EP0840061B1 - Dispositif d'accrochage de flammes pour brûleur à gaz et brûleur muni d'un tel dispositif - Google Patents

Dispositif d'accrochage de flammes pour brûleur à gaz et brûleur muni d'un tel dispositif Download PDF

Info

Publication number: EP0840061B1
Authority: EP; European Patent Office
Prior art keywords: rings; stay; burner; ring; external diameter
Prior art date: 1996-11-04
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

Application number

EP97402491A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0840061A1 (fr

Inventor

William Guerin

Valérie Bosso

Bernard Verbeke

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.)

Engie SA

Original Assignee

Gaz de France SA

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1996-11-04

Filing date

1997-10-21

Publication date

2002-01-23

1997-10-21 Application filed by Gaz de France SA filed Critical Gaz de France SA

1998-05-06 Publication of EP0840061A1 publication Critical patent/EP0840061A1/fr

2002-01-23 Application granted granted Critical

2002-01-23 Publication of EP0840061B1 publication Critical patent/EP0840061B1/fr

2017-10-21 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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
- F23D14/46—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
- 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
- F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
- 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
- F23D2203/105—Porous plates
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2212/00—Burner material specifications
- F23D2212/20—Burner material specifications metallic
- F23D2212/201—Fibres
- 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 field of the invention is that of fastening devices for flames usable in particular on a cylindrical gas mixture burner.
These devices are generally made of various materials such as than ceramic or metal, and are finely perforated with size holes and suitable distribution to allow the passage of gases and a the most homogeneous combustion possible. They are typically arranged in the burner, between the mixture distribution and combustion chambers they separate
the invention aims in particular to allow a substantially uniform passage of gases over the entire surface of the device, with regular flame spread and good porosity, in order to reduce pressure drops and emissions of harmful or polluting gases.
US-A-3,144,073 describes a (single) ring constituted by a structure comprising a compressed network of flexible intermeshed metallic wires.
EP-A-0 635 677 describes the use of a trellis consisting of a compressed network of flexible metallic threads knitted for the gas flow through it.
the external diameter of the external spacer less than the diameter outer ring, forms an annular groove generating two zones of piloting on each side of each ring. On each of these two areas, a gas flow comes out perpendicular to the main flame which emerges on the outer periphery of the spacer, at the outlet of the groove.
the two gas flows are meet and form a pilot flame parallel to the main flame. This pilot flame develops at the exit of the throat and is detached from the edge of the spacer in order to obtain a homogeneous flame front with inter-ignition of flames.
the respective dimensions of the rings and annular spacers are defined to optimize the stabilization of the main flame by the pilot flame, while maintaining good inter-ignition.
the spacer will have a substantially internal diameter identical to the internal diameter of the ring.
the thickness of the spacer annular will be less than the thickness of the ring, the difference between the external radius and the internal radius of the annular spacer will be substantially equal to its thickness (substantially square or rectangular section), and the difference between the outer diameter of the ring and the outer diameter of the annular spacer will be substantially equal to the thickness of the spacer annular.
the best flame control the better flame front stability and maximum ventilation flexibility, while having low emissions of harmful or polluting gases.
the solution is to partially seal, preferably in a 4/5 ratio, the peripheral surface of these two rings where the flame develops main to release only one piloting area (representing the fraction a fifth remaining).
the solution is to have the hanging device on the downstream ring flame, a non-porous circular blanking plate made of material resistant to high temperatures (above 1000 ° C).
the blanking plate will have an external diameter substantially equal to the diameter outer of a ring and a thickness such that it does not curl under the effect heat.
the invention is proposes to solve the problem of the removable fixing of the device hanging flames on the burner.
These removable fastening means preferably have the form of a threaded rod axially passing through the flame attachment device and connected to the burner by lugs and to the blanking plate with a nut.
These means may also be made up several threaded rods arranged on an imaginary circle, the diameter will be close to the internal diameter of the device and coming to connect directly the burner to the cover plate (without legs).
these means may still be placed outside the device and take the form of flanges.
a fifth consideration is concerned with the centering of the ring (s) and annular spacer (s) to obtain a perfectly axially aligned stack.
the solution is to provide the annular spacer of centering pins, preferably at least eight, staggered on either side of the thickness of the spacer.
These lugs are integral, in particular by welding, with the internal walls of the spacer and are distributed around the internal periphery thereof, preferably at 90 ° from each other.
the invention also relates to a cylindrical burner of the type general gas mixture, comprising a distribution chamber of the mixture supplied with combustion air and combustible gas, communicating with a combustion chamber, with interposition between them of the device according to the invention.
the device of the invention can be used in particular for domestic burners (of a few tens of kilowatts of power nominal), for example with total air / gas premix and blue flame, making possible in particular a large power modulation, which can, for example, range from about 5 to 25 kilowatts, or a modulation of power of 1: 5.
the device of the invention can also be used for collective boilers (a few hundred kilowatts of power nominal) by adapting the size of the burner to the required power. In these different cases, the outer diameter of the rings will be chosen according to the size of the combustion chamber.
a ring 2 here perfectly circular, of diameter external D2, with internal diameter d2 and thickness E2, and has an axis main or normal axis symbolized by the letters yy '.
This type of ring is manufactured and sold by the company TISSMETAL (Reims, FRANCE). It's clear that the ring can take all possible forms (square, triangle, star, ellipse ...) along a plane P perpendicular to its normal axis yy ', the shape circular (both on its external and internal perimeter) being preferred.
the ring 2 comprises, in its constitution, a network of flexible metallic wire (s), with interlaced parts, leaving between it passages 4 (or openings) formed by the meshes "knitting" and through which the gases will circulate. It is quite possible to make the network with intertwined parts by knitting one (or more) yarn (s) or by weaving several threads perpendicular to each other (weft threads) by compared to the others (son of chain). This network of wire (s), or interlacing, is presented here as a knitted work consisting of at least one thread.
this knitted work is made with a single yarn 6 made up of a flexible metallic material which is easy to knit, such as for example "304L" stainless steel from 1 to 3 tenths of a millimeter in diameter.
a flexible metallic material which is easy to knit
the material used to make the device should preferably keep its characteristics (mechanical in particular) until high temperatures, from around 1000 ° C to 1200 ° C.
Figure 3 shows a device flame attachment 1 in which we find inserted between two 2 consecutive rings, an annular spacer 20 made of a material non-porous metal.
This spacer 20 has an internal diameter d20 substantially equal to the internal diameter d2 of the ring 2 and a diameter outer D20 smaller than the outer diameter D2 of said ring 2.
the dimensions of this annular spacer 20 are very important.
the spacer 20 is preferably provided with several means 21 for centering the rings 2, taking the form of lugs (21a, 21b, ...) welded on either side of the thickness E20 thereof on its internal diameter d20.
FIG. 4 shows, seen from above, a spacer 20 provided with eight centering pins (21a, 21b, ...) divided into two groups of four pins arranged on either side of the thickness E20 thereof, preferably arranged at 90 °, the two groups being staggered (45 ° offset) one relative to each other as shown.
Each group of four centering means defines a virtual ring of external diameter D21 substantially equal to the internal diameter d20 of the spacer 20 and the diameter internal d2 of ring 2 so that it comes to center on the spacer 20.
the thickness E21 of these pins will be small, of the order of a few millimeters, so as to create a good centering without interfering with the circulation of gases through passages 4 of the device 1.
the internal diameter d21 of the two virtual rings defined by lugs 21a and 21b will be slightly smaller than the external diameter D21 to avoid excessive disturbance the gas flow.
FIG. 5 shows the covering means 132 and 232 of a upstream ring 102 and a downstream ring 202, the latter being the last ring of the stack or the ring arranged furthest downstream with respect to the direction of gas circulation, symbolized by the letters AM (upstream) and AV (downstream).
AM upstream
AV downstream
these covering means 132 and 232 become useless.
These recovery means 132 and 232 consist of by a first strapping 132 disposed around the upstream ring 102, and a second strapping 232 disposed around the downstream ring 202.
each strapping 132 and 232 will have a thickness E132 and E232 such that it will cover approximately four-fifths (4/5) of the thickness of each upstream 102 and downstream 202 rings so as to allow good steering of flame.
These straps 132 and 232 will have an internal diameter d132 and d232 slightly greater than the outer diameter D2 of the rings 102 and 202, and a external diameter D132 and D232 slightly greater than their internal diameter d132 and d232. They will also be made of a non-porous material preferably resistant to temperatures above 1000 ° C.
Figure 5 also shows the sealing means 24 and fixing 25 of the flame attachment device 1, in an alternative embodiment where the device 1 is made up of several rings 2 and several spacers 20 inserted between two consecutive rings 2 (by measuring clarity, a single spacer 20 is shown between a ring 2 and the ring downstream 202).
These shutter means 24 consist of a plate terminal 26 circular and solid, preferably resistant to temperatures higher than 1000 ° C.
This end plate 26 is disposed on the ring downstream 202 and is fixed, for example by welding, by means of covering 232 of the downstream ring 202. In this way, the gases are forced to pass to the through the flame attachment device 1, therefore through the passages 4 defined by the compressed mesh of knitted yarn (s).
the diameter D26 of the end plate 26 will preferably be substantially equal to the external diameter D2 of the downstream ring 202, and its thickness E26 will be sufficient to prevent the end plate 26 from curling under the effect of the heat.
the fixing means 25 are represented by a threaded rod 27 passing axially through the center of the flame catching device 1 and the end plate 26, legs 28 and 29 which are fixed on the burner and a nut 30 coming to tighten the end plate 26 on the burner 80.
the rings 2 are slightly compressed between the end plate 26 and the burner 80, and are fixed thereto removable.
the flame attachment device 1 can therefore be easily replaced, or even a single ring 2 or a single spacer 20.
FIG. 6 there is shown a device 1, mounted in a known type of burner, referenced in its together in 80, such as a domestic premix burner total and blue flame.
This burner 80 essentially comprises a distribution 81, which has the general shape of a truncated cone box, substantially circular section, connected at its most rear side narrow 81a to separate supply lines 83, 84 respectively combustion air and combustible gas.
the acronyms AM and AV allow to locate the "upstream” and “downstream” sides of the burner respectively, with reference to the circulation of the combustible mixture, in the burner, such as shown diagrammatically by arrows 87, 87 'and 88.
This distribution chamber 81 is separated from a combustion chamber 82, on its front face, by the device flame attachment 1.
this device is under the form of several superimposed rings 2 and fixed to the burner 80 by fastening means 25 such as a threaded rod 27, tabs 28 and 29 and a nut 30.
the flame catching device 1 is closed, on a ring downstream 202, by a rigid non-porous plate 26 through which can insert the threaded rod 27.
the ring downstream 202 is formed by this single ring 2 and the end plate 26 is disposed on this ring 2.
the pipe 84 fuel gas supply line meets the supply line 83 air just upstream of the distribution chamber (at 85).
the ignition of the burner is ensured by an electrode 97 suitably insulated and supplied with high voltage by a cable power supply not shown, ignition taking place by sparks or arc between the tip 97a of the electrode and, for example, the neighboring wall a spacer or a ring.
the air factor ( n ) obtained in a gas burner with a nominal power of 25 kW fitted with the device according to the invention varies from 1.15 to 1.45 without an annular spacer, and from 1.16 to 1 , 62 with annular spacer, while it varies from 1 to 1.29 for a standard burner with a nominal power of 31 kW.
FIG. 7 shows, in detail, the flame front obtained by the assembly consisting of flame attachment device and the burner associated with FIG. 6.
a groove 40 making the device tour is defined, opposite the spacer 20.
These jets are parallel to the axis yy 'and are directed towards each other. If the dimensions of the spacer are correct chosen, then these two gas jets will meet in throat 40 and create a pilot flame F 'perpendicular to the axis yy' and detached from the slice of the spacer.
This pilot flame F ensures the stabilization and the homogeneity of the flame front F, avoiding any rupture thereof in ring / spacer contact areas. It develops as much flame pilot F 'that there is a spacer. Preferably, there will be no spacer between the burner and the upstream ring 102, nor beyond the downstream ring 202. Thanks to the additional space freed up between the rings 2 by the spacers 20, we can thus reduce the number of rings, which is favorable for the reduction the cost of the burner.

Landscapes

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

EP97402491A 1996-11-04 1997-10-21 Dispositif d'accrochage de flammes pour brûleur à gaz et brûleur muni d'un tel dispositif Expired - Lifetime EP0840061B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR9613402A FR2755500B1 (fr)	1996-11-04	1996-11-04	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
FR9613402		1996-11-04

Publications (2)

Publication Number	Publication Date
EP0840061A1 EP0840061A1 (fr)	1998-05-06
EP0840061B1 true EP0840061B1 (fr)	2002-01-23

Family

ID=9497288

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP97402491A Expired - Lifetime EP0840061B1 (fr)	1996-11-04	1997-10-21	Dispositif d'accrochage de flammes pour brûleur à gaz et brûleur muni d'un tel dispositif

Country Status (9)

Country	Link
US (1)	US5989015A (pt)
EP (1)	EP0840061B1 (pt)
AT (1)	ATE212428T1 (pt)
CA (1)	CA2220410C (pt)
DE (1)	DE69710023T2 (pt)
DK (1)	DK0840061T3 (pt)
ES (1)	ES2171862T3 (pt)
FR (1)	FR2755500B1 (pt)
PT (1)	PT840061E (pt)

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1996
- 1996-11-04 FR FR9613402A patent/FR2755500B1/fr not_active Expired - Lifetime
1997
- 1997-10-21 PT PT97402491T patent/PT840061E/pt unknown
- 1997-10-21 DK DK97402491T patent/DK0840061T3/da active
- 1997-10-21 ES ES97402491T patent/ES2171862T3/es not_active Expired - Lifetime
- 1997-10-21 DE DE69710023T patent/DE69710023T2/de not_active Expired - Lifetime
- 1997-10-21 AT AT97402491T patent/ATE212428T1/de active
- 1997-10-21 EP EP97402491A patent/EP0840061B1/fr not_active Expired - Lifetime
- 1997-10-30 US US08/961,227 patent/US5989015A/en not_active Expired - Lifetime
- 1997-11-03 CA CA002220410A patent/CA2220410C/en not_active Expired - Lifetime

Also Published As

Publication number	Publication date
US5989015A (en)	1999-11-23
DE69710023D1 (de)	2002-03-14
CA2220410A1 (en)	1998-05-04
FR2755500B1 (fr)	1998-12-11
DK0840061T3 (da)	2002-04-22
ATE212428T1 (de)	2002-02-15
EP0840061A1 (fr)	1998-05-06
FR2755500A1 (fr)	1998-05-07
DE69710023T2 (de)	2002-08-22
PT840061E (pt)	2002-06-28
CA2220410C (en)	2007-06-19
ES2171862T3 (es)	2002-09-16

Publication	Publication Date	Title
EP0840061B1 (fr)	2002-01-23	Dispositif d'accrochage de flammes pour brûleur à gaz et brûleur muni d'un tel dispositif
EP0334736B1 (fr)	1993-03-03	Brûleurs à gaz
EP0223691B1 (fr)	1989-05-31	Brûleur à gaz à air soufflé
CA2478876C (fr)	2012-04-24	Systeme d'injection air/carburant ayant des moyens de generation de plasmas froids
EP0945679B1 (fr)	2003-06-04	Brûleur à gaz pour appareils de cuisson
EP0604279A1 (fr)	1994-06-29	Injecteur avec paroi poreuse pour chambre de combustion d'une fusée
FR2925657A1 (fr)	2009-06-26	Dispositif et procede pour stabiliser la pression et le debit d'un melange gazeux alimentant un bruleur cylindrique a combustion de surface
EP1845306B1 (fr)	2019-03-27	Brûleur à gaz pour four de cuisine
FR2481415A1 (fr)	1981-10-30	Bruleur a gaz
FR2772887A1 (fr)	1999-06-25	Bruleur a faible emission d'oxyde d'azote avec circuit de gaz recycle
EP0397561B1 (fr)	1993-09-29	Tête de coupe à jet d'oxygène
EP0635677B1 (fr)	1998-05-06	Plaque d'accrochage de flamme pour brûleur à gaz, son procédé de fabrication et brûleur comprenant une telle plaque
FR2720284A1 (fr)	1995-12-01	Dispositif pare-flammes.
FR2526919A1 (fr)	1983-11-18	Bruleur a combustion en surface alimente totalement en air primaire
EP0549415A1 (fr)	1993-06-30	Brûleur à gaz à grille de combustion, son procédé de combustion, et installation de chauffage comprenant un tel brûleur
CA2152397A1 (fr)	1994-07-21	Buse de chalumeau a gaz
FR2654190A1 (fr)	1991-05-10	Bruleur pour combustible gazeux.
FR2686397A1 (fr)	1993-07-23	Tube a flammes pour un bruleur, notamment pour des combustibles liquides.
EP0660039B1 (fr)	1999-04-28	Tête de combustion perfectionnée pour brûleur à gaz, brûleur équipé d'une telle tête et procédé de combustion
FR2509436A1 (fr)	1983-01-14	Bruleur a canaux annulaires pour la combustion simultanee et separee de plusieurs combustibles
FR2745891A1 (fr)	1997-09-12	Bruleur atmospherique a gaz a premelange total
EP0679838A1 (fr)	1995-11-02	Perfectionnements aux brûleurs à gaz
FR2773388A1 (fr)	1999-07-09	Procede et dispositif pour la combustion de combustible solide pulverise
EP0565442A1 (fr)	1993-10-13	Paroi de chambre de combustion
CA3223831A1 (fr)	2023-11-09	Bruleur a gaz a combustion de surface antideflagrant et antidetonant

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