in any fact, for example between two and ten and the tubing 11 can be arranged in a regular manner for example in every second hole, every third hole or one hole in four, etc ...
  • the following burner block the invention comprises five holes 3 in which the tubing 11 is associated with the central hole, the two holes adjacent to it being associated with an obstacle 15 and the two end holes being free.
  • Such burners according to the invention may also include elements characteristic of the burners, as described in patent EP 313 469, and such as in particular, in front of at least one hole 3 2 not extended by a pipe 11 and coaxial with that here, a diverging convergent nozzle 8 capable of causing the jet of gas ejected through said hole 3 2 to create a vacuum at the inlet of the nozzle 8, as shown in FIG. 4.
  • Said inlet communicates with the outer face or extra back of at least one of the wings 12 of the stabilizer 2 through at least one opening 7.
  • the space between the nozzles 8 and the tube 1 is closed by two wall elements 4 fixed on the tube and arranged almost parallel to the plane defined by the generator 18 for aligning the holes 3 and the axis XX 'of the tube 1 and by a front wall 5 connected to said wall elements 4 and carrying the nozzles; the openings 7 are drilled in said wall elements 4.
  • the obstacle 15 may be a cylindrical tube with a diameter d 15 of approximately 10 mm and placed at a distance a of the order of 25 mm from the outlet of the nozzles 8; the length L 15 of such obstacles fixed on the tube 11 can be of the order of 85 to 90 mm depending on the distance separating two adjacent holes or orifices 3; the diameter D 1 of the fuel supply tube is of the order of 85 to 90 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Gas Burners (AREA)

Abstract

Le secteur technique de l'invention est la réalisation de brûleurs dits « en veine » car placés directement à l'intérieur du conduit de circulation d'un gaz, pour réchauffer celui-ci, lesquels brûleurs étant disposés en rampes composées en général de blocs élémentaires. De tels brûleurs comportent un tube (1) d'axe XX' apte à être disposé transversalement par rapport à la direction de circulation desdits gaz, alimentés en gaz combustible (10) et percé d'au moins deux trous (3) alignés sur une même génératrice et un stabilisateur de flamme (2) formé par deux ailes (12) divergentes formant déflecteurs de part et d'autre de ladite génératrice. Selon l'invention au moins un desdits trous (3) est prolongé par une tubulure (11) s'étendant au-delà des bords extérieurs (17) des ailes (12) et percée d'au moins un orifice (9) d'éjection du gaz (10) combustible à son extrémité distale. <IMAGE>The technical sector of the invention is the production of so-called “vein” burners because they are placed directly inside the gas circulation duct, to heat the latter, which burners being arranged in ramps generally composed of blocks elementary. Such burners comprise a tube (1) of axis XX ′ capable of being arranged transversely with respect to the direction of circulation of said gases, supplied with combustible gas (10) and pierced with at least two holes (3) aligned on a same generator and a flame stabilizer (2) formed by two divergent wings (12) forming deflectors on either side of said generator. According to the invention at least one of said holes (3) is extended by a tube (11) extending beyond the outer edges (17) of the wings (12) and pierced with at least one orifice (9) of ejection of combustible gas (10) at its distal end. <IMAGE>

Description

La présente invention a pour objet un perfectionnement aux brûleurs à gaz pour le chauffage d'un gaz circulant dans un conduit.The subject of the present invention is a improvement to gas burners for heating of a gas flowing in a conduit.

Le secteur technique est la réalisation de brûleurs dits « en veine » car placés directement à l'intérieur du conduit de circulation du gaz, lesquels brûleurs étant disposés en rampes composées en général de blocs élémentaires et disposées transversalement par rapport à la direction de circulation du gaz.The technical sector is the realization of so-called “vein” burners because they are placed directly at inside the gas circulation pipe, which burners being arranged in compound ramps in general of elementary blocks and arranged transversely by relative to the direction of gas flow.

Dans la présente description on désignera par brûleurs indifféremment l'ensemble d'une rampe composée de plusieurs blocs élémentaires ou un bloc élémentaire en lui-même.In the present description, we will denote by burners indifferently the whole of a ramp made up of several elementary blocks or an elementary block in himself.

Les applications principales de l'invention sont le réchauffage des gaz de turbines dans les installations de co-génération. Ce brûleur dit de post combustion permet d'améliorer le rendement global de l'installation, de moduler la production de vapeur en fonction des besoins et accessoirement de maintenir cette production en cas d'arrêt de la turbine à gaz. Dans ce cas, un ventilateur aspirant de l'air ambiant fournit le comburant nécessaire aux brûleurs en lieu et place des gaz d'échappement de la turbine.The main applications of the invention are the heating of the turbine gases in the co-generation facilities. This post burner combustion improves the overall efficiency of the installation, to modulate the production of steam by according to needs and incidentally to maintain this production in the event of a shutdown of the gas turbine. In this case, a fan that draws in ambient air supplies the oxidant necessary for the burners instead and place exhaust gases from the turbine.

De tels brûleurs doivent pouvoir fonctionner avec une flamme stable dans des conditions très différentes soit avec du gaz de turbine à la température de 300 à 600°C et composé de 11 à 15% d'oxygène, soit avec de l'air ambiant. Un exemple de ce type de brûleur est décrit dans le brevet européen 313 469 publié le 23 Avril 1989 au nom de la société MECANIQUE GENERALE FOYERS TURBINE.Such burners must be able to operate with a stable flame under very conditions different either with turbine gas at temperature from 300 to 600 ° C and composed of 11 to 15% oxygen, i.e. with ambient air. An example of this type of burner is described in European patent 313,469 published on 23 April 1989 on behalf of the company MECANIQUE GENERALE TURBINE FIREPLACES.

La réglementation française concernant les émissions de ce type d'installation a été récemment complétée par l'arrêté du Ministère de l'Aménagement du Territoire et de l'Environnement français du 11 Août 1999 qui limite les émissions d'oxydes d'azote et d'oxydes de carbone, en particulier pour les chaudières utilisées en post combustion, à des valeurs données qui sont un maximum de production de 200 mg/Nm3 pour les oxydes d'azote NOx et 250 mg/Nm3 pour les oxydes de carbone CO.French regulations concerning emissions from this type of installation were recently supplemented by the French Minister of Territorial Planning and Environment's decree of August 11, 1999, which limits emissions of nitrogen oxides and d carbon oxides, in particular for boilers used in post combustion, at given values which are a production maximum of 200 mg / Nm 3 for nitrogen oxides NOx and 250 mg / Nm 3 for carbon oxides CO .

Les brûleurs tels que décrits dans le brevet européen cité ci-dessus permettent de respecter cet arrêté lors du fonctionnement avec du gaz de turbine ; cependant, et bien que certains dispositifs soient décrits dans ce brevet pour réduire les émissions d'oxydes d'azote, ils ne permettent pas dans la plupart des cas d'obtenir les valeurs réglementaires lors du fonctionnement de la post combustion seulement en air ambiant.The burners as described in the patent European mentioned above allow to respect this stopped during operation with turbine gas; however, and although some devices are described in this patent to reduce emissions nitrogen oxides they don't allow in most cases of obtaining regulatory values when post combustion operation only in air ambient.

Le problème posé est donc de pouvoir réaliser et de faire fonctionner un brûleur dit « en veine » en respectant les valeurs réglementaires ci-dessus tout en préservant une bonne stabilité de flamme.The problem is therefore to be able to realize and to operate a burner called "vein" in respecting the above regulatory values while preserving good flame stability.

Un solution au problème posé est un brûleur de type connu destiné à être placé dans un conduit pour chauffer un gaz circulant dans ce conduit et comportant un tube apte à être disposé transversalement par rapport à la direction de circulation dudit gaz, alimenté en gaz combustible et percé d'au moins deux trous alignés sur une même génératrice, éventuellement munis d'injecteurs, et permettant d'émettre des jets de gaz combustible dirigés vers l'aval ; un stabilisateur de flamme formé par deux ailes divergentes formant déflecteur de part et d'autre de ladite génératrice, est fixé sur ledit tube et sert à dévier le courant de gaz comburant pour créer en aval de la rampe de brûleurs une zone protégée où la flamme peut se développer. A solution to the problem posed is a known type intended to be placed in a conduit for heating a gas circulating in this conduit and comprising a tube capable of being arranged transversely relative to to the direction of circulation of said gas, supplied with gas fuel and drilled with at least two holes aligned on the same generator, possibly fitted with injectors, and making it possible to emit jets of combustible gas directed downstream; a flame stabilizer formed by two divergent wings forming a deflector on the part and on the other side of said generator, is fixed on said tube and deflects the flow of oxidant gas to create downstream of the burner bank a protected area where the flame can develop.

Selon l'invention au moins un desdits trous est prolongé par une tubulure s'étendant au-delà des bords extérieurs des ailes et percée d'au moins un orifice d'éjection du gaz combustible à son extrémité distale.According to the invention at least one of said holes is extended by tubing extending beyond the edges wings and pierced by at least one opening fuel gas ejection at its distal end.

Une telle tubulure injecte ainsi une partie du gaz combustible à par exemple au moins 100 mm en aval des autres orifices ne portant pas de tubulure, permettant l'étagement de l'injection de ce gaz et des flammes de combustion obtenues, et donc la réduction du pourcentage d'oxydes d'azote NOx produit : en effet, la flamme principale ainsi obtenue par cette injection étagée, et qui est donc plus éloignée du stabilisateur déflecteur, est plus aérée ; la combustion se produit à plus fort excès d'air donc à température plus basse, ce qui produit une forte réduction de la formation des oxydes d'azote d'origine essentiellement thermique, et plus l'étagement est important, plus les oxydes d'azote sont réduits.Such tubing thus injects part of the combustible gas at for example at least 100 mm downstream other orifices not carrying tubing, allowing the staging of the injection of this gas and of the combustion flames obtained, and therefore the reduction in percentage of nitrogen oxides NOx produced: in fact, the main flame thus obtained by this injection stepped, and which is therefore further from the stabilizer deflector, is more airy; combustion occurs at stronger excess air therefore at lower temperature, this which produces a strong reduction in the formation of nitrogen oxides of mainly thermal origin, and the higher the staging, the more nitrogen oxides are reduced.

Une telle méthode de réduction d'oxydes d'azote NOx par étalement du gaz est certes déjà enseignée dans la demande de brevet précitée EP 313 469 mais les tubulures n'y sont mentionnées qu'en option et sont situées à l'extérieur des blocs constituant le brûleur, l'extrémité de ces tubes étant située approximativement dans le même plan que le bord avant des ailes du stabilisateur et à l'extérieur de celui-ci.Such a method of reducing nitrogen oxides NOx by spreading gas is certainly already taught in the aforementioned patent application EP 313 469 but the tubing are only mentioned there as an option and are located outside the blocks constituting the burner, the end of these tubes being located approximately in the same plane as the front edge of the wings of the stabilizer and outside of it.

L'inconvénient majeur de cette disposition est une formation importante d'oxyde de carbone CO bien supérieure à la limite admise par l'arrêté rappelé ci-dessus. Cette formation est due à la trop grande distance entre la flamme qui se développe à l'abri des ailes du stabilisateur et de l'injection de gaz secondaires dont une partie fortement diluée par l'air ne brûle pas ou de façon incomplète.The major disadvantage of this arrangement is significant formation of carbon monoxide CO well higher than the limit allowed by the decree mentioned above. This training is due to the too large distance between the flame which develops away from stabilizer and gas injection wings secondary of which a part strongly diluted by the air does not burn or is incomplete.

La présente invention permet entre autres de remédier à ce défaut : le principe de réduction des NOx est toujours l'étalement du gaz mais cet étagement est réalisé de façon axiale au lieu de radiale. Pour éviter la formation de CO il suffit de conserver par les orifices classiques sans tubulure un débit suffisant (moins de 30% du débit global de gaz combustible) pour créer une flamme pilote assurant l'allumage et la stabilité de la flamme principale provenant de l'injection étagée.The present invention makes it possible inter alia to remedy this defect: the NOx reduction principle is always the spreading of the gas but this staging is performed axially instead of radial. To avoid CO formation just keep by conventional orifices without tubing sufficient flow (less than 30% of the overall fuel gas flow) for create a pilot flame ensuring ignition and stability of the main flame from staged injection.

Dans un mode préférentiel de réalisation pour améliorer l'aération de la flamme principale étagée, l'extrémité distale de la tubulure comporte au moins quatre orifices d'éjection différents et le gaz peut alors être éjecté par ces divers trous d'angles différents au lieu d'un seul trou dans l'axe du tube. Dans l'exemple de réalisation représenté et décrit dans les figures jointes, les axes d'éjection des orifices sont inclinés deux par deux d'une part d'un angle β de 20 à 50° de part et d'autre du plan défini par la génératrice d'alignement des trous et l'axe du tube et d'autre part d'un angle α de 10 à 30° de part et d'autre du plan perpendiculaire au précédent et passant par le trou prolongé par ladite tubulure. Ces angles α et β sont importants pour la qualité des résultats et doivent être déterminés en fonction des dimensions du brûleur et du foyer sur lequel celui-ci est monté.In a preferred embodiment for improve the ventilation of the storied main flame, the distal end of the tubing has at least four different ejection ports and the gas can then be ejected through these various corner holes different instead of a single hole in the axis of the tube. In the embodiment shown and described in the attached figures, the axes of ejection of the orifices are inclined two by two on the one hand by an angle β of 20 to 50 ° on either side of the plane defined by the generator of alignment of the holes and the axis of the tube and on the other hand with an angle α of 10 to 30 ° on both sides from the plane perpendicular to the previous one and passing through the hole extended by said tubing. These angles α and β are important for the quality of the results and should be determined according to the dimensions of the burner and the fireplace on which it is mounted.

De plus, afin de pouvoir augmenter encore cet effet d'étagement en réduisant le débit primaire, il est possible de conserver la stabilité de la flamme principale, dite secondaire, car elle réalise l'étagement du gaz combustible, avec seulement 10% du gaz dans les orifices primaires ne comportant donc pas de tubulure ; pour cela on peut selon l'invention :

  • introduire une partie du comburant à la racine de la flamme secondaire; ce dispositif a pour avantage, en plus de l'augmentation de la stabilité de la flamme lors du fonctionnement en gaz de turbine, de permettre une réduction de l'oxyde d'azote NO contenu dans ce gaz par effet dit de "reburning" (le NO est en effet transformé en N2 par réduction chimique venant des radicaux CH+ présents dans la racine de la flamme) ;
  • rajouter au moins un obstacle disposé en face d'au moins un jet de gaz éjecté par un de ces trous non prolongés par une tubulure, ce qui favorise leur éclatement et élargit la flamme pilote dite également primaire pour y conférer une meilleure efficacité. Différentes formes peuvent être données à cet obstacle telles que préférentiellement cylindrique mais d'autres formes peuvent être utilisées avec un effet similaire.Les autres caractéristiques des brûleurs ou rampes décrites dans le brevet précité EP 313 469 peuvent être également combinées avec celles décrites ci-dessus et ci-dessous de la présente invention pour obtenir un brûleur assurant également un taux d'aération pratiquement constant du mélange air combustible en dépit des variations du débit de combustible et/ou de la vitesse du gaz à réchauffer. De telles caractéristiques additionnelles sont décrites ci-après et représentées sur certaines figures.Le résultat est de nouveaux brûleurs à gaz pour le chauffage d'un gaz circulant dans un conduit et qui comportent des perfectionnements aux brûleurs connus actuels car répondant au problème posé, qui est de respecter les valeurs réglementaires d'émission d'oxydes d'azote NOx et d'oxydes de carbone CO tout en assurant une bonne stabilité de flamme et un taux d'aération pratiquement constant du mélange air combustible quelles que soient les variations du débit de combustible et/ou de la vitesse du gaz à réchauffer.De tels résultats montrent la nouveauté et l'intérêt de la présente invention sans qu'il soit nécessaire d'en citer d'autres avantages. La description et les dessins ci-joints représentent des exemples de réalisation de l'invention n'ayant aucun caractère limitatif : d'autres réalisations sont possibles dans le cadre de la portée et de l'étendue de cette invention, en particulier en changeant la forme du tube d'alimentation du combustible ainsi que celle du déflecteur stabilisateur ainsi, le nombre d'orifices ou trous d'injection du combustible qui peuvent être par exemple compris entre 2 et 10.
  • la figure 1 est une vue en coupe d'un exemple de réalisation d'un brûleur selon l'invention perpendiculairement à l'axe de son tube d'alimentation en gaz combustible ;
  • la figure 2 est une vue en coupe suivant II-II' de la figure 3 d'un autre exemple de réalisation d'un brûleur suivant l'invention ;
  • la figure 3 est une vue frontale, face à l'écoulement du gaz à chauffer, du brûleur représenté sur la figure 2 ;
  • la figure 4 est une vue en coupe suivant IV-IV' de la figure 3 d'un exemple de réalisation d'un brûleur suivant l'invention;
  • la figure 5 est une vue en coupe suivant II, II' de la figure 3 d'un autre exemple de réalisation, que celui des figures 1 et 2, d'un brûleur suivant l'invention.
In addition, in order to be able to further increase this staging effect by reducing the primary flow, it is possible to maintain the stability of the main flame, known as the secondary flame, since it achieves the staging of the combustible gas, with only 10% of the gas. in the primary orifices therefore having no tubing; for this it is possible according to the invention:
  • introduce part of the oxidizer at the root of the secondary flame; this device has the advantage, in addition to increasing the stability of the flame during operation in turbine gas, to allow a reduction of the nitrogen oxide NO contained in this gas by the so-called "reburning" effect ( NO is in fact transformed into N2 by chemical reduction coming from the CH + radicals present in the root of the flame);
  • add at least one obstacle arranged opposite at least one gas jet ejected by one of these holes not extended by a tube, which promotes their bursting and widens the pilot flame also called primary to give it better efficiency. Different shapes can be given to this obstacle, such as preferably cylindrical, but other shapes can be used with a similar effect. The other characteristics of the burners or burners described in the aforementioned patent EP 313 469 can also be combined with those described above. and below of the present invention to obtain a burner also ensuring a practically constant aeration rate of the fuel air mixture despite variations in the fuel flow rate and / or the speed of the gas to be heated. Such additional characteristics are described below and shown in certain figures. The result is new gas burners for heating a gas circulating in a duct and which include improvements to the current known burners because they respond to the problem posed, which is to respect the regulatory emission values of nitrogen oxides NOx and carbon oxides CO while ensuring good flame stability and a practically constant aeration rate of the combustible air mixture whatever the variations in the flow fuel and / or the speed of the gas to be heated. Such results show the novelty and the advantage of the present invention without it being necessary to cite other advantages. The description and the attached drawings represent examples of embodiment of the invention which have no limiting character: other embodiments are possible within the scope and scope of this invention, in particular by changing the shape of the fuel supply tube as well as that of the stabilizing deflector, as well as the number of fuel injection orifices or holes which may for example be between 2 and 10.
  • Figure 1 is a sectional view of an exemplary embodiment of a burner according to the invention perpendicular to the axis of its fuel gas supply tube;
  • Figure 2 is a sectional view along line II-II 'of Figure 3 of another embodiment of a burner according to the invention;
  • Figure 3 is a front view, facing the flow of gas to be heated, of the burner shown in Figure 2;
  • Figure 4 is a sectional view along line IV-IV 'of Figure 3 of an embodiment of a burner according to the invention;
  • Figure 5 is a sectional view along II, II 'of Figure 3 of another embodiment, than that of Figures 1 and 2, of a burner according to the invention.

Celle-ci concerne un type de brûleur destiné à être placé dans un conduit pour chauffer un gaz circulant dans ce conduit et qui comporte un tube 1 d'axe XX' apte à être disposé transversalement par rapport à la direction A de circulation desdits gaz ; ledit tube peut être de section circulaire de diamètre D, tel que représenté sur la figure 2 mais également de section quelconque telle que par exemple celle de la figure 1, et peut porter différents blocs brûleurs disposés côte à côte pour constituer une rampe. This concerns a type of burner intended for be placed in a duct to heat a gas circulating in this conduit and which comprises a tube 1 of axis XX 'able to be arranged transversely by relative to the direction A of circulation of said gases; said tube may be of circular cross section of diameter D, as shown in Figure 2 but also of any section such as for example that of the Figure 1, and can carry different burner blocks arranged side by side to form a ramp.

Ce tube 1 est alimenté en gaz combustible 10 et est percé d'au moins deux trous 3 par bloc brûleur, alignés sur une même génératrice 18 parallèle donc à l'axe XX' du tube ; un stabilisateur de flamme 2 formé par deux ailes 12 divergentes formant déflecteurs de part et d'autre de ladite génératrice 18 est fixé sur ledit tube 1.This tube 1 is supplied with combustible gas 10 and is drilled with at least two holes 3 per burner block, aligned on the same generator 18 parallel therefore to the axis XX 'of the tube; a flame stabilizer 2 formed by two diverging wings 12 forming deflectors of on either side of said generator 18 is fixed on said tube 1.

Selon les modes de représentation des figures 2 à 5, ledit stabilisateur déflecteur 2 peut comporter des parois 131, 132 formant nervures de renforcement aux extrémités, suivant la direction d'axe XX', des ailes 12 de chaque bloc brûleur, ainsi que des nervures 141, 142 intermédiaires quand le bloc brûleur comporte plusieurs trous 3 et nécessite donc un renforcement intermédiaire des ailes 2 ; celles-ci peuvent comporter une cassure 22, vers leurs bords extérieurs 17 aval par rapport à la direction A de circulation des gaz comburants, pour raidir ceux-ci et améliorer l'aérodynamisme du bloc brûleur.According to the modes of representation of FIGS. 2 to 5, said deflector stabilizer 2 may include walls 13 1 , 13 2 forming reinforcement ribs at the ends, in the direction of axis XX ′, of the wings 12 of each burner block, as well as ribs 14 1 , 14 2 intermediate when the burner block has several holes 3 and therefore requires an intermediate reinforcement of the wings 2; these may include a break 22, towards their outer edges 17 downstream relative to the direction A of circulation of the oxidizing gases, to stiffen the latter and improve the aerodynamics of the burner block.

Selon l'invention, au moins un desdits trous 3 est prolongé par une tubulure 11 s'étendant au-delà des bords extérieurs 17 des ailes 12 et percé d'au moins un orifice 9 d'éjection du gaz 10 combustible à son extrémité distale.According to the invention, at least one of said holes 3 is extended by a tube 11 extending beyond the outer edges 17 of the wings 12 and pierced with at least one 9 gas ejection port 10 fuel to sound distal end.

Ainsi, comme représenté sur la figure 1, au moins un orifice dit classique 3 ne comportant pas de tubulure permet d'obtenir une flamme dite pilote ou primaire 19 assurant l'allumage et la stabilité d'au moins une flamme principale dite secondaire 20 provenant de l'injection étagée.Thus, as shown in Figure 1, at minus a so-called classic orifice 3 having no tubing makes it possible to obtain a so-called pilot flame or primary 19 ensuring ignition and stability of minus a main flame called secondary 20 coming from of the staged injection.

Comme l'on peut conserver la stabilité de cette flamme secondaire 20 avec seulement 10% du gaz combustible dans les orifices primaires 3, grâce à des dispositifs tels que décrits ci-après, le système de pré-mélange par système Venturi utilisant une tuyère convergente divergente 8 telle que représentée sur la figure 2 et décrite dans la demande de brevet EP 313 469 n'est pas indispensable au bon fonctionnement du brûleur: la présente invention s'applique ainsi à tous types de brûleurs «en veine» comportant un stabilisateur déflecteur, mais incluant ou non un tel dispositif Venturi.As we can keep the stability of this secondary flame 20 with only 10% of the gas fuel in the primary orifices 3, thanks to devices as described below, the premix by Venturi system using a nozzle converging diverging 8 as shown in the Figure 2 and described in patent application EP 313 469 is not essential for the proper functioning of the burner: the present invention thus applies to all types of “vein” burners with stabilizer deflector, but including or not including such a device Venturi.

De préférence l'extrémité distale de la tubulure 11 comporte plusieurs orifices 9 d'éjection divergents dont les axes d'éjection sont inclinés d'un angle β par rapport au plan AA' défini par la génératrice 18 d'alignement des trous 3 et l'axe XX' du tube 1, et d'un angle α par rapport au plan BB' perpendiculaire au précédent et passant par le trou 3 prolongé par ladite tubulure 11.Preferably the distal end of the tubing 11 has several divergent ejection orifices 9 whose ejection axes are inclined by an angle β by relation to plan AA 'defined by the generator 18 of alignment of the holes 3 and the axis XX 'of the tube 1, and of a angle α with respect to the plane BB 'perpendicular to the previous and passing through hole 3 extended by said tubing 11.

Le nombre d'orifices, leur angle d'éjection α et β et leur diamètre de passage sont fonction de la vitesse du comburant et des dimensions du conduit dans lequel on dispose le brûleur, (et donc de la distance entre les rampes qui le composent), afin de pouvoir adapter et optimiser la pénétration des jets de combustible dans la veine du comburant. Pour cela ladite extrémité distale 25 de la tubulure 11 peut être interchangeable et fixée par un système de filetage ou autres.The number of orifices, their ejection angle α and β and their passage diameter are a function of the oxidizer speed and duct dimensions in which one has the burner, (and therefore the distance between the ramps that compose it), in order to be able adapt and optimize the penetration of the fuel in the oxidizer vein. For that said distal end 25 of tubing 11 may be interchangeable and fixed by a threading system or other.

Dans le cas de quatre orifices 9 d'éjection par exemple, leurs axes peuvent être inclinés deux à deux, d'un angle β de 20 à 50° de part et d'autre du plan AA' et d'un angle α de 10 à 30° de part et d'autre du plan BB'.In the case of four ejection orifices 9 per example, their axes can be tilted two by two, with an angle β of 20 to 50 ° on either side of the plane AA ' and at an angle α of 10 to 30 ° on either side of the plane BB '.

Pour obtenir la stabilité de la flamme principale, dite secondaire 20, avec seulement 10% du gaz combustible dans les orifices primaires 3 et éviter la formation de CO lors du fonctionnement en gaz turbine, le brûleur suivant l'invention comporte :

  • éventuellement un obstacle 15 disposé en face d'un desdits trous 3 non prolongé par la tubulure 11 afin de favoriser l'éclatement des jets d'éjection de gaz combustible et élargir ainsi la flamme primaire pour lui conférer une meilleure efficacité;
  • des ouvertures 21 au-delà des bords extérieurs 17 des ailes tels que définis précédemment et prolongés par des ailerons ou déflecteurs complémentaires 24, et réalisés dans ces dits ailerons 24 à un niveau intermédiaire par rapport à l'extrémité 23 aval de ceux-ci par rapport à la direction A de circulation des gaz comburants ; ces ouvertures 21 permettent le passage d'une partie de ce gaz comburant qui est alors introduit à la racine de la flamme secondaire 20, assurant une alimentation plus progressive de celles-ci, et permet une réduction du NO contenu dans ce gaz comburant.
To obtain the stability of the main, so-called secondary flame 20, with only 10% of the combustible gas in the primary orifices 3 and to avoid the formation of CO during operation in turbine gas, the burner according to the invention comprises:
  • possibly an obstacle 15 disposed opposite one of said holes 3 not extended by the pipe 11 in order to promote the bursting of the fuel gas ejection jets and thus widen the primary flame to give it better efficiency;
  • openings 21 beyond the outer edges 17 of the wings as defined above and extended by ailerons or complementary deflectors 24, and produced in these said fins 24 at an intermediate level relative to the downstream end 23 thereof by relation to direction A of circulation of oxidizing gases; these openings 21 allow the passage of a portion of this oxidizing gas which is then introduced at the root of the secondary flame 20, ensuring a more gradual supply thereof, and allows a reduction of the NO contained in this oxidizing gas.

Suivant le mode de réalisation de la figure 5 un bloc brûleur tel que celui représenté sur la figure 2 peut être modifié facilement par rajout de pièces complémentaires correspondant à ces ailerons 24 et disposées au-delà de la cassure 22 des ailes 12 correspondant aux bords 17 : la position et les dimensions de ces ailerons 24 ayant un effet important sur les résultats, il est intéressant d'avoir la possibilité de les changer en cas de nécessité grâce à leur réalisation par pièce rajoutée.According to the embodiment of Figure 5 a burner block such as that shown in Figure 2 can be easily modified by adding parts complementary corresponding to these fins 24 and arranged beyond the break 22 of the wings 12 corresponding to edges 17: the position and dimensions of these fins 24 having a significant effect on the results it is interesting to have the possibility to change them if necessary thanks to their realization by added piece.

Tel que représenté sur les figures 2 à 4, l'obstacle 15 éventuellement disposé en face d'un des dits trous 3 non prolongé par la tubulure 11 peut être porté, par un collier ou couronne de fixation 16, sur la tubulure 11 pour ce qui concerne les trous ou orifices 3 d'éjection placés de part et d'autre de celle-ci. Ledit obstacle 15 est par exemple cylindrique et son axe est perpendiculaire à celui du trou 3 en face duquel il est disposé.As shown in Figures 2 to 4, the obstacle 15 possibly placed opposite one of the said holes 3 not extended by the tubing 11 can be worn, by a collar or fixing crown 16, on the tubing 11 with regard to the holes or orifices 3 ejection placed on either side of it. Said obstacle 15 is for example cylindrical and its axis is perpendicular to that of hole 3 opposite which it is willing.

Dans un type de bloc brûleur donné, celui-ci peut comporter au moins trois trous 3 dont l'un d'entre eux 3' est associé à la tubulure 11, l'obstacle 15 à un autre trou 3' adjacent à celui associé à la tubulure 11 et le dernier trou étant libre.In a given type of burner block, this one may have at least three holes 3, one of which them 3 'is associated with the pipe 11, the obstacle 15 to a another hole 3 'adjacent to that associated with the tubing 11 and the last hole is free.

Un bloc brûleur peut avoir un nombre de trous en fait quelconque, compris par exemple entre deux et dix et la tubulure 11 peut être disposée de façon régulière par exemple dans un trou sur deux, un trou sur trois ou un trou sur quatre, etc...A burner block can have a number of holes in any fact, for example between two and ten and the tubing 11 can be arranged in a regular manner for example in every second hole, every third hole or one hole in four, etc ...

Dans le mode de réalisation représenté sur la figure 4, à titre d'exemple, le bloc brûleur suivant l'invention comprend cinq trous 3 dans lequel la tubulure 11 est associée au trou central, les deux trous adjacents à celui-ci étant associés à un obstacle 15 et les deux trous d'extrémité étant libres.In the embodiment shown in the Figure 4, by way of example, the following burner block the invention comprises five holes 3 in which the tubing 11 is associated with the central hole, the two holes adjacent to it being associated with an obstacle 15 and the two end holes being free.

De tels brûleurs suivant l'invention peuvent également comporter des éléments caractéristiques des brûleurs, tels que décrits dans le brevet EP 313 469, et tels qu'en particulier, devant au moins un trou 32 non prolongé par une tubulure 11 et coaxialement à celui-ci, une tuyère convergente divergente 8 apte à ce que le jet de gaz éjecté par ledit trou 32 crée une dépression à l'entrée de la tuyère 8, telle que représentée sur la figure 4. Ladite entrée communique avec la face extérieure ou extra-dos d'au moins une des ailes 12 du stabilisateur 2 par au moins une ouverture 7.Such burners according to the invention may also include elements characteristic of the burners, as described in patent EP 313 469, and such as in particular, in front of at least one hole 3 2 not extended by a pipe 11 and coaxial with that here, a diverging convergent nozzle 8 capable of causing the jet of gas ejected through said hole 3 2 to create a vacuum at the inlet of the nozzle 8, as shown in FIG. 4. Said inlet communicates with the outer face or extra back of at least one of the wings 12 of the stabilizer 2 through at least one opening 7.

L'espace entre les tuyères 8 et le tube 1 est fermé par deux éléments de paroi 4 fixés sur le tube et disposés quasi parallèles au plan défini par la génératrice 18 d'alignement des trous 3 et l'axe XX' du tube 1 et par une paroi frontale 5 raccordée auxdits éléments de paroi 4 et portant les tuyères ; les ouvertures 7 sont percées dans lesdits éléments de paroi 4.The space between the nozzles 8 and the tube 1 is closed by two wall elements 4 fixed on the tube and arranged almost parallel to the plane defined by the generator 18 for aligning the holes 3 and the axis XX 'of the tube 1 and by a front wall 5 connected to said wall elements 4 and carrying the nozzles; the openings 7 are drilled in said wall elements 4.

A titre d'exemples de réalisation on peut donner quelques indications de dimensions d'un bloc brûleur suivant l'invention dans lequel la longueur L11 de la tubulure 11 au-delà de l'orifice 3 auquel elle est associée est de l'ordre de 100 à 200 mm avec une longueur L au-delà de la sortie des tuyères 8, de 40 à 150 mm environ et de préférence entre 50 et 80 mm pour un diamètre d11 de 12 à 20 mm. L'obstacle 15 peut être un tube cylindrique de diamètre d15 de 10 mm environ et disposé à une distance a de l'ordre de 25 mm de la sortie des tuyères 8 ; la longueur L15 de tels obstacles fixés sur la tubulure 11 peut être de l'ordre de 85 à 90 mm suivant la distance séparant deux trous ou orifices 3 adjacents ; le diamètre D1 du tube d'alimentation en combustible est de l'ordre de 85 à 90 mm.As examples of embodiment, one can give some indications of dimensions of a burner block according to the invention in which the length L 11 of the pipe 11 beyond the orifice 3 with which it is associated is of the order from 100 to 200 mm with a length L beyond the outlet of the nozzles 8, from 40 to 150 mm approximately and preferably between 50 and 80 mm for a diameter d 11 from 12 to 20 mm. The obstacle 15 may be a cylindrical tube with a diameter d 15 of approximately 10 mm and placed at a distance a of the order of 25 mm from the outlet of the nozzles 8; the length L 15 of such obstacles fixed on the tube 11 can be of the order of 85 to 90 mm depending on the distance separating two adjacent holes or orifices 3; the diameter D 1 of the fuel supply tube is of the order of 85 to 90 mm.

Claims (12)

Brûleur destiné à être placé dans un conduit pour chauffer un gaz circulant dans ce conduit, et comportant un tube (1) d'axe XX' apte à être disposé transversalement par rapport à la direction A de circulation dudit gaz, alimenté en gaz combustible (10) et percé d'au moins deux trous (3) alignés sur une même génératrice (18), et un stabilisateur de flamme (2) formé par deux ailes (12) divergentes formant déflecteur de part et d'autre de ladite génératrice (18),
caractérisé en ce qu'au moins un desdits trous (3) est prolongé par une tubulure (11) s'étendant au-delà des bords extérieurs (17) des ailes (12) et percée d'au moins un orifice (9) d'éjection du gaz (10) combustible à son extrémité distale.
Burner intended to be placed in a conduit for heating a gas circulating in this conduit, and comprising a tube (1) of axis XX 'capable of being arranged transversely with respect to the direction A of circulation of said gas, supplied with combustible gas ( 10) and pierced with at least two holes (3) aligned on the same generator (18), and a flame stabilizer (2) formed by two diverging wings (12) forming a deflector on either side of said generator ( 18),
characterized in that at least one of said holes (3) is extended by a tube (11) extending beyond the outer edges (17) of the wings (12) and pierced with at least one orifice (9) d ejection of the combustible gas (10) at its distal end.
Brûleur selon la revendication 1, caractérisé en ce que l'extrémité distale (25) de la tubulure (11) peut être interchangeable.Burner according to claim 1, characterized in that the distal end (25) of the tubing (11) can be interchangeable. Brûleur selon l'une des revendications 1 ou 2, caractérisé en ce que l'extrémité distale de la tubulure (11) comporte plusieurs orifices (9) d'éjection divergents.Burner according to one of claims 1 or 2, characterized in that the distal end of the tubing (11) has several ejection orifices (9) divergent. Brûleur selon la revendication 3, caractérisé en ce que l'extrémité distale (25) comporte au moins quatre orifices (9) d'éjection dont les axes sont inclinés d'un angle β de 20 à 50° de part et d'autre du plan défini par la génératrice (18) d'alignement des trous (3) et l'axe XX' du tube (1), et d'un angle α de 10 à 30° de part et d'autre du plan perpendiculaire au précédent et passant par le trou (3) prolongé par ladite tubulure (11). Burner according to claim 3, characterized in that the distal end (25) has at least four ejection orifices (9) whose axes are inclined at an angle β from 20 to 50 ° on either side of the plane defined by the generator (18) for aligning the holes (3) and the axis XX 'of the tube (1), and at an angle α of 10 to 30 ° on either side of the plane perpendicular to the preceding and passing through the hole (3) extended by said tubing (11). Brûleur selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comporte au moins un obstacle (15) disposé en face d'un des trous (3) non prolongé par la tubulure (11).Burner according to any one of Claims 1 to 4, characterized in that it comprises at least one obstacle (15) arranged opposite one of the holes (3) not extended by the tubing (11). Brûleur selon la revendication 5, caractérisé en ce que ledit obstacle (15) est porté par la tubulure (11).Burner according to claim 5, characterized in that said obstacle (15) is carried by the tubing (11). Brûleur selon l'une quelconque des revendications 5 ou 6, caractérisé en ce que ledit obstacle (15) est cylindrique et son axe est perpendiculaire à celui du trou (3) en face duquel il est disposé.Burner according to any one of claims 5 or 6, characterized in that said obstacle (15) is cylindrical and its axis is perpendicular to that of the hole (3) opposite which it is willing. Brûleur selon l'une quelconque des revendications 5 à 7 et comprenant au moins trois trous (3) caractérisé en ce que la tubulure (11) est associé à un des trous (31) et l'obstacle (15) à un trou (32) adjacent à celui associé à la tubulure (11), le dernier trou étant libre.Burner according to any one of Claims 5 to 7 and comprising at least three holes (3) characterized in that the tube (11) is associated with one of the holes (3 1 ) and the obstacle (15) with a hole ( 3 2 ) adjacent to that associated with the tubing (11), the last hole being free. Brûleur selon l'une quelconque des revendications 5 à 8, et comprenant cinq trous (3) caractérisé en ce que la tubulure (11) est associée au trou central, les deux trous adjacents à celui-ci étant associés à un obstacle (15) et les deux trous d'extrémité étant libres.Burner according to any one of claims 5 to 8, and comprising five holes (3) characterized in that the tubing (11) is associated with the central hole, the two holes adjacent to it being associated with an obstacle (15) and the two holes end being free. Brûleur selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'il comporte des ailerons complémentaires (24) prolongeant les bords extérieurs (17) des ailes et des ouvertures (21) réalisées dans ces ailerons (24) et aptes à laisser passer une partie du gaz circulant dans le conduit et l'introduire vers la racine de la flamme dudit brûleur.Burner according to any one of Claims 1 to 9, characterized in that it comprises complementary fins (24) extending the edges outer (17) wings and openings (21) made in these fins (24) and suitable for leaving pass some of the gas flowing in the conduit and introduce it towards the root of the flame of said burner. Brûleur selon l'une quelconque des revendications 1 à 10, caractérisé en ce qu'il comporte, devant au moins un trou (32) non prolongé par une tubulure (11) et coaxialement à celui-ci, une tuyère convergente-divergente (8) apte à ce que le jet de gaz éjecté par ledit trou (32) crée une dépression à l'entrée de la tuyère (8), ladite entrée communiquant avec la face extérieure d'au moins une des ailes (12) du stabilisateur (2) par au moins une ouverture (7).Burner according to any one of claims 1 to 10, characterized in that it comprises, in front of at least one hole (3 2 ) not extended by a tube (11) and coaxially with it, a convergent-diverging nozzle ( 8) suitable for the gas jet ejected through said hole (3 2 ) to create a vacuum at the inlet of the nozzle (8), said inlet communicating with the outer face of at least one of the wings (12) of the stabilizer (2) by at least one opening (7). Brûleur selon la revendication 11, caractérisé en ce que l'espace entre les tuyères (8) et le tube (1) est fermé par deux éléments de paroi (4), fixés sur le tube et disposés quasi parallèles au plan défini par la génératrice (18) d'alignement des trous (3) et l'axe XX' du tube (1), et par une paroi frontale (5) raccordée auxdits éléments de paroi (4) et portant les tuyères (8), et en ce que les ouvertures (7) sont percées dans lesdits éléments de paroi (4).Burner according to claim 11, characterized in that the space between the nozzles (8) and the tube (1) is closed by two wall elements (4), fixed on the tube and arranged almost parallel to the plane defined by the generator (18) for aligning the holes (3) and the axis XX 'of the tube (1), and by a front wall (5) connected to said wall elements (4) and carrying the nozzles (8), and in that the openings (7) are drilled in said wall elements (4).
EP00403424A 2000-02-04 2000-12-06 Gas burners for heating a gas flowing in a duct Expired - Lifetime EP1122494B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0001455A FR2804748B1 (en) 2000-02-04 2000-02-04 IMPROVEMENT WITH GAS BURNERS FOR HEATING A GAS FLOWING IN A CONDUIT
FR0001455 2000-02-04

Publications (2)

Publication Number Publication Date
EP1122494A1 true EP1122494A1 (en) 2001-08-08
EP1122494B1 EP1122494B1 (en) 2004-04-14

Family

ID=8846686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00403424A Expired - Lifetime EP1122494B1 (en) 2000-02-04 2000-12-06 Gas burners for heating a gas flowing in a duct

Country Status (5)

Country Link
US (1) US6409502B2 (en)
EP (1) EP1122494B1 (en)
DE (1) DE60009854D1 (en)
ES (1) ES2219282T3 (en)
FR (1) FR2804748B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045523A1 (en) 2007-10-02 2009-04-08 Ansaldo Caldaie S.p.A. Post-firing burner for natural gas and lean gases with a high efficiency and a low emission of nitrogen oxides

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6929470B1 (en) * 2002-10-30 2005-08-16 Coen Company, Inc. Low NOx duct burner
EP2085695A1 (en) * 2008-01-29 2009-08-05 Siemens Aktiengesellschaft Fuel nozzle with swirl duct and method for manufacturing a fuel nozzle
EP2218965A1 (en) * 2009-02-16 2010-08-18 Total Petrochemicals Research Feluy Low NOx burner
JP6018714B2 (en) * 2012-11-21 2016-11-02 ゼネラル・エレクトリック・カンパニイ Anti-coking liquid fuel cartridge
BE1024480B1 (en) * 2016-08-08 2018-03-09 Agrofrost, Naamloze Vennootschap Gas burner for strong air flow

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649211A (en) * 1970-02-05 1972-03-14 Coen Co Air augmented duct burner
JPS62123208A (en) * 1985-11-21 1987-06-04 Hitachi Zosen Corp Low NOx duct burner for reheating
EP0313469A1 (en) * 1987-10-23 1989-04-26 Mecanique Generale Foyers-Turbine Gas burner for heating an air stream or other oxidant gas
DE3830038A1 (en) * 1988-09-03 1990-03-08 Gaswaerme Inst Ev Burner and method for its operation
EP0654637A1 (en) * 1993-11-19 1995-05-24 GIERSCH GmbH Gas burner

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494712A (en) * 1968-07-01 1970-02-10 Coen Co Duct burner
US3843309A (en) * 1973-03-07 1974-10-22 Gen Electric Liquid fuel grid burner for vitiated air using auxiliary combustion air
US4375952A (en) * 1979-09-07 1983-03-08 Coen Company, Inc. Wall fired duct heater
US4523905A (en) * 1983-07-21 1985-06-18 Nu-Way Energy Limited Burner for gaseous fuels
US4767319A (en) * 1987-03-27 1988-08-30 Coen Company Duct burner

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649211A (en) * 1970-02-05 1972-03-14 Coen Co Air augmented duct burner
JPS62123208A (en) * 1985-11-21 1987-06-04 Hitachi Zosen Corp Low NOx duct burner for reheating
EP0313469A1 (en) * 1987-10-23 1989-04-26 Mecanique Generale Foyers-Turbine Gas burner for heating an air stream or other oxidant gas
DE3830038A1 (en) * 1988-09-03 1990-03-08 Gaswaerme Inst Ev Burner and method for its operation
EP0654637A1 (en) * 1993-11-19 1995-05-24 GIERSCH GmbH Gas burner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 344 (M - 640) 11 November 1987 (1987-11-11) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045523A1 (en) 2007-10-02 2009-04-08 Ansaldo Caldaie S.p.A. Post-firing burner for natural gas and lean gases with a high efficiency and a low emission of nitrogen oxides

Also Published As

Publication number Publication date
FR2804748A1 (en) 2001-08-10
DE60009854D1 (en) 2004-05-19
FR2804748B1 (en) 2002-04-12
EP1122494B1 (en) 2004-04-14
ES2219282T3 (en) 2004-12-01
US6409502B2 (en) 2002-06-25
US20010012603A1 (en) 2001-08-09

Similar Documents

Publication Publication Date Title
EP0675321B1 (en) Gas burners with very low nitrogen oxide emissions
EP1907754B1 (en) Method and installation for unsupported lean fuel gas combustion, using a burner and related burner
CA2582634C (en) Configuration of dilution inlets in a turbine engine combustion chamber wall
EP0984223B1 (en) Combustion process for burning a fuel
FR2925657A1 (en) DEVICE AND METHOD FOR STABILIZING THE PRESSURE AND FLOW OF A GAS MIXTURE SUPPLYING A SURFACE COMBUSTION CYLINDRICAL BURNER
EP1122494B1 (en) Gas burners for heating a gas flowing in a duct
FR2706985A1 (en)
EP1074790B1 (en) Burner with exhaust recirculation
EP0313469B1 (en) Gas burner for heating an air stream or other oxidant gas
EP3105506B1 (en) In-stream burner module
EP0926434A1 (en) Burner with low nitrogen oxide emission using recycled gas feed
FR2909437A1 (en) Rectilinear radial flame-holder device i.e. flame-holder arm for turbojet engine, has shell/cover and fuel injecting tube extended in gutter, where device is arranged such that fuel is injected in gas stream through wall of gutter
EP3234462B1 (en) Device for combustion provided with a so-called cool-wall combustion chamber, boiler and furnace comprising such a device
FR2766557A1 (en) LIQUID AND GASEOUS FUEL BURNERS WITH LOW EMISSION OF NITROGEN OXIDES
EP4004443A1 (en) Combustion chamber comprising secondary injection systems, and fuel supply method
FR2570473A1 (en) Improvements to gas boilers with parallel flow comprising a rose and a flame retention baffle (hub) relating to gas boilers and independent supply of combustion air
EP1980788B1 (en) Gaseous fuel burner
EP0862018B1 (en) Device for mounting a burner in a gas duct
WO2025032142A1 (en) Burner, especially for a direct-flame preheating section of a continuous metal-strip treatment line
FR2951525A1 (en) METHOD FOR OPERATING A BOILER
EP3303232A1 (en) Sonic injection furnace
EP0162761B1 (en) Burner with vanes and a well-balanced secondary air supply
FR2782150A1 (en) IMPROVEMENTS ON LOW-EMITTING AND LOW-EMITTING NITROGEN OXIDES BURNER
CA1264437A (en) Gas burner
EP4413300A1 (en) Device for injecting dihydrogen and air

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES IT NL

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20010824

AKX Designation fees paid

Free format text: DE ES IT NL

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES IT NL

REF Corresponds to:

Ref document number: 60009854

Country of ref document: DE

Date of ref document: 20040519

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040715

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2219282

Country of ref document: ES

Kind code of ref document: T3

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20041205

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20050117

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060701

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20060701

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20071228

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081206

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20190102

Year of fee payment: 19

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20210531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191207