EP0178198A2 - Burner with a priorily mixture and an integrated pilot-flame - Google Patents

Burner with a priorily mixture and an integrated pilot-flame Download PDF

Info

Publication number
EP0178198A2
EP0178198A2 EP85401683A EP85401683A EP0178198A2 EP 0178198 A2 EP0178198 A2 EP 0178198A2 EP 85401683 A EP85401683 A EP 85401683A EP 85401683 A EP85401683 A EP 85401683A EP 0178198 A2 EP0178198 A2 EP 0178198A2
Authority
EP
European Patent Office
Prior art keywords
tube
burner
air
flame
intermediate tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85401683A
Other languages
German (de)
French (fr)
Other versions
EP0178198B1 (en
EP0178198A3 (en
Inventor
Bernard Gallet
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.)
FinaGaz SAS
Original Assignee
TotalGaz Compagnie Francaise des Gaz Liquefies SNC
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 TotalGaz Compagnie Francaise des Gaz Liquefies SNC filed Critical TotalGaz Compagnie Francaise des Gaz Liquefies SNC
Publication of EP0178198A2 publication Critical patent/EP0178198A2/en
Publication of EP0178198A3 publication Critical patent/EP0178198A3/en
Application granted granted Critical
Publication of EP0178198B1 publication Critical patent/EP0178198B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes

Definitions

  • the present invention relates to an integrated premix burner and an integrated pilot flame.
  • the object of the present invention is to remedy the drawbacks specific to each of these types of burners, while reconciling the performance of combustion, the simplicity and the low cost of construction and installation and safety of use. To this end, it offers a burner supplied with separate air and gases, with integrated partial pre-mixing, intense mixing and rapid combustion.
  • said deflection means consist of at least one diaphragm mounted in the tube external, slightly downstream of the outlet end of the intermediate tube, and by longitudinal radial fins, mounted between the intermediate tube, and the internal tube, in the vicinity of the outlet end of the latter.
  • the formation of a homogeneous premix is ensured by the gyratory movement of the air current, which movement is preserved in the intermediate tube. This current meets the substantially radial current of the gas at right angles, and therefore mixes intimately with it.
  • the premix thus formed propagates towards the outlet of the intermediate chamber in a substantially helical movement.
  • the gyratory current of the premix is transformed by the fins into a linear jet substantially coaxial with the tubes, while the gyratory current of combustion air is reduced by the diaphragm towards the axis of the burner in the form of a centripetal jet perpendicular to the jet of the premix.
  • zone where combustion takes place and which is at a very high temperature is not in contact with any component of the burner and that the use of any diaphragm, for example, has been prohibited. or any functional part downstream of the combustion zone for obvious reasons of resistance and price of materials.
  • centripetal jet of combustion air retains a gyratory movement, which in its movement causes the axial jet of premix.
  • the final mixture therefore also has a gyratory effect conducive to obtaining a "ball flame" which, as is known, has a low volume and a high combustion intensity, due to the recirculation of the burnt gases in front of the diaphragm. This, being cooled by the combustion air, heats very little and can therefore be made of ordinary steel.
  • the premix containing a small proportion of the combustion air, which has entered the intermediate tube and which has been used to entrain the gas, is outside the flammability limits.
  • the straightening effected by the fins on the gyratory flow of the premix has the effect of giving the premix jet exiting at the nose of the burner a maximum axial speed. It is understood that any risk of flashback is thus eliminated.
  • the flame obtained is very stable, without having to use, as is customary, special devices, such as a refractory pipe.
  • the burner according to the invention makes it possible to use the burner according to the invention in a combustion chamber of small volume , or without a chamber directly in the thermal enclosure to be heated.
  • the chamber can be metallic and cold, without risk of "flame tramping", or of formation of unburnt.
  • the central tube has, in the area located opposite the fins, at least one orifice, which makes it possible to divert a fraction of the premix flow rate which flows in the intermediate tube, towards the central tube, said orifice being surmounted immediately upstream by an obstacle or an annular diaphragm mounted in the central tube.
  • a low rate of premix is taken from the intermediate tube and is mixed with the combustion air which circulates in the central tube, giving a mixture at laminar speed. devoid of any turbulence.
  • the combustion air flowing in the central tube being braked by the annular diaphragm, a dead zone is created beneath the latter which contains a depression which contains the orifice. A premix flow is therefore sucked through said orifice by the vacuum.
  • This flow mixes with the air which circulates in the central tube to form a laminar mixture which gives rise to an interior flame with the principal flame which is hung behind the exit diaphragm.
  • This flame which is very stable, constitutes a true pilot ignition flame integrated in the burner.
  • This pilot is, of course, permanently operating, but a gas supply independent of the main supply is also easily achievable.
  • the great stability of the pilot flame makes it possible to install an ionization flame control device, which, as we know, only works properly if its electrode is constantly submerged in an area where combustion is particularly stable. In this case, the electrode of the flame control device is placed in the pilot flame.
  • the central tube will serve as a sighting tube, a transparent window being formed on the bottom wall of the external tube for observation by the cell.
  • the burner shown in the figures consists of three metallic tubular elements 10, 12, 14, for example of steel, mounted coaxially with respect to each other.
  • the outer tube 10 is closed at one end by a bottom wall 16 and is open at the other end. In the vicinity of said end, the outer tube 10 is provided on its inner wall with an annular diaphragm 18 intended to restrict the passage section of the tube.
  • the intermediate tube 12 has a diameter much smaller than that of the external tube so as to form with the latter an external chamber 20.
  • the internal tube 14 defines with the tube 12 an intermediate chamber 22 and internally, an internal chamber 24 .
  • the tubes 12 and 14 are practically the same length and are shorter than the portion of external tube included between the bottom wall 16 and the diaphragm 18. They are positioned inside said external tube so that the chambers 20, 22 and 24 communicate with each other at their two ends.
  • the external tube 10 has, in the vicinity of the bottom wall 16, an orifice 26, in which a supply pipe 28 is tangentially connected. in combustion air, connected to a fan.
  • the gas is brought into the intermediate chamber 22, at a pressure higher than that of the air, by means of a longitudinal rod 30, which is fitted through an orifice drilled in the bottom wall 16 and which is embedded in a notch formed at the upper end of the inner tube 14.
  • the portion of the rod which is inside the intermediate chamber 22 is provided with a plurality of orifices 32, through which the gas flows in a radial direction.
  • the intermediate tube 12 ends at its lower end with an annular diaphragm 34 extending outwards, above the diaphragm 18, so as to form with it a passage with baffle 36, of substantially radial direction.
  • the inner tube 14 is provided on the outer wall of its lower end portion, with a plurality of longitudinal fins 38, extending radially to the intermediate tube 12.
  • the inner tube is pierced with two orifices 40 distributed over a cross section of the internal tube.
  • the latter is provided on its internal wall, immediately above the orifices, 40 with an annular diaphragm 42, which extends towards the center of the internal tube so as to restrict its passage section.
  • any risk of flashback is excluded, taken that upstream of the burner nose, the premix circulating in the intermediate chamber 22 is too rich in gas to be flammable.
  • the flame obtained is particularly stable, without the need to add to the burner a special device, such as a refractory pipe.
  • a special device such as a refractory pipe.
  • the diaphragm 18 heats only very little, because it is cooled by the combustion air. This is why, and this is an important advantage of the invention, the constituent parts of the burner can be made of ordinary steel.
  • the burner may have only one combustion chamber 46 of very small volume, as shown in Figure 2, or no room at all.
  • the central tube 14 can serve as a sighting tube for a cell type flame control, not shown.
  • a transparent sight window 48 is then formed in the bottom wall 16 for observation by the cell.
  • the electrode of an ionization flame control device can be placed in the central tube. As explained above, this electrode must be placed in a zone of great flame stability so that the current which it supplies can be representative of the operating state of the burner.
  • this zone is located at 50 inside the central tube, downstream of the internal diaphragm 42. Indeed, the latter, by slowing the flow of the stream of combustion air which s flows into the internal chamber, creates a depressed dead zone under it.
  • the depression has the effect of sucking through the orifices 40 a low flow rate of premix, which meets the combustion air which flows in the central chamber to form a non-gyratory flammable mixture.
  • a very stable small central flame 52 is therefore obtained, which hooks behind the internal diaphragm 42 and which constitutes a true pilot ignition flame integrated into the burner.
  • the pilot flame can also be directly supplied with gas from the rod 30 by a conduit not shown.
  • This pilot flame can be easily ignited by a conventional high-voltage spark device, then ignites the main burner flame.
  • the intermediate tube 12 can be fixed in a coaxial position in the external tube 10 by means of bolts which pass through tabs projecting at its upper edge and, on the internal face 14, it is maintained in the centered position. , relative to the intermediate tube, by the fins 38 which bear on the latter. In addition, it is held against any axial displacement by the gas supply rod 30.
  • the burner according to the invention allows rapid, stable and complete combustion, with intense heat transfer, without any part of the burner having to withstand any particular thermal stress.

Landscapes

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

Abstract

1. A burner with integral premixing, of the type comprising three coaxial tubes, namely an outer tube (10) into which the combustive air flows, an intermediate tube (12) into which enters the combustion gas and an innermost tube (14) in which combustive air also circulates, characterised in that : air penetrates tangentially into the outer tube (10) in the vicinity of one of its ends which is closed by an end wall (16), the air being divided into three streams which respectively pass through the three tubes with a spiral movement, the gas penetrates radially into the intermediate tube (12) likewise in the vicinity of its end near to the end wall and forms with the air passing therethrough a non-inflammable premixture, the intermediate tube and the innermost tube are open at both ends and terminate at one end at a predetermined distance from the end wall, the outer tube (10) is provided, slightly downstream of the outlet end of the intermediate tube, with first deflection means (18) which can direct the outer air stream radially towards the burner axis, second deflection means (38) are provided to direct axially the premixture at its outlet from the intermediate tube so that it intersects the outer air stream practically at right angles.

Description

La présente invention concerne un brûleur à mélange préalable intégré et à flamme pilote intégrée.The present invention relates to an integrated premix burner and an integrated pilot flame.

D'unefaçon générale, on sait que, dans un brûleur, deux fluides constitués par un combustible gazeux, tel que le propane ou le butane, et par un comburant, tel que l'air, sont mélangés de manière à former un mélange combustible à haut pouvoir calorifique.In general, it is known that, in a burner, two fluids constituted by a gaseous fuel, such as propane or butane, and by an oxidizer, such as air, are mixed so as to form a combustible mixture with high calorific value.

Dans certains types de brûleurs, ces deux flui- sont mélangés totalement avant leur introduction dans le brûleur.In certain types of burners, these two fluids are mixed completely before their introduction into the burner.

De tels brûleurs procurent une combustion intense de haute qualité, mais ne sont pratiquement plus utilisés, car la réalisation du mélange combustible- comburant à l'extérieur du brûleur impose des dispositions constructives complexes et coûteuses pour conserver à l'installation une sécurité acceptable. En effet, le mélange des deux fluides dans les bonnes proportions est hautement explosif.Such burners provide high-quality intense combustion, but are practically no longer used, since the production of the fuel-oxidant mixture outside the burner requires complex and costly structural arrangements to maintain acceptable safety at the installation. Indeed, the mixture of the two fluids in the right proportions is highly explosive.

C'est pourquoi l'usage s'est répandu d'utiliser de plus en plus des brûleurs dits à mélange au nez, qui sont alimentés séparément en air et gaz dans lesquels le mélange est réalisé au mieux juste avant d'assurer la combustion.This is why it has become widespread to use more and more so-called nose-mix burners, which are supplied separately with air and gases in which the mixture is best produced just before ensuring combustion.

La simplicité de l'installation de ces brûleurs et la sécurité d'utilisation sont maximales. Toutefois; leurs performances de combustion sont moins que celles obtenues avec les brûleurs à prémélange initial.The simplicity of the installation of these burners and the safety of use are maximum. However; their combustion performance is less than that obtained with initial premix burners.

Ainsi pour certaines applications particulières, dans lesquelles une combustion complète intensive est requise, on doit faire appel à des brûleurs spéciaux, généralement à combustion chambrée, réalisés en matériaux réfractaires et dont la construction est souvent délicate et coûteuse.Thus for certain particular applications, in which intensive complete combustion is required, use must be made of special burners, generally with chambered combustion, made of refractory materials and the construction of which is often delicate and costly.

La présente invention a pour but de remédier aux inconvénients propres à chacun de ces types de brûleurs, tout en conciliant les performances de la combustion, la simplicité et le faible coût de construction et d'installation et la sécurité d'utilisation. Elle propose, à cet effet, un brûleur alimenté en air et gaz séparés, à mélange préalable partiel intégré, à mélange intense et combustion rapide.The object of the present invention is to remedy the drawbacks specific to each of these types of burners, while reconciling the performance of combustion, the simplicity and the low cost of construction and installation and safety of use. To this end, it offers a burner supplied with separate air and gases, with integrated partial pre-mixing, intense mixing and rapid combustion.

Le brûleur selon l'invention se caractérise en ce que qu'il comprend : _

  • - trois tubes coaxiaux dont le tube externe est obturé à une extrémité par une paroi de fond et dont les deux autres sont ouverts et se terminent à une extrémité à une distance prédéterminée de ladite paroi de fond, l'air comburant débouchant tangentiellement dans le tube externe au voisinage de son extrémité qui est voisine de ladite paroi de fond,tandis que le gaz débouche radialement à l'intérieur du tube intermédiaire également au voisinage de son extrémité voisine de la paroi de fond, le débit de l'air étant réglé pour qu'il se divise en trois courants de préférence hélicoïdaux, dont deux pénètrent dans le tube externe et dans le tube interne et constituent l'air de combustion et dont le troisième pénètre dans le tube intermédiaire et forme avec le gaz un prémélange non inflammable,
  • - de premiers moyens de déflexion montés dans le tube externe, légèrement en aval de l'extrémité de sortie du tube intermédiaire, de manière à rabattre le courant d'air de combustion vers l'axe de brûleur,et
  • - de seconds moyens de déflexion montés à la sortie du tube intermédiaire, pour orienter le courant de prémélange dans l'axe du brûleur, de sorte que les deux courants susmentionnés se croisent dans la zone de mélange du brûleur.
The burner according to the invention is characterized in that it comprises: _
  • - three coaxial tubes, the outer tube of which is closed at one end by a bottom wall and the other two of which are open and terminate at one end at a predetermined distance from said bottom wall, the combustion air emerging tangentially in the tube external in the vicinity of its end which is close to said bottom wall, while the gas opens radially inside the intermediate tube also in the vicinity of its end close to the bottom wall, the air flow rate being adjusted for that it is divided into three streams, preferably helical, two of which penetrate the external tube and the internal tube and constitute the combustion air and the third of which penetrates into the intermediate tube and forms with the gas a non-flammable premix,
  • first deflection means mounted in the external tube, slightly downstream from the outlet end of the intermediate tube, so as to reduce the flow of combustion air towards the burner axis, and
  • - second deflection means mounted at the outlet of the intermediate tube, for orienting the premixing current in the axis of the burner, so that the two aforementioned currents cross in the mixing zone of the burner.

Dans un mode de réalisation particulier de l'invention, lesdits moyens de déflexion sont constitués par au moins un diaphragme monté dans le tube externe, légèrement en aval de l'extrémité de sortie du tube intermédiaire, et par des ailettes radiales longitudinales, montées entre le tube intermédiaire, et le tube interne, au voisinage de l'extrémité de sortie de ces derniers.In a particular embodiment of the invention, said deflection means consist of at least one diaphragm mounted in the tube external, slightly downstream of the outlet end of the intermediate tube, and by longitudinal radial fins, mounted between the intermediate tube, and the internal tube, in the vicinity of the outlet end of the latter.

La formation d'un prémélange homogène est assurée par le mouvement giratoire du courant d'air, lequel mouvement se conserve dans le tube intermédiaire. Ce courant rencontre à angle droit le courant sensiblement radial du gaz, et se mélange donc intimement avec lui. Le prémélange ainsi formé se propage vers la sortie de la chambre intermédiaire selon un mouvement sensiblement hélicoïdal.The formation of a homogeneous premix is ensured by the gyratory movement of the air current, which movement is preserved in the intermediate tube. This current meets the substantially radial current of the gas at right angles, and therefore mixes intimately with it. The premix thus formed propagates towards the outlet of the intermediate chamber in a substantially helical movement.

Le courant giratoire du prémélange est transformé par les ailettes en un jet linéaire sensiblement coaxial aux tubes, tandis que le courant giratoire d'air de combustion, est rabattu par le diaphragme vers l'axe du brûleur sous forme d'un jet centripète perpendiculaire au jet du prémélange. Ces deux jets se mélangent donc intimement et forment un mélange combustible de parfaite homogénéité.The gyratory current of the premix is transformed by the fins into a linear jet substantially coaxial with the tubes, while the gyratory current of combustion air is reduced by the diaphragm towards the axis of the burner in the form of a centripetal jet perpendicular to the jet of the premix. These two jets therefore mix intimately and form a combustible mixture of perfect homogeneity.

L'invention se distingue des réalisations déjà connues de prémélange air/gaz par le fait que le mélange obtenu au nez du brûleur et entrant en combustion est rendu particulièrement homogène, ce qui est essentiel pour réaliser une combustion intensive sans imbrûlés, grâce à des dispositions constructives très simples. Ce mélange homogène est réalisé par la conjonction de trois moyens :

  • - un brassage efficace de l'air et du gaz dans la zone de prémélange entre les deux tubes interne et intermédiaire, favorisé essentiellement par le mouvement giratoire de l'air et la faible épaisseur de la couche d'air constituée par un anneau.
  • - unesurface de contact finale maximale entre le prémélange et l'air de combustion au nez du brft- leur puisque le prémélange sort en couche mince et en sandwich entre deux courants d'air de combustion.
  • - une interpénétration intense des jets de prémélange et d'air par courants croisés dans une section réduite constituant le nez du brûleur.
The invention differs from the already known embodiments of air / gas premix by the fact that the mixture obtained at the nose of the burner and entering into combustion is made particularly homogeneous, which is essential for achieving intensive combustion without unburnt, thanks to provisions very simple constructive. This homogeneous mixture is achieved by the combination of three means:
  • - efficient mixing of air and gas in the premixing zone between the two internal and intermediate tubes, favored essentially by the gyratory movement of the air and the thinness of the layer of air formed by a ring.
  • - a maximum final contact surface between the premix and the combustion air at the nose of the burner since the premix comes out in a thin layer and sandwiched between two streams of combustion air.
  • - intense interpenetration of the premix and air jets by cross currents in a reduced section constituting the burner nose.

On notera par ailleurs, que la zone où se développe la combustion et qui est à très haute température n'est en contact avec aucune pièce constitutive du brûleur et que l'on s'est interdit, par exemple, l'utilisation de tout diaphragme ou de toute pièce fonctionnelle en aval de la zone de combustion pour des raisons évidentes de tenue et de prix des matériaux.It will also be noted that the zone where combustion takes place and which is at a very high temperature is not in contact with any component of the burner and that the use of any diaphragm, for example, has been prohibited. or any functional part downstream of the combustion zone for obvious reasons of resistance and price of materials.

On notera que le jet centripète d'air de combustion conserve un mouvement giratoire, qui entraîne dans son mouvement le jet axial de prémélange. Le mélange final a donc lui aussi un effet giratoire propice à l'obtention d'une "flamme boule" qui, comme on le sait, a un faible volume et une haute intensité de combustion, du fait de la recirculation des gaz brûlés devant le diaphragme. Celui-ci, étant refroidi par l'air de combustion, ne chauffe que très peu et peut donc être réalisé en acier ordinaire.It will be noted that the centripetal jet of combustion air retains a gyratory movement, which in its movement causes the axial jet of premix. The final mixture therefore also has a gyratory effect conducive to obtaining a "ball flame" which, as is known, has a low volume and a high combustion intensity, due to the recirculation of the burnt gases in front of the diaphragm. This, being cooled by the combustion air, heats very little and can therefore be made of ordinary steel.

Le prémélange contenant une faible proportion de l'air de combustion, qui a pénétré par le tube intermédiaire et quia servi à entrainer le gaz, est hors des limites d'inflammabilité. D'autre part, le redressement opéré par les ailettes sur l'écoulement giratoire du prémélange a pour effet de conférer au jet de prémélange sortant au nez du brûleur une vitesse axiale maximale. On comprend que tout risque de retour de flamme est ainsi éliminé.The premix containing a small proportion of the combustion air, which has entered the intermediate tube and which has been used to entrain the gas, is outside the flammability limits. On the other hand, the straightening effected by the fins on the gyratory flow of the premix has the effect of giving the premix jet exiting at the nose of the burner a maximum axial speed. It is understood that any risk of flashback is thus eliminated.

La flamme obtenue est très stable, sans que l'on ait à utiliser, comme il est d'usage, des dispositifs spéciaux, tels qu'un ouvreau réfractaire.The flame obtained is very stable, without having to use, as is customary, special devices, such as a refractory pipe.

La combustion très rapide et la forme de la flamme-, d'une part, la recirculation des gaz brûlés au nez du brûleur, d'autre part, permettent d'utiliser le brûleur selon l'invention dans une chambre de combustion de faible volume, ou sans chambre directement dans l'enceinte thermique à chauffer. Lorsque la combustion est chambrée, la chambre peut être métallique et froide , sans risque de "trampage de flamme", ni de formation d'imbrûlés.The very rapid combustion and the shape of the flame - on the one hand, the recirculation of the burnt gases at the nose of the burner, on the other hand, make it possible to use the burner according to the invention in a combustion chamber of small volume , or without a chamber directly in the thermal enclosure to be heated. When the combustion is chambered, the chamber can be metallic and cold, without risk of "flame tramping", or of formation of unburnt.

Selon une autre caractéristique de l'invention, le tube central présente, dans la zone se trouvant en regard des ailettes, au moins un orifice, qui permet de dériver une fraction du débit de prémélange qui s'écoule dans le tube intermédiaire, vers le tube central, ledit orifice étant surmonté immédiatement en amont, par un obstacle ou un diaphragme annulaire monté dans le tube central.According to another characteristic of the invention, the central tube has, in the area located opposite the fins, at least one orifice, which makes it possible to divert a fraction of the premix flow rate which flows in the intermediate tube, towards the central tube, said orifice being surmounted immediately upstream by an obstacle or an annular diaphragm mounted in the central tube.

Grâce à la prévision de l'orifice et du diaphragme annulaire, un faible débit de prémélange est prélé- vé dans le tube intermédiaire et vient se mélanger avec l'air de combustion qui circule dans le tube central, en donnant un mélange à régime laminaire dépourvu de toute turbulence. En effet, l'air de combustion qui s'écoule dans le tube central étant freiné par le diaphragme annulaire, il se crée sous ce dernier une zone morte où règne une dépression qui contient l'orifice. Un débit de prémélange est donc aspiré à travers ledit orifice par la depression.Thanks to the provision of the orifice and the annular diaphragm, a low rate of premix is taken from the intermediate tube and is mixed with the combustion air which circulates in the central tube, giving a mixture at laminar speed. devoid of any turbulence. In fact, the combustion air flowing in the central tube being braked by the annular diaphragm, a dead zone is created beneath the latter which contains a depression which contains the orifice. A premix flow is therefore sucked through said orifice by the vacuum.

Ce débit se mélange avec l'air qui circule dans le tube central pour former un mélange laminaire qui donne naissance à une flamme intérieure à la flamme principale qui est accrochée derrière le diaphragme de sortie. Cette flamme, qui est d'une grande stabilité constitue une véritable flamme pilote d'allumage intégrée dans le brûleur. Ce pilote est, bien entendu, à fonctionnement permanent, mais une alimentation en gaz indépendante de l'alimentation principale est également facilement réalisable.This flow mixes with the air which circulates in the central tube to form a laminar mixture which gives rise to an interior flame with the principal flame which is hung behind the exit diaphragm. This flame, which is very stable, constitutes a true pilot ignition flame integrated in the burner. This pilot is, of course, permanently operating, but a gas supply independent of the main supply is also easily achievable.

La grande stabilité de la flamme pilote rend possible la mise en place d'un dispositif de contrôle de flamme à ionisation, qui, comme on le sait,ne fonctionne correctement que si son électrode se trouve constamment plongée dans une zone où la combustion est particulièrement stable. Dans le cas présent, l'électrode du dispositif de contrôle de flamme est placée dans la flamme pilote.The great stability of the pilot flame makes it possible to install an ionization flame control device, which, as we know, only works properly if its electrode is constantly submerged in an area where combustion is particularly stable. In this case, the electrode of the flame control device is placed in the pilot flame.

Il va de soi que l'on peut utiliser également tout autre type connu de dispositif de contrôle de flamme, par exemple celui à cellule à ultraviolet. Dans ce cas, le tube central servira de tube de visée, une fenêtre transparente étant formée sur la paroi de fond du tube externe pour l'observation par la cellule.It goes without saying that any other known type of flame control device can also be used, for example that with an ultraviolet cell. In this case, the central tube will serve as a sighting tube, a transparent window being formed on the bottom wall of the external tube for observation by the cell.

Un mode de réalisation de l'invention sera décrit à présent en détail, à titre d'exemple non limitatif, en regard de dessin annexé, sur lequel :

  • La figure 1 est une vue en plan du brûleur dans le sens de la flèche F de la figure 2 ; et
  • La figure 2 est une vue en coupe axiale suivant la ligne II-II de la figure 1.
An embodiment of the invention will now be described in detail, by way of nonlimiting example, with reference to the appended drawing, in which:
  • Figure 1 is a plan view of the burner in the direction of arrow F in Figure 2; and
  • FIG. 2 is a view in axial section along the line II-II of FIG. 1.

Le brûleur représenté sur les figures est constitué de trois éléments tubulaires métalliques 10, 12, 14, par exemple en acier, montés coaxialement l'un par rapport à l'autre. Le tube externe 10 est fermé à une extrémité par une paroi de fond 16 et est ouvert à l'autre extrémité. Au voisinage de ladite extrémité, le tube externe 10 est muni sur sa paroi interne d'un diaphragme annulaire 18 destiné à restreindre la section de passage du tube.The burner shown in the figures consists of three metallic tubular elements 10, 12, 14, for example of steel, mounted coaxially with respect to each other. The outer tube 10 is closed at one end by a bottom wall 16 and is open at the other end. In the vicinity of said end, the outer tube 10 is provided on its inner wall with an annular diaphragm 18 intended to restrict the passage section of the tube.

Le tube intermédiaire 12 a un diamètre nettement inférieur à celui du tube externe de manière à former avec celui-ci une chambre externe 20. De même, le tube interne 14 définit avec le tube 12 une chambre intermédiaire 22 et intérieurement, une chambre interne 24.The intermediate tube 12 has a diameter much smaller than that of the external tube so as to form with the latter an external chamber 20. Similarly, the internal tube 14 defines with the tube 12 an intermediate chamber 22 and internally, an internal chamber 24 .

Les tubes 12 et 14 ont pratiquement la même longueur et sont plus courts que la portion de tube externe comprise entre la paroi de fond 16 et le diaphragme 18. Ils sont positionnés à l'intérieur dudit tube externe de manière queles chambres 20, 22 et 24 communiquent entre elles à leurs deux extrémités.The tubes 12 and 14 are practically the same length and are shorter than the portion of external tube included between the bottom wall 16 and the diaphragm 18. They are positioned inside said external tube so that the chambers 20, 22 and 24 communicate with each other at their two ends.

Le tube externe 10 présente au voisinage de la paroi de fond 16 un orifice 26, dans lequel se raccorde tangentiellement une canalisation 28 d'alimentation en air de combustion, reliée à un ventilateur.The external tube 10 has, in the vicinity of the bottom wall 16, an orifice 26, in which a supply pipe 28 is tangentially connected. in combustion air, connected to a fan.

Le gaz est amené dans la chambre intermédiaire 22, à une pression supérieure à celle de l'air, au moyen d'une canne longitudinale 30, qui est emmanchée à travers un orifice percé dans la paroi de fond 16 et qui est encastrée dans une échancrure formée à l'extrémité supérieure du tube interne 14. La portion de la canne qui est intérieure à la chambre intermédiaire 22 est pourvue d'une pluralité d'orifices 32, par lesquels le gaz s'écoule selon une direction radiale.The gas is brought into the intermediate chamber 22, at a pressure higher than that of the air, by means of a longitudinal rod 30, which is fitted through an orifice drilled in the bottom wall 16 and which is embedded in a notch formed at the upper end of the inner tube 14. The portion of the rod which is inside the intermediate chamber 22 is provided with a plurality of orifices 32, through which the gas flows in a radial direction.

Le tube intermédiaire 12 se termine à son extrémité inférieure par un diaphragme annulaire 34 s'étendant vers l'extérieur, au-dessus du diaphragme 18, de façon à former avec lui un passage à chicane 36, de direction sensiblement radiale.The intermediate tube 12 ends at its lower end with an annular diaphragm 34 extending outwards, above the diaphragm 18, so as to form with it a passage with baffle 36, of substantially radial direction.

Le tube interne 14 est muni sur la paroi externe de sa portion terminale inférieure, d'une pluralité d'ailettes longitudinales 38, s'étendant radialement jusqu'au tube intermédiaire 12. Dans sa portion qui est munie d'ailettes, le tube interne est percé de deux orifices 40 répartis sur une section droite du tube interne. De plus, ce dernier est muni sur sa paroi interne, immédiatement au-dessus des orifices, 40 d'un diaphragme annulaire 42, qui s'étend vers le centre du tube interne de façon à en restreindre la section de passage.The inner tube 14 is provided on the outer wall of its lower end portion, with a plurality of longitudinal fins 38, extending radially to the intermediate tube 12. In its portion which is provided with fins, the inner tube is pierced with two orifices 40 distributed over a cross section of the internal tube. In addition, the latter is provided on its internal wall, immediately above the orifices, 40 with an annular diaphragm 42, which extends towards the center of the internal tube so as to restrict its passage section.

Le fonctionnement du brûleur qui vient d'être décrit est le suivant :

  • L'air qui arrive par la canalisation 28 pénètre tangentiellement dans la chambre externe 20 et se divise en :
    • - un courant externe et un courant central d'air de combustion s'écoulant tous deux selon un mouvement hélicoïdal, respectivement dans la chambre externe 20 et dans la chambre centrale 24, et
    • - un courant intermédiaire de faible débit, qui s'écoule dans la chambre intermédiaire 22 également selon un mouvement hélicoïdal. Ce courant rencontre le jet radial de gaz émis à travers les orifices 32, sous un angle pratiquement droit, ce qui assure un brassage énergique de l'air et du gaz et permet d'obtenir un prémélange homogène. Ce prémélange se déplace le long du tube intermédiaire selon un mouvement hélicoïdal, puis il est orienté axialement par les ailettes 38, de sorte qu'il arrive au nez 44 du brûleur avec une vitesse de sortie axiale maximale.
  • L'air de combustion qui s'écoule dans la chambre externe 20 passe à travers le passage 36 défini entre les diaphragmes 18, 34, qui l'orientent vers l'axe du brûleur. Les jets d'air de combustion et de prémélange se rencontrent donc, au nez du brûleur, à angle droit, pour former un mélange inflammable homogène. Lteffet giratoire du courant d'air de combustion se conserve dans le mélange obtenu, ce qui favorise la recirculation des produits de combustion dans la zone de mélange et donc l'obtention d'une combustion en flamme boule" caractérisée par une flamme 45 de faible volume et de haute intensité de combustion.
The operation of the burner which has just been described is as follows:
  • The air which arrives through the pipe 28 tangentially enters the external chamber 20 and is divided into:
    • an external current and a central current of combustion air both flowing in a helical movement, respectively in the external chamber 20 and in the central chamber 24, and
    • - a low flow intermediate current, which also flows into the intermediate chamber 22 in a helical movement. This current meets the radial jet of gas emitted through the orifices 32, at a practically right angle, which ensures vigorous mixing of the air and the gas and makes it possible to obtain a homogeneous premix. This premix moves along the intermediate tube in a helical movement, then it is oriented axially by the fins 38, so that it arrives at the nose 44 of the burner with a maximum axial outlet speed.
  • The combustion air flowing in the external chamber 20 passes through the passage 36 defined between the diaphragms 18, 34, which orient it towards the axis of the burner. The jets of combustion air and premix therefore meet at the nose of the burner at right angles to form a homogeneous flammable mixture. L t turning effect of the combustion air stream is preserved in the resulting mixture, which promotes the recirculation of the combustion products in the mixing zone and thus obtaining a flame burning ball "characterized by a flame 45 low volume and high combustion intensity.

De plus, tout risque de retour de flamme est exclu pris que en amont du nez du brûleur, le prémélange circulant dans la chambre intermédiaire 22 est trop riche en gaz pour être inflammable.In addition, any risk of flashback is excluded, taken that upstream of the burner nose, the premix circulating in the intermediate chamber 22 is too rich in gas to be flammable.

La flamme obtenue est particulièrement stable, sans qu'il soit nécessaire d'adjoindre au brûleur un dispositif spécial, tel qu'un ouvreau réfractaire. Malgré la haute température de la flamme, le diaphragme 18 ne chauffe que très peu, du fait qu'il est refroidi par l'air de combustion. C'est pourquoi, et c'est là un avantage important de l'invention, les pièces constitutives du brûleur peuvent être réalisées en acier ordinaire.The flame obtained is particularly stable, without the need to add to the burner a special device, such as a refractory pipe. Despite the high flame temperature, the diaphragm 18 heats only very little, because it is cooled by the combustion air. This is why, and this is an important advantage of the invention, the constituent parts of the burner can be made of ordinary steel.

En raison de la rapidité et de la forme de la flamme obtenue, le brûleur peut ne comporter qu'une chambre de combustion 46 de très faible volume, comme le montre la figure 2, ou pas de chambre du tout.Due to the speed and the shape of the flame obtained, the burner may have only one combustion chamber 46 of very small volume, as shown in Figure 2, or no room at all.

Le tube central 14 peut servir de tube de visée pour un contrôle de flamme de type à cellule, non représenté. Une fenêtre de visée transparente 48 est alors formée dans la paroi de fond 16 pour l'observation par la cellule.The central tube 14 can serve as a sighting tube for a cell type flame control, not shown. A transparent sight window 48 is then formed in the bottom wall 16 for observation by the cell.

On peut mettre en place dans le tube central l'électrode d'un dispositif de contrôle de flamme à ionisation. Ainsi qu'on l'a expliqué précédemment, cette électrode doit être placée dans une zone de grande stabilité de flamme pour que le courant qu'elle fournit puisse être représentatif de l'état de fonctionnement du brûleur.The electrode of an ionization flame control device can be placed in the central tube. As explained above, this electrode must be placed in a zone of great flame stability so that the current which it supplies can be representative of the operating state of the burner.

Dans le brûleur représenté à la figure 2, cette zone est localisée en 50 à l'intérieur du tube central, en aval du diaphragme interne 42. En effet, ce dernier, en freinant l'écoulement du courant d'air de combustion qui s'écoule dans la chambre interne, crée sous lui une zone morte dépressive. La dépression a pour effet d'aspirer à travers les orifices 40 un faible débit de prémélange, qui rencontre l'air de combustion qui s'écoule dans la chambre centrale pour former un mélange inflammable non giratoire. On obtient donc une petite flamme centrale 52 très stable, qui s'accroche derrière le diaphragme interne 42 et qui constitue une véritable flamme pilote d'allumage intégrée au brûleur.In the burner shown in FIG. 2, this zone is located at 50 inside the central tube, downstream of the internal diaphragm 42. Indeed, the latter, by slowing the flow of the stream of combustion air which s flows into the internal chamber, creates a depressed dead zone under it. The depression has the effect of sucking through the orifices 40 a low flow rate of premix, which meets the combustion air which flows in the central chamber to form a non-gyratory flammable mixture. A very stable small central flame 52 is therefore obtained, which hooks behind the internal diaphragm 42 and which constitutes a true pilot ignition flame integrated into the burner.

La flamme pilote peut être également directement alimentée en gaz à partir de la canne 30 par un conduit non représenté.The pilot flame can also be directly supplied with gas from the rod 30 by a conduit not shown.

Cette flamme pilote peut être facilement allumée par un dispositif classique d'étincelage à haute tension, puis allume à son tour la flamme principale du brûleur.This pilot flame can be easily ignited by a conventional high-voltage spark device, then ignites the main burner flame.

L'allumage de ce pilote très fiable et le circuit court du gaz combustible autorisent des temps d'allumage inférieurs à une seconde, procurant ainsi une sécurité supérieure à celle de la plupart des brûleur du commerce et permettant en particulier l'emploi du brûleur en toute sécurité sur des enceintes de très faible volume ou à forte perte de charge.The ignition of this very reliable pilot and the short fuel gas circuit allow ignition times of less than one second, thus providing greater safety than that of most commercial burner and in particular allowing the burner to be used safely on very small volume or high pressure drop enclosures.

On notera encore la simplicité de la structure et de l'assemblage du brûleur selon l'invention. Il peut être réalisé au moyen d'éléments courants du commerce, tels que des tubes et diaphragmes en acier, qui peuvent être solidarisés entre eux à l'aide de moyens appropriés économiques. C'est ainsi par exemple que le tube intermédiaire 12 peut être fixé en position coaxiale dans le tube externe 10 au moyen de boulons qui traversent des pattes faisant saillie à son bord supérieur et, sur la face interne 14, il est maintenu en position centrée, par rapport au tube intermédiaire, par les ailettes 38 qui prennent appui sur ce dernier. De plus, il est maintenu contre tout déplacement axial par la canne d'amenée de gaz 30.Note also the simplicity of the structure and assembly of the burner according to the invention. It can be achieved by means of common commercial elements, such as steel tubes and diaphragms, which can be joined together using suitable economical means. Thus, for example, the intermediate tube 12 can be fixed in a coaxial position in the external tube 10 by means of bolts which pass through tabs projecting at its upper edge and, on the internal face 14, it is maintained in the centered position. , relative to the intermediate tube, by the fins 38 which bear on the latter. In addition, it is held against any axial displacement by the gas supply rod 30.

Le brûleur selon l'invention permet de réaliser une combustion rapide, stable et complète, avec un transfert intense de chaleur, sans qu'aucune pièce du brûleur n'ait à supporter de contrainte thermique particulière.The burner according to the invention allows rapid, stable and complete combustion, with intense heat transfer, without any part of the burner having to withstand any particular thermal stress.

Claims (9)

1.-Brûleur à mélange préalable intégré, caractérisé en ce qu'il comprend : - trois tubes coaxiaux (10, 12, 14), dont le tube externe {10) est obturé à une extrémité par une paroi de fond (16) et dont les deux autres (12, 14) sont ouverts et se terminent à une extrémité à une distance prédéterminée de ladite paroi de fond, l'air comburant débouchant tangentiellement dans le tube externe au voisinage de son extrémité qui est voisine de ladite paroi de fond (16), tandis que le gaz (30) débouche radialement à l'intérieur du tube intermédiaire (12), également au voisinage de son extrémité voisine de la paroi de fond, le débit de l'air étant réglé pour qu'il se divise en trois courants, dont deux pénètrent dans le tube externe et dans le tube interne et constituent l'air de combustion et dont le troisième pénètre dans le tube intermédiaire (12) et forme avec le gaz un prémélange non inflammable, - de premiers moyens de déflexion (18, 34) montés dans le tube externe, légèrement en aval de l'extrémité de sortie du tube intermédiaire, de manière à rabattre le courant d'air de combustion vers l'axe du brûleur, et - de seconds moyens de déflexion (38) montés à la sortie du tube intermédiaire, pour orienter le courant de prémélange dans l'axe du brûleur, de sorte que les deux courants susmentionnés se croisent dans la zone de mélange du brûleur. 1.-Integrated premix burner, characterized in that it comprises: - three coaxial tubes (10, 12, 14), the outer tube {10) of which is closed at one end by a bottom wall (16) and the other two of which (12, 14) are open and terminate at one end at a predetermined distance from said bottom wall, the combustion air opening tangentially into the external tube in the vicinity of its end which is close to said bottom wall (16), while the gas (30) opens radially inside of the intermediate tube (12), also in the vicinity of its end close to the bottom wall, the air flow rate being adjusted so that it divides into three streams, two of which enter the external tube and the internal tube and constitute the combustion air and the third of which enters the intermediate tube (12) and forms with the gas a non-flammable premix, - first deflection means (18, 34) mounted in the external tube, slightly downstream from the outlet end of the intermediate tube, so as to reduce the flow of combustion air towards the axis of the burner, and - second deflection means (38) mounted at the outlet of the intermediate tube, for orienting the premixing current in the axis of the burner, so that the two aforementioned currents cross in the mixing zone of the burner. 2.- Brûleur selon la revendication 1, caractérisé en ce que lesdits moyens de déflexion sont constitués par des ailettes radiales longitudinales (38), montées entre le tube intermédiaire et le tube interne au voisinage de l'extrémité de sortie de ces derniers et par au moins un diaphragme (18), monté dans le tube externe (10) légèrement en aval de l'extrémité de sortie du tube intermédiaire (12).2.- Burner according to claim 1, characterized in that said deflection means are constituted by longitudinal radial fins (38), mounted between the intermediate tube and the internal tube in the vicinity of the outlet end of the latter and by at least one diaphragm (18), mounted in the outer tube (10) slightly downstream of the outlet end of the intermediate tube (12). 3.- Brûleur selon la revendication 2, caractérisé en ce que le tube externe (10) est muni sur sa paroi interne d'un premier diaphragme annulaire (18) s'éten- dans vers l'intérieur et situé sous l'extrémité de sortie du tube intermédiaire (12), et en ce que ce dernier est muni à son extrémité de sortie d'un second diaphragme annulaire (34) s'étendant vers l'extérieur, lesdits premier et second diaphragmes définissant entre eux un passage annulaire à chicanes (36), dans lequel le courant d'air de combustion'qui arrive du tube externe est rabattu vers l'axe du brûleur.3.- Burner according to claim 2, characterized in that the outer tube (10) is provided on its inner wall with a first annular diaphragm (18) extending inwards and located under the outlet end of the intermediate tube (12), and in that the latter is provided at its outlet end with a second annular diaphragm (34) extending outwards, said first and second diaphragms defining between them an annular passage with baffles (36), in which the current d 'combustion air' which comes from the external tube is folded towards the axis of the burner. 4.- Brûleur selon l'une des revendications précédentes, caractérisé en ce que le tube central (14) présente, dans la zone se trouvant en regard des ailettes (38), au moins un orifice (40) qui permet de dériver une fraction du débit de prémélange qui s'écoule dans le tube intermédiaire (12) vers le tube central (14), ledit orifice étant surmonté, immédiatement en amont, par un obstacle ou un diaphragme annulaire (42) monté dans le tube central et sur lequel se développe une flamme centrale pilote (52).4.- Burner according to one of the preceding claims, characterized in that the central tube (14) has, in the area located opposite the fins (38), at least one orifice (40) which makes it possible to derive a fraction of the premix flow which flows in the intermediate tube (12) towards the central tube (14), said orifice being surmounted, immediately upstream, by an obstacle or an annular diaphragm (42) mounted in the central tube and on which a pilot central flame develops (52). 5.- Brûleur selon l'une des revendications 1 à 3, caractérisé en ce que le tube central (14) comporte un conduit grâce auquel du gaz pur est prélevé sur l'arrivée de gaz (30)pour.alimenter une flamme pilote (52) s'accrochant derrière un diaphragme annulaire (42) du tube central.5.- Burner according to one of claims 1 to 3, characterized in that the central tube (14) comprises a duct through which pure gas is taken from the gas inlet (30) pour.aliment a pilot flame ( 52) hooking behind an annular diaphragm (42) of the central tube. 6.- Brûleur selon l'une des revendications précédentes, caractérisé en ce qu'un dispositif de contrôle de flamme est monté dans le tube central, dans la région de la flamme pilote.6.- Burner according to one of the preceding claims, characterized in that a flame control device is mounted in the central tube, in the region of the pilot flame. 7.- Brûleur selon la revendication 4, caractérisé en ce que le dispositif de contrôle de flamme est du type à cellule à ultra-violet, et en ce quele tube externe présente dans sa paroi de fond (16) une fenêtre de visée (48).7.- Burner according to claim 4, characterized in that the flame control device is of the ultraviolet cell type, and in that the outer tube has in its bottom wall (16) a sight window (48 ). 8.- Brûleur selon la revendication 6, caractérisé en ce que le dispositif de contr8le de flamme est du type à ionisation, dont l'électrode est plongée dans la flamme pilote.8.- Burner according to claim 6, characterized in that the flame control device is of the ionization type, the electrode of which is immersed in the pilot flame. 9.- Brûleur selon les revendications 4 à 8, caractérisé en ce qu'un dispositif d'allumage électrique est monté dans le tube central, dans la région de la flamme pilote.9. Burner according to claims 4 to 8, characterized in that an electric ignition device is mounted in the central tube, in the region of the pilot flame.
EP85401683A 1984-09-04 1985-08-26 Burner with a priorily mixture and an integrated pilot-flame Expired - Lifetime EP0178198B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8413603A FR2569825B1 (en) 1984-09-04 1984-09-04 INTEGRATED PRE-MIXTURE BURNER WITH INTEGRATED PILOT FLAME
FR8413603 1984-09-04

Publications (3)

Publication Number Publication Date
EP0178198A2 true EP0178198A2 (en) 1986-04-16
EP0178198A3 EP0178198A3 (en) 1987-09-02
EP0178198B1 EP0178198B1 (en) 1990-07-18

Family

ID=9307414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401683A Expired - Lifetime EP0178198B1 (en) 1984-09-04 1985-08-26 Burner with a priorily mixture and an integrated pilot-flame

Country Status (5)

Country Link
EP (1) EP0178198B1 (en)
DE (1) DE3578727D1 (en)
DK (1) DK161908B (en)
ES (1) ES8701950A1 (en)
FR (1) FR2569825B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006998A1 (en) * 1986-05-13 1987-11-19 Joh. Vaillant Gmbh U. Co Process for operating a pre-mix gas burner
FR2772461A1 (en) * 1997-12-15 1999-06-18 Julien Lacaze Industrial burner with premixing of air and gas
EP1036984A1 (en) * 1999-03-18 2000-09-20 G. Kromschröder Aktiengesellschaft Premix type gas burner
WO2007012755A1 (en) * 2005-07-26 2007-02-01 Optimise Method and installation for unsupported lean fuel gas combustion, using a burner and related burner

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4446842B4 (en) * 1994-12-27 2006-08-10 Alstom Method and device for feeding a gaseous fuel into a premix burner
CN107559824A (en) * 2016-06-30 2018-01-09 深圳市爱可机器人技术有限公司 All-premixing burner and the cooking device for including it
CN111467991B (en) * 2020-03-09 2021-07-09 南京航空航天大学 Passive multi-fluid mixer
DE102021120465A1 (en) 2021-08-06 2023-02-09 Harting Electric Stiftung & Co. Kg Electrical contact element and method for connecting a conductor to the electrical contact element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1142406A (en) * 1967-03-06 1969-02-05 Inst Gaza Akademii Nauk Ukrain Gas burners
FR2148710A5 (en) * 1971-07-30 1973-03-23 Turbine Foyers
DE2428622A1 (en) * 1973-06-15 1975-01-09 O F R Officine Fratelli Riello Nozzle head for burning gas with compressed air - has plate for retarding air flow speed and for mixing gas with air

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1142406A (en) * 1967-03-06 1969-02-05 Inst Gaza Akademii Nauk Ukrain Gas burners
FR2148710A5 (en) * 1971-07-30 1973-03-23 Turbine Foyers
DE2428622A1 (en) * 1973-06-15 1975-01-09 O F R Officine Fratelli Riello Nozzle head for burning gas with compressed air - has plate for retarding air flow speed and for mixing gas with air

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006998A1 (en) * 1986-05-13 1987-11-19 Joh. Vaillant Gmbh U. Co Process for operating a pre-mix gas burner
FR2772461A1 (en) * 1997-12-15 1999-06-18 Julien Lacaze Industrial burner with premixing of air and gas
EP1036984A1 (en) * 1999-03-18 2000-09-20 G. Kromschröder Aktiengesellschaft Premix type gas burner
WO2007012755A1 (en) * 2005-07-26 2007-02-01 Optimise Method and installation for unsupported lean fuel gas combustion, using a burner and related burner
FR2889292A1 (en) * 2005-07-26 2007-02-02 Optimise Sarl METHOD AND INSTALLATION FOR COMBUSTION WITHOUT SUPPORT OF POOR COMBUSTIBLE GAS USING A BURNER AND BURNER THEREFOR
EA012937B1 (en) * 2005-07-26 2010-02-26 Оптимиз Method for a lean gas combustion, a burner and installation

Also Published As

Publication number Publication date
DK401685D0 (en) 1985-09-03
FR2569825B1 (en) 1988-12-09
EP0178198B1 (en) 1990-07-18
DK401685A (en) 1986-03-05
ES546707A0 (en) 1986-12-01
FR2569825A1 (en) 1986-03-07
DK161908B (en) 1991-08-26
DE3578727D1 (en) 1990-08-23
EP0178198A3 (en) 1987-09-02
ES8701950A1 (en) 1986-12-01

Similar Documents

Publication Publication Date Title
EP0334736B1 (en) Gas burners
EP1512913B1 (en) Injection system for air and fuel with means to produce cold plasma
EP0296032B1 (en) Burning system with high exhaust gas exit speed
EP0182687A1 (en) Injection system with a variable geometry
EP0106712B1 (en) Method and device for the electric ignition of an oxyfuel burner
EP2147253B1 (en) Internal combustion burner
EP0178198B1 (en) Burner with a priorily mixture and an integrated pilot-flame
EP0270424B1 (en) Ignition device for a high-speed burner with a cold nozzle, and burner using this device
FR2511478A1 (en) BURNER WITH GAS MIX
EP0006774B1 (en) Liquid fuel burner
FR2633917A1 (en) HIGH THROUGHPUT SODIUM CHLORATE OXYGEN GENERATOR ASSEMBLY
EP1074790B1 (en) Burner with exhaust recirculation
CA3146685A1 (en) Modular burner and furnace comprising this burner
EP0003000A1 (en) Burner head for a combustion chamber
EP0775868B1 (en) Gas burner for a furnace for reheating steel industry products
WO2003069226A1 (en) Internal combustion burner, particularly for drawing mineral fibres
FR2536509A1 (en) DEVICE EQUIPPED WITH A BURNER AND A HEAT EXCHANGER
EP1172607B1 (en) Gas burner with increased power
EP0549416B1 (en) Grid burner and heating installation comprising same
CH631004A5 (en) APPARATUS FOR COMBUSTING A MIXTURE OF AIR AND FUEL.
WO2016193608A1 (en) Sonic injection furnace
CA3223831A1 (en) Flame-proof and explosion-proof surface combustion gas burner
FR2774745A1 (en) PROCESS FOR HEATING PRODUCTS IN AN ENCLOSURE AND BURNER FOR THE IMPLEMENTATION OF THIS PROCESS
BE542048A (en)
BE821191A (en) Impulse burner - is particulary used in glass-making and pipeline heating

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: A2

Designated state(s): BE CH DE GB IT LI LU NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

RHK1 Main classification (correction)

Ipc: F23D 14/62

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE CH DE GB IT LI LU NL

17P Request for examination filed

Effective date: 19871219

17Q First examination report despatched

Effective date: 19890220

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO MILANO S.P.A.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE GB IT LI LU NL

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

Ref country code: NL

Effective date: 19900718

REF Corresponds to:

Ref document number: 3578727

Country of ref document: DE

Date of ref document: 19900823

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
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
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19910814

Year of fee payment: 7

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

Ref country code: GB

Payment date: 19910816

Year of fee payment: 7

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

Ref country code: DE

Payment date: 19910825

Year of fee payment: 7

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

Ref country code: BE

Payment date: 19910828

Year of fee payment: 7

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

Ref country code: CH

Payment date: 19910830

Year of fee payment: 7

ITTA It: last paid annual fee
EPTA Lu: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

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

Effective date: 19920826

Ref country code: GB

Effective date: 19920826

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

Ref country code: LI

Effective date: 19920831

Ref country code: CH

Effective date: 19920831

Ref country code: BE

Effective date: 19920831

BERE Be: lapsed

Owner name: TOTALGAZ CIE FRANCAISE DES GAZ LIQUEFIES

Effective date: 19920831

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19920826

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: DE

Effective date: 19930501