EP0635677B1 - Plaque d'accrochage de flamme pour brûleur à gaz, son procédé de fabrication et brûleur comprenant une telle plaque - Google Patents
Plaque d'accrochage de flamme pour brûleur à gaz, son procédé de fabrication et brûleur comprenant une telle plaque Download PDFInfo
- Publication number
- EP0635677B1 EP0635677B1 EP19940401586 EP94401586A EP0635677B1 EP 0635677 B1 EP0635677 B1 EP 0635677B1 EP 19940401586 EP19940401586 EP 19940401586 EP 94401586 A EP94401586 A EP 94401586A EP 0635677 B1 EP0635677 B1 EP 0635677B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- mesh
- constituted
- strip
- compressed
- 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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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
- F23D14/46—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
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/101—Flame diffusing means characterised by surface shape
- F23D2203/1012—Flame diffusing means characterised by surface shape tubular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/103—Flame diffusing means using screens
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/00019—Outlet manufactured from knitted fibres
Definitions
- the invention relates to a plate flame attachment, usable in particular on gas mixture burners.
- They are made of various materials, such than ceramic or metal, and are usually drilled orifices of suitable size and distribution for allow the passage of gases and their combustion. They are arranged in the gas burner between the distribution and combustion, which they separate.
- Such pierced plates still pose problems related to their mounting because they are in fact often made up of several thin plates which must be stacked on top of each other in the burner. That poses adjustment problems between plates and armature a high installation cost.
- the object of the invention is to resolve these difficulties thanks to a flame attachment plate improved, notably allowing stabilization efficient and good distribution of the flames over its entire surface, with formation of a flame front substantially uniform, further promoting risk reduction back from flames.
- the plate according to the invention drives a relatively low pressure drop of around 35 to 50 Pa and promotes limitation of the quantities of gas emitted harmful (oxides of carbon, nitrogen, ).
- the proposed solution consists of a plate with passages crossing it for traffic at through it gases to be burned, the plate of the invention is characterizing in that the wire network (s) looks like a tube flattened knitted fabric comprising one or more sections.
- the invention allows in particular, by its structure or texture in yarn (s) to intertwined parts, a passage substantially uniformly gas distributed over the entire surface of the plate, with even spread of the flame created, making it possible in practice (for example in the case of installations heating), advantageously reduce the spacing between the flame attachment zone and the heat exchanger heat often associated with the burner, since the front of flame may be of relatively low height.
- the invention also relates to a burner of the general gas mixture type, comprising a distribution supplied with combustion air and gas fuel, communicating with a combustion chamber, with interposition between them of the plate according to the invention.
- the plate of the invention can be used in particular for domestic burners, such as, for example, blown air, total premix and blue flame, making possible in particular a large modulation in power, which can, for example, go from '' about 3 to 33 kilowatts, or a power modulation of 1: 11, with a pfd which can range from 225 to 2500 kw / cm 2 , approximately.
- domestic burners such as, for example, blown air, total premix and blue flame
- a large modulation in power which can, for example, go from '' about 3 to 33 kilowatts, or a power modulation of 1: 11, with a pfd which can range from 225 to 2500 kw / cm 2 , approximately.
- this distribution plate or sieve can be shaped by example with a substantially circular section (Figure 1) or rectangular parallelepiped (figure 10), with dimensions adapted to those of the associated burner.
- the plate includes, in its constitution, a network 2 of wire (s) flexible (s) 12, with intertwined or entangled parts, providing between them passages 27 or channels passing through the plate for the circulation through it of gases.
- a network 2 of wire (s) flexible (s) 12 with intertwined or entangled parts, providing between them passages 27 or channels passing through the plate for the circulation through it of gases.
- This network of wire (s) or interlacing 2 presents itself here as a knitted work 10 consisting of at least one thread flexible.
- this knitted work is made in one single wire 12 extending continuously between its ends free 12a and 12b ( Figure 2).
- This wire can be made in a ductile metallic material which is easily knitted, such as, for example, two-tenths "304L" stainless steel millimeter in diameter.
- the material used to make the plate should preferably keep its characteristics (mechanical in particular) up to high temperatures, around 1000 ° C to 1200 ° C.
- the wire 12 is sort of "knitted", like knitting a sock, so as to constitute the work 10, which advantageously have the form of a tube.
- FIG. 3 the diagram is illustrated way in which loops 19 in " ⁇ " (OMEGA) of wire 12 can be intertwined, delimiting meshes 14, of suitable dimensions.
- These meshes (corresponding to passages 27 above) being advantageously relatively initially loose, the mesh produced can be easily distorted in different directions at the start of the shaping of the plate.
- Figure 4 shows more precisely the interlacing of the sections or parts 15 of the wire, which overlap each other, presenting areas interlacing as referenced in 17, these sections forming "upper" loops 19a which pass through the loops below them 19b, thus delimiting the passages 27.
- these passages of the knitted work in a state relatively loose, these same passages being found distributed throughout the network structure in the state tablet according to shape, size and function layout compression forces exerted.
- a knitted work 10 in the form of a cylindrical tube ( Figure 2), deformable and compressible.
- This tube is first of all flattened or flattened along two fold lines 16, 18, both substantially parallel to the longitudinal axis 20 of this tube, the knitted work then having the general shape of a strip 21 of double thickness .
- the strip obtained is then wound on itself, from one of its ends 21a.
- FIG. 6 it can be seen that the roll 22 formed, of axis 25 substantially perpendicular to the longitudinal axis 46 of the strip, is advantageously produced by tightening the strip well when it is wound on itself.
- This winding 22 is then compressed substantially uniformly along its axis 25, in the direction of the arrows F a and F ' a , and possibly in the case where this compression along the axis 25 is insufficient, also perpendicularly to this axis 25 in the direction of the arrows Fr, until the compressed network constituting the desired plate is obtained such as that of FIG. 1, which compressed network preserves between its parts of wire (s) the passages, although deformed, intended for the circulation of gases .
- the axial compression will first be applied, then, if necessary, the radial compression. It will be noted that here the compression is therefore carried out substantially parallel and perpendicular to the surface of the plate thus formed.
- the plate, whose orifices 27 for the passage of gases will thus be randomly distributed over its entire surface, will in particular allow effective self-stabilization of the flame.
- FIG 7 Another possibility of achieving this plate is shown in Figure 7, for example to obtain the plate in the form of a substantially quadrilateral in Figure 10. In this case, we can still start from the flattened tubular strip 21 which is then folded on itself to form at least one fold line 32.
- the strip is folded several times on itself in a stacking direction of the folds 45 in the manner of an accordion, constituting a series of folds of which only the upper fold has been referenced at 42 , the folds can be arranged substantially parallel to the plane 30 of the plate thus formed.
- This fold 40 is then compressed, being advantageously subjected to a first compression substantially along the stacking axis 45 of the folds in the direction of the arrows F a and F ' a , then if desired a second compression, substantially perpendicular to this same axis 45, in the direction of the arrows F l .
- the plate 1 is constituted by a stack 40a of sections 42a precut from the strip 21, all of dimensions substantially equal, this stack then being compressed substantially parallel, and incidentally, perpendicular to the stacking axis 45a of these sections.
- the parts or sections 42a of the stacked strip will be oriented substantially parallel to the plane 30 of the plate, the axis 45a being then substantially perpendicular to this plane.
- the dimensions of the structure knitted 10, as well as roll 22 of folding 40, or the stack 40a will be adapted so that, after compression, the dimensions of the plate correspond substantially to that of the associated burner.
- a flame attachment plate circular in shape
- a metal band (not shown) can keep the plate at its around.
- the compressions of the shaped work in view of obtaining the plate according to the invention, can be produced using a small known type press.
- a plate 1 mounted in a burner of known type, referenced as a whole in 80, as by example a domestic air blower, premixed total and blue flame.
- This burner 80 essentially comprises a distribution chamber 81, which has the general shape of a box in truncated cone, substantially in section circular, connected at its most rear side narrow 81a with separate supply lines 83, 84 in combustion air and combustible gas respectively.
- This distribution chamber 81 is delimited transversely, on its front face, by the plate flame attachment 1.
- this plate is present in the form of a substantially circular disc, mounted in a hoop 90 whose dimensions are adapted to those of the burner to which it is attached by all means known to those skilled in the art, the plate being arranged substantially perpendicular to the axis 86 of the chamber 81 so as to separate the latter from the combustion 82.
- the letters AV and AR allow to locate the sides "front” and “rear” of the burner, with reference to the circulation of the fuel mixture, in the burner, as shown by arrows 87, 87 'and 88.
- the fuel gas supply line 84 meets the air supply duct 83 just in upstream of the distribution chamber (at 85).
- a fan upstream of the duct 83 pressurized air supply.
- the ignition of the burner is provided by an electrode 97 suitably insulated and supplied with high voltage, by a power cable not shown, ignition taking place by sparks or electric arc between the tip 97a of the electrode and, by example, the wall next to the plate (if the latter is metallic) or the wall of the combustion, or even the grid 1 itself.
- the screened structure or plate 1 in stainless steel reference "304L" may have a diameter of about 130 mm and a thickness about 15 mm to be installed in a burner servant of which the distribution chamber is made up a truncated cone about 95 mm high.
- the maximum pressure drop created by the combustion head 1 is relatively small, of the order of 50 Pa, the maximum temperature at the output 1a of the plate 1 at the stoichiometry being 750 ° C; moreover, there was no noise pollution notable.
- the plate according to the invention can as well be mounted on gas premix burners only on burners without premix.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Description
tout d'abord, la stabilisation des flammes par ces plaques qui n'est pas toujours satisfaisante. On tente alors d'améliorer quelque peu cette stabilité, par exemple en adaptant la trajectoire des jets de mélange, ou encore en prévoyant une grille supplémentaire ou tamis de répartition des gaz à l'intérieur de la chambre de répartition ; cela entraíne notamment des coûts supplémentaires et rend les installations plus complexes. Or, cette instabilité des flammes peut également générer des dysfonctionnements tels que des retours possibles de flammes à l'intérieur de la chambre de répartition, ou encore des productions excessives de gaz nocifs. Par ailleurs, la structure même des plaques existantes rend souvent difficile une modulation importante de la puissance du brûleur.
- on met en forme un réseau d'au moins un fil à parties entrelacées, pour qu'il présente la forme générale d'une plaque, ledit fil résistant à des températures de l'ordre de 1000°C à 1200°C environ,
- et on comprime ce réseau de telle manière que le réseau comprimé conserve, entre ses parties de fil, les passages prévus pour la circulation des gaz.
- les figures 1 et 10 montrent, en perspective, deux exemples d'une plaque d'accrochage de flamme conforme à l'invention ;
- la figure 2 montre schématiquement en perspective, un exemple de réalisation de l'ouvrage tricoté à partir duquel peut être obtenue la plaque des figures 1 et 10 ;
- la figure 3 montre un détail de réalisation de l'ouvrage tricoté de la figure 2, à l'endroit du repère III de cette figure ;
- la figure 4 illustre, à plus grande échelle, une possible réalisation de l'entrelacs du réseau ;
- les figures 5 et 6 présentent, en perspective, deux étapes d'un principe possible de réalisation de la plaque de la figure 1, à partir de l'ouvrage tricoté de la figure 2 ;
- la figure 7 présente, toujours en perspective, un autre principe possible de mise en oeuvre de l'ouvrage tricoté ;
- la figure 8 montre, en perspective, une variante supplémentaire de mise en oeuvre de l'ouvrage tricoté ; et
- la figure 9 présente, en coupe verticale médiane, une utilisation possible de la plaque de l'invention, sur un brûleur à mélange de gaz (chauffe-eau par exemple).
PLAQUE CERAMIQUE (A) | PLAQUE SELON INVENTION (B) | |||||||
P (kW) | n | Co | NOx | CnHm | n | Co | NOx | CnHm |
31,4 (pour A) | 1,00 | 476 | 332 | 0 | 1,02 | 10 | 320 | 0 |
1,05 | 25 | 337 | 1 | 1,22 | 0 | 95 | 0 | |
1,15 | 0 | 163 | 0 | 1,30 | 0 | 66 | 0 | |
32,9 (pour B) | 1,23 | 0 | 104 | 0 | 1,34 | 0 | 43 | 0 |
1,29 | 0 | 65 | 0 | 1,40 | 0 | 29 | 0 | |
11,9 | 1,02 | 7400 | 171 | 0 | 1,02 | 30 | 181 | 0 |
1,06 | 164 | 240 | 0 | 1,06 | 2 | 193 | 0 | |
1,12 | 7 | 137 | 0 | 1,12 | 0 | 150 | 0 | |
1,20 | 2 | 94 | 0 | 1,20 | 0 | 92 | 0 | |
1,26 | 15 | 85 | 3 | 1,28 | 0 | 83 | 0 | |
1,37 | 124 | 44 | 30 | 1,47 | 29 | 63 | 24 | |
3,3 | 1,02 | 6250 | 33 | 3 | 1,08 | 346 | 25 | 0 |
1,04 | 470 | 36 | 4 | 1,12 | 51 | 21 | 4 | |
1,14 | 17 | 28 | 3 | 1,25 | 13 | 15 | 0 | |
1,26 | 37 | 22 | 5 | 1,41 | 5 | 27 | 9 | |
1,40 | 204 | 15 | 48 | 1,58 | 225 | 8 | 2324 | |
1,58 | 675 | 10 | 2450 | 1,73 | 650 | 6 | 3940 |
Claims (10)
- Plaque d'accrochage de flamme (1) pour brûleur à mélange de gaz comprenant au moins un fil (12) souple métallique définissant un réseau (2) maillé comprimé autorisant la circulation de gaz à travers lui, caractérisée en ce que le réseau (2) de fil(s) (12) se présente comme un tube tricoté aplati (10) comprenant un ou plusieurs tronçons.
- Plaque selon la revendication 1, caractérisé en ce que le (chaque) tronçon de tube (10) comprend un unique fil (12).
- Plaque d'accrochage de flamme selon l'une quelconque des revendications 1 à 2, caractérisée en ce qu'elle est constituée par un enroulement (22) sur elle-même de la bande (21) que constitue ledit tube aplati (10), l'axe (25) de l'enroulement étant sensiblement perpendiculaire à l'axe longitudinal (46) de la bande (21).
- Plaque d'accrochage de flamme selon l'une quelconque des revendications 1 à 2, caractérisée en ce qu'elle est constituée par un empilement (40a) de plusieurs tronçons (42a) de la bande (21) que constitue ledit tube aplati (10), suivant une direction donnée (45a) d'empilement des tronçons (42a).
- Plaque d'accrochage de flamme selon l'une quelconque des revendications 1 à 2, caractérisée en ce qu'elle est constituée par un pliage (40) sur elle-même de la bande (21) que constitue ledit tube aplati (10), suivant une direction donnée (45) d'empilement des plis.
- Brûleur à gaz du type à mélange de gaz comprenant une chambre de répartition (81) alimentée en air comburant et en gaz combustible et communiquant avec une chambre de combustion (82), avec interposition entre elles d'une plaque d'accrochage de flamme (1) selon l'une quelconque des revendications précédentes.
- Procédé de fabrication d'une plaque d'accrochage de flamme (1) pour brûleur à mélange de gaz comprenant au moins un fil (12) souple métallique définissant un réseau (2) maillé comprimé autorisant la circulation de gaz à travers lui, caractérisé en ce que :on réalise un réseau (2) de fil(s) à parties entrelacées définissant un tube tricoté (10), constitué d'au moins un fil (12) souple métallique résistant à des températures de l'ordre de 1000°C à 1200°C environ,on aplatit ledit tube tricoté (10) selon des lignes de pliures (16 et 18) sensiblement parallèles à son axe longitudinal (20), pour obtenir un réseau aplati (2),on met en forme ce réseau aplati (2) pour qu'il présente la forme générale d'une plaque (1),et on comprime le réseau (2) ainsi mis en forme, de telle manière que, dans un état comprimé, il autorise la circulation de gaz à travers lui.
- Procédé selon la revendication 7, caractérisé en ce que pour mettre en forme ledit réseau (2), on enroule sur elle-même la bande (21) que constitue ledit tube aplati (10), l'enroulement (22) formé étant comprimé sensiblement suivant son axe (25) et/ou sensiblement perpendiculairement par rapport à cet axe (25).
- Procédé selon la revendication 7, caractérisé en ce que pour mettre en forme ledit réseau (2), on plie au moins une fois sur elle-même la bande (21) que constitue ledit tube aplati (10), suivant une direction donnée (45) d'empilement des plis, le pliage (40) obtenu étant comprimé suivant une (des) direction(s) sensiblement parallèle et/ou perpendiculaire à ladite direction (45) d'empilement des plis.
- Procédé selon la revendication 7, caractérisé en ce que pour mettre en forme ledit réseau (2), on découpe en tronçons (42a) la bande (21) que constitue ledit tube aplati (10), lesquels tronçons sont empilés les uns sur les autres suivant une direction donnée (45a) d'empilement des tronçons, l'empilement (40a) obtenu étant comprimé suivant une (des) direction(s) sensiblement parallèle et/ou perpendiculaire à ladite direction (45a) d'empilement des tronçons.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9308827 | 1993-07-19 | ||
FR9308827A FR2708083B1 (fr) | 1993-07-19 | 1993-07-19 | Plaque d'accrochage de flamme pour brûleur à gaz, son procédé de fabrication et brûleur comprenant une telle plaque. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0635677A1 EP0635677A1 (fr) | 1995-01-25 |
EP0635677B1 true EP0635677B1 (fr) | 1998-05-06 |
Family
ID=9449355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940401586 Expired - Lifetime EP0635677B1 (fr) | 1993-07-19 | 1994-07-08 | Plaque d'accrochage de flamme pour brûleur à gaz, son procédé de fabrication et brûleur comprenant une telle plaque |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0635677B1 (fr) |
DE (1) | DE69410030T2 (fr) |
ES (1) | ES2115894T3 (fr) |
FR (1) | FR2708083B1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2755500B1 (fr) | 1996-11-04 | 1998-12-11 | Gaz De France | Dispositif d'accrochage de flammes modulable pour bruleur a melange de gaz peu polluant a flamme auto-stabilisee, et bruleur muni d'un tel dispositif |
IT1312222B1 (it) * | 1999-03-22 | 2002-04-09 | Siabs Industry S R L | Dispositivo di riscaldamento ad irraggiamento in particolare perambienti esterni. |
FR2792394B1 (fr) | 1999-04-16 | 2001-07-27 | Gaz De France | Procede pour realiser une surface d'accrochage de flammes |
DE10233340B4 (de) * | 2002-07-23 | 2004-07-15 | Rational Ag | Porenbrenner sowie Gargerät, enthaltend mindestens einen Porenbrenner |
ES2312746T3 (es) * | 2003-12-18 | 2009-03-01 | Riello S.P.A. | Elemento de recubrimiento para cabezas de combustion de gas y quemador de gas que comprende tal elemento de recubrimiento. |
EP1715247A1 (fr) * | 2005-04-19 | 2006-10-25 | Paul Scherrer Institut | Brûleur |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1429149A1 (de) * | 1962-12-14 | 1969-01-09 | Matsushita Electric Ind Co Ltd | Strahlungsbrenner |
JPS58205012A (ja) * | 1982-05-25 | 1983-11-29 | Iwao Harayama | 多孔通気板 |
SU1090423A1 (ru) * | 1983-01-10 | 1984-05-07 | Предприятие П/Я Р-6603 | Огнепреградитель дл быстрогор щих смесей |
US4657506A (en) * | 1984-12-10 | 1987-04-14 | Glowcore Corporation | Gas burner |
-
1993
- 1993-07-19 FR FR9308827A patent/FR2708083B1/fr not_active Expired - Lifetime
-
1994
- 1994-07-08 ES ES94401586T patent/ES2115894T3/es not_active Expired - Lifetime
- 1994-07-08 DE DE1994610030 patent/DE69410030T2/de not_active Expired - Fee Related
- 1994-07-08 EP EP19940401586 patent/EP0635677B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2708083B1 (fr) | 1995-09-01 |
DE69410030T2 (de) | 1999-02-11 |
ES2115894T3 (es) | 1998-07-01 |
DE69410030D1 (de) | 1998-06-10 |
EP0635677A1 (fr) | 1995-01-25 |
FR2708083A1 (fr) | 1995-01-27 |
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