EP2037175A2 - Premixed burner - Google Patents

Premixed burner Download PDF

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Publication number
EP2037175A2
EP2037175A2 EP08015450A EP08015450A EP2037175A2 EP 2037175 A2 EP2037175 A2 EP 2037175A2 EP 08015450 A EP08015450 A EP 08015450A EP 08015450 A EP08015450 A EP 08015450A EP 2037175 A2 EP2037175 A2 EP 2037175A2
Authority
EP
European Patent Office
Prior art keywords
holes
disk
premixed burner
openings
burner according
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
EP08015450A
Other languages
German (de)
French (fr)
Other versions
EP2037175A3 (en
EP2037175B1 (en
Inventor
Domenico Peserico
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.)
Polidoro SpA
Original Assignee
Polidoro SpA
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
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Application filed by Polidoro SpA filed Critical Polidoro SpA
Priority to PL08015450T priority Critical patent/PL2037175T3/en
Publication of EP2037175A2 publication Critical patent/EP2037175A2/en
Publication of EP2037175A3 publication Critical patent/EP2037175A3/en
Application granted granted Critical
Publication of EP2037175B1 publication Critical patent/EP2037175B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • 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
    • F23D14/70—Baffles or like flow-disturbing devices
    • 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
    • F23D2203/102—Flame diffusing means using perforated plates
    • F23D2203/1023—Flame diffusing means using perforated plates with specific free passage areas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2213/00—Burner manufacture specifications
    • 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
    • F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet

Definitions

  • the present invention relates to a premixed burner.
  • the present invention relates to a premixed burner, typically of cylindrical shape and especially suitable for combustion boilers.
  • premixed burners comprise a header along which a fan conveys the air-gas mixture.
  • Said burners are traditionally provided with an inner liner or distributor, provided with suitable through openings and that lead the mixture to the burner surface; the latter is also provided with multiple holes or slits having much smaller size than that of the header to prevent backfires. While this known solution is functional, it shows some considerable drawbacks.
  • the inner liner or distributor causes considerable unevenness of temperature on the burner surface; this is due to the fact that the mixture that flows from the inner distributor holes directly impinges the outer body, cooling it in correspondingly localised zones and thereby creating thermal gradients with consequent cyclical endurance stress, caused by the same boiler cycle. Due to the high temperatures reached, even higher than 700°C, microfissures may occur on the burner surface that over time, cause real and extended breakage; in these cases, the burner must be replaced in full, as it cannot be repaired anymore, but there is also a concrete risk of explosion due to backfire.
  • the object of this invention is to obviate the drawbacks mentioned hereinabove.
  • the object of this invention is to provide a premixed burner which should not require setting up and coupling an inner distributor of the air-gas mixture to the burner itself.
  • a further object of the invention is to provide a premixed burner the surface whereof should show a substantial temperature evenness in operation, preventing or at least reducing in a substantial manner the risk of formation of microfissures and backfires.
  • a further object of the invention is to provide the users with a premixed burner suitable for ensuring high level of resistance and reliability over time, also such as to be easily and inexpensively constructed.
  • the premixed burner of this invention which is composed of a tubular body, closed on a head by a plate welded or crimped along the side surface whereof a plurality of holes and slits is obtained, and which is essentially characterised in that it comprises at least one disk, fixed to the opposite head of said tubular body, provided with a plurality of through openings or holes and constituting the distribution head of the air-gas mixture into the same body.
  • the premixed burner of the present invention globally indicated with 10 at figure 2 and by way of an example with cylindrical or optionally truncated-cone shape, comprises a tubular body 12, generally of steel, closed on a head by a welded or crimped plate 24.
  • the side surface of the tubular body 12 is provided with a plurality of small through openings or slits and holes of any shape, indicated with 14; by way of an example, said holes and slits are only represented on limited parts of body 12, it being understood that they may be made along the entire side surface of said body according to any configuration and/or size.
  • the head of the tubular body 12 opposite plate 24 is closed by at least one disk 16 provided with flange 18 with circumferential lowering 18' for coupling with the inlet indicated with 20; disk 16 is preferably made in a single body with flange 18 and is provided with a plurality of holes 22, having by way of an example a circular shape and even diameter.
  • Said holes 22, which extend almost by the entire surface of disk 16, in any case may have any diameter or shape and optionally be made in groups with different diameters and/or shapes, also distributed randomly on said surface of disk 16.
  • Diameter, shape and distribution of holes 22 along disk 16 are, in the practice, defined upon the system calibration and vary according to the different types of burners, since such calibration is specifically intended for optimising the efficiency thereof.
  • disk 16 with holes 22 replaces the traditional inner distributor; flange 18 is coupled in a known manner to the conventional header that feeds the air-gas mixture and the latter, as a consequence, enters frontally rather than circumferentially, into body 12 constituting the burner.
  • disk 16 defines the distribution head of burner 10, thus making the inner distributor unnecessary.
  • Experimental tests carried out by the applicant have enabled checking that the burner according to this invention ensures the same levels of efficiency of the known solutions that envisage the use of the inner distributor, with the further advantage of preventing lack of homogeneity in the heat distribution on the tubular body 12.
  • a solution of this type is also suitable for burners of the combustion type on fabric, wherein the side surface is covered by a metal or ceramic fabric layer.
  • Disk 16 with flange 18 is constrained by welding or crimping to the tubular body 12 and preferably has a planar development; it is also to be provided for said disk to have non-planar configuration, for example concave or convex according to specific requirements.
  • the distribution head of burner 10 it is possible to provide for the distribution head of burner 10 to be composed of two disks 16, suitably spaced from one another, respectively provided with holes, slots or through openings of different shape and/or extension, or for disk 16 to be spaced from flange 18 for creating one or more circumferentially open zones for the passage of mixture.
  • disk 16 with holes 22 that closes one of the heads of the tubular body 12 integrally and effectively replaces the inner distributor used on the conventional burners, with clear advantages in terms of production and assembly cost saving.
  • the absence of the inner distributor moreover, prevents the localised overheating of zones of the tubular body 12 along which the flame develops, preventing the onset of breakage phenomena and above all, excluding the risk of dangerous backfires.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

A premixed burner, especially for condensation burners, comprising a tubular body, closed on a head by a plate welded or crimped along the side surface whereof a plurality of holes and slits is obtained; said burner comprising at least one disk, fixed to the opposite head of said tubular body, provided with a plurality of through openings or holes and constituting the distribution head of the air-gas mixture into the same body.

Description

  • The present invention relates to a premixed burner.
  • More in particular, the present invention relates to a premixed burner, typically of cylindrical shape and especially suitable for combustion boilers.
  • As is known, premixed burners comprise a header along which a fan conveys the air-gas mixture. Said burners are traditionally provided with an inner liner or distributor, provided with suitable through openings and that lead the mixture to the burner surface; the latter is also provided with multiple holes or slits having much smaller size than that of the header to prevent backfires. While this known solution is functional, it shows some considerable drawbacks.
  • In the first place, the need of using an inner liner for distributing and delivering the air-gas mixture to the burner implies a considerable cost, both for making the burner itself and for the relative perforations and for assembling the same to the burner body.
  • Moreover, the inner liner or distributor causes considerable unevenness of temperature on the burner surface; this is due to the fact that the mixture that flows from the inner distributor holes directly impinges the outer body, cooling it in correspondingly localised zones and thereby creating thermal gradients with consequent cyclical endurance stress, caused by the same boiler cycle. Due to the high temperatures reached, even higher than 700°C, microfissures may occur on the burner surface that over time, cause real and extended breakage; in these cases, the burner must be replaced in full, as it cannot be repaired anymore, but there is also a concrete risk of explosion due to backfire.
  • The object of this invention is to obviate the drawbacks mentioned hereinabove.
  • More in particular, the object of this invention is to provide a premixed burner which should not require setting up and coupling an inner distributor of the air-gas mixture to the burner itself.
  • A further object of the invention is to provide a premixed burner the surface whereof should show a substantial temperature evenness in operation, preventing or at least reducing in a substantial manner the risk of formation of microfissures and backfires.
  • A further object of the invention is to provide the users with a premixed burner suitable for ensuring high level of resistance and reliability over time, also such as to be easily and inexpensively constructed.
  • These and other objects are attained by the premixed burner of this invention which is composed of a tubular body, closed on a head by a plate welded or crimped along the side surface whereof a plurality of holes and slits is obtained, and which is essentially characterised in that it comprises at least one disk, fixed to the opposite head of said tubular body, provided with a plurality of through openings or holes and constituting the distribution head of the air-gas mixture into the same body.
  • The construction and functional features of the premixed burner of the present invention shall be better understood from the following detailed description, wherein reference is made to the annexed drawing tables showing a preferred and non-limiting embodiment thereof, wherein:
    • figure 1 shows a schematic exploded perspective view of the premixed burner of this invention;
    • figure 2 shows a schematic perspective view of the same burner assembled in the various components thereof;
    • figure 3 shows a schematic perspective view of a half part of the same burner;
    • figures 4 and 5 show a schematic perspective view of further embodiments referred to the shape of the through openings or holes of distribution head of the same burner.
  • With reference to the above figures, the premixed burner of the present invention, globally indicated with 10 at figure 2 and by way of an example with cylindrical or optionally truncated-cone shape, comprises a tubular body 12, generally of steel, closed on a head by a welded or crimped plate 24. The side surface of the tubular body 12 is provided with a plurality of small through openings or slits and holes of any shape, indicated with 14; by way of an example, said holes and slits are only represented on limited parts of body 12, it being understood that they may be made along the entire side surface of said body according to any configuration and/or size. According to the invention, the head of the tubular body 12 opposite plate 24 is closed by at least one disk 16 provided with flange 18 with circumferential lowering 18' for coupling with the inlet indicated with 20; disk 16 is preferably made in a single body with flange 18 and is provided with a plurality of holes 22, having by way of an example a circular shape and even diameter.
  • Said holes 22, which extend almost by the entire surface of disk 16, in any case may have any diameter or shape and optionally be made in groups with different diameters and/or shapes, also distributed randomly on said surface of disk 16. Diameter, shape and distribution of holes 22 along disk 16 are, in the practice, defined upon the system calibration and vary according to the different types of burners, since such calibration is specifically intended for optimising the efficiency thereof.
  • According to this advantageous embodiment, disk 16 with holes 22 replaces the traditional inner distributor; flange 18 is coupled in a known manner to the conventional header that feeds the air-gas mixture and the latter, as a consequence, enters frontally rather than circumferentially, into body 12 constituting the burner. In the practice, disk 16 defines the distribution head of burner 10, thus making the inner distributor unnecessary. Experimental tests carried out by the applicant have enabled checking that the burner according to this invention ensures the same levels of efficiency of the known solutions that envisage the use of the inner distributor, with the further advantage of preventing lack of homogeneity in the heat distribution on the tubular body 12. A solution of this type is also suitable for burners of the combustion type on fabric, wherein the side surface is covered by a metal or ceramic fabric layer. Disk 16 with flange 18 is constrained by welding or crimping to the tubular body 12 and preferably has a planar development; it is also to be provided for said disk to have non-planar configuration, for example concave or convex according to specific requirements. Moreover, it is possible to provide for the distribution head of burner 10 to be composed of two disks 16, suitably spaced from one another, respectively provided with holes, slots or through openings of different shape and/or extension, or for disk 16 to be spaced from flange 18 for creating one or more circumferentially open zones for the passage of mixture.
  • Further embodiments of disk 16, as detailed above, can be referred to the through openings or holes 22; with regard to such aspect, figures 4 and 5, show respectively a solution in which the openings 22 are bounded by an embossed collar 26 and in which the same through openings or holes 22 are obtained by partial cutting and folding of portion of disk 16, to form embossed tongues developing towards the inner part of the tubular body 12 and are alternated to the same openings 22.
  • As can be noticed from the above, the advantages achieved by the invention are clear.
  • In the premixed burner of this invention, disk 16 with holes 22 that closes one of the heads of the tubular body 12 integrally and effectively replaces the inner distributor used on the conventional burners, with clear advantages in terms of production and assembly cost saving.
  • The absence of the inner distributor, moreover, prevents the localised overheating of zones of the tubular body 12 along which the flame develops, preventing the onset of breakage phenomena and above all, excluding the risk of dangerous backfires.
  • Even if the invention has been described hereinbefore with particular reference to an embodiment thereof made by way of a non-limiting example, several changes and variations will appear clearly to a man skilled in the art in the light of the above description. This invention therefore is intended to include any changes and variations thereof falling within the spirit and the scope of protection of the following claims.

Claims (9)

  1. A premixed burner (10), especially for condensation burners, comprising a tubular body (12), closed on a head by a plate (24) welded or crimped along the side surface whereof a plurality of holes and slits (14) is obtained, characterised in that it comprises at least one disk (16), fixed to the opposite head of said tubular body, provided with a plurality of through openings or holes (22) and constituting the distribution head of the air-gas mixture into the same body (12).
  2. The premixed burner according to claim 1, characterised in that the through openings or holes (22) are bounded by an embossed collar (26) oriented towards the inner part of the tubular body (12).
  3. The premixed burner according to claim 1, characterised in that the through openings or holes (22) are obtained by partial cutting and folding of portion of disk (16) to form embossed tongues developing towards the inner part of the tubular body (12) and are alternated to the same openings (22).
  4. The premixed burner according to previous claim, characterised in that the disk (16) is coupled to a flange (18) with circumferential lowering (18') for coupling with the inlet (20) of the body (12) opposite the head closed by the plate (24).
  5. The premixed burner according to claim 4, characterised in that the disk (16) is obtained integrally with the flange (18).
  6. The premixed burner according to the previous claims, characterised in that the disk (16) with the flange (18) is constrained by welding and/or crimping to a head of the tubular body (12).
  7. The premixed burner according to claims 2 and 3, characterised in that the disk (16) has a non planar development.
  8. The premixed burner according to one or more of the previous claims, characterised in that the through openings or holes (22) have heterogeneous diameter or surface.
  9. The premixed burner according to claim 8, characterised in that said through openings or holes (22) are made on two disks (16) spaced from one another.
EP08015450.3A 2007-09-12 2008-09-02 Premixed burner Active EP2037175B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08015450T PL2037175T3 (en) 2007-09-12 2008-09-02 Premixed burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT001751A ITMI20071751A1 (en) 2007-09-12 2007-09-12 PREMIXED BURNER

Publications (3)

Publication Number Publication Date
EP2037175A2 true EP2037175A2 (en) 2009-03-18
EP2037175A3 EP2037175A3 (en) 2012-11-21
EP2037175B1 EP2037175B1 (en) 2016-11-23

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ID=40111124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08015450.3A Active EP2037175B1 (en) 2007-09-12 2008-09-02 Premixed burner

Country Status (5)

Country Link
EP (1) EP2037175B1 (en)
ES (1) ES2616500T3 (en)
IT (1) ITMI20071751A1 (en)
PL (1) PL2037175T3 (en)
PT (1) PT2037175T (en)

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Publication number Priority date Publication date Assignee Title
WO2009065733A1 (en) * 2007-11-19 2009-05-28 Sit La Precisa S.P.A. Con Socio Unico A burner, specifically a premix burner
WO2009112909A3 (en) * 2008-03-10 2010-06-10 Worgas-Bruciatori - S.R.L. Burner provided with noise reducing means
WO2011069839A1 (en) 2009-12-11 2011-06-16 Bekaert Combustion Technology B.V. Burner with low porosity burner deck
DE102011017023A1 (en) 2011-04-14 2011-12-01 Jaroslav Klouda Burner device for burning gas to produce heat for cooking food, has flow deflector for tapping partial flow of gas and/or fuel mixture and turning partial flow into ignition area, where deflector is arranged in burner body
DE202011005262U1 (en) 2010-05-28 2011-12-22 Jaroslav Klouda Burner with ignition aid
WO2012069534A1 (en) * 2010-11-26 2012-05-31 Bekaert Combustion Technology B.V. Burner with secondary axial flow elements
DE202011107309U1 (en) 2011-11-02 2012-07-24 Jaroslav Klouda Burner with ignition aid device
WO2013107661A2 (en) 2012-01-19 2013-07-25 Bekaert Combustion Technology B.V. Cylindrical gas premix burner
WO2013120715A1 (en) 2012-02-16 2013-08-22 Bekaert Combustion Technology B.V. Premix gas burner
WO2013120716A1 (en) 2012-02-16 2013-08-22 Bekaert Combustion Technology B.V. Premix gas burner
WO2014006103A1 (en) * 2012-07-05 2014-01-09 Giannoni France Surface-combustion gas burner
CN103742911A (en) * 2014-01-07 2014-04-23 天津城建大学 Fully premixed fuel gas burner
EP3006826A1 (en) * 2014-10-10 2016-04-13 WORGAS BRUCIATORI S.r.l. Burner
EP3018408A1 (en) 2014-11-05 2016-05-11 WORGAS BRUCIATORI S.r.l. Burner
EP3187781A1 (en) * 2015-12-30 2017-07-05 Bosch Termoteknik Isitma ve Klima Sanayi Ticaret Anonim Sirketi Burner with an opening for air and/or fuel with cooling fins and a heating apparatus comprising such a burner
WO2017194395A1 (en) 2016-05-13 2017-11-16 Bekaert Combustion Technology B.V. Cylindrical gas premix burner
WO2017194394A1 (en) 2016-05-13 2017-11-16 Bekaert Combustion Technology B.V. Gas premix burner with a cylindrical burner deck
EP3295083A4 (en) * 2015-05-14 2019-01-09 Lochinvar, LLC Burner with flow distribution member
JP2019013912A (en) * 2017-07-11 2019-01-31 株式会社Ihi Fluid distributor and fluid distribution device
WO2019158382A1 (en) 2018-02-14 2019-08-22 Bekaert Combustion Technology B.V. Cylindrical premix gas burner
US10533740B2 (en) 2015-07-09 2020-01-14 Carrier Corporation Inward fired ultra low NOX insulating burner flange
EP3180564B1 (en) * 2014-08-14 2020-10-07 Munster Simms Engineering Limited Burner device for heating apparatus
DE102019129639A1 (en) * 2019-11-04 2021-05-06 Rational Aktiengesellschaft Gas burner assembly for a cooking device and cooking device
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
WO2023280923A1 (en) 2021-07-06 2023-01-12 Bekaert Combustion Technology B.V. Premix gas burner system and method

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EP3628924B1 (en) 2018-09-25 2021-06-02 Polidoro S.p.A. Variable cross-section distributor device for a premixing burner and burner comprising such distributor
EP3628923B1 (en) 2018-09-25 2021-06-16 Polidoro S.p.A. Distributor device for a premixing burner and burner comprising such distributor

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EP1830036A2 (en) * 2006-03-03 2007-09-05 Pratt & Whitney Canada Corp. Internal fuel manifold with turned channel having a variable cross-sectional area
EP1840460A1 (en) * 2006-03-29 2007-10-03 Aeromatix Limited Gas burner

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009065733A1 (en) * 2007-11-19 2009-05-28 Sit La Precisa S.P.A. Con Socio Unico A burner, specifically a premix burner
WO2009112909A3 (en) * 2008-03-10 2010-06-10 Worgas-Bruciatori - S.R.L. Burner provided with noise reducing means
EP2510281B1 (en) 2009-12-11 2017-10-25 Bekaert Combustion Technology B.V. Burner with low porosity burner deck
WO2011069839A1 (en) 2009-12-11 2011-06-16 Bekaert Combustion Technology B.V. Burner with low porosity burner deck
JP2013513774A (en) * 2009-12-11 2013-04-22 ベーカート・コンバスチョン・テクノロジー・ベスローテン・フェンノートシャップ Burner with low porosity burner deck
DE202011005262U1 (en) 2010-05-28 2011-12-22 Jaroslav Klouda Burner with ignition aid
WO2012069534A1 (en) * 2010-11-26 2012-05-31 Bekaert Combustion Technology B.V. Burner with secondary axial flow elements
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PT2037175T (en) 2017-02-27
PL2037175T3 (en) 2017-05-31
EP2037175A3 (en) 2012-11-21
ES2616500T3 (en) 2017-06-13
EP2037175B1 (en) 2016-11-23
ITMI20071751A1 (en) 2009-03-13

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