EP2385301A1 - Brûleur à gaz pour chaudière - Google Patents

Brûleur à gaz pour chaudière Download PDF

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Publication number
EP2385301A1
EP2385301A1 EP11164793A EP11164793A EP2385301A1 EP 2385301 A1 EP2385301 A1 EP 2385301A1 EP 11164793 A EP11164793 A EP 11164793A EP 11164793 A EP11164793 A EP 11164793A EP 2385301 A1 EP2385301 A1 EP 2385301A1
Authority
EP
European Patent Office
Prior art keywords
diffuser
covering means
combustion chamber
gas burner
burner
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Withdrawn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
EP11164793A
Other languages
German (de)
English (en)
Inventor
Antonio Acocella
Massimo Gilioli
Massimo Dotti
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 EP2385301A1 publication Critical patent/EP2385301A1/fr
Withdrawn legal-status Critical Current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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74—Preventing flame lift-off
    • 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
    • F23D14/26—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
    • 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
    • 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 gas burner for a gas boiler.
  • Gas boilers of the prior art comprise a conduit for feeding a burner with a premixed gas-air mixture, a burner for heat production through combustion of such mixture in a combustion chamber, and optionally a support element connectable to the heat exchanger and/or to the feeding conduit for ensuring the closure of the combustion chamber and/or for positioning the burner relative to such combustion chamber.
  • the burner further comprises a diffuser through which the premixed fuel and air gas is conveyed and which determines a flame scheme for heat production.
  • the diffuser usually comprises a wall provided with a plurality of openings and having an inside surface in fluid connection with the feeding conduit and thus in contact with the unburnt mixture, and an outside surface whereon the combustion takes place. It therefore defines a surface that in the present context is called outer combustion surface.
  • a distribution device or distributor, arranged on the diffuser side opposite to the combustion surface, usually comprising a wall with a plurality of through openings, configured so as to distribute the gas-air mixture in a substantially even manner or in any case in the desired manner towards the diffuser wall.
  • the heat produced by the combustion on the outer side of the diffuser wall is conveyed by the hot combustion gases to a heat exchanger for heating a fluid, for example water, that is then conveyed to a utility, for example to a heating system of an industrial process, of living environments or the like, and/or of sanitary water.
  • a fluid for example water
  • a utility for example to a heating system of an industrial process, of living environments or the like, and/or of sanitary water.
  • the width of the heating power range that is, the so-called modulation (ratio between minimum power and maximum power) of the prior art burners is limited. This is due to the fact that when the fuel flow rate goes beyond an optimal range that depends on the material, from the specific passage area (rate between the passage area and the wall area) and from the resistance to the diffuser flow, there occur flame instability problems that impair the proper burner operation.
  • Such phenomenon of detachment of the flame from the diffuser is particularly important at the diffuser ends that are connected to the frame due to temperature that, in such areas, is unavoidably lower.
  • the object of the present invention is to provide a burner that allows a high power modulation while obviating the above problems of flame instability, and in particular the problem of blow-off.
  • a gas burner for a boiler comprising a diffuser, suitable for diffusing premixed combustion gases in a combustion chamber, wherein the burner further comprises covering means of the flow of mixture entering the combustion chamber which are arranged on the side of the diffuser opposite to the combustion chamber and at peripheral portions of the diffuser, said covering means being configured so as to give the direction of the flow of mixture entering the combustion chamber, at such peripheral portions, a component parallel to the diffuser and said covering means being at least partially in contact with the diffuser.
  • said covering means reducing the mixture flow at the peripheral portions of the distributor, allow preventing the blow-off problem even with high power modulations.
  • a gas burner for a boiler is globally indicated with reference number 1.
  • reference number 1 indicates a burner that produces heat by the combustion of a premixed fuel gas, generally comprising fuel gas and air.
  • a premixed fuel gas generally comprising fuel gas and air.
  • fuel gases are totally premixed, that is, no further component is added to the mixture supplied to the burner.
  • Burner 1 comprises a diffuser 2, which is suitable for diffusing combustion gases in a combustion chamber 3 (shown with a dashed line in figure 1 ).
  • Burner 1 is mounted on a frame 9. The latter may be connected to the combustion chamber 3 by connecting portions.
  • Frame 9 further delimits an opening for the passage of the fuel and air mixture.
  • Diffuser 2 includes a wall provided with a plurality of openings whose inside surface is in fluid connection with the gas feeding conduit. The combustion takes place on the outside surface of such wall.
  • Diffuser 2 may comprise a distributor 4 of the known type, suitable for distributing the mixture to diffuser 2 and arranged on the side of diffuser 2 opposite the combustion chamber 3.
  • Figure 1 also shows a schematic representation of a heat exchanger 6 in contact with the combustion chamber 3, which is suitable for receiving the heat produced by the combustion on the outer side of the wall of diffuser 2.
  • burner 1 comprises covering means 5 of the flow of mixture entering the combustion chamber 3.
  • the covering means 5 are arranged on the side of diffuser 2 opposite to the combustion chamber 3 and at peripheral portions of diffuser 2.
  • peripheral portions of the diffuser it is meant the ends of the diffuser that extend along the entire perimeter of the same diffuser.
  • diffuser 2 comprises a distributor 4
  • covering means 5 are arranged on distributor 4.
  • the covering means 5 are configured so as to give the direction of the flow of mixture entering the combustion chamber 3, at such peripheral portions, a component parallel to diffuser 2.
  • the covering means 5 deviate the mixture flow at the peripheral portions of diffuser 2 as shown by arrows 7' in figure 3 .
  • the flow that is initially perpendicular to diffuser 2 (arrows 7), is deviated by such covering means 5 and is able to filter through the air spaces of diffuser 2 and any air space present between said means 5 and diffuser 2.
  • the flow mixture entering the combustion chamber 3, at the peripheral portions of the distributor is less than the mixture flow entering the combustion chamber 3 at the central portions of the diffuser 2.
  • the covering means 5 are arranged at a peripheral portion of the diffuser 2 that extends for a surface equal to at least 2/5 of the total surface of diffuser 2.
  • such covering means 5 are arranged at a peripheral portion of diffuser 2 having a width comprised between about 10 mm and about 25 mm, more preferably said width is comprised between about 10 mm and about 15 mm. According to a particularly preferred embodiment, it is equal to about 10 mm.
  • Such values are referred to household boilers, of course the values of such peripheral portions in industrial boilers shall be suitably calculated according to the boiler dimensions.
  • the covering means 5 are integral with frame 9 of burner 1.
  • the covering means. 5 comprise a metal plate.
  • the covering means 5 comprise a film.
  • the covering means 5 may be parallel to diffuser 2 at the peripheral portions thereof.
  • the outline of the covering means 5 follows the outline of the peripheral portions of diffuser 2, thus if the latter are curved, the covering means are curved too.
  • the covering means 5 are at least partly in contact with diffuser 2, as shown in figures 2-6 .
  • the covering means 5 are configured so as to gradually, in particular increasingly, cover the peripheral portions of diffuser 2.
  • they are configured so as to gradually approach diffuser 2 proceeding in the direction that goes from the centre of diffuser 2 towards the peripheral portions thereof, that is, towards frame 9.
  • the covering means 5 include a metal plate whose profile comprises an outer portion 7 in contact with diffuser 2 and an inner portion 8 spaced apart from diffuser 2.
  • the latter is connected to the outer portion 7 by a jointing portion 10 of the gradual type, however the jointing portion 10 may also be of step-wise, that is, having an inclination variation substantially great in a substantially small space.
  • burner 1 comprises an additional distribution wall 11 arranged at the central portion of diffuser 2.
  • additional distribution wall 11 allows regulating the flow also at the central zone of diffuser 2 and thus it further increases the modulation of burner 1.
  • the geometry of the covering means 5 depends on the geometry of burner 1 and thus of diffuser 2.
  • said covering means 5 in case of flat diffuser 2, said covering means 5 have a substantially plane configuration, as shown in the embodiments illustrated in figures 2-5 ; in case of convex diffuser 2 relative to the combustion chamber 3, said covering means 5 have a substantially convex configuration.
  • the covering means 5 have a cylindrical configuration, as shown in figure 6 that illustrates the fourth embodiment of the present invention.
  • the covering means 5 have a frusto-conical configuration.
  • diffuser 2 comprises a metal or ceramic sheet or grid woven in wires or fibres or a metal or ceramic sintered material or a compact material having openings.
  • distributor 4 comprises a pierced or micro-stretched sheet or a metal mesh or a porous material.
  • the present invention also discloses a method for operating a gas burner 1 for a boiler provided with a diffuser 2, suitable for diffusing combustion gases in a combustion chamber 3. Such method comprises the steps of:
  • the step of giving a component parallel to diffuser 2 is carried out through covering means 5 arranged on the side of diffuser 2 opposite to the combustion chamber 3 and at the peripheral portions of diffuser 2.
  • Such covering means 5 are of the type described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Gas Separation By Absorption (AREA)
  • Feeding And Controlling Fuel (AREA)
EP11164793A 2010-05-05 2011-05-04 Brûleur à gaz pour chaudière Withdrawn EP2385301A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2010A000791A IT1399919B1 (it) 2010-05-05 2010-05-05 Bruciatore a gas per caldaia

Publications (1)

Publication Number Publication Date
EP2385301A1 true EP2385301A1 (fr) 2011-11-09

Family

ID=43478432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11164793A Withdrawn EP2385301A1 (fr) 2010-05-05 2011-05-04 Brûleur à gaz pour chaudière

Country Status (2)

Country Link
EP (1) EP2385301A1 (fr)
IT (1) IT1399919B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012123805A1 (fr) * 2011-03-11 2012-09-20 Bertelli & Partners S.R.L. Brûleur à gaz perfectionné pour une combustion prémélangée
CN103574605A (zh) * 2012-07-17 2014-02-12 罗伯特·博世有限公司 面型燃烧器和用于监测面型燃烧器中的火焰形成的方法
DE202019103989U1 (de) 2018-07-19 2019-07-29 Orkli, S. Coop. Gasbrenner

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1520402A (en) * 1974-07-30 1978-08-09 Mitsubishi Electric Corp Combustion apparatus
JPS6099926A (ja) * 1983-11-07 1985-06-03 Matsushita Electric Ind Co Ltd 燃焼装置
US4657506A (en) * 1984-12-10 1987-04-14 Glowcore Corporation Gas burner
JPH01277104A (ja) * 1988-04-27 1989-11-07 Matsushita Electric Ind Co Ltd 低騒音型バーナ
US4960378A (en) * 1987-09-26 1990-10-02 Ruhrgas Aktiengesellschaft Gas burner
EP0472270A1 (fr) * 1990-06-21 1992-02-26 Furigas (U.K.) Limited Brûleur à gaz
US5355841A (en) * 1993-08-27 1994-10-18 Sabh (U.S.) Water Heater Group, Inc. Water heater with integral burner
WO2008125796A1 (fr) * 2007-04-12 2008-10-23 Mont Selas Limited Dispositif de brûleur

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1520402A (en) * 1974-07-30 1978-08-09 Mitsubishi Electric Corp Combustion apparatus
JPS6099926A (ja) * 1983-11-07 1985-06-03 Matsushita Electric Ind Co Ltd 燃焼装置
US4657506A (en) * 1984-12-10 1987-04-14 Glowcore Corporation Gas burner
US4960378A (en) * 1987-09-26 1990-10-02 Ruhrgas Aktiengesellschaft Gas burner
JPH01277104A (ja) * 1988-04-27 1989-11-07 Matsushita Electric Ind Co Ltd 低騒音型バーナ
EP0472270A1 (fr) * 1990-06-21 1992-02-26 Furigas (U.K.) Limited Brûleur à gaz
US5355841A (en) * 1993-08-27 1994-10-18 Sabh (U.S.) Water Heater Group, Inc. Water heater with integral burner
WO2008125796A1 (fr) * 2007-04-12 2008-10-23 Mont Selas Limited Dispositif de brûleur

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012123805A1 (fr) * 2011-03-11 2012-09-20 Bertelli & Partners S.R.L. Brûleur à gaz perfectionné pour une combustion prémélangée
CN103574605A (zh) * 2012-07-17 2014-02-12 罗伯特·博世有限公司 面型燃烧器和用于监测面型燃烧器中的火焰形成的方法
EP2687781A3 (fr) * 2012-07-17 2017-12-13 Robert Bosch GmbH Brûleur à platine et procédé de surveillance d'une formation de flammes pour une brûleur à platine
DE202019103989U1 (de) 2018-07-19 2019-07-29 Orkli, S. Coop. Gasbrenner

Also Published As

Publication number Publication date
ITMI20100791A1 (it) 2011-11-06
IT1399919B1 (it) 2013-05-09

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