WO2015150902A1 - Brûleur à gaz pré-mélangés refroidi par un mélange air/gaz - Google Patents

Brûleur à gaz pré-mélangés refroidi par un mélange air/gaz Download PDF

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Publication number
WO2015150902A1
WO2015150902A1 PCT/IB2015/000431 IB2015000431W WO2015150902A1 WO 2015150902 A1 WO2015150902 A1 WO 2015150902A1 IB 2015000431 W IB2015000431 W IB 2015000431W WO 2015150902 A1 WO2015150902 A1 WO 2015150902A1
Authority
WO
WIPO (PCT)
Prior art keywords
burner
burner head
air
gas mixture
holes
Prior art date
Application number
PCT/IB2015/000431
Other languages
English (en)
Inventor
Alessandro MAROCCOLO
Original Assignee
Ferroli S.P.A.
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 Ferroli S.P.A. filed Critical Ferroli S.P.A.
Priority to PL15718080T priority Critical patent/PL3126737T3/pl
Priority to RU2016135504A priority patent/RU2664267C2/ru
Priority to EP15718080.3A priority patent/EP3126737B1/fr
Priority to ES15718080T priority patent/ES2769814T3/es
Publication of WO2015150902A1 publication Critical patent/WO2015150902A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • 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
    • F23D14/08—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 axial outlets at the burner head
    • 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
    • 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 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 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.
  • Figure 1 is a cross-sectioned side elevation view of the burner according to the present invention.
  • Figure 2 is a top plan view of the distributing element
  • Figure 3 is a top plan view of the conveyor.
  • 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 0 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 elements 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.

Abstract

L'invention concerne un brûleur à gaz pré-mélangés comprenant un élément de transport, une tête de brûleur et un élément de distribution agencé entre la tête de brûleur et l'élément de transport, dans lequel, pendant un fonctionnement du brûleur, un mélange d'air et de gaz combustible s'écoule à travers l'élément de transport, lequel, par le biais de l'élément de distribution, arrive au niveau de la tête de brûleur pour former une flamme sur la surface externe de la tête de brûleur, l'élément de distribution comprenant une pluralité de différents trous à travers lesquels une quantité de mélange air/gaz améliorée s'écoule vers des régions de la tête de brûleur sans trou ni flamme pour fournir un refroidissement amélioré de la tête de brûleur, l'élément de transport étant en outre protégé thermiquement par l'élément de distribution et l'écoulement du mélange air/gaz.
PCT/IB2015/000431 2014-04-04 2015-03-31 Brûleur à gaz pré-mélangés refroidi par un mélange air/gaz WO2015150902A1 (fr)

Priority Applications (4)

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
RU2016135504A RU2664267C2 (ru) 2014-04-04 2015-03-31 Газовая горелка с предварительным смешиванием
EP15718080.3A EP3126737B1 (fr) 2014-04-04 2015-03-31 Brûleur à pré-mélange refroidi par un mélange air-gaz
ES15718080T ES2769814T3 (es) 2014-04-04 2015-03-31 Quemador de gas premezclado enfriado por una mezcla de aire y gas

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2014A000612 2014-04-04
ITMI20140612 2014-04-04

Publications (1)

Publication Number Publication Date
WO2015150902A1 true WO2015150902A1 (fr) 2015-10-08

Family

ID=50897751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/000431 WO2015150902A1 (fr) 2014-04-04 2015-03-31 Brûleur à gaz pré-mélangés refroidi par un mélange air/gaz

Country Status (5)

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

Cited By (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

Citations (3)

* 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
US5355841A (en) * 1993-08-27 1994-10-18 Sabh (U.S.) Water Heater Group, Inc. Water heater with integral burner
US20100316967A1 (en) 2007-11-06 2010-12-16 Sit La Precisa S.P.A. Burner, specifically a premix gas burner

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852025A (en) * 1973-09-28 1974-12-03 Int Magna Corp Infra-red heater
EP0598083B1 (fr) * 1992-06-13 1996-04-24 VIESSMANN WERKE GmbH & CO. Bruleur radiant pour chaudiere de chauffage central

Patent Citations (3)

* 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
US5355841A (en) * 1993-08-27 1994-10-18 Sabh (U.S.) Water Heater Group, Inc. Water heater with integral burner
US20100316967A1 (en) 2007-11-06 2010-12-16 Sit La Precisa S.P.A. Burner, specifically a premix gas burner

Cited By (2)

* 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
EP4108985A1 (fr) 2021-06-21 2022-12-28 FERROLI S.p.A. Cellule de combustion pour un système de chauffage

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
EP3126737B1 (fr) 2019-11-13
RU2016135504A3 (fr) 2018-07-04
EP3126737A1 (fr) 2017-02-08

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