EP3126737B1 - Mit einem luft-gas-gemisch gekühlter vormischbrenner - Google Patents

Mit einem luft-gas-gemisch gekühlter vormischbrenner Download PDF

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Publication number
EP3126737B1
EP3126737B1 EP15718080.3A EP15718080A EP3126737B1 EP 3126737 B1 EP3126737 B1 EP 3126737B1 EP 15718080 A EP15718080 A EP 15718080A EP 3126737 B1 EP3126737 B1 EP 3126737B1
Authority
EP
European Patent Office
Prior art keywords
burner
burner head
air
head
distributing element
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
EP15718080.3A
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English (en)
French (fr)
Other versions
EP3126737A1 (de
Inventor
Alessandro MAROCCOLO
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.)
Ferroli SpA
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Ferroli SpA
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Publication date
Application filed by Ferroli SpA filed Critical Ferroli SpA
Priority to PL15718080T priority Critical patent/PL3126737T3/pl
Publication of EP3126737A1 publication Critical patent/EP3126737A1/de
Application granted granted Critical
Publication of EP3126737B1 publication Critical patent/EP3126737B1/de
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12Radiant burners
    • F23D14/14Radiant burners using screens or perforated plates
    • F23D14/145Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/08Premix 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 axial outlets at the burner head
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2203/00Gaseous fuel burners
    • F23D2203/10Flame diffusing means
    • F23D2203/101Flame diffusing means characterised by surface shape
    • F23D2203/1017Flame diffusing means characterised by surface shape curved
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2900/00Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00003Fuel or fuel-air mixtures flow distribution devices upstream of the outlet

Definitions

  • the present invention relates to a pre-mixed gas burner cooled by an air-gas mixture.
  • a pre-mixed gas burner operates to produce a flame for generating heat by a controlled burning of a comburent air-fuel gas mixture.
  • a typical use application of a pre-mixed gas burner is a use in thermal generators for producing heat.
  • Such a burner is arranged in a combustion chamber upstream of a heat exchanger or directly in a heat exchanger.
  • High temperature fumes generated by the burner head flame are caused to flow through the heat exchanger and their heat is transferred to a heat conveyor fluid circulating in the exchanger.
  • the pre-mixed gas burners conventionally comprise a gaseous fuel and comburent air mixture feeding and mixing system, an air-gas mixture conveying system and a flame generating head having an outer surface thereon a flame is generated.
  • the burner head is heavily heated by the generated flame, in particular in a minimum power mode of operation, as the outlet speed of the air-gas mixture from the burner head is low and the flame is formed nearer to the burner surface.
  • the high temperature of the burner head besides limiting the burner head lifetime, requires to adopt insulating and/or refractory materials to protect the outer parts of the burner, not affected by the burner flame, and of the conveying system therethrough said air-gas mixture flows.
  • the heat transmitted to the burner parts near the burner head for example the conveyor, represents a dispersed heat.
  • US 2010/316967 A1 discloses a burner for gas fuels with premixing, comprising a burner body designed to be housed in a combustion chamber of a heating apparatus, the burner body being provided with a burner head on which an air and gas mixture supplied to the combustion chamber is burnt.
  • the burner head has a surface profile in the form of a dome-shaped spherical segment, the height of the dome being less than half of the diameter of the sphere to which the segment belongs.
  • CH 371 237 A discloses a gas burner comprising a radiator and a chamber which is connected to the supply source for the gas and in which the air-gas mixture is formed and which is terminated on the outlet side by a gas-permeable wall.
  • An intermediate wall is provided in the chamber for the passage of the mixture flow.
  • the gas-permeable wall consists of a plate provided with small holes which is combined with at least one net which rests against one of the surfaces of the gas-permeable wall, so that its meshes form with the holes of the wall passages, through which the combustion mixture arriving in the region of the network is guided.
  • US 5 355 841 A discloses a water heater comprising: a tank adapted to contain a body of water, in which the tank has a water inlet, a water outlet and a bottom; a combustion chamber defined by the tank bottom, a side wall substantially gas tightly sealed to the tank bottom and a bottom pan substantially gas tightly sealed to the side wall; a flue passing through the tank having an inlet in the tank bottom: a burner substantially gas tightly sealed along and to the side wall and adapted to contain combustion above the burner; a fuel and air proportioner adapted to admit air and fuel to the combustion chamber; and the combustion chamber being substantially gas tight except for the proportioner and the flue.
  • the aim of the present invention is to provide such a pre-mixed gas burner specifically designed for overcoming the above mentioned drawbacks of prior art burners.
  • a main object of the invention is to provide such a burner which is very simple construction wise and which, moreover, has a construction cost much lower than that of corresponding prior burners.
  • Another object of the present invention is to provide such a burner adapted to operate in a broad power modulating range, with a minimum power-maximum power ratio higher than 1:10.
  • Yet another object of the present invention is to provide such a burner which does not require a use of insulating and refractory materials.
  • Yet another object of the present invention is to provide such a burner which, owing to its specifically designed structural features, is very reliable and safe in operation.
  • an air and fuel or combustible gas mixture flows through the conveyor element and, as it arrives, through the distributing element, at the head of the burner, a burner flame is accordingly formed on an outer surface thereof.
  • the distributing element comprises a plurality of different throughgoing holes allowing an increased air-gas mixture amount to flow to the burner head regions devoid of holes and flame, thereby allowing said regions to be cooled; said conveyor element being furthermore thermally protected by the distributing element and the air-gas mixture flow.
  • the pre-mixed gas burner according to the present invention which has been generally indicated by the reference number 1, comprises a conveyor element 2, a burner head 3 and a distributing element 4.
  • the conveyor element 2 operates as a support and holder for the distributing element 4 and the burner head 3.
  • the conveyor element 2 is thermally protected by the distributing element 4 and the air-gas mixture flow, thereby preventing said conveyor element 2 from being overheated.
  • the burner head 3 has a convex shape and such a size as to fully close the combustion chamber 5 therewithin said burner head 3 is arranged.
  • said burner head 3 comprises a throughgoing hole pattern through the central region 6, whereas its outer crown is devoid of throughgoing holes.
  • an air-gas mixture 8 is ejected from the burner head holes, which mixture, directed on the outer surface of said burner head 3, provides a combustion reaction with a corresponding formation of a burning flame 7.
  • the mentioned convex configuration helps to properly mechanically stabilize the burner, while preventing individual flame fronts from overlapping one another, thereby providing a "cleaner" combustion mode of operation.
  • the geometry or pattern of said burner head 3 is, in the embodiment herein shown, a circular one, but said head may have any other desired configurations or patterns such as a square, rectangular, polygonal, elliptical configuration or pattern and so on.
  • the throughgoing hole pattern 6 of said head 3 has been specifically designed to provide a homogeneous flame and an optimum combustion.
  • throughgoing holes of different diameters are herein provided to drive the flame 7 on the burner surface.
  • the burner head 3 hole pattern 6 is, in the embodiment herein illustrated, a circular one, but it would also be possible to provide holes or openings of any other desired geometrical patterns, such as elongated slot, elliptical and rectangular hole patterns.
  • the hole size may be either a constant or an uneven one, and said holes may have an even or uneven geometry, thereby providing spaced regions of larger and smaller hole density and with either a constant or uneven hole pitch pattern.
  • the outermost portion of the head 3, that is the outer crown for a circular burner or a region near an outer perimeter for a polygonal burner, is devoid of holes and accordingly of flames.
  • the distributing element 4 coupled to the burner head 3 by a clamping connection 9 along the head perimeter.
  • the distributing element 4 has a convex shape and comprises a perforated distributing element surface, with uneven dimensions between the outer circular crown 10 and inner region 11, to allow the air-gas mixture to circulate between the distributing element and the burner head and to be evenly distributed through the outlet holes.
  • the enlarged hole cross-section along said crown or outer perimeter 10 is designed to facilitate an enhanced air-gas mixture conveying and feeding to the peripheral unperforated region of the burner head 3.
  • the above technical solution which represents a main feature of the present invention, allows a portion of the air-gas mixture to circulate between the distributing element 4 and the burner head 3, at said unperforated region.
  • the circulating air-gas mixture before being ejected from said holes and generating the flame will touch the burner head 3 surface at the region of said head 3 devoid of holes and flame, thereby removing heat therefrom and reducing its temperature.
  • the distributing element 4 further provides a thermal screening function of the underlying conveyor element 2 to protect the latter from the burner head 3 high temperature thereby preventing said conveyor from being overheated.
  • the specifically designed distributing element 4 hole pattern allows said element 4 to be properly cooled, by the same circulating air-gas mixture.
  • the invention has provided a pre-mixed gas burner overcoming the above prior art problems by a very simple safely operating and inexpensive structure, including a cooling system driven by the same air-gas mixture flowing through the burner, thereby greatly reducing the burner head flameless region temperature.
  • This enhanced cooling in combination with a burner head so designed as to tightly close the head combustion chamber, achieves in particular the object of avoiding any insulating refractory materials.
  • the burner according to the present invention can also operate with an air-gas mixture low outlet speed, and a flame very close to the burner head surface, thereby reducing the operating burner minimum power, while enhancing the power modulation range to a ratio higher than 1:10.
  • the different diameter burner head holes provide an optimum and homogeneous combustion through an "extended" power range of the inventive burner.
  • the convex shape and the clamping of burner head and distributing element provide the burner with an improved mechanical stability and lifetime, and a very simple burner construction.
  • the used materials, as well as the contingent size and shapes can be any, depending on requirements.

Claims (9)

  1. Vormischgasbrenner (1), umfassend ein Förderelement (2), einen Brennerkopf (3) mit Auslasslöchern und ein Verteilerelement (4), das zwischen dem Brennerkopf (3) und dem Förderelement (2) angeordnet ist, wobei das Verteilerelement (4) eine thermische Abschirmung des darunterliegenden Förderelements (2) bereitstellt und damit das darunterliegende Förderelement (2) gegen eine hohe Temperatur des Brennerkopfes (3) schützt und verhindert, dass das darunterliegende Förderelement (2) überhitzt wird; wobei das Lochmuster des Verteilerelements (4) erlaubt, dass es durch eine Luft-Gas-Gemisch(8)-Zirkulation gekühlt wird, und der Brennerkopf (3) einen peripheren Bereich aufweist, der frei von Auslasslöchern ist,
    dadurch gekennzeichnet, dass das Verteilerelement (4) eine Vielzahl von Löchern entlang seiner Krone (10) oder seines Außenumfangs umfasst, die einen vergrößerten Querschnitt aufweisen, und dadurch eine Zuführung des Luft-Gas-Gemisches (8) in den peripheren Bereich ermöglicht und dadurch verursacht, dass ein Teil des Luft-Gas-Gemisches (8) zwischen dem Verteilerelement (4) und dem Brennerkopf (3) zirkuliert; wobei das Luft-Gas-Gemisch (8) bei einer solchen Zirkulation vor Verlassen der Auslasslöcher des Brennerkopfes (3) und Erzeugen einer Flamme (7) eine Brennerkopffläche in dem flammenfreien, peripheren Bereich berührt und damit Wärme entfernt und eine Temperatur begrenzt.
  2. Brenner (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Verteilerelement (4) eine Vielzahl von verschiedenen Löchern umfasst, die eine vergrößerte Luft-Gas-Gemisch(8)-Menge am peripheren Bereich des Brennerkopfes hindurchfließen lassen, der frei von Auslassöffnungen und Flamme ist, und die dadurch für eine Abkühlung des Brennerkopfbereichs sorgen.
  3. Brenner (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Förderelement (2) das Verteilerelement (4) und den Brennerkopf (3) trägt und einschließt.
  4. Brenner (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Brennerkopf (3) eine konvexe Form und eine solche Größe aufweist, dass er eine Verbrennungskammer (5) vollkommen schließt, in welcher der Brennerkopf (3) angeordnet ist.
  5. Brenner (1) nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Brennerkopf (3) in einem zentralen Bereich eine Perforation umfasst.
  6. Brenner (1) nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Brennerkopf (3) eine konvexe Form aufweist, die mechanisch den Brenner (1) stabilisiert, während sie verhindert, dass individuelle Flammenfronten des Brenners sich überlappen, um Betriebsbedingungen für eine sauberere Verbrennung zu liefern.
  7. Brenner (1) nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Brennerkopf (3) Löcher mit verschiedenen Durchmessern umfasst, um die Brennerflamme (7) auf der Brennerfläche anzutreiben.
  8. Brenner (1) nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Verteilerelement (4) eine Größe aufweist, die gleich einer Größe des Brennerkopfes (3) ist, und an den Brennerkopf (3) durch Anklemmen entlang eines gesamten Brennerkopfperimeters gekoppelt ist.
  9. Brenner (1) nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Verteilerelement (4) eine konvexe Form aufweist und eine perforierte Oberfläche des Verteilerelements (4) umfasst, die eine verschiedene Größe zwischen einer äußeren kreisförmigen Krone (10) und einem inneren Bereich (11) aufweist, sodass das Luft-Gas-Gemisch (8) zwischen dem Verteilerelement (4) und dem Brennerkopf (3) zirkulieren kann, um gleichmäßig verteilt oder an Auslasslöcher geliefert zu werden.
EP15718080.3A 2014-04-04 2015-03-31 Mit einem luft-gas-gemisch gekühlter vormischbrenner Active EP3126737B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15718080T PL3126737T3 (pl) 2014-04-04 2015-03-31 Palnik gazowy z mieszaniem wstępnym chłodzony mieszanką gazowo-powietrzną

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20140612 2014-04-04
PCT/IB2015/000431 WO2015150902A1 (en) 2014-04-04 2015-03-31 Pre-mixed gas burner cooled by an air-gas mixture

Publications (2)

Publication Number Publication Date
EP3126737A1 EP3126737A1 (de) 2017-02-08
EP3126737B1 true EP3126737B1 (de) 2019-11-13

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ID=50897751

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Application Number Title Priority Date Filing Date
EP15718080.3A Active EP3126737B1 (de) 2014-04-04 2015-03-31 Mit einem luft-gas-gemisch gekühlter vormischbrenner

Country Status (5)

Country Link
EP (1) EP3126737B1 (de)
ES (1) ES2769814T3 (de)
PL (1) PL3126737T3 (de)
RU (1) RU2664267C2 (de)
WO (1) WO2015150902A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100016196A1 (it) 2021-06-21 2022-12-21 Ferroli Spa Cella di combustione per un sistema riscaldante

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH371237A (de) * 1957-10-24 1963-08-15 Pozzi Arnaldo Gasbrenner mit einem Strahlkörper
US3852025A (en) * 1973-09-28 1974-12-03 Int Magna Corp Infra-red heater
EP0598083B1 (de) * 1992-06-13 1996-04-24 VIESSMANN WERKE GmbH & CO. Strahlungsbrenner für heizkessel
US5355841A (en) * 1993-08-27 1994-10-18 Sabh (U.S.) Water Heater Group, Inc. Water heater with integral burner
ITPD20070363A1 (it) 2007-11-06 2009-05-07 Sit La Precisa Spa Bruciatore, in particolare bruciatore a gas con pre-miscelazione

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
PL3126737T3 (pl) 2020-06-01
RU2664267C2 (ru) 2018-08-15
RU2016135504A (ru) 2018-05-07
ES2769814T3 (es) 2020-06-29
WO2015150902A1 (en) 2015-10-08
RU2016135504A3 (de) 2018-07-04
EP3126737A1 (de) 2017-02-08

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