EP2663807A2 - High perimetral stability burner - Google Patents

High perimetral stability burner

Info

Publication number
EP2663807A2
EP2663807A2 EP12705415.3A EP12705415A EP2663807A2 EP 2663807 A2 EP2663807 A2 EP 2663807A2 EP 12705415 A EP12705415 A EP 12705415A EP 2663807 A2 EP2663807 A2 EP 2663807A2
Authority
EP
European Patent Office
Prior art keywords
diffuser
burner
radius
peripheral portions
section
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
EP12705415.3A
Other languages
German (de)
French (fr)
Other versions
EP2663807B1 (en
Inventor
Luca Barozzi
Francesco FANTONI
Antonio Acocella
Massimo Gilioli
Massimo Dotti
Tullio PALTRINIERI
Paolo GILLI
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 EP2663807A2 publication Critical patent/EP2663807A2/en
Application granted granted Critical
Publication of EP2663807B1 publication Critical patent/EP2663807B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • 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
    • F23D14/46—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
    • 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
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/103—Flame diffusing means using screens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/105—Porous 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2209/00—Safety arrangements
    • F23D2209/20—Flame lift-off / stability
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/10—Burner material specifications ceramic
    • F23D2212/103—Fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2212/00—Burner material specifications
    • F23D2212/20—Burner material specifications metallic
    • F23D2212/203—Particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/13002—Energy recovery by heat storage elements arranged in the combustion chamber

Definitions

  • the present invention relates to a high perimeter stability burner for a gas boiler.
  • Gas boilers of the prior art comprise: a conduit for supplying a burner with a premixed gas-air mixture, a burner for the production of heat through the combustion of said mixture in a combustion chamber, and possibly a support element which may be connected to the heat exchanger and/or to the supply conduit to ensure the closure of the combustion chamber and/or for positioning the burner with respect to such combustion chamber.
  • the burner comprises a diffuser through which the premixed fuel and air gas which determines a flame pattern for the production of heat is conveyed.
  • the diffuser comprises a wall provided with a plurality of openings and having an inner surface fluidically connected with the supply conduit, and thus in contact with the unburnt mixture, and an outer surface whereon the combustion occurs.
  • a distribution device, or distributor may also be provided arranged on the side of the diffuser 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 uniform manner or however in the desired manner towards the wall of the diffuser.
  • the heat produced by the combustion on the outer side of the wall of the diffuser is conveyed through the hot fuel gases to a heat exchanger for heating a fluid, for example water, which is subsequently conveyed to a user, for example to a heating system of an industrial process, residential environments or the like and/or domestic water .
  • a fluid for example water
  • the width of the heating power range or the so-called modulation (ratio between maximum power and minimum power) of the burners of the prior art is limited. This is due to the fact that, when the fuel flow rate exceeds the optimal range which depends on the material, the specific area of passage (quotient between the passage area and the wall area) and the resistance of the diffuser to the mixture flow, problems related to instability of the flame occur which jeopardise the correct operation of the burner. In particular, upon increasing the heating power, the combustion area, and thus the flame, tends to move away from the diffuser with serious effects in terms of safety and emission of pollutant substances, such as carbon monoxide (CO) .
  • CO carbon monoxide
  • Such phenomenon of the flame moving away from the diffuser is particularly relevant at the ends of the diffuser .
  • the object of the present invention is to provide a burner capable of overcoming the aforementioned flame instability problems, and in particular the problem related to the flame detachment and which is simultaneously simple and inexpensive to produce .
  • a gas boiler burner comprising a diffuser, suitable for diffusing premixed fuel gases in a combustion chamber, each cross-section of said diffuser having a uniform radius of curvature, wherein said diffuser comprises a diffuser central portion and two diffuser longitudinally peripheral portions, said two diffuser longitudinally peripheral portions being connected together through said diffuser central portion, said diffuser central portion extending longitudinally in a direction perpendicular to the fuel gas flow for a length 1 greater than zero and having a cross-section shaped as a circumference arc having a radius r, each of said diffuser longitudinally peripheral portions being shaped as a portion of sphere having radius r.
  • Such particular configuration of the diffuser allows attaining a flame stability also in case of increase of the heating power and also at the ends of the diffuser.
  • the aforementioned configuration allows obtaining a flow direction of the fuel gases exiting from the diffuser whose component in the direction perpendicular to the surface of the diffuser at the edges thereof is substantially null.
  • it is possible to reduce the mixture flow at the edges and prevent the flame detachment phenomenon, also with high power modulations.
  • gas flow direction is used to indicate the main direction of flow of the gases.
  • the expression "the cross-section has a uniform radius of curvature” is used to indicate that each point of the cross-section has the same radius of curvature, i.e. it belongs to the same hypothetical circumference having such radius .
  • FIG. 1 is a longitudinal sectional view of a boiler portion comprising a gas burner according to the present invention
  • - figure 2 is a perspective view of a gas boiler burner according to a first embodiment of the invention
  • - figure 3 is a perspective view of a gas boiler burner according to an embodiment of the invention, mounted on a framework;
  • FIG. 4 is a side view of the burner of figure
  • FIG. 5 is the view along the cross-section B-B of the burner of figure 4.
  • a gas boiler burner is wholly indicated with reference number 1.
  • reference 1 indicates a burner which produces heat through 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 completely premixed, i.e. no further component is added to the mixture supplied to the burner.
  • the burner 1 comprises a diffuser 2, which is suitable for diffusing fuel gases in a combustion chamber 3 (indicated with a dotted line in figure 1) .
  • the burner 1 is mounted on a framework 9. The latter may be connected to the combustion chamber 3 through connection portions.
  • the framework 9 further delimits an opening for the passage of the fuel and air mixture.
  • the diffuser 2 includes a wall provided with a plurality of openings whose inner surface is fluidically connected with the gas supply conduit. The combustion occurs on the outer surface of such wall.
  • the diffuser 2 may comprise a distributor 4 of the known type, suitable for distributing the mixture to the diffuser 2 and arranged on the side of the diffuser 2 opposite to 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 the diffuser 2.
  • a longitudinal direction a As shown in figure 2, three main directions have been identified: a longitudinal direction a, a transverse direction ⁇ and a radial direction ⁇ .
  • the longitudinal direction a and the transverse direction ⁇ are orthogonal to each other and they are both orthogonal to the direction of flow of the gases entering into the burner 1, which is indicated in the figures with the arrows 7.
  • each cross- section of said diffuser 2 has a uniform radius of curvature.
  • each section obtained intersecting the diffuser 2 with a plane parallel to the plane B-B of figure 4 has a single radius of curvature, i.e. each point of the section belongs to an ideal circumference having such radius of curvature .
  • the diffuser 2 comprises a diffuser central portion 10 and two diffuser longitudinally peripheral portions 5, in which said two diffuser longitudinally peripheral portions 5 are connected to each other by said diffuser central portion 10.
  • the diffuser central portion 10 extends longitudinally in a direction perpendicular to the flow of the fuel gases, i.e. in the longitudinal direction a, over a length 1 greater than zero.
  • the diffuser central portion 10 has a cross-section shaped as a circumference arc having a radius r, as shown in figure 5.
  • the cross- section is preferably a semi-circumference.
  • the diffuser central portion 10 extends transversely over a length equivalent to 2r.
  • Each of said diffuser longitudinally peripheral portions 5 is shaped as a portion of sphere having radius r, as shown in figure 4.
  • each of said portions is shaped as a quarter of sphere.
  • the radius of the spherical portion which forms each peripheral longitudinal portion of the diffuser 5 has a length equivalent to the radius of the cross-section of the central diffuser portion 10.
  • the burner 1 also comprises a distributor 4 associated to the diffuser 2 and suitable for distributing the fuel gases on the diffuser 2, which has a configuration substantially equivalent to the configuration of the diffuser 2. This is particularly observable in figure 5.
  • Said distributor 4 comprises a sheet provided with openings or a metal mesh or a porous material.
  • the diffuser 2 instead, comprises a mesh made of metal or ceramic fibres or a compact material having openings or a porous material.
  • the diffuser 2 is connected to a framework 9 which is arranged substantially perpendicular to the direction of flow of the fuel gases entering the burner 1, indicated by the arrows 7.
  • each longitudinally peripheral portion of the diffuser 5 is shaped as a circumference arc having a radius r, thus the edges of the longitudinal section of the diffuser 2 have the same characteristics of the edges of the cross-section of the diffuser 2.
  • the normal component of the direction of flow of the exiting gases is minimum along all the perimeter edges of the diffuser 2 and thus the flame detachment phenomenon, critical in such areas, is controlled.
  • gas boiler burner according to the present invention may be subjected, by a man skilled in the art, with the aim of meeting contingent and specific requirements, to further modifications and variants all falling within scope of protection of the invention .

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)

Abstract

Herein a gas boiler burner (1) is described comprising a diffuser (2), suitable for diffusing premixed fuel gases in a combustion chamber (3), each cross-section of said diffuser (2) having a uniform radius of curvature, in which said diffuser (2) comprises a diffuser central portion (10) and two diffuser longitudinally peripheral portions (5), said two diffuser longitudinally peripheral portions (5) being connected together through said central diffuser portion (10), said central diffuser portion (10) extending longitudinally in a direction perpendicular to the flow of the fuel gases over a length 1 greater than zero and having a cross-section shaped as a circumference arc having a radius r, each of said diffuser longitudinally peripheral portions (5) being shaped as a portion of sphere having radius r.

Description

DESCRIPTION
"High perimeter stability burner"
The present invention relates to a high perimeter stability burner for a gas boiler.
Gas boilers of the prior art comprise: a conduit for supplying a burner with a premixed gas-air mixture, a burner for the production of heat through the combustion of said mixture in a combustion chamber, and possibly a support element which may be connected to the heat exchanger and/or to the supply conduit to ensure the closure of the combustion chamber and/or for positioning the burner with respect to such combustion chamber.
The burner comprises a diffuser through which the premixed fuel and air gas which determines a flame pattern for the production of heat is conveyed. Usually the diffuser comprises a wall provided with a plurality of openings and having an inner surface fluidically connected with the supply conduit, and thus in contact with the unburnt mixture, and an outer surface whereon the combustion occurs.
Upstream of the diffuser (with reference to the direction of flow of the gas-air mixture) a distribution device, or distributor, may also be provided arranged on the side of the diffuser 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 uniform manner or however in the desired manner towards the wall of the diffuser.
As it is well known, the heat produced by the combustion on the outer side of the wall of the diffuser is conveyed through the hot fuel gases to a heat exchanger for heating a fluid, for example water, which is subsequently conveyed to a user, for example to a heating system of an industrial process, residential environments or the like and/or domestic water .
Due to the specific needs of a controlled and differentiated heating it is essential to be able to vary the heating power of the burner.
It is possible to control the heating power of the burner through the variation of the flow rate of the fuel or of the mixture supplied to the diffuser. However, the width of the heating power range or the so-called modulation (ratio between maximum power and minimum power) of the burners of the prior art is limited. This is due to the fact that, when the fuel flow rate exceeds the optimal range which depends on the material, the specific area of passage (quotient between the passage area and the wall area) and the resistance of the diffuser to the mixture flow, problems related to instability of the flame occur which jeopardise the correct operation of the burner. In particular, upon increasing the heating power, the combustion area, and thus the flame, tends to move away from the diffuser with serious effects in terms of safety and emission of pollutant substances, such as carbon monoxide (CO) .
Such phenomenon of the flame moving away from the diffuser is particularly relevant at the ends of the diffuser .
As a matter of facts, such ends are connected with the framework of the burner hence the temperature of the diffuser, in such areas, is inevitably lower than in the remaining areas.
In order to overcome this problem, the use of additional distributors in proximity of the diffuser or the use of diffusers suitably shaped by moulding is known. Both solutions are however complex in terms of manufacture and considerably affect the burner manufacturing costs.
Thus, the object of the present invention is to provide a burner capable of overcoming the aforementioned flame instability problems, and in particular the problem related to the flame detachment and which is simultaneously simple and inexpensive to produce .
This and other objects are attained by means of a gas boiler burner comprising a diffuser, suitable for diffusing premixed fuel gases in a combustion chamber, each cross-section of said diffuser having a uniform radius of curvature, wherein said diffuser comprises a diffuser central portion and two diffuser longitudinally peripheral portions, said two diffuser longitudinally peripheral portions being connected together through said diffuser central portion, said diffuser central portion extending longitudinally in a direction perpendicular to the fuel gas flow for a length 1 greater than zero and having a cross-section shaped as a circumference arc having a radius r, each of said diffuser longitudinally peripheral portions being shaped as a portion of sphere having radius r.
Such particular configuration of the diffuser allows attaining a flame stability also in case of increase of the heating power and also at the ends of the diffuser.
In particular, the aforementioned configuration allows obtaining a flow direction of the fuel gases exiting from the diffuser whose component in the direction perpendicular to the surface of the diffuser at the edges thereof is substantially null. Thus, it is possible to reduce the mixture flow at the edges and prevent the flame detachment phenomenon, also with high power modulations.
Herein the term "gas flow direction" is used to indicate the main direction of flow of the gases.
For the purpose of the present invention, the expression "the cross-section has a uniform radius of curvature" is used to indicate that each point of the cross-section has the same radius of curvature, i.e. it belongs to the same hypothetical circumference having such radius .
In order to better understand the invention and appreciate the advantages thereof, hereinafter a description of some exemplifying and non-limiting embodiments of the burner of the invention is provided, with reference to the attached figures, wherein :
- figure 1 is a longitudinal sectional view of a boiler portion comprising a gas burner according to the present invention;
- figure 2 is a perspective view of a gas boiler burner according to a first embodiment of the invention; - figure 3 is a perspective view of a gas boiler burner according to an embodiment of the invention, mounted on a framework;
- figure 4 is a side view of the burner of figure
3;
- figure 5 is the view along the cross-section B-B of the burner of figure 4; and
- figures 6a-6c show the vectorial breakdown of some flow lines of the fuel gases along the section of figure 5.
With reference to figures 1-6, a gas boiler burner, is wholly indicated with reference number 1.
In particular, reference 1 indicates a burner which produces heat through the combustion of a premixed fuel gas, generally comprising fuel gas and air. Preferably, such fuel gases are completely premixed, i.e. no further component is added to the mixture supplied to the burner.
The burner 1 comprises a diffuser 2, which is suitable for diffusing fuel gases in a combustion chamber 3 (indicated with a dotted line in figure 1) .
The burner 1 is mounted on a framework 9. The latter may be connected to the combustion chamber 3 through connection portions.
The framework 9 further delimits an opening for the passage of the fuel and air mixture.
The diffuser 2 includes a wall provided with a plurality of openings whose inner surface is fluidically connected with the gas supply conduit. The combustion occurs on the outer surface of such wall.
The diffuser 2 may comprise a distributor 4 of the known type, suitable for distributing the mixture to the diffuser 2 and arranged on the side of the diffuser 2 opposite to 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 the diffuser 2.
As shown in figure 2, three main directions have been identified: a longitudinal direction a, a transverse direction β and a radial direction γ. The longitudinal direction a and the transverse direction β are orthogonal to each other and they are both orthogonal to the direction of flow of the gases entering into the burner 1, which is indicated in the figures with the arrows 7.
According to the present invention, each cross- section of said diffuser 2 has a uniform radius of curvature. In other words, each section obtained intersecting the diffuser 2 with a plane parallel to the plane B-B of figure 4 has a single radius of curvature, i.e. each point of the section belongs to an ideal circumference having such radius of curvature .
According to the present invention, the diffuser 2 comprises a diffuser central portion 10 and two diffuser longitudinally peripheral portions 5, in which said two diffuser longitudinally peripheral portions 5 are connected to each other by said diffuser central portion 10. The diffuser central portion 10 extends longitudinally in a direction perpendicular to the flow of the fuel gases, i.e. in the longitudinal direction a, over a length 1 greater than zero. Furthermore the diffuser central portion 10 has a cross-section shaped as a circumference arc having a radius r, as shown in figure 5.
In particular as shown in such figure, the cross- section is preferably a semi-circumference.
Therefore, the diffuser central portion 10, extends transversely over a length equivalent to 2r.
Each of said diffuser longitudinally peripheral portions 5 is shaped as a portion of sphere having radius r, as shown in figure 4.
In particular, as shown in such figure, each of said portions is shaped as a quarter of sphere.
In other words, the radius of the spherical portion which forms each peripheral longitudinal portion of the diffuser 5 has a length equivalent to the radius of the cross-section of the central diffuser portion 10.
According to the preferred embodiment shown in the figures, the burner 1 also comprises a distributor 4 associated to the diffuser 2 and suitable for distributing the fuel gases on the diffuser 2, which has a configuration substantially equivalent to the configuration of the diffuser 2. This is particularly observable in figure 5.
Said distributor 4 comprises a sheet provided with openings or a metal mesh or a porous material.
The diffuser 2, instead, comprises a mesh made of metal or ceramic fibres or a compact material having openings or a porous material.
According to preferred embodiments, the diffuser 2 is connected to a framework 9 which is arranged substantially perpendicular to the direction of flow of the fuel gases entering the burner 1, indicated by the arrows 7.
In figures 6a-6c, the arrow indicated with the reference number 7' shows the direction of flow of the gases exiting from the burner 1.
As observable from such figures, the nearer to the ends of the cross-section the more the normal component on the diffuser 2 of the direction of flow of the gases exiting from the burner 1 decreases.
Therefore, such normal component will be minimum at the edges and maximum at the vertex of the circumference arc which constitutes the section.
Such phenomenon compensates the temperature drop typical of the ends for connection to the framework 9, thus avoiding the flame detachment in such critical areas .
The situation is analogous at the longitudinal section of the diffuser 2 in that each longitudinally peripheral portion of the diffuser 5 is shaped as a circumference arc having a radius r, thus the edges of the longitudinal section of the diffuser 2 have the same characteristics of the edges of the cross-section of the diffuser 2.
In other words, the nearer to the ends of the longitudinal section the more the normal component on the diffuser 2 of the direction of flow of the gases exiting from the burner 1 decreases.
Therefore, such normal component will be minimum at the edges and then gradually increase up to reaching a maximum at the entire length 1 of the diffuser central portion 10.
Hence, the normal component of the direction of flow of the exiting gases is minimum along all the perimeter edges of the diffuser 2 and thus the flame detachment phenomenon, critical in such areas, is controlled.
Therefore, such configuration of the burner 1, allows obtaining a flame stability also in case of increase of the heating power and simultaneously a burner that is simple and inexpensive to produce.
Within the description above and in the subsequent claims, all the numerical values indicating amounts, parameters, percentages, and so on and so forth shall be deemed preceded under any circumstances by the term "about" unless otherwise indicated. Furthermore, all numerical value intervals include all possible combinations of the maximum and minimum numerical values and all possible intermediate intervals, besides those specifically indicated in the text.
The gas boiler burner according to the present invention may be subjected, by a man skilled in the art, with the aim of meeting contingent and specific requirements, to further modifications and variants all falling within scope of protection of the invention .

Claims

1. Burner (1) for gas boiler comprising a diffuser (2), suitable for diffusing premixed fuel gases in a combustion chamber (3), each cross-section of said diffuser (2) having a uniform radius of curvature, wherein said diffuser (2) comprises a diffuser central portion (10) and two diffuser longitudinally peripheral portions (5), said two diffuser longitudinally peripheral portions (5) being connected together through said diffuser central portion (10) , said diffuser central portion (10) longitudinally extending in a direction perpendicular to the fuel gas flow for a length 1 greater than zero and having a cross-section being shaped as a circumference arc having a radius r, each of said diffuser longitudinally peripheral portions (5) being shaped as a portion of sphere having radius r.
2. Burner (1) according to claim 1, further comprising a distributor (4), associated to the diffuser (2) suitable for distributing fuel gases on the diffuser (2), having a shape substantially equal to that of the diffuser (2) .
3. Burner (1) according to claim 2, wherein said distributor (4) comprises a metal sheet provided with openings or a metal net or a porous material.
4. Burner (1) according to any one of the previous claims, wherein said diffuser (2) comprises a mesh made of metal or ceramic fibres or of a compact material having openings or a porous material .
5. Burner (1) according to any one of the previous claims, wherein the diffuser (2) is connected to a frame (9) substantially perpendicular to the flow direction of the fuel gas.
EP12705415.3A 2011-01-12 2012-01-11 High perimetral stability gas burner Active EP2663807B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2011A000019A IT1406865B1 (en) 2011-01-12 2011-01-12 BURNER WITH HIGH PERIMETER STABILITY
PCT/IB2012/050135 WO2012095799A2 (en) 2011-01-12 2012-01-11 High perimeter stability burner

Publications (2)

Publication Number Publication Date
EP2663807A2 true EP2663807A2 (en) 2013-11-20
EP2663807B1 EP2663807B1 (en) 2017-04-05

Family

ID=43975364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12705415.3A Active EP2663807B1 (en) 2011-01-12 2012-01-11 High perimetral stability gas burner

Country Status (8)

Country Link
US (1) US20140011143A1 (en)
EP (1) EP2663807B1 (en)
KR (1) KR101965676B1 (en)
CN (1) CN103429959B (en)
IT (1) IT1406865B1 (en)
RU (1) RU2585669C2 (en)
UA (1) UA112538C2 (en)
WO (1) WO2012095799A2 (en)

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ITMI20131968A1 (en) * 2013-11-26 2015-05-27 Worgas Bruciatori Srl BURNER
ITUA20164076A1 (en) * 2016-06-03 2017-12-03 Worgas Bruciatori Srl BURNER
CN109716023B (en) * 2016-09-13 2021-06-18 贝卡尔特燃烧技术股份有限公司 Premix gas burner
EP3652484A1 (en) * 2017-07-13 2020-05-20 Bekaert Combustion Technology B.V. Premix gas burner
US10711998B2 (en) 2017-10-03 2020-07-14 Lennox Industries Inc. Fresh air intake for low NOx emission furnace
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EP2663807B1 (en) 2017-04-05
KR20140051818A (en) 2014-05-02
CN103429959A (en) 2013-12-04
IT1406865B1 (en) 2014-03-14
ITMI20110019A1 (en) 2012-07-13
CN103429959B (en) 2015-09-30
US20140011143A1 (en) 2014-01-09
UA112538C2 (en) 2016-09-26
WO2012095799A2 (en) 2012-07-19
WO2012095799A3 (en) 2012-11-29
RU2585669C2 (en) 2016-06-10
RU2013137417A (en) 2015-02-20
KR101965676B1 (en) 2019-04-04

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