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EP3017098B1 - Brûleur de gaz pré-mélangé - Google Patents

Brûleur de gaz pré-mélangé Download PDF

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Publication number
EP3017098B1
EP3017098B1 EP14735913.7A EP14735913A EP3017098B1 EP 3017098 B1 EP3017098 B1 EP 3017098B1 EP 14735913 A EP14735913 A EP 14735913A EP 3017098 B1 EP3017098 B1 EP 3017098B1
Authority
EP
European Patent Office
Prior art keywords
burner
deck
burner deck
woven
zone
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.)
Active
Application number
EP14735913.7A
Other languages
German (de)
English (en)
Other versions
EP3017098A1 (fr
Inventor
Wilhelm Salvatore VAN DEN BERG
Eric Heuveling
Geert Folkers
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.)
Bekaert Combustion Technology BV
Original Assignee
Bekaert Combustion Technology BV
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.)
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Publication date
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Priority to EP14735913.7A priority Critical patent/EP3017098B1/fr
Publication of EP3017098A1 publication Critical patent/EP3017098A1/fr
Application granted granted Critical
Publication of EP3017098B1 publication Critical patent/EP3017098B1/fr
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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
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/18—Water-storage heaters
    • F24H1/186—Water-storage heaters using fluid fuel
    • 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
    • F23D2203/1017—Flame diffusing means characterised by surface shape curved
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/102—Flame diffusing means using perforated 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 invention relates to gas premix burners that have a woven, knitted or braided burner deck comprising metal fibers.
  • gas premix burner can e.g. be used in boilers or in instantaneous water heaters.
  • Gas premix burners with a knitted or woven fabric comprising metal fibers as burner deck positioned on a perforated plate or woven screen (a woven wire mesh) which is acting as gas distribution plate are known. It is a benefit of such burners that the burner deck (e.g. a knitted or woven fabric) can freely expand when hot, while the perforated plate or the woven wire mesh is remaining sufficiently cool.
  • Such burners are e.g. known from WO2012/152571 , US4657506 and WO2004/092647 .
  • WO94/14608 discloses a porous laminate comprising a metal wire mesh of mutually crossing wires to which is bonded a non-woven web of metal fibers sintered to one another under pressure, in which the porosity of the membrane in the region of the junctions of the mesh is at most 40 % of the porosity in the central zones of the mesh openings between said junctions, along with a method for fabricating this laminate.
  • WO94/14608 mentions that if high temperature resistant fibers - such as FeCrAlloy fibers - are utilized, the sintered laminates can be used as a flat or tube-shaped membrane for surface radiation burners.
  • the primary object of the invention is to provide an improved gas premix burner.
  • a first aspect of the invention is a gas premix burner comprising:
  • the zone with a high density has a density of at least 1350 g/dm 3 , more preferably of at least 1400 g/dm 3 , more preferably of at least 1450 g/dm 3 , more preferably of at least 1500 g/dm 3 , more preferably of at least 1750 g/dm 3 , even more preferably of at least 2000 g/dm 3 . And preferably below 3500 g/dm 3 , more preferably below 2500 g/dm 3 .
  • the value of the density for a burner deck can be set by compressing a fabric to a specific thickness for use as burner deck.
  • the zone with a high density is not connected via metal bonds to the perforated plate, woven wire mesh or expanded metal sheet supporting the woven, knitted or braided burner deck.
  • boilers in which heat is generated by a burner can show thermo acoustical instabilities. The result is noise that can be very irritating.
  • air is fed by a fan and mixed with combustible gas, e.g. by means of a venturi, and introduced in a premixing chamber after which the premix of gas and air is combusted after flowing through a porous burner deck.
  • the hot flue gas transfers its thermal energy to a fluid in a heat exchanger after which the flue gas is evacuated through a chimney.
  • the combination of parts of the boiler results in it that noise is generated, e.g. by the gas flow through the fan.
  • the presence of the flame can amplify any noise that is present, from a level that the noise is not audible up to levels that are very annoying.
  • Noise is a standing wave.
  • the flame is not constant over time.
  • the short term fluctuations in the flame can coincide with the frequency of the noise resulting in amplification of the standing waves (and consequently of the noise).
  • This process is called thermo-acoustic instability.
  • the burner needs to be operated over a certain load range and also in a range of the air to gas ratio. This creates a large range of possible conditions of operation of the boiler, that each need to be sufficiently silent in operation, meaning that acoustic instabilities should be sufficiently low over the full range of modulation of the burner.
  • the interactions between the different parameters are believed to be extremely complex and not understood.
  • the gas premix burners of the invention have shown to have substantially less thermo acoustic instabilities than prior art gas premix burners.
  • the use of knitted burner decks is preferred, because it allows manufacturing of burners with a more complex double-curved burner deck shape.
  • the knitted burner deck can be using spun yarns comprising metal fibers of discrete length, using metal multifilament yarns, or using metal monofilaments.
  • the woven, knitted or braided burner deck comprises a zone or zones with a density less than the density of the zone with high density.
  • the zone or zones with density less than the density of the zone with high density has a density lower than 1100 g/dm 3 , preferably lower than 1000 g/dm 3 , but preferably higher than 800 g/dm 3 , more preferably higher than 900 g/dm 3 .
  • the zone or zones with density less than the density of the zone with high density cover at least 20%, more preferably at least 30%, even more preferably at least 40% of the surface of the burner deck.
  • a burner deck with zones of different densities can be obtained by different levels of compression of different zones of the fabric that is used for the burner deck.
  • Embodiments with zones with different densities have shown to provide synergistic benefits, in that the presence of such zones of the burner deck with lower density than the density of the zone with high density further reduces acoustic instabilities.
  • one or more sections of the burner deck of the gas premix burner are double curved; and the zone or zones of the burner deck with density less than the density of the zone with high density, comprise at least part of, and preferably in full, the one or more sections of the burner deck that are double curved.
  • a surface is at a point on it double curved, there is at that point no direction in which the radius of curvature at that point is infinite.
  • a cylindrical burner is a burner that has a single curved surface.
  • a sphere is an object that is double curved over its full surface. This preferred embodiment allows easy production of double curved burners according to the invention.
  • knitted burner decks are preferred as knitted fabrics allow more easily setting different levels of density by different levels of compression of the knitted fabric that will be used as burner deck.
  • the zone with a high density does not cover points of the burner deck that have a smallest radius of curvature of less than 5 mm, preferably of less than 8 mm.
  • a smallest radius of curvature of less than 5 mm, preferably of less than 8 mm.
  • many radii of curvature can be defined; each of them is associated with a particular cut according to a plane containing the normal line to the burner deck at the point under consideration. The intersection of this plane with the burner deck results in a trajectory.
  • the radius of curvature is the radius of the circle in the intersecting plane, which osculates to second order the trajectory at the point under consideration. Out of all these possible planes, containing the normal line through the point under consideration, with associated trajectories and radii of curvature, the smallest radius can be determined for each position of the burner deck.
  • the zone or zones of the burner deck with density less than the density of the zone with high density comprise the circumference of the burner deck. Such burners have shown better results.
  • the burner deck comprises a zone with a density lower than 900 g/dm 3 , preferably lower than 750 g/dm 3 .
  • the burner comprises an ionization electrode and /or an ignition electrode, and a zone with a density lower than 900 g/dm 3 (and preferably lower than 750 g/dm 3 ) is provided at the location of the ionization electrode and/or at the location of the ignition electrode.
  • the zone with a density lower than 900 g/dm 3 (and preferably lower than 750 g/dm 3 ) covers less than 20%, more preferably less than 10%, of the surface of the burner deck.
  • the burner deck has over its full surface a constant density.
  • the burner deck has a mass per unit of area larger than 1000 g/m 2 , preferably larger than 2000 g/m 2 and preferably smaller than 2750 g/m 2 .
  • fabrics that can be used for the burner deck are knitted fabrics with a specific weight of 1250 g/m 2 or 1400 g/m 2 or 2400 g/m 2 .
  • the burner deck has over its full surface a constant mass per unit of area
  • the burner deck is not over its full surface bonded to the perforated plate, woven wire mesh or expanded metal sheet supporting the burner deck.
  • the burner deck is bonded locally, e.g. via spot or line welding, to the perforated plate, woven wire mesh or expanded metal sheet supporting the burner deck.
  • the burner deck is bonded to the perforated plate, woven wire mesh or expanded metal sheet at edge zones of the burner deck, and preferably only bonded at the edge zones of the burner deck.
  • the burner deck is soft welded over at least part of its surface to the perforated plate, woven wire mesh or expanded metal sheet.
  • the soft welding is performed over at least 50% of surface of the burner deck, more preferably over at least 75% of its surface, and even more preferably substantially over its full surface or over its full surface.
  • the soft welding is performed (e.g. by means of capacitor discharge welding) such that when pulling the woven, knitted or braided burner deck from the perforated plate, woven wire mesh or expanded metal sheet, the soft welded bonds between the woven, knitted or braided burner deck and the perforated plate, woven wire mesh or expanded metal sheet are broken rather than that breakage in the woven, knitted or braided burner deck occurs.
  • the test method to determine that the burner deck is soft welded, is pulling in peel-off mode: an edge portion of the burder deck is removed from the perforated plate, woven wire mesh or expanded metal sheet, and folded over 180°. Pulling the burner deck is then done by hand or using pliers, wherein the pulling force is exerted parallel with the perforated plate, woven wire mesh or expanded metal sheet, in a direction of 180° to the burner deck.
  • the force builds up until the burner deck is progressively peeled off from the supporting perforated plate, woven wire mesh or expanded metal sheet leaving no metal fibers of the burner deck on the supporting perforated plate, woven wire mesh or expanded metal sheet (indicating that soft welding occurred); or until progressively destroying the burner deck at least partly wherein metal fibers of the burner deck remain attached to the supporting perforated plate, woven wire mesh or expanded metal sheet (indicating that no soft welding occurred).
  • the conclusion whether or not the burner deck is soft-welded to the supporting perforated plate, woven wire mesh or expanded metal sheet is independent of further parameters. Such embodiments have shown further improvement in the reduction of thermo-acoustical instabilities.
  • the benefits of using a woven, knitted or braided burner deck comprising metal fibers are maintained.
  • the benefits are that when the burner is in use the woven, knitted or braided burner deck can freely expand; and the perforated plate, the woven wire mesh or the expanded metal sheet remains sufficiently cool.
  • the woven, knitted or braided burner deck comprises or consists out of spun yarns, which comprise metal fibers of discrete length.
  • the woven, knitted or braided burner deck comprises yarns comprising or consisting out of metal filaments. With filament is meant a fiber of virtually infinite length.
  • the yarns comprising metal filaments can be metal multifilament yarns or can be metal monofilament yarns.
  • the burner deck is one layer of a woven, knitted or braided fabric, placed on the perforated plate, woven wire mesh or expanded metal sheet.
  • the burner deck is knitted, woven or braided using yarns comprising or consisting out of a plurality of metal filaments or metal staple fibers in the cross section, or using yarns consisting out of metal monofilaments.
  • the surface of the woven, knitted or braided burner deck at the other side than the side of the perforated plate, woven wire mesh or expanded metal sheet is not covered by another metallic object, such that the surface of the woven, knitted or braided burner deck is, when the burner is in use, the surface on which combustion takes place.
  • metal fibers are stainless steel fibers.
  • a specifically preferred range of stainless steel fibers are chromium and aluminium comprising stainless steel fibers as in DIN 1.4767, e.g. as are known under the trademark FeCrAlloy.
  • Preferred are metal fibers with equivalent diameter of less than 50 ⁇ m, more preferably of less than 40 ⁇ m. With equivalent diameter of a fiber is meant the diameter of a circle with the same surface area as the cross sectional area of that fiber.
  • Preferred metal fibers for use in the invention e.g. stainless steel fibers, with an equivalent diameter less than 50 micrometer or less than 40 micrometer, e.g. less than 25 micrometer, can be obtained by a bundle drawing technique.
  • This technique is disclosed e.g. in US-A-2050298 , US-A-3277564 and in US-A-3394213 .
  • Metal wires are forming the starting material and are covered with a coating such as iron or copper.
  • a bundle of the covered wires is subsequently enveloped in a metal pipe. Thereafter the thus enveloped pipe is reduced in diameter via subsequent wire drawing steps to come to a composite bundle with a smaller diameter.
  • the subsequent wire drawing steps may or may not be alternated with an appropriate heat treatment to allow further drawing.
  • the initial wires have been transformed into thin fibers which are embedded separately in the matrix of the covering material.
  • a bundle preferably comprises not more than 2000 fibers, e.g. between 500 and 1500 fibers.
  • the covering material can be removed e.g. by solution in an adequate leaching agent or solvent.
  • the result is a bundle of metal fibers.
  • metal fibers for use in the invention such as stainless steel fibers, can be manufactured in a cost effective way by machining a thin plate material. Such a process is disclosed e.g. in US-A-4930199 .
  • a strip of a thin metal plate is the starting material. This strip is wound a number of times around a rotatably supported main shaft and is fixed thereto.
  • the main shaft is rotated at constant speed in a direction opposite to that in which the plate material is wound.
  • a cutter having an edge line extending perpendicularly to the axis of the main shaft is fed at constant speed.
  • the cutter has a specific face angle parallel to the axis of the main shaft.
  • the end surface of the plate material is cut by means of the cutter.
  • Yet an alternative way of producing metal fibers for use in the invention is via extraction or extrusion from a melt of a metal or metal alloy.
  • Another alternative way of producing metal fibers for use in the invention is machining fibers from a solid block of metal.
  • Yarns, comprising or consisting out of metal fibers, for the production of the knitted fabric, the braided fabric or the woven fabric for use in the invention can e.g. be spun from stretch broken fibers (such as bundle drawn stretch broken fibers) and/or can e.g. be yarns made from shaved or machined fibers.
  • the yarns can be plied yarns, e.g. two ply, three ply...
  • Preferred fabrics made from metal fibers have a mass per unit of area of between 0.6 and 3 kg/m 2 ; preferably between 0.7 and 3 kg/m 2 , even more preferred between 1.2 and 2.5 kg/m 2 .
  • the knitted fabric, the braided fabric or the woven fabric can also comprise metal monofilaments.
  • the knitted fabric, the braided fabric or the woven fabric can e.g. be produced out of metal monofilaments.
  • the knitted fabric, the braided fabric or the woven fabric has a mass per unit of area between 0.6 and 1.3 kg/m 2 , more preferably between 0.6 and 0.9 kg/m 2 .
  • the gas premix burner of the invention is suited for use in a boiler or water heater.
  • the second aspect of the invention is a boiler or water heater comprising a gas burner as in the first aspect of the invention.
  • Figure 1 shows an example of a gas premix burner 100 of the invention.
  • the gas premix burner 100 has a single-curved knitted burner deck.
  • the knitted fabric consists out of spun stainless steel fiber yarns knitted into a fabric.
  • the knitted burner deck 110 is supported by a perforated metal plate 130.
  • the knitted burner deck 110 has two zones with different densities.
  • a zone with a lower density can be foreseen at an ionization electrode. It is also possible to provide the burner with a burner deck of uniform density equal to the density of the zone 140 of high density of the burner 100 of figure 1 .
  • Table I summarizes the results of trials with the burner of figure 1 . All trials have been performed with the same burner geometries (except for modifying the knitted burner deck as indicated in table I) and with a uniform density of the knitted burner deck. Table I: Results for burner decks with a constant density A B C 1400 1000 Thermo-acoustic instabilities present during normal operation 2400 1200 Thermo-acoustic instabilities present during normal operation 1400 1273 Thermo-acoustic instabilities only present during start-up sequence.
  • FIG 2 shows an example of a gas premix burner 200 according to the invention with a burner deck comprising double curved sections.
  • the burner 200 comprises a knitted metal fiber yarn burner deck 210 supported by a woven metal wire mesh (not shown on figure 2 ) and a metal plate 235.
  • Figures 3 and 4 show the cross sections of the burner 200 along lines III-III and IV-IV respectively.
  • Figures 3 and 4 show the woven metal wire mesh 330, 430 supporting the knitted metal fiber yarn burner deck 310, 410 and the plate 335, 435 welded along the edges of the knitted metal fiber yarn burner deck 310, 410 to the knitted metal fiber yarn burner deck 310, 410.
  • FIG. 5 shows the knitted metal fiber yarn fabric 510 that is used for the burner deck of the burner shown in figure 2 .
  • the fabric 510 shows sections with different density.
  • a first section consists out of zones 541 of high density.
  • a second section consists out of zones 551 with density less than the density of the zones 541 with high density.
  • An optional zone 560 can be present with density lower than 900 g/dm 3 (e.g.
  • Table II summarizes the results of trials performed on the burner shown in figures 2 - 5 , compared to the same burner geometry and a prior art knitted burner deck.
  • Table II Results for burner deck with different density levels A B C D 1400 1400 950 Much less TA instabilities present; less risk of TA instabilities when disturbing factors occur 2400 1714 950 Much less TA instabilities present; less risk of TA instabilities when disturbing factors occur 1400 2333 950 No TA instabilities, minimized risk of occurrence of TA instabilities when disturbing factors occur 2400 3000 950 No TA instabilities, minimized risk of occurrence of TA instabilities when disturbing factors occur A: Mass per unit of surface area of knitted burner deck (g/m 2 ); B: Density (g/dm 3 ) of the zone with high density; C: Density (g/dm 3 ) of the zone with density less than the zone with high density; D: Observation of thermo-acoustic (TA) instabilities.
  • TA thermo-acoustic
  • FIG 6 shows another example of a gas premix burner according to the invention with double-curved sections.
  • the burner 600 comprises a knitted metal fiber yarn burner deck 610 supported by a woven metal wire mesh 630 and a metal plate 635.
  • Figures 7 and 8 show the cross sections of the burner 600 along lines VII-VII and IV-IV respectively.
  • Figures 7 and 8 show the woven metal wire mesh 730, 830 supporting the knitted metal fiber yarn burner deck 710, 810 and the plate 735, 835 welded along the edges of the knitted metal fiber yarn burner deck 710, 810 to the knitted metal fiber yarn burner deck 710, 810.
  • This welding operation creates a weld between the metal plate 735, 835 and the knitted metal fiber yarn burner deck 310, 410 and through the applied heat at the same locations also between the knitted metal fiber yarn burner deck 310, 410 and its supporting woven metal wire mesh 730, 830.
  • the burner deck 610 has a central zone 642 where it is single curved and two end sections 652 where it is double curved.
  • a knitted metal fiber fabric of 1400 g/m 2 is used as burner deck. In a first example of this burner, the density of the burner deck was constant over its complete surface, 1500 g/dm 3 .
  • the density of the burner deck at the two double curved end sections 652 and at the transition into the single curved central zone 642 is 950 g/dm 3 .
  • the density of the burner deck in the central zone is 1700 g/dm 3 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Gas Burners (AREA)
  • Woven Fabrics (AREA)
  • Knitting Of Fabric (AREA)

Claims (14)

  1. Brûleur à prémélange de gaz (100, 200, 600) comprenant :
    - une plaque perforée, un treillis en fil tissé ou une tôle métallique étirée (130, 330, 430, 630, 730, 830) ;
    - un plancher de brûleur tissé, tricoté ou tressé (110, 210, 310, 410, 510, 610, 710, 810) comportant des fibres métalliques, supportées par ladite plaque perforée, le treillis en fil tissé ou la tôle métallique étirée ;
    caractérisé en ce que ledit plancher de brûleur tissé, tricoté ou tressé comporte au moins une zone (140, 541) présentant une densité élevée d'au moins 1250 g/dm3 ; dans lequel la zone présentant une densité élevée comprend au moins 25 % de la surface du plancher de brûleur.
  2. Brûleur à prémélange de gaz selon la revendication 1, dans lequel le plancher de brûleur tissé, tricoté ou tressé comporte des fils filés qui comprennent des fibres métalliques de longueur discrète.
  3. Brûleur à prémélange de gaz (100) selon l'une quelconque des revendications précédentes,
    dans lequel ledit plancher de brûleur tissé, tricoté ou tressé comprend une zone (160) ou des zones (560, 551) présentant une densité inférieure à la densité de ladite zone présentant une densité élevée (140, 541).
  4. Brûleur à prémélange de gaz (200, 600) selon la revendication 3,
    dans lequel une ou plusieurs sections (652) dudit plancher de brûleur sont doublement incurvées ; et dans lequel ladite zone ou lesdites zones du plancher de brûleur présentant une densité inférieure à la densité de ladite zone présentant une densité élevée, comprennent au moins une partie, et de préférence la totalité, de ladite ou desdites sections du plancher de brûleur qui sont doublement incurvées.
  5. Brûleur à prémélange de gaz selon les revendications 3 et 4, dans lequel ladite zone ou lesdites zones du plancher de brûleur présentant une densité inférieure à la densité de ladite zone présentant une densité élevée, comprennent la circonférence du plancher de brûleur.
  6. Brûleur à prémélange de gaz selon l'une quelconque des revendications précédentes, dans lequel ladite zone présentant une densité élevée ne recouvre pas des points du plancher de brûleur qui présentent un rayon de courbure inférieur à 5 mm.
  7. Brûleur à prémélange de gaz (100) selon l'une quelconque des revendications précédentes, dans lequel ledit plancher de brûleur comprend une zone ou des zones présentant une densité inférieure à 900 g/dm3 ; et, de préférence, ledit brûleur comprenant une électrode d'ionisation (170) et/ou une électrode d'allumage et dans lequel une zone (160) présentant une densité inférieure à 900 g/dm3 est disposée à l'emplacement de ladite électrode d'ionisation et/ou à l'emplacement de ladite électrode d'allumage.
  8. Brûleur à prémélange de gaz selon les revendications 1 ou 2, dans lequel ledit plancher de brûleur présente sur sa surface complète une densité constante.
  9. Brûleur à prémélange de gaz selon les revendications 1 à 8, dans lequel ledit plancher de brûleur présente sur sa surface complète une masse constante par unité de surface.
  10. Brûleur à prémélange de gaz selon l'une quelconque des revendications précédentes, dans lequel ledit plancher de brûleur n'est pas, sur sa surface complète, lié à ladite plaque perforée, au dit treillis en fil tissé ou à ladite tôle métallique étirée.
  11. Brûleur à prémélange de gaz selon les revendications 1 à 10, dans lequel ledit plancher de brûleur est lié localement, par exemple par le biais d'un soudage par points ou linéaire, à ladite plaque perforée, audit treillis en fil tissé ou à ladite tôle métallique étirée.
  12. Brûleur à prémélange de gaz selon les revendications 1 à 11, dans lequel ledit plancher de brûleur est lié à ladite plaque perforée, audit treillis en fil tissé ou à ladite tôle métallique étirée au niveau de zones périphériques dudit plancher de brûleur.
  13. Brûleur à prémélange de gaz selon les revendications 1 à 9, dans lequel ledit plancher de brûleur est soudé à l'étain sur au moins une partie de sa surface à ladite plaque perforée, audit treillis en fil tissé ou à ladite tôle métallique étirée ;
    un soudage tendre signifie un soudage tel que, lorsqu'on retire le plancher de brûleur tissé, tricoté ou tressé de la plaque perforée, du treillis en fil tissé ou de la tôle métallique étirée, les liaisons entre le plancher de brûleur tissé, tricoté ou tressé et la plaque perforée, le treillis en fil tissé ou la tôle métallique étirée sont rompues plutôt qu'une rupture du plancher de brûleur tissé, tricoté ou tressé ne se produise.
  14. Chaudière ou chauffe-eau comprenant un brûleur à prémélange de gaz selon les revendications 1 à 13.
EP14735913.7A 2013-07-02 2014-07-01 Brûleur de gaz pré-mélangé Active EP3017098B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14735913.7A EP3017098B1 (fr) 2013-07-02 2014-07-01 Brûleur de gaz pré-mélangé

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13174661 2013-07-02
EP14735913.7A EP3017098B1 (fr) 2013-07-02 2014-07-01 Brûleur de gaz pré-mélangé
PCT/EP2014/063902 WO2015000869A1 (fr) 2013-07-02 2014-07-01 Brûleur à prémélange de gaz

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EP3017098B1 true EP3017098B1 (fr) 2019-06-05

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US (1) US20160123580A1 (fr)
EP (1) EP3017098B1 (fr)
CN (1) CN105339539B (fr)
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WO (1) WO2015000869A1 (fr)

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WO2019011736A1 (fr) 2017-07-13 2019-01-17 Bekaert Combustion Technology B.V. Brûleur à prémélange gazeux
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WO2019011738A1 (fr) 2017-07-13 2019-01-17 Bekaert Combustion Technology B.V. Brûleur à gaz de prémélange
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PL3434976T3 (pl) * 2017-07-28 2020-10-19 Polidoro S.P.A. Jednostka palnika
WO2019021039A1 (fr) 2017-07-28 2019-01-31 Polidoro S.P.A. Unité de brûleur
WO2019201600A1 (fr) 2018-04-19 2019-10-24 Bekaert Combustion Technology B.V. Brûleur à gaz de prémélange
EP3572728B1 (fr) * 2018-05-22 2022-04-06 Bekaert Combustion Technology B.V. Brûleur de gaz pré-mélangé
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Publication number Publication date
CN105339539B (zh) 2018-07-06
TR201910322T4 (tr) 2019-07-22
US20160123580A1 (en) 2016-05-05
WO2015000869A1 (fr) 2015-01-08
EP3017098A1 (fr) 2016-05-11
CN105339539A (zh) 2016-02-17

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