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EP0840061A1 - Flammenhalter für Gasbrenner und Brenner mit einem solchen Flammenhalter - Google Patents

Flammenhalter für Gasbrenner und Brenner mit einem solchen Flammenhalter Download PDF

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Publication number
EP0840061A1
EP0840061A1 EP97402491A EP97402491A EP0840061A1 EP 0840061 A1 EP0840061 A1 EP 0840061A1 EP 97402491 A EP97402491 A EP 97402491A EP 97402491 A EP97402491 A EP 97402491A EP 0840061 A1 EP0840061 A1 EP 0840061A1
Authority
EP
European Patent Office
Prior art keywords
rings
spacer
ring
burner
diameter
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
EP97402491A
Other languages
English (en)
French (fr)
Other versions
EP0840061B1 (de
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.)
Filing date
Publication date
Application filed by Gaz de France SA filed Critical Gaz de France SA
Publication of EP0840061A1 publication Critical patent/EP0840061A1/de
Application granted granted Critical
Publication of EP0840061B1 publication Critical patent/EP0840061B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 that they separate.
  • the invention therefore relates to a device for hooking flames allowing to provide a solution to at least some of these disadvantages, while keeping manufacturing conditions at low cost.
  • the solution consists of a flame hanging device for a gas mixture burner comprising in its structure a network of flexible metallic wire (s) interleaved for circulation through it of said gases, characterized in that it has the shape of a ring.
  • a first additional consideration focused on the ease of manufacture of said flame hanging device. Indeed, it is more difficult to make a thick ring (30 mm and more) than a thin ring. However, the device must be able to adapt to large burners (collective heating).
  • the solution recommended is to axially superimpose at least two rings, preferences with the same dimensions (internal diameter, external diameter and thickness), in order to obtain an annular device of the dimension desired.
  • a second consideration was to improve the aeration flexibility (variation of the air factor n) and the stability of the flame, to limit the manufacturing costs and to overcome the problem of separation of the flame in the case of strong aeration. for axially superimposed rings.
  • the solution adopted proposes to insert, between two consecutive rings, an annular spacer made of non-porous metallic material preferably resistant to temperatures above 1000 ° C.
  • said spacer will have an internal diameter substantially identical to the internal diameter of the ring. In this way, an additional heating surface is freed between each ring, which makes it possible to reduce the number of rings, more expensive to manufacture than the annular spacers.
  • this insertion of spacers allows better flame control.
  • annular spacers have the effect of clearly improving the distribution of the flame front and the ventilation flexibility (variation of the air factor n ) by creating what is called an "inter-ignition" of the flames between them.
  • the dimensions of the annular spacers are optimally defined, and in particular as a function of the dimensions of the ring, the two gas flows meet and form a pilot flame parallel to the main flame.
  • This pilot flame develops at the outlet of the groove and is detached from the edge of the spacer in order to obtain a homogeneous flame front with inter-ignition of the flames.
  • the respective dimensions of the rings and the annular spacers are defined to optimize the stabilization of the main flame by the pilot flame, while retaining good inter-ignition.
  • 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.
  • a fourth consideration focused on solving the problem piloting the first (upstream) and the last (downstream) ring of the stack.
  • 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 sixth consideration was 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.
  • this device for hooking flames for gas mixture burner, according to the invention, identified in as a whole by the reference 1.
  • this device in the form of 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 device 1 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.
  • FIG. 3 shows a variant of the invention in which the device consists of several identical circular rings 2, superimposed on each other along a main axis of symmetry yy ' (also called stacking axis).
  • This configuration provides a device 1 of greater thickness, which would be difficult to achieve with single piece.
  • Figure 4 shows an alternative embodiment of the 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. 5 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.
  • Figure 6 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 6 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. 7 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. 8 shows, in detail, the flame front obtained by the assembly consisting of flame attachment device and the burner associated with FIG. 7.
  • 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.

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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)
EP97402491A 1996-11-04 1997-10-21 Flammenhalter für Gasbrenner und Brenner mit einem solchen Flammenhalter Expired - Lifetime EP0840061B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9613402 1996-11-04
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

Publications (2)

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

Family

ID=9497288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97402491A Expired - Lifetime EP0840061B1 (de) 1996-11-04 1997-10-21 Flammenhalter für Gasbrenner und Brenner mit einem solchen Flammenhalter

Country Status (9)

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

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DE102005044494B3 (de) * 2005-09-16 2007-03-08 Wenzel, Lothar Vorrichtung zur Beseitigung von schädlichen Bestandteilen aus Abgasen von Brennkraftmaschinen

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JPS58205012A (ja) 1982-05-25 1983-11-29 Iwao Harayama 多孔通気板
GB2231949A (en) * 1989-05-26 1990-11-28 Burco Dean Appliances Ltd Gas burner
EP0635677A1 (de) 1993-07-19 1995-01-25 Gaz De France Flammenhalterplatte für Gasbrenner, Verfahren zu seiner Herstellung und Brenner mit einer solchen Platte
EP0636837A2 (de) * 1993-07-26 1995-02-01 General Electric Company Zweistufige Flammenstabilisation für Gasbrenner

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144073A (en) * 1961-02-28 1964-08-11 Ronald D Corey Burners
JPS58205012A (ja) 1982-05-25 1983-11-29 Iwao Harayama 多孔通気板
GB2231949A (en) * 1989-05-26 1990-11-28 Burco Dean Appliances Ltd Gas burner
EP0635677A1 (de) 1993-07-19 1995-01-25 Gaz De France Flammenhalterplatte für Gasbrenner, Verfahren zu seiner Herstellung und Brenner mit einer solchen Platte
EP0636837A2 (de) * 1993-07-26 1995-02-01 General Electric Company Zweistufige Flammenstabilisation für Gasbrenner

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004016987A1 (de) 2002-07-23 2004-02-26 Rational Ag Porenbrenner sowie gargerät, enthaltend mindestens einen porenbrenner
DE10233340A1 (de) * 2002-07-23 2004-03-04 Rational Ag Porenbrenner sowie Gargerät, enthaltend mindestens einen Porenbrenner
DE10233340B4 (de) * 2002-07-23 2004-07-15 Rational Ag Porenbrenner sowie Gargerät, enthaltend mindestens einen Porenbrenner
DE102005044494B3 (de) * 2005-09-16 2007-03-08 Wenzel, Lothar Vorrichtung zur Beseitigung von schädlichen Bestandteilen aus Abgasen von Brennkraftmaschinen

Also Published As

Publication number Publication date
PT840061E (pt) 2002-06-28
FR2755500A1 (fr) 1998-05-07
DK0840061T3 (da) 2002-04-22
CA2220410C (en) 2007-06-19
US5989015A (en) 1999-11-23
FR2755500B1 (fr) 1998-12-11
ES2171862T3 (es) 2002-09-16
EP0840061B1 (de) 2002-01-23
ATE212428T1 (de) 2002-02-15
DE69710023D1 (de) 2002-03-14
DE69710023T2 (de) 2002-08-22
CA2220410A1 (en) 1998-05-04

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