EP2713105B1 - Vormischbrenner mit Gasverbrennungskopf - Google Patents

Vormischbrenner mit Gasverbrennungskopf Download PDF

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Publication number
EP2713105B1
EP2713105B1 EP13186354.0A EP13186354A EP2713105B1 EP 2713105 B1 EP2713105 B1 EP 2713105B1 EP 13186354 A EP13186354 A EP 13186354A EP 2713105 B1 EP2713105 B1 EP 2713105B1
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EP
European Patent Office
Prior art keywords
combustion
wall
conical
openings
combustion head
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EP13186354.0A
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English (en)
French (fr)
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EP2713105A1 (de
Inventor
Oscar Pallaro
Federico Cortelazzo
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Systema Polska Sp zo o
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Systema Polska Sp zo o
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Priority to PL13186354T priority Critical patent/PL2713105T3/pl
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    • 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
    • F23D14/105—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 with injector axis parallel to the burner head axis
    • 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
    • F23D2203/102—Flame diffusing means using perforated plates
    • 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 regards a gas combustion head for premixed burners and a burner provided with the aforesaid combustion head, according to the preamble of the respective independent claims.
  • the present combustion head and the burner are of the type adapted to be advantageously employed for obtaining thermodynamic appliances, in particular for heating, adapted to generate heat through a flow of burnt gases to be employed in exchangers for the production of a thermal energy.
  • premixed burners In order to increase the performances of heat generators fed with fuel gas, whether they are intended to produce hot air, hot water or vapor, the use of premixed burners has been increasingly employed, characterized by having a premixing between the comburent air and the fuel gas upstream of the combustion area.
  • a particular feature of said burners is that they are able to ensure an optimal combustion over a wide range of thermal power, and they also allow the reduction of the size of the combustion chambers.
  • Premixed burners have been on the market for years and mainly have application on hot air generators and on hot water boilers.
  • the thermal power of the single burner usually does not on average exceed several hundred kilowatts; this is linked to the technical characteristics of the combustion heads currently employed on said premixed burners.
  • the continuous adjustment range of the thermal power of the aforesaid burners with current combustion heads is also limited; it is not easy and sometimes impossible to remove or only reduce the frequent noise and vibration phenomena that arise, and the adjustment as well is not simple.
  • the current combustion heads employed on premixed burners fully condition the geometry of the combustion chamber, requiring the use of only one specific type thereof.
  • a burner having the features specified in the preamble of claim 1 is known from US 2004/096794 .
  • a burner provided with a plurality of combustion heads for the air-gas mixture, formed by pairs of walls converging together and flanked to form contiguous channels with longitudinal extension.
  • the walls are provided with a plurality of openings for the passage of the air-gas fluid.
  • Such solution has proven to be spatially bulky given the same power burned and unsuitable for creating a flame conformation capable of obtaining an optimized flow of hot gases, in particular for a combustion chamber of flame inversion type.
  • the flame that is formed in these combustion heads has main extension parallel to the longitudinal extension of the channels and is not directed in the extension direction of the hot gases.
  • the patent JP S62196517 describes a burner having a combustion head with a pair of walls entirely similar to those described above.
  • burners provided with one or more combustion heads with conical form provided with a main opening centrally obtained on the bottom of the cone, and fed by a main duct with air-gas mixture.
  • the main opening is surrounded by a plurality of secondary openings fed with the same mixture. From the main opening, a main flow exits with high speed and high flow rate, while from the secondary openings a plurality of minor flows exit with smaller flow rate, much less than that of the main opening; the main purpose of such minor flows is to stabilize the flame created by the main duct.
  • the secondary and main feed ducts are made in a body shaped in a distinct manner.
  • the ducts direct the outflow of the fluid with their extension parallel or tilted with respect to the symmetry axis of the cone.
  • the openings at the ends of the ducts are affected by the fall of pressure in the same duct, i.e. in distribution chambers obtained in the same shaped body of the burner.
  • the resulting form of the total flame is very much affected by the pressure of the air/gas mixture. Given that the resulting overall flame is mainly obtained by the main flow of air/gas mixture, it does not have a high combustion surface area, and hence is unsuitable for maintaining the NOx emissions at a low level.
  • the main object of the present invention is to overcome the already known drawbacks of the prior art that are mentioned above, by presenting a combustion head for premixed burners which can separately burn even more than 500 kilowatts and which has a continuously variable adjustment range approximately from 5 to 100% of the thermal power, without noise and especially resonance problems. Indeed, due to the particular convexity of the conical surface for the outflow of the fuel gas - air mixture, one is able to exploit the self-feeding effect and obtain a stable flame in the various burnt thermal flow conditions, with all types of fuel gas.
  • Further object of the present invention is to present a burner whose combustion head is particularly adapted for its combustion chamber of "flame inversion" type.
  • the longitudinal stability of the flame due to the particular convexity of the conical surface for the distribution of the fuel gas - air mixture, in fact allows the possibility of also using cylindrical combustion chambers in which the flame inversion is obtained in the combustion chamber itself, overall optimizing the heat exchange surfaces and the exhaust of the combustion products.
  • Further object of the present invention is to present a combustion head for premixed burners which has a long duration and which diverges from the classical so-called "radiating heads" more or less coated with metallic or ceramic materials. Indeed, due to the particular convexity of the conical surface for feeding the fuel gas - air mixture present in the combustion head of the invention, the development and the conformation of the flame are such to not heat the body of the combustion head itself, ensuring greater stability and duration over time.
  • reference number (10) indicates the gas combustion head for premixed burners in its entirety.
  • the main body (11) adapted to receive a fuel gas - air mixture (15), which is provided with an internal distribution chamber (14) for the fuel gas - air mixture (15) and with at least one distribution wall (12).
  • the latter is provided with a series of openings (13), through which the fuel gas - air mixture (15) coming from the distribution chamber (14) flows.
  • the distribution wall (12) of the main body (11) has conical shape with sections substantially circular with respect to planes orthogonal to the central axis (Z) of the cone and with convexity directed towards the internal distribution chamber (14).
  • Such distribution wall (12) is formed by two sheet-shaped metal plates with the aforesaid plurality of openings (13) obtained in their thickness.
  • the latter (13) have size substantially equal to each other, and are traversed, orthogonally to the conical surface of said sheet-like plates in directions (Y) tilted towards the central axis (Z) of the cone, by flows of air-gas mixture with substantially equal flow speeds and susceptible of generating flames inside a combustion area (16) that are substantially equal and symmetrically arranged around the central axis (Z) of the cone as well as converging towards such central axis (Z) so as to form together a flow of hot burnt gases with maximum flow rate at the central axis (Z) of the cone.
  • the aforesaid combustion head (10) delimits the combustion area (16) outside said main body (11) where the igniting of the fuel gas - air mixture occurs and where the flame (17) is formed, with extension along the longitudinal axis (18) of a combustion chamber (19), in particular coinciding with the central axis of the cone (Z) of the head (12).
  • the sheet-shaped plates can be advantageously made in net form.
  • a combustion chamber with "flame inversion" (19) is indicated, the gas combustion head for premixed burners (10) being coupled to such chamber.
  • Gas combustion head for premixed burners 11
  • Main body 12 Conical surfaces 13 Openings made on the conical surfaces 14
  • Distribution chamber for the fuel gas - air mixture 15 Fuel gas - air mixture 16 Combustion area where the igniting of the fuel gas - air mixture occurs 17 Flame with longitudinal extension 18 Longitudinal axis 19 Combustion chamber 20 Combustion products 21 Bottom wall of the combustion chamber 22 Passage section for the combustion products into the flue gas exchanger
  • the main body (11) receives, in the distribution chamber (14), a fuel gas - air mixture (15) that is premixed in a system upstream of the body itself.
  • the internal distribution chamber (14) thus has a fuel gas - air mixture (15) that is pressurized with respect to the combustion area (16).
  • a flow of air-gas mixture then exits, which is ignited by means of an ignition device (not reported), immediately in the area enclosed by the conical surface (12) identified as the combustion area (16).
  • the single flows that exit from the openings (13) are extended in directions (Y) that are tilted with respect to the central symmetry axis (Z) of the cone.
  • the shape of the surface (12) can assume various configurations, advantageously including a frustoconical shape.
  • the conical wall (12) comprises two conical plates, each provided with a plurality of openings, parallel and spaced from each other along the extension of the longitudinal axis (18).
  • the size of the openings (13) is usually the same in the extension of the conical shape along the longitudinal axis.
  • the flow rate of the air-gas mixture through each single opening (13) is proportional to its passage section and to the pressure present in the distribution chamber (14).
  • the sections of the plurality of openings (13) of the conical wall (12), for the passage of the fuel gas - air mixture (15) are organized on circumferences of the conical wall (12) that are spaced from each other with variable pitch along the direction of the longitudinal axis (18).
  • the degree of conicity of the surface (12) can be varied.
  • the gas combustion head (10) for premixed burners is coupled to a combustion chamber with "flame inversion" (19).
  • the flame (17) is developed and propagated in the direction of the bottom wall (21) of the combustion chamber (19), such wall being opposite the base wall (23) where the combustion head (10) is mounted.
  • the combustion products (20) arrive in proximity to this wall (21), they reverse direction by 180° in order to be introduced downstream in the flue gas exchanger system, through at least one exhaust section (22) placed in proximity to the starting front of the flame (17) i.e. to the base wall (23). More in detail, such exhaust section (22) can be obtained in the advantageously cylindrical lateral wall (24) that joins the bottom wall (21) to the base wall (23), at the latter, or it can be obtained directly with perimeter openings in the base wall (23).

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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)

Claims (5)

  1. Vormischbrenner für Luft-Gas-Gemische, der Folgendes umfasst:
    - einen Gasverbrennungskopf (10) umfassend:
    einen eine innere Verteilerkammer (14) begrenzenden Hauptkörper (11), der an mindestens einen Zuführungskanal zur Einleitung eines Brenngas-Luft-Gemisches (15) in die genannte innere Verteilerkammer (14) angeschlossen ist
    - eine mit dem genannten Gasverbrennungskopf (10) gekoppelte Brennkammer (19), die Folgendes umfasst:
    - eine zu der genannten Verteilerwand (12) gerichtete untere Wand (21), die geeignet ist, die Flussrichtung der Verbrennungsgase (20) des genannten Luft-Gas-Gemisches (15) um 180 Grad umzukehren,
    - eine gegenüberliegende Basiswand (23), auf der sich der genannte Gasverbrennungskopf (10) befindet und zu der die genannten Verbrennungsgase (20) mittels der genannten unteren Wand (21) geleitet werden können; wobei an dieser Basiswand (23) Auslassabschnitte (22) für die Verbrennungsgase außerhalb der genannten Verteilerwand (12) eingerichtet sind;
    dadurch gekennzeichnet, dass der Hauptkörper (11) mit mindestens einer Verteilerwand (12) mit einer Vielzahl von Öffnungen (13) ausgestattet ist, durch die das Brenngas-Luft-Gemisch (15) von der genannten inneren Verteilerkammer (14) des genannten Hauptkörpers (11) in einen Verbrennungsbereich (16) außerhalb des genannten Hauptkörpers (11) fließt; wobei die Verteilerwand (12) des genannten Gasverbrennungskopfs (10) eine konische Form mit im Wesentlichen kreisförmigen Abschnitten im Verhältnis zu der Mittelachse (Z) des Konus rechtwinkligen Ebenen und Konvexität zu der genannten inneren Verteilerkammer (14) aufweist; wobei die genannte Verteilerwand (12) aus zwei blechförmigen Platten mit der genannten Vielzahl an in ihrer Stärke erzielten Öffnungen (13) gebildet wird und diese Öffnungen (13) eine im Wesentlichen gleiche Größe aufweisen und so angeordnet sind, dass sie geeignet sind, rechtwinklig zu der konischen Fläche der genannten blechförmigen Platten in Richtungen (Y) mit Neigung zu der Mittelachse (Z) des genannten Konus von Flüssen des genannten Luft-Gas-Gemisches (15) bei im Wesentlichen gleichbleibenden Fließgeschwindigkeiten überquert zu werden und Flammen in dem genannten Verbrennungsbereich (16) zu erzeugen, die im Wesentlichen gleich und symmetrisch um die mittlere Achse (Z) des genannten Konus angeordnet sind und in Richtung dieser Mittelachse (Z) konvergieren und geeignet sind, zusammen einen Fluss aus heißen Verbrennungsgasen mit der höchsten Fließgeschwindigkeit an der genannten Mittelachse (Z) zu bilden (Z);
    wobei die genannten beiden konischen Platten jeweils mit einer Vielzahl an parallelen und voneinander entfernten Öffnungen entlang des Verlaufs der Längsachse (18) der genannten Verbrennungskammer (19) ausgestattet sind und mit der Mittelachse (Z) des Konus des genannten Gasverbrennungskopfs (10) übereinstimmen;
    wobei die genannten konischen Platten der genannten konischen Verteilerwand (12) zwischen der genannten inneren Verbrennungskammer (14) und dem genannten Verbrennungsbereich (16) positioniert sind;
    wobei die genannte Verbrennungskammer (19) eine axiale, auf der Achse (Z) des Konus des genannten Gasverbrennungskopfes (10) zentrierte Symmetrie aufweisen.
  2. Brenner nach Anspruch 1, bei dem die konische Wand (12) eine Kegelstumpfform definiert.
  3. Brenner nach einem beliebigen der vorangegangenen Ansprüche, bei dem die Öffnungen der Vielzahl an Öffnungen (13) der konischen Wand zum Durchgang des Brenngas-Luft-Gemisches auf Umfängen der konischen Wand angeordnet sind, die voneinander mit variabler Steigung entlang der Richtung der Längsachse (18) entfernt sind.
  4. Brenner nach einem beliebigen der vorangegangenen Ansprüche, bei dem die genannte Verbrennungskammer (19) zylindrische Form aufweist.
  5. Brenner nach einem beliebigen der vorangegangenen Ansprüche, bei dem die blechförmigen Platten der Verteilerwand (12) des genannten Gasverbrennungskopfs (10) netzförmig sind.
EP13186354.0A 2012-09-27 2013-09-27 Vormischbrenner mit Gasverbrennungskopf Active EP2713105B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13186354T PL2713105T3 (pl) 2012-09-27 2013-09-27 Palnik z wstępnym mieszaniem wyposażony w głowicę spalania gazu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000282A ITPD20120282A1 (it) 2012-09-27 2012-09-27 Testa di combustione a gas per bruciatori premiscelati

Publications (2)

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EP2713105A1 EP2713105A1 (de) 2014-04-02
EP2713105B1 true EP2713105B1 (de) 2017-04-12

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EP (1) EP2713105B1 (de)
IT (1) ITPD20120282A1 (de)
PL (1) PL2713105T3 (de)
RU (1) RU147854U1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20120282A1 (it) 2012-09-27 2014-03-28 Systema Polska Sp Zo O Testa di combustione a gas per bruciatori premiscelati
GB2509492A (en) 2012-12-19 2014-07-09 Worgas Burners Ltd A gas burner having a combustion surface formed by a sheet with plural apertures
DE102017102085A1 (de) 2017-02-02 2018-08-02 Max Weishaupt Gmbh Vormischverfahren, dieses verwendendes Verbrennungsverfahren sowie Vormischvorrichtung und damit versehener Brenner
WO2018217915A1 (en) * 2017-05-24 2018-11-29 Carrier Corporation Inward fired low nox premix burner
WO2018215241A1 (en) 2017-05-24 2018-11-29 Bekaert Combustion Technology B.V. Inwardly firing premix gas burner
WO2019165385A1 (en) * 2018-02-23 2019-08-29 Fulton Group N.A., Inc. Inward-firing premix fuel combustion burner
US12338993B2 (en) 2018-02-23 2025-06-24 Fulton Group N.A., Inc. Compact flat plate premix fuel combustion system, and fluid heating system and packaged burner system including the same
WO2019193025A1 (en) 2018-04-05 2019-10-10 Bekaert Combustion Technology B.V. Conical premix gas burner
WO2019207559A2 (en) * 2018-04-13 2019-10-31 Fulton Group N.A., Inc. Compact dual-fuel combustion system, and fluid heating system and packaged burner system including the same
WO2023028129A1 (en) * 2021-08-25 2023-03-02 Fulton Group N.A., Inc. Compact flat plate premix fuel combustion system, and fluid heating system and packaged burner system including the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6129545A (en) * 1996-11-26 2000-10-10 Schott Glaswerke Gas burner with pollution-reducing features

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US2121948A (en) * 1935-05-11 1938-06-28 Western Electric Co Burner
JPH0619216B2 (ja) * 1986-02-24 1994-03-16 大阪瓦斯株式会社 ガスバ−ナ
EP0579315A1 (de) * 1992-07-07 1994-01-19 Ingenieursburo P.I. Produkt Innovatie B.V. Brenner
US5458484A (en) 1994-05-16 1995-10-17 Carrier Corporation Pre-mix flame type burner
SE0100948L (sv) * 2001-03-19 2002-09-20 Sandvik Ab Brännare för gas
EP1538395A1 (de) 2003-12-05 2005-06-08 Riello S.p.a. Brennerkopf für einen Vormischbrenner
KR100778716B1 (ko) * 2006-07-07 2007-11-22 주식회사 경동나비엔 가스버너의 염공부 구조
ITMO20060419A1 (it) * 2006-12-22 2008-06-23 Worgas Bruciatori Srl Bruciatore con diffusore resistente ad alte temperature di esercizio
ITPD20120282A1 (it) 2012-09-27 2014-03-28 Systema Polska Sp Zo O Testa di combustione a gas per bruciatori premiscelati

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6129545A (en) * 1996-11-26 2000-10-10 Schott Glaswerke Gas burner with pollution-reducing features

Also Published As

Publication number Publication date
ITPD20120282A1 (it) 2014-03-28
EP2713105A1 (de) 2014-04-02
RU147854U1 (ru) 2014-11-20
PL2713105T3 (pl) 2017-10-31

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