EP0953804B1 - Flamestrip for atmospheric and premixing gas burner - Google Patents

Flamestrip for atmospheric and premixing gas burner Download PDF

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Publication number
EP0953804B1
EP0953804B1 EP99401012A EP99401012A EP0953804B1 EP 0953804 B1 EP0953804 B1 EP 0953804B1 EP 99401012 A EP99401012 A EP 99401012A EP 99401012 A EP99401012 A EP 99401012A EP 0953804 B1 EP0953804 B1 EP 0953804B1
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EP
European Patent Office
Prior art keywords
slots
axis
flame
offset
outlet strip
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.)
Expired - Lifetime
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EP99401012A
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German (de)
French (fr)
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EP0953804A1 (en
Inventor
Lila Menari
Stephen Daemon Andrews
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Saunier Duval Eau Chaude Chauffage SDECC SA
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Saunier Duval Eau Chaude Chauffage SDECC SA
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Publication of EP0953804A1 publication Critical patent/EP0953804A1/en
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    • 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
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits

Definitions

  • the invention relates to a gas burner atmospheric and premixed and concerns more particularly the distribution of the outlet orifices of flame on the burner ramp according to the preamble of claim 1.
  • a gas burner atmospheric and premixed and concerns more particularly the distribution of the outlet orifices of flame on the burner ramp according to the preamble of claim 1.
  • Such a burner is known from document FR-A-2 319 080.
  • Gas burners in particular for bath heaters or boilers usually consist of two half-shells stamped lines delimiting the air-gas mixing chamber, the shells being assembled to form an orifice longitudinal, which is capped with a sheet metal grid provided a plurality of gas outlet ports.
  • the ramps of burner thus produced are generally placed side by side side and parallel to form a unit capable of operate with different kinds of gas.
  • a conventional embodiment of a burner ramp consists in piercing the flame outlet grid with a succession of orifices in the form of rectangular slots which are aligned close to one another.
  • the length of the strip covered by the orifices defines the total length of the flame obtained.
  • the surface covered by the flame obviously corresponds to the product of this total length by the width which is none other than the length of a slit.
  • the flame is thus concentrated and the flame front is delimited by the perimeter of the slots thus aligned.
  • the contact surface between the air and the flame corresponds to this perimeter, which limits the entry of cooling air; therefore the sheet metal parts adjacent to the slots are brought to high temperature and subjected to thermomechanical stresses; the production of No x linked to the flame temperature is therefore not negligible.
  • the invention provides a new solution in the arrangement of the flame exit orifices, which allows an increase in the flame front at the same time as a reduction in its thickness, and which goes in the direction of improving stability. flame, better cooling, and reduced emission of No x .
  • the subject of the invention is therefore an exit ramp from flames for atmospheric and premix gas burner comprising a sheet metal grid pierced with a succession of rectangular slots, ramp along which the slots are distributed on either side of the longitudinal axis of the grid and form a sinusoid extending over the entire length of the grid, which increases the length of the front of flames.
  • the slots are spaced apart others by a constant distance along the axis of the wire rack.
  • the slots are identical, each of them being offset from its immediate neighbor.
  • FIG. 1 a flame outlet grid formed of a sheet metal strip 1 from which are cut slots 2 which are distributed on either side of the longitudinal axis 3 of the grid, and arranged in lace.
  • Figure 2 shows these slots 2 of general rectangular shape.
  • the slots are identical and spaced from each other by a constant distance e along axis 3.
  • each slot perpendicular to this axis, each slot is offset from its neighbor immediate, with half a slot length demi / 2.
  • This half length l / 2 is preferable but not compulsory. Through example it could be variable between l / 5 and l / 0.5.
  • the ends of the slots form thus a sinusoid on either side of axis 3 as it appears on the left side of figure 1, this sinusoid extending over the entire length of the grid.
  • the slots are sized to prevent returns from flame and peeling or blowing. Lag thus introduced between the slots, relative to a conventional alignment, increases the length of the front flame, since this corresponds to the sinusoid of slots.
  • This developed perimeter can reach, or even exceed three times the length of the flame front by one traditional grid which makes it possible to obtain a rate high primary air. Similarly, the area covered by the flame is seriously increased, up to six times. Through against the thickness of the flame is reduced by 70%.
  • the flame is thus "stretched" along a path sinusoidal having greater contact with the atmosphere surrounding which allows greater access to air secondary, promoting combustion as well as cooling.
  • the fact that the flame is shorter allows to place the burner closer to the heat exchanger heat which increases its yield and makes it possible to obtain a more compact device.
  • the products of hot combustion are cooled and vented over quickly. Also because there are more surfaces of contact between each slot and the metal part the temperature distribution and the burner cooling are better. So we have a bearable heating of the metal constituting the outputs of flame. Since there are fewer constraints thermomechanical, the service life of the burner is increased.
  • the slots 2 are of different length. There are slots having a length L and slots shorter of length l, the latter being centered on axis 3. the longer slots are grouped by pair, alternating with the short ones and they are shifted alternately on either side of the axis. The ends of the slots staggered along the axis form also a sinusoid, but less regular than that of the figure 1.
  • the burner arm made with an outlet grid flame of this type consists of a shaped shell classic whose dimensions have been optimized for obtain a primary aeration rate close to stoichiometry and uniform distribution of the mixture air / gas outlet. At maximum power, the flames obtained have the main characteristic of being arranged in "lace" and thus offer the maximum of contact surface with surrounding air.

Abstract

The burner rail is in the form of a sheet metal grid pierced with a series of rectangular outlet slots (2) spaced on either side of its lengthwise axis (3) in a sinusoidal wave configuration. The slots are spaced at even distances from the lengthwise axis, and each one is offset in relation to the neighboring one. In a variant of the design the slots can be of different lengths, with long slots offset from the axis and shorter ones centered on it.

Description

L'invention se rapporte à un brûleur à gaz atmosphérique et à prémélange et concerne plus particulièrement la répartition des orifices de sortie de flamme sur la rampe du brûleur selon le préambule de la revendication 1. Un tel brûleur est connu du document FR-A-2 319 080.The invention relates to a gas burner atmospheric and premixed and concerns more particularly the distribution of the outlet orifices of flame on the burner ramp according to the preamble of claim 1. Such a burner is known from document FR-A-2 319 080.

Les brûleurs à gaz notamment pour chauffe-bains ou chaudières sont habituellement constitués de deux demi-coquilles embouties délimitant la chambre de mélange air-gaz, les coquilles étant assemblées pour former un orifice longitudinal, lequel est coiffé d'une grille en tôle munie d'une pluralité d'orifices de sortie de gaz. Les rampes de brûleur ainsi réalisées sont généralement placées côte à côte et parallèlement pour former un ensemble capable de fonctionner avec différentes sortes de gaz.Gas burners, in particular for bath heaters or boilers usually consist of two half-shells stamped lines delimiting the air-gas mixing chamber, the shells being assembled to form an orifice longitudinal, which is capped with a sheet metal grid provided a plurality of gas outlet ports. The ramps of burner thus produced are generally placed side by side side and parallel to form a unit capable of operate with different kinds of gas.

Un certain nombre de précautions doivent être prises pour obtenir un fonctionnement correct. D'abord il faut éviter le phénomène connu de prise de feu aux injecteurs pour les gaz possédant une grande vitesse de propagation de flamme, c'est-à-dire qu'il faut réduire les orifices de sortie de flamme dans la rampe ; mais il y a une augmentation de la vitesse de sortie du mélange gaz-air primaire qui tend à produire le phénomène du décollement et du soufflage quand le gaz utilisé possède une faible vitesse de propagation de flammes. Ensuite il faut que chaque rampe de brûleur soit bien aérée, c'est-à-dire que la flamme du brûleur doit entraíner suffisamment d'air secondaire pour avoir un développement normal sans risque de décollement. Il est nécessaire enfin que l'interallumage entre les rampes de brûleur voisines s'effectue correctement pour que, même à faible débit de gaz, l'ensemble des rampes s'allume sans difficultés.A number of precautions should be taken to obtain correct operation. First you must avoid the known phenomenon of igniting the injectors for gases with a high propagation speed flame, that is to say reduce the orifices of flame outlet in the ramp; but there is a increased gas-air mixture exit speed primary which tends to produce the phenomenon of detachment and blowing when the gas used has a low flame spread speed. Then it is necessary that each burner rail is well ventilated, i.e. the burner flame must draw in enough air secondary to have a normal development without risk detachment. Finally, it is necessary that interignition between neighboring burner burners is done correctly so that even at low flow rates gas, all the ramps light up without difficulty.

Une réalisation classique de rampe de brûleur consiste à percer la grille de sortie de flamme d'une succession d'orifices en forme de fentes rectangulaires qui sont alignées les unes près des autres. La longueur de la bande couverte par les orifices délimite la longueur totale de la flamme obtenue. La surface couverte par la flamme correspond évidemment au produit de cette longueur totale par la largeur qui n'est autre que la longueur d'une fente. La flamme est ainsi concentrée et le front de flamme est délimité par le périmètre des fentes ainsi alignées. La surface de contact entre l'air et la flamme correspond à ce périmètre, ce qui limite l'entrée d'air de refroidissement ; de ce fait les parties de tôle voisines des fentes sont portées à haute température et soumises à des contraintes thermomécaniques ; la production de Nox liée à la température de la flamme n'est donc pas négligeable.A conventional embodiment of a burner ramp consists in piercing the flame outlet grid with a succession of orifices in the form of rectangular slots which are aligned close to one another. The length of the strip covered by the orifices defines the total length of the flame obtained. The surface covered by the flame obviously corresponds to the product of this total length by the width which is none other than the length of a slit. The flame is thus concentrated and the flame front is delimited by the perimeter of the slots thus aligned. The contact surface between the air and the flame corresponds to this perimeter, which limits the entry of cooling air; therefore the sheet metal parts adjacent to the slots are brought to high temperature and subjected to thermomechanical stresses; the production of No x linked to the flame temperature is therefore not negligible.

L'invention apporte une solution nouvelle dans l'arrangement des orifices de sortie de flammes, qui permet un accroissement du front de flamme en même temps qu'une réduction de son épaisseur, et qui va dans le sens d'une amélioration de la stabilité de la flamme, d'un meilleur refroidissement, et d'une émission réduite de Nox.The invention provides a new solution in the arrangement of the flame exit orifices, which allows an increase in the flame front at the same time as a reduction in its thickness, and which goes in the direction of improving stability. flame, better cooling, and reduced emission of No x .

L'invention a donc pour objet une rampe de sortie de flammes pour brûleur à gaz atmosphérique et à prémélange comportant une grille en tôle percée d'une succession de fentes rectangulaires, rampe selon laquelle les fentes sont réparties de part et d'autre de l'axe longitudinal de la grille et forment une sinusoïde s'étendant sur toute la longueur de la grille, qui augmente la longueur du front de flammes.The subject of the invention is therefore an exit ramp from flames for atmospheric and premix gas burner comprising a sheet metal grid pierced with a succession of rectangular slots, ramp along which the slots are distributed on either side of the longitudinal axis of the grid and form a sinusoid extending over the entire length of the grid, which increases the length of the front of flames.

Avantageusement les fentes sont espacées les unes des autres d'une distance constante selon l'axe de la grille.Advantageously, the slots are spaced apart others by a constant distance along the axis of the wire rack.

Selon une variante préférentielle de réalisation, les fentes sont identiques, chacune d'entre elles étant décalée par rapport à sa voisine immédiate.According to a preferred embodiment, the slots are identical, each of them being offset from its immediate neighbor.

D'autres variantes et d'autres avantages de l'invention seront mieux perçus à la lecture de la description suivante dans laquelle il est fait référence aux dessins annexés qui représentent :

  • Figure 1, une vue en plan d'une rampe de brûleur.
  • Figure 2, une vue en plan à plus grande échelle des fentes de la rampe selon la figure 1.
  • Figures 3 et 4 des vues en plan d'une variante de rampe de brûleur respectivement une vue d'ensemble et une vue à plus grande échelle.
  • Figures 5 et 6, des vues analogues d'une autre variante de rampe de brûleur.
    • Other variants and other advantages of the invention will be better perceived on reading the following description in which reference is made to the appended drawings which represent:
  • Figure 1, a plan view of a burner rail.
  • Figure 2, a plan view on a larger scale of the slots of the ramp according to Figure 1.
  • Figures 3 and 4 plan views of a variant of the burner ramp respectively an overview and an enlarged view.
  • Figures 5 and 6, similar views of another variant of the burner rail.

    • On voit à la figure 1 une grille de sortie de flamme formée d'une bande 1 en tôle dans laquelle sont découpées des fentes 2 qui sont réparties de part et d'autre de l'axe longitudinal 3 de la grille, et disposées en dentelle. La figure 2 fait apparaítre ces fentes 2 de forme générale rectangulaire. Les fentes sont identiques et espacées les unes des autres d'une distance e constante selon l'axe 3. Par contre, perpendiculairement à cet axe, chaque fente est décalée par rapport à sa voisine immédiate, d'une demi-longueur de fente ℓ/2. Cette demi-longueur ℓ /2 est préférentielle mais non obligatoire. Par exemple elle pourrait être variable entre ℓ/5 et ℓ/0,5. L'important est que les extrémités des fentes forment ainsi une sinusoïde de part et d'autre de l'axe 3 comme cela apparaít sur la partie gauche de la figure 1, cette sinusoïde s'étendant sur toute la longueur de la grille. Les fentes sont dimensionnées pour éviter les retours de flamme et le décollement ou le soufflage. Le décalage ainsi introduit entre les fentes, par rapport à un alignement classique, augmente la longueur du front de flamme, puisque celui-ci correspond à la sinusoïde des fentes.We see in Figure 1 a flame outlet grid formed of a sheet metal strip 1 from which are cut slots 2 which are distributed on either side of the longitudinal axis 3 of the grid, and arranged in lace. Figure 2 shows these slots 2 of general rectangular shape. The slots are identical and spaced from each other by a constant distance e along axis 3. On the other hand, perpendicular to this axis, each slot is offset from its neighbor immediate, with half a slot length demi / 2. This half length ℓ / 2 is preferable but not compulsory. Through example it could be variable between ℓ / 5 and ℓ / 0.5. The important thing is that the ends of the slots form thus a sinusoid on either side of axis 3 as it appears on the left side of figure 1, this sinusoid extending over the entire length of the grid. The slots are sized to prevent returns from flame and peeling or blowing. Lag thus introduced between the slots, relative to a conventional alignment, increases the length of the front flame, since this corresponds to the sinusoid of slots.

    Ce périmètre développé peut atteindre, voire dépasser trois fois la longueur du front de flamme d'une grille traditionnelle ce qui permet d'obtenir un taux d'air primaire élevé. De même la surface couverte par la flamme est sérieusement augmentée, jusqu'à six fois. Par contre l'épaisseur de la flamme est réduite de 70 %.This developed perimeter can reach, or even exceed three times the length of the flame front by one traditional grid which makes it possible to obtain a rate high primary air. Similarly, the area covered by the flame is seriously increased, up to six times. Through against the thickness of the flame is reduced by 70%.

    La flamme est ainsi "étirée" selon un cheminement sinusoïdal ayant un plus grand contact avec l'atmosphère environnante qui autorise un accès plus important à l'air secondaire, favorisant la combustion ainsi que le refroidissement. Le fait que la flamme soit plus courte permet de placer le brûleur plus près de l'échangeur de chaleur ce qui accroít son rendement et permet d'obtenir un appareil plus compact. De même les produits de combustion chauds sont refroidis et évacués plus rapidement. Du fait aussi qu'il y a davantage de surfaces de contact entre chaque fente et la partie métallique voisine, la répartition de température et le refroidissement du brûleur sont meilleurs. On a donc un échauffement supportable du métal constitutif des sorties de flamme. Puisqu'il y a moins de contraintes thermomécaniques, la durée de vie du brûleur s'en trouve augmentée.The flame is thus "stretched" along a path sinusoidal having greater contact with the atmosphere surrounding which allows greater access to air secondary, promoting combustion as well as cooling. The fact that the flame is shorter allows to place the burner closer to the heat exchanger heat which increases its yield and makes it possible to obtain a more compact device. Likewise the products of hot combustion are cooled and vented over quickly. Also because there are more surfaces of contact between each slot and the metal part the temperature distribution and the burner cooling are better. So we have a bearable heating of the metal constituting the outputs of flame. Since there are fewer constraints thermomechanical, the service life of the burner is increased.

    Grâce à cette disposition, on obtient une stabilité de flamme améliorée. Du fait de l'accroissement d'air secondaire, il y a élimination du CO et réduction de l'émission de Nox.Thanks to this arrangement, improved flame stability is obtained. Due to the increase in secondary air, there is elimination of CO and reduction of the emission of No x .

    Dans la variante de réalisation illustrée aux figures 3 et 4, les fentes 2 sont de longueur différentes. On trouve des fentes ayant une longueur L et des fentes plus courtes de longueur ℓ, ces dernières étant centrées sur l'axe 3. les fentes plus longues sont groupées par paire, en alternance avec les courtes et elles sont décalées alternativement de part et d'autre de l'axe. Les extrémités des fentes échelonnées le long de l'axe forment aussi une sinusoïde, mais moins régulière que celle de la figure 1.In the alternative embodiment illustrated in Figures 3 and 4, the slots 2 are of different length. There are slots having a length L and slots shorter of length ℓ, the latter being centered on axis 3. the longer slots are grouped by pair, alternating with the short ones and they are shifted alternately on either side of the axis. The ends of the slots staggered along the axis form also a sinusoid, but less regular than that of the figure 1.

    On retrouve aussi les deux longueurs de fente dans encore une autre variante de réalisation montrée aux figures 5 et 6. Dans ce cas la plupart des fentes sont décalées par rapport à l'axe 3 et l'échelonnement de leurs extrémités est moins prononcé que dans le cas précédent.We also find the two slot lengths in yet another alternative embodiment shown in Figures 5 and 6. In this case most of the slots are offset from axis 3 and the staggering of their extremities is less pronounced than in the previous case.

    Dans les deux cas les fentes gardent le même espacement e.In both cases the slots keep the same spacing e.

    Le bras de brûleur réalisé avec une grille de sortie de flamme de ce type se compose d'une coquille de forme classique dont les dimensions ont été optimisées pour obtenir un taux d'aération primaire proche de la stoechiométrie et une répartition uniforme du mélange air/gaz en sortie. A puissance maximum, les flammes obtenues ont la caractéristique principale d'être disposées en "dentelle" et d'offrir ainsi le maximum de surface de contact avec l'air environnant.The burner arm made with an outlet grid flame of this type consists of a shaped shell classic whose dimensions have been optimized for obtain a primary aeration rate close to stoichiometry and uniform distribution of the mixture air / gas outlet. At maximum power, the flames obtained have the main characteristic of being arranged in "lace" and thus offer the maximum of contact surface with surrounding air.

    Claims (6)

    1. A flame outlet strip for an atmospheric and premixing gas burner comprising a sheet metal bar pierced with a series of rectangular slots, the said slots (2) being distributed on each side of the longitudinal axis (3) of the bar, characterized in that the said slots form a sinusoid on both sides of the longitudinal axis (3) extending over the entire length of the bar, which increases the length of the flame front.
    2. A flame outlet strip according to claim 1, characterized in that the slots are spaced apart from each other by a constant distance e along the axis (3).
    3. A flame outlet strip according to claim 1, characterized in that the slots (2) are identical, each one of them being offset with respect to its immediate neighbour.
    4. A flame outlet strip according to claim 1, characterized in that the slots (2) have different lengths, long slots L being offset with respect to the axis (3), and short slots of length 1 remaining centred on the axis (3).
    5. A flame outlet strip according to claim 4, characterized in that the longer slots (2) are offset in pairs with respect to the axis (3).
    6. A flame outlet strip according to claim 1, characterized in that the slots (2) have different lengths and most of them are offset with respect to the axis (3).
    EP99401012A 1998-04-28 1999-04-26 Flamestrip for atmospheric and premixing gas burner Expired - Lifetime EP0953804B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9805295A FR2777978B1 (en) 1998-04-28 1998-04-28 FLAME OUTPUT RAMP FOR ATMOSPHERIC GAS AND PREMIX BURNER
    FR9805295 1998-04-28

    Publications (2)

    Publication Number Publication Date
    EP0953804A1 EP0953804A1 (en) 1999-11-03
    EP0953804B1 true EP0953804B1 (en) 2003-06-04

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    Application Number Title Priority Date Filing Date
    EP99401012A Expired - Lifetime EP0953804B1 (en) 1998-04-28 1999-04-26 Flamestrip for atmospheric and premixing gas burner

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    US (1) US6123543A (en)
    EP (1) EP0953804B1 (en)
    JP (1) JPH11337017A (en)
    AT (1) ATE242457T1 (en)
    DE (1) DE69908486D1 (en)
    FR (1) FR2777978B1 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE10053877B4 (en) * 2000-10-31 2004-10-07 Robert Bosch Gmbh Burner plate for a gas burner

    Family Cites Families (13)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2644515A (en) * 1947-12-22 1953-07-07 Rheem Mfg Co Gas burner head with secondary air feed grooves
    GB1255602A (en) * 1967-09-30 1971-12-01 Sutherland Ltd Ag Gas burners
    DE1816948A1 (en) * 1968-12-24 1970-06-25 Vaillant Joh Kg Bunsen burner
    US3780954A (en) * 1970-05-15 1973-12-25 Robertshaw Controls Co Burner construction
    DE2132968A1 (en) * 1970-07-04 1972-01-13 Guiseppe Fogliani Gas burner
    GB1414979A (en) * 1972-12-07 1975-11-26 Robinson D H Gas burners
    NL7508679A (en) * 1975-07-21 1977-01-25 Remeha Fabrieken Bv ATMOSPHERIC GAS BURNER.
    GB1473959A (en) * 1975-08-14 1977-05-18 Aeromatic Co Ltd Natural gas burners
    DE2629988A1 (en) * 1976-07-03 1978-01-05 Haller Meurer Werke Ag BOX-SHAPED BURNER TUBE FOR ALL-GAS BURNERS OF GAS HEATERS
    DE2966549D1 (en) * 1978-07-28 1984-02-23 Aldo Polidoro Atmospheric gas burner with groups of vents for the passage of the mixture of combustible gas and combustion air
    US5215457A (en) * 1990-01-24 1993-06-01 Worgas Bruciatori S.R.L. Combustion process and gas burner with low nox, co emissions
    AT399552B (en) * 1991-02-22 1995-06-26 Vaillant Gmbh BURNER
    DE19541801A1 (en) * 1995-11-09 1997-05-15 Bosch Gmbh Robert burner

    Also Published As

    Publication number Publication date
    ATE242457T1 (en) 2003-06-15
    FR2777978A1 (en) 1999-10-29
    DE69908486D1 (en) 2003-07-10
    JPH11337017A (en) 1999-12-10
    FR2777978B1 (en) 2000-06-16
    EP0953804A1 (en) 1999-11-03
    US6123543A (en) 2000-09-26

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