EP3064831A1 - Gasbrenner für ein heizgerät - Google Patents

Gasbrenner für ein heizgerät Download PDF

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Publication number
EP3064831A1
EP3064831A1 EP16153084.5A EP16153084A EP3064831A1 EP 3064831 A1 EP3064831 A1 EP 3064831A1 EP 16153084 A EP16153084 A EP 16153084A EP 3064831 A1 EP3064831 A1 EP 3064831A1
Authority
EP
European Patent Office
Prior art keywords
burner
frame portion
diffuser layer
edges
transversal
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.)
Withdrawn
Application number
EP16153084.5A
Other languages
English (en)
French (fr)
Inventor
Massimo Gilioli
Gabriele GANGALE
Tullio PALTRINIERI
Paolo GILLI
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.)
Beckett Thermal Solutions SRL
Original Assignee
Worgas Bruciatori SRL
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 Worgas Bruciatori SRL filed Critical Worgas Bruciatori SRL
Publication of EP3064831A1 publication Critical patent/EP3064831A1/de
Withdrawn legal-status Critical Current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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D91/00—Burners specially adapted for specific applications, not otherwise provided for
    • F23D91/02—Burners specially adapted for specific applications, not otherwise provided for for use in particular heating operations
    • 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
    • F23D14/12—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
    • F23D14/26—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
    • 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
    • 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
    • F23D14/84—Flame spreading or otherwise shaping
    • 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
    • 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
    • F23D2203/103—Flame diffusing means using screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/106—Assemblies of different layers

Definitions

  • the present invention relates to a burner for a gas heater.
  • Gas heaters of the prior art comprise a combustion chamber with a heat exchanger, a burner either connected to or inside the combustion chamber for producing heat by combusting a mixture of fuel gas and combustion supporting air within the combustion chamber, a feeding pipe for feeding the gas and air mixture to the burner, as well as a frame for supporting and connecting the burner to the combustion chamber.
  • the diffuser layer consists of a wall with a plurality of through openings.
  • a wall may be a perforated sheet, a fabric, a mesh (for brevity, meshes and fabrics will be indicated hereinafter by the term "meshes") or a porous or perforated wall of ceramic material.
  • a distributor may be provided upstream of the diffuser layer (with reference to the flow direction of the gas-air mixture) with the aim of distributing the mixture in a desired manner towards the diffuser wall.
  • the known distributors are generally made as walls with a plurality of through openings, e.g. made of a perforated sheet, and which may form an "inner" layer of the combustion membrane or, alternatively, a component spaced apart from the combustion membrane.
  • the heat produced by the combustion is carried by means of the hot combustion gases (by convection) and by means of thermal radiation to the heat exchanger for heating a fluid, e.g. water, which is then conveyed to a user, e.g. to a heating system of an industrial process, of living spaces or the like and/or of sanitary water.
  • a fluid e.g. water
  • the heater For a targeted, safe use of the heater, it is desirable to control and be able to vary in a controlled manner the heating power of the burner and the local and total flow rate of the fuel mixture through the combustion membrane.
  • the flow rate of the fuel mixture affects flame temperature, combustion membrane temperature, overall thermal power, and flame stability, but regretfully even the onset of undesired instability phenomena and detachment of the flame from the combustion surface.
  • flame stability In addition to the local flow rate of the fuel mixture, flame stability also depends on the local temperature of the combustion membrane, which local temperature is, in turn, affected by geometry and weight distribution in the combustion membrane and in the supporting frame. For this reason, combustion membranes are often made of metal meshes or fabrics which facilitate a tridimensional, double-curvature shaping.
  • the perforated sheet may be easily folded about a single axis (or about multiple parallel axes), a shaping with curvature about several non-parallel axes results in a stretching on the plane of the sheet with uncontrollable, unrepeatable deformations of the holes and possible breakage of the sheet "bridges" between adjacent holes.
  • metal fiber meshes are expensive and dimensionally poorly stable, and therefore are often used in combination with a supporting metal mesh which further increases the burner cost.
  • properties (permeability, thickness, density) of the metal fiber meshes have a statistic distribution with high standard deviation. This makes it difficult to control the parameters which affect the combustion and results in uncertainties in the ignition, flame detection, fuel flow load and specific thermal power of the burner.
  • a very common type of burner has a flat metal frame with an elongated opening with two parallel rectilinear longitudinal edges and two semi-circular end edges, to which a combustion membrane is fixed with a diffuser layer made of metal mesh having a "cannoli" or semi-cigar shape with a central portion which is cylinder-segment shaped and two end portions which are spherical-segment-shaped.
  • This type of known burner shows the advantages and disadvantages of the prior art in an exemplary manner: the use of metal meshes to facilitate the formation of complex tridimensional shapes while keeping the perforation or porosity features of the mesh nearly unchanged, but at the expense of higher cost and greater statistic variability of the properties (weight distribution, permeability, mechanical strength and thermal expansion) of the metal mesh with respect to sheets and porous ceramic layers.
  • a gas burner for a heater comprises:
  • the construction of the combustion surface made of a perforated metal sheet and its single curvature shape thus without hole distortion, result in highly accurate, constant and repeatable properties (permeability, weight distribution, thermal capacity, thermal conductivity, mechanical strength, thermal expansion), which allow the combustion parameters to be better controlled.
  • the construction of the combustion surface and of the entire tridimensional combustion membrane of metal sheet obviates the need to use expensive materials, such as metal meshes or porous ceramic materials, and facilitates the connection of the combustion membrane made of metal sheet to the frame made of metal sheet.
  • single curvature means a curvature or a folding of a sheet, layer or tridimensional curved plane about a single axis or about multiple parallel axes, such as not to result in a distortion of the curved plane with respect to the initially flat shape.
  • single curvature itself does not exclude the presence of flat zones (infinite curvature radius) which can be formed in combination, e.g. in an alternating manner, with curved zones.
  • a gas burner 1 for heaters comprises a planar metal frame portion 2 with an elongated opening 3 (e.g. extended along a longitudinal axis 4) defined by two longitudinal edges 5 extending in the direction of a longitudinal axis 4 and mutually opposite and facing each other, and by two end edges 6 which are transversal to the longitudinal axis 4 and also mutually opposite and facing each other.
  • Burner 1 further comprises a combustion membrane 7 in the form of a tridimensional shell, connected to the frame portion 2 along the longitudinal edges 5 and transversal edges 6.
  • the combustion membrane 7 has a diffuser layer 8 which forms an outer combustion surface 9 made of a perforated metal sheet, and which extends between the two longitudinal edges 5 with a single curvature out of the plane 10 of the frame portion 2.
  • the diffuser layer 8 made of a perforated metal sheet is connected to the two longitudinal edges 5 and extends from the longitudinal edges as an arched bridge with single curvature over opening 3.
  • the combustion membrane 7 further has two closure portions 11 made of metal sheet which extend from the transversal edges 6 out of the plane 10 of the frame portion 2 and which close (otherwise free) end areas 12 between the diffuser layer 8 and the transversal edges 6 of the frame portion 2.
  • combustion surface 9 made of a perforated metal sheet and its single curvature shape, thus without distortion of the holes 13, result in highly accurate, constant and repeatable properties (permeability, weight distribution, thermal capacity, thermal conductivity, mechanical strength, thermal expansion), which allow the combustion parameters to be better controlled.
  • the diffuser layer 8 with the combustion surface 9 made of metal sheet has a sectional shape on a section plane transversal to the longitudinal axis 4 in the form of:
  • the diffuser layer 8 with the combustion surface 9 has a constant cross section along the longitudinal extension of the combustion surface 9, i.e. along the longitudinal axis 4, similar to an extruded shape.
  • the closure portions 11 have a wall 14 which is substantially flat and transversal to the plane 10 of the frame portion 2 and a folded edge 15 which connects the flat wall 14 to the diffuser layer 8.
  • the folded edge 15 of the closure portion 11 may have an arched shape which is substantially compatible with the arched shape of the diffuser layer 8.
  • the closure portions 11 may each form a wall 14 which is substantially flat and perpendicular to the plane 10 of the frame portion 2 ( Figures 2 , 5 , 6 ).
  • the flat walls 14 may be inclined with respect to the plane 10 of the frame portion 2 towards opening 3 (in a converging manner, Fig. 9a ) or away from opening 3 (in a diverging manner, Fig. 9b ).
  • closure portions 11 and/or the transversal edges 6 may comprise one or more folds or stiffening ribs, e.g. bulges, which could extend from frame 2 through the transversal edge 6 up into the closure portion 11 ( Fig. 6 ).
  • the longitudinal thermal expansions of the diffuser membrane 7 can be prevented from spreading irreversibly, thus deforming the closure portions 11 and creating unplanned gas passage zones.
  • At least one of the closure portions 11 and the diffuser layer 8 is formed together with the frame portion 2 in a single piece of metal sheet ( Figs. 4,6 ). It is particularly advantageous to form at least one or both of the closure portions 11 together with the frame portion 2 in a single piece of metal sheet, e.g. by folding the closure portions 11 out of the plane 10 of frame 2 along the transversal edges 6 of opening 3 ( Figs. 4, 6 ).
  • the construction of the folded edge 15 may include a cut-out 20 of the sheet in the frame portion 2 at the ends of the longitudinal edges 5 in the corner zone with the transversal edges 6 ( Figs. 4, 5 ). These cut-outs 20 may be advantageously sealed by means of localized welds 21 which create four irreversible fixing points between the diffuser layer 8 and the frame 2.
  • Alternative fastenings between the closure portions 11 and the transversal edges 6 of the frame comprise, for example, welds, crimping, fitting, gluing or folding.
  • At least one of the closure portions 11 and the diffuser layer 8 is connected to the frame portion 2 by means of an elastic fit, preferably a snap fit.
  • an elastic fit preferably a snap fit.
  • the fixing between the combustion membrane 7 (in particular the diffuser layer 8) and the frame portion 2 may be made by means of a fixing edge 17 which protrudes from an outer periphery of the combustion membrane 7 (in particular from the diffuser layer 8) and which is fixed, e.g. welded, crimped, fitted, glued or sandwiched, to the corresponding edge (in particular the longitudinal edge 5) of the frame portion 2.
  • the fixing edge 17 may be made of the same metal sheet of the combustion membrane 7 (in particular of the diffuser layer 8), e.g. by bending a peripheral region thereof, but is superimposed on the frame portion 2 on the combustion side 18 or preferably on the feeding side 19 ( figure 4 ) and does not allow the passage of fuel mix or the formation of flame. Therefore, in the present description, the fixing edge 17 is not considered within the definition of "diffuser layer 8".
  • the diffuser layer 8 can be inserted from the feeding side 19 into the opening 3 of the frame portion 2 to engage the fixing edge 17 and/or a stop groove 16 with a longitudinal edge 5 of the opening 3, and place the end portions against the folded edges 15 of the closure portions 11 ( Fig. 4 ).
  • burner 1 comprises a distributor 22 for distributing the fuel mix in a desired manner towards the diffuser layer 8.
  • Distributor 22 comprises one or more walls made of metal sheet with a plurality of through openings 23 and may form an inner layer (feeding side 19) of the combustion membrane 7 or, alternatively, a component spaced apart from the diffuser layer 8.
  • Distributor 22 may be connected to the frame portion 2 or to the diffuser layer 8 by means of an elastic fit, preferably a snap fit.
  • an elastic fit preferably a snap fit.
  • the snap fitting could be completed later by means of spot or seam welding to make the connection irreversible.
  • burner 1 comprises one or more folded tabs, formed in at least one of or in all the components (frame 2, diffuser layer 8, closure portions 11 or distributor 22) and which engage one or more of said other components to block the burner assembly 1 in a permanent manner.
  • Distributor 22 may also comprise a fixing edge 24 configured in a manner identical or similar to that described with reference to the fixing edge 17 of the diffuser layer 8, and may be inserted from the feeding side 19 into the opening 3 of the frame portion 2 to engage the fixing edge 24 and/or a stop groove with a corresponding edge of the opening 3 or of the combustion membrane 7 ( Fig. 4 ).
  • the distributor 22 and the diffuser layer 8 are formed together in a single piece of metal sheet.
  • the metal sheet may be folded so as to form a double wall structure extending as an arc out of the plane 10 of the frame portion 2 and further forming a connection edge with the frame portion 2 ( Fig. 7 ).
  • the longitudinal edges 5 are rectilinear and parallel to each other and parallel to the longitudinal axis of opening 4 and burner 1.
  • the transversal edges 6 are also rectilinear, parallel to each other and preferably perpendicular to the longitudinal edges 5.
  • opening 3 has an elongated rectangular shape.
  • the closure portions 11 are preferably free from holes or are gas-impermeable, even if in particular embodiments a perforation and flame formation could also be contemplated in the closure portions 11.
  • the entire combustion membrane 7 is preferably free from metal mesh or fabric.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP16153084.5A 2015-02-16 2016-01-28 Gasbrenner für ein heizgerät Withdrawn EP3064831A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20150216 2015-02-16

Publications (1)

Publication Number Publication Date
EP3064831A1 true EP3064831A1 (de) 2016-09-07

Family

ID=52815125

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16153084.5A Withdrawn EP3064831A1 (de) 2015-02-16 2016-01-28 Gasbrenner für ein heizgerät

Country Status (3)

Country Link
US (1) US20160238243A1 (de)
EP (1) EP3064831A1 (de)
CN (1) CN105889915A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019193025A1 (en) * 2018-04-05 2019-10-10 Bekaert Combustion Technology B.V. Conical premix gas burner
EP3572728A1 (de) * 2018-05-22 2019-11-27 Bekaert Combustion Technology B.V. Vorgemischgasbrenner
WO2021140036A1 (en) 2020-01-08 2021-07-15 Bekaert Combustion Technology B.V. Gas burner and heating appliance
NL2024623B1 (en) 2020-01-08 2021-09-07 Bekaert Combustion Tech Bv Gas burner and heating appliance
NL2028637B1 (en) 2021-07-06 2023-01-12 Bekaert Combustion Tech Bv Premix gas burner system and method

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3018408B1 (de) * 2014-11-05 2017-06-07 WORGAS BRUCIATORI S.r.l. Brenner
KR102368554B1 (ko) * 2016-09-13 2022-03-02 베카에르트 컴버스천 테크놀러지 비.브이. 예혼합 가스 버너
IT201700062133A1 (it) * 2017-06-07 2018-12-07 Worgas Bruciatori Srl Bruciatore
IT201700062155A1 (it) * 2017-06-07 2018-12-07 Worgas Bruciatori Srl Bruciatore
CN110832252B (zh) * 2017-07-13 2023-02-17 贝卡尔特燃烧技术股份有限公司 预混合气体燃烧器
WO2019021039A1 (en) * 2017-07-28 2019-01-31 Polidoro S.P.A. BURNER UNIT
CN112567176B (zh) * 2018-04-19 2023-03-07 贝卡尔特燃烧技术股份有限公司 预混气体燃烧器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0472270A1 (de) * 1990-06-21 1992-02-26 Furigas (U.K.) Limited Gasbrenner
EP0809071A1 (de) * 1995-05-05 1997-11-26 Burner Systems International, Inc. Vormischgasbrenner

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2146171A (en) * 1938-04-29 1939-02-07 Orson G Burch Toaster
GB1105757A (en) * 1966-10-25 1968-03-13 Caloric Internat Inc Improvements in or relating to radiant burners
IT1315588B1 (it) * 2000-02-02 2003-03-14 Worgas Bruciatori Srl Bruciatore dotato di mezzi di protezione contro surriscaldamenti dellatesta del bruciatore.
US20060154191A1 (en) * 2004-06-18 2006-07-13 Worgas Bruciatori S.R.L.. Burner with diffuser resistant to high operating temperatures
TWI342420B (en) * 2006-06-26 2011-05-21 Au Optronics Corp Auto repair structure for lcds

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0472270A1 (de) * 1990-06-21 1992-02-26 Furigas (U.K.) Limited Gasbrenner
EP0809071A1 (de) * 1995-05-05 1997-11-26 Burner Systems International, Inc. Vormischgasbrenner

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019193025A1 (en) * 2018-04-05 2019-10-10 Bekaert Combustion Technology B.V. Conical premix gas burner
EP3572728A1 (de) * 2018-05-22 2019-11-27 Bekaert Combustion Technology B.V. Vorgemischgasbrenner
WO2021140036A1 (en) 2020-01-08 2021-07-15 Bekaert Combustion Technology B.V. Gas burner and heating appliance
NL2024623B1 (en) 2020-01-08 2021-09-07 Bekaert Combustion Tech Bv Gas burner and heating appliance
NL2028637B1 (en) 2021-07-06 2023-01-12 Bekaert Combustion Tech Bv Premix gas burner system and method
WO2023280923A1 (en) 2021-07-06 2023-01-12 Bekaert Combustion Technology B.V. Premix gas burner system and method

Also Published As

Publication number Publication date
CN105889915A (zh) 2016-08-24
US20160238243A1 (en) 2016-08-18

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