EP3513123B1 - Brûleur de gaz pré-mélangé - Google Patents

Brûleur de gaz pré-mélangé Download PDF

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Publication number
EP3513123B1
EP3513123B1 EP17761904.6A EP17761904A EP3513123B1 EP 3513123 B1 EP3513123 B1 EP 3513123B1 EP 17761904 A EP17761904 A EP 17761904A EP 3513123 B1 EP3513123 B1 EP 3513123B1
Authority
EP
European Patent Office
Prior art keywords
burner
premix gas
wire mesh
woven wire
metal plate
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
EP17761904.6A
Other languages
German (de)
English (en)
Other versions
EP3513123A1 (fr
Inventor
Roelof BOER
Daniel HOLTROP
René VAN ZUTPHENT
Geert Folkers
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.)
Bekaert Combustion Technology BV
Original Assignee
Bekaert Combustion Technology BV
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.)
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Publication date
Application filed by Bekaert Combustion Technology BV filed Critical Bekaert Combustion Technology BV
Publication of EP3513123A1 publication Critical patent/EP3513123A1/fr
Application granted granted Critical
Publication of EP3513123B1 publication Critical patent/EP3513123B1/fr
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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
    • F23D14/12—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
    • 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

Definitions

  • the invention relates to the field of premix gas burners, more particularly to surface stabilized premix gas burners comprising a woven wire mesh as burner deck.
  • US5474443A discloses a premix gas burner with a hemispherical burner deck out of a woven wire mesh.
  • US2005/172915 shows a premix gas burner having a woven wire mesh combustion surface comprising rigidizing ribs.
  • EP2876369A1 discloses a gas burner for a boiler.
  • the burner comprises a combustion membrane with a diffuser layer in the shape of a three-dimensional shell forming an outer combustion surface with at least one double-curvature region.
  • the combustion surface comprises a first portion formed by a perforated metal sheet, and a second portion formed by a permeable fibre- or thread-based material.
  • US2014011143A discloses a gas boiler burner comprising a diffuser, suitable for diffusing premixed fuel gases in a combustion chamber.
  • the diffuser comprises a diffuser central portion and two diffuser longitudinally peripheral portions.
  • the two diffuser longitudinally peripheral portions are connected together through the central diffuser portion.
  • the central diffuser portion extends longitudinally in a direction perpendicular to the flow of the fuel gases over a length I greater than zero and has transversal cross-sections shaped as a circumference arc having a uniform radius of curvature r.
  • Each of the diffuser longitudinally peripheral portions are shaped as a portion of a sphere having radius r.
  • US2016040905A discloses a burner assembly comprising a diffuser plate and a plurality of burners.
  • the burners are preferably defined in a unitary mesh structure, for example being stamped or pressed into mesh structure.
  • the first aspect of the invention is a premix gas burner according to claim 1.
  • the woven wire mesh burner deck of surface stabilized premix gas burners warms up when the burner is in use.
  • the woven wire mesh burner deck needs to be able to cope with the stresses induced by the thermal expansion associated with the high temperature when the burner is in use and by the shrinkage when the burner is not in use. If this is not the case, early mechanical failure of the burner deck will occur. Thanks to the provision of the tab or tabs at the circumference of the woven wire mesh burner - tab or tabs which are inserted through openings in the metal plate structure - an amount of movement of the woven wire mesh relative to the metal plate structure is possible when the woven wire mesh expands when warming up or shrinks when cooling down.
  • the premix gas burner of the invention has shown to be very well suited to withstand thermal expansion and shrinkage, resulting in a long lifetime of the premix gas burner.
  • Preferred tabs have a substantially rectangular shape.
  • Preferred tabs have a width between 4 and 20 mm; more preferred between 6 and 12 mm.
  • Preferred tabs have a height between 1 to 12 mm; more preferably between 3 and 6 mm.
  • Preferred tabs have a largest width between 4 and 20 mm; more preferably between 6 and 12 mm. Preferred tabs have a largest height between 3 and 6 mm.
  • the woven wire mesh has a thickness between 0.6 and 1.3 mm.
  • a woven wire mesh of 0.9 mm thickness can be advantageously used in the invention.
  • At least one tab is bent such that an included angle less than 180° is provided between the tab inserted through the opening and the section of the woven wire mesh at the other side of the opening.
  • all tabs are bent such that an included angle less than 180° is provided between the tab through the opening and the section of the woven wire mesh at the other side of the opening.
  • the included angle is less than 150°, even more preferably less than 120°.
  • the included angle is more than 30°, even more preferably more than 60°, even more preferably more than 90°.
  • Embodiments wherein at least one tab is bent ensure that the woven wire mesh is better held in place in applications where the burner is used with the burner deck facing downwards; and contribute to the realization of a longer lifetime of the burner deck and the burner.
  • the burner deck is provided in a convex shape. It is meant that when the burner is in operation, the flames of the burner are anchored onto the convex side of the burner deck. More preferably, the full surface of the burner deck is provided in a convex shape; meant is that when the burner is in operation, the full surface of the burner deck at the side of which the flames are anchored has a convex shape.
  • the woven wire mesh does not comprise ribs nor embossments.
  • the woven wire mesh comprises ribs and/or embossments.
  • tabs are only provided along the two long sides of the rectangular shape of the circumference of the burner deck. Meant is that no tabs are provided along the - possibly continuously - rounded short sides. Burners according to this embodiment are even better suited for long lifetime use, as the absence of tabs along the short sides allows better thermal expansion of the woven wire mesh in its length direction.
  • the metal plate structure comprises a groove.
  • the width of the groove is larger than the thickness of the woven wire mesh.
  • At least part of the - and preferably the complete - circumferential edge of the woven wire mesh is positioned in the groove.
  • Such embodiments synergistically add to provide a burner with a long life time.
  • the width of the groove is wider than the thickness of the woven wire mesh, a certain amount of movement of the woven wire mesh relative to the metal plate structure is provided.
  • such embodiments have an additional benefit, in that less risk of flame flashback via the edges of the woven wire mesh exists.
  • the depth of the groove is at least 1 mm, more preferably at least 2 mm.
  • the width of the groove is at least 0.1 mm larger than the thickness of the woven wire mesh. More preferably the width of the groove is at least 0.3 mm larger than the thickness of the woven wire mesh. Preferably, the width of the groove is less than 0.8 mm larger than the thickness of the woven wire mesh.
  • the depth of the groove is a least three times the difference between the width of the groove and the thickness of the woven wire mesh.
  • Such embodiments provide burners that have a long lifetime; as such burners are even better suited to cope with the thermal stresses on the woven wire mesh burner deck in use of the burner.
  • the metal plate structure comprises a groove and wherein the circumference of the burner deck has the shape of a rectangle but with the two short sides - preferably continuously - rounded; preferably the width of the groove is larger in the two - preferably continuously - rounded short sides than along the two long sides of the rectangular shape of the circumference of the burner deck.
  • Burners according to this embodiment are even better suited for long lifetime use, as the absence of tabs along the short sides in combination with the wider groove at the short side allows better thermal expansion of the woven wire mesh in length direction.
  • the metal structure comprises a groove
  • a number of slits are provided in the plate structure at the bottom of the groove.
  • the circumferential edge of the woven wire mesh comprises a number of tabs spread along the complete circumferential edge of the woven wire mesh; and each tab is inserted through a slit.
  • Preferred premix gas burners comprise a perforated plate segments through which the premix gas flows before the premix gas flows through the woven wire mesh.
  • the perforated plate segment is provided to distribute the premix gas more evenly over the surface of the burner deck; and therefore, contributes to the prolonged lifetime of the burner. More preferably, all zones of the perforated plate segment provided with perforations are provided at a distance of at least 1 mm from the woven wire mesh; and preferably at a distance of less than 3 mm. Such embodiments contribute to the ability to produce burners that have a long lifetime.
  • the metal plate structure comprises a first metal plate for mounting the burner in a heating appliance and a second metal plate comprising the perforated plate segment.
  • the metal plate structure comprises a groove, preferably one side of the groove is provided by the first metal plate; and the other side of the groove is provided by the second metal plate.
  • the metal plate structure comprises a metal plate.
  • the metal plate comprises sections for mounting the burner in a heating appliance as well as the perforated plate segment.
  • the metal plate structure comprises a groove, preferably the groove is provided by shaping the metal plate; e.g. by means of deep drawing of the metal plate.
  • a condensing boiler comprising a premix gas burner as in any embodiment of the first aspect of the invention.
  • the condensing boiler comprises a cast aluminium heat exchanger.
  • Figures 1 and 2 show a premix gas burner according to the first aspect of the invention.
  • Figure 1 shows the burner at the side of the burner deck where the combustion occurs, whereas figure 2 shows the burner from the side from which premix gas is supplied.
  • the premix gas burner comprises a metal plate structure 105 for mounting the premix gas burner in a heating appliance, a burner deck 110 and a groove 115 (not visible in figure 1 , the groove can be observed from its bottom in figure 2 ) in the metal plate structure 105.
  • the burner deck 110 consists out of a woven wire mesh on the outer surface of which premix gas is combusted after the premix gas has flown through the woven wire mesh.
  • the burner deck is provided in a convex shape over the full surface of the burner deck.
  • the woven wire mesh does not comprise ribs or embossments.
  • the circumference of the burner deck of the exemplary burner has the shape of a rectangle of which the two short sides have been continuously rounded; other circumferential shapes of the burner deck are possible however.
  • the width of the groove 115 is larger than the thickness of the woven wire mesh.
  • a number of openings 120 are provided in the bottom of the groove 115.
  • the openings can e.g. take the form of slits at the bottom of the groove.
  • the circumferential edge of the woven wire mesh is positioned in the groove 115.
  • the circumferential edge of the woven wire mesh comprises a number of tabs 125; each tab is inserted through an opening in the bottom of the groove.
  • tabs are only provided along the two long sides of the rectangular shape of the circumference of the burner deck.
  • the width of the groove is larger in the two continuously rounded short sides than along the two long sides of the rectangular shape of the circumference of the burner deck.
  • the tabs are bent (not shown in figure 2 , but is illustrated in figure 6 ) with respect to the surface of the burner deck, such that the woven wire mesh is better held in the premix gas burner.
  • the exemplary burner comprises a perforated plate 130 through which the premix gas flows before the premix gas flows through the woven wire mesh.
  • Figures 3 , 4 and 5 show cross sections of three different executions of burners according to the first aspect of the invention.
  • Figure 3 shows a cross section 300 according to plane A1-A1 of figure 1 of the exemplary burner shown in figures 1 and 2 .
  • the metal plate structure 305 comprises a metal plate comprising sections 307 for mounting the burner in a heating appliance as well as the perforated plate segment 330.
  • the metal plate structure (one metal plate) 305 is shaped by punching and deep drawing.
  • the metal plate 305 comprises a groove 315, with openings 320.
  • the circumferential edge of the woven wire mesh 310 is positioned in the groove 315.
  • the tabs 325 at the circumferential edge of the woven wire mesh 310 are inserted through openings 320 in the bottom of the groove 315 (the cross section shown in figure 3 crosses through tabs at both sides of the burner).
  • all zones of the perforated plate segment 330 provided with perforations are provided at a distance of at least 1 mm from the woven wire mesh 310; and preferably at a distance of less than 3 mm.
  • the depth D of the groove is 2 mm and the width W of the groove 1.5 and the thickness of the woven wire mesh is 0.9 mm.
  • the tabs are bent (not shown in figure 3 ) - more preferably to the inside of the burner - such that an included angle less than 180° - and preferably less than 150° - is created between the tab inserted through the opening and the section of the woven wire mesh at the other side of the opening.
  • FIG. 4 shows a cross section 400 of a burner according to an alternative embodiment of the invention.
  • the metal plate structure 405 comprises a metal plate.
  • the metal plate comprises sections 407 for mounting the burner in a heating appliance as well as the perforated plate segment 430. Premix gas flows through the perforations of the perforated plate segment 430 before the premix flows through the woven wire mesh burner deck 410 to be combusted at the other side of the woven wire mesh burner deck 410.
  • the metal plate structure (one metal plate) 405 is shaped by punching and deep drawing.
  • the metal plate 405 comprises openings 420, but no groove.
  • the tabs 425 at the circumferential edge of the woven wire mesh 410 are inserted through the openings (the cross section shown in figure 4 crosses through tabs at both sides of the burner).
  • all zones of the perforated plate segment 430 provided with perforations are provided at a distance of at least 1 mm from the woven wire mesh 410; and preferably at a distance of less than 3 mm.
  • the tabs are bent (not shown in figure 4 ) - more preferably to the inside of the burner - such that an included angle less than 180° - and preferably less than 150° - is created between the tab inserted through the opening and the section of the woven wire mesh at the other side of the opening.
  • FIG. 5 shows a cross section 500 of a burner according to an alternative embodiment of the invention.
  • the metal plate structure 505 comprises a first metal plate 507 for mounting the burner in a heating appliance and a second metal plate 530 comprising the perforated plate segment. Premix gas flows through the perforated plate segment before the premix gas flows through the woven wire mesh burner deck 510 to be combusted at the other side of the woven wire mesh burner deck 510.
  • a groove 515 is provided in the metal plate structure 505.
  • One side of the groove 515 is provided by the first metal plate 507; and the other side of the groove is provided by the second metal plate 510.
  • the circumferential edge of the woven wire mesh 510 is positioned in the groove 515.
  • the tabs 525 at the circumferential edge of the woven wire mesh 510 are inserted through openings 520 in the bottom of the groove 515 (the cross section shown in figure 5 crosses through tabs at both sides of the burner).
  • the depth of the groove is 2 mm and the width of the groove 1.5 mm and the thickness of the woven wire mesh is 0.9 mm.
  • the tabs are bent (not shown in figure 5 ) - more preferably to the inside of the burner - such that an included angle less than 180° - and preferably less than 150° - is created between the tab inserted through the opening and the section of the woven wire mesh at the other side of the opening.
  • Figure 6 illustrates the included angle between the tab inserted through the opening and the section of the woven wire mesh at the other side of the opening.
  • Figure 6 shows part of an inventive burner.
  • Figure 6 shows part of the metal plate structure 605 for mounting the burner, part of the perforated metal plate 630, the groove 615, part of the woven wire mesh 610 and a tab 625 inserted through an opening in the bottom of the groove.
  • Figure 6 illustrates how the tab is preferably bent such that an included angle alpha ( ⁇ ) is created between the tab 615 inserted through the opening and the section of the woven wire mesh 610 at the other side of the opening.
  • the included angle is less than 150°.
  • the tab is bent to the inside of the burner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Claims (14)

  1. Brûleur à gaz de prémélange, comprenant :
    - une structure de plaque métallique (105) permettant de monter le brûleur à gaz de prémélange dans un appareil de chauffage ; et
    - une partie supérieure (110) de brûleur, dans lequel la partie supérieure de brûleur comprend une toile située sur la surface extérieure de laquelle un gaz de prémélange fait l'objet d'une combustion après l'écoulement du gaz de prémélange à travers la toile ; dans lequel une ou plusieurs ouvertures (120) sont ménagées dans la structure de plaque métallique ;
    dans lequel la toile comprend un bord circonférentiel ;
    caractérisé en ce que le bord circonférentiel de la toile comprend au moins une patte (125) ;
    dans lequel chaque dite patte est introduite à travers une ouverture ménagée dans la structure de plaque métallique.
  2. Brûleur à gaz de prémélange selon la revendication 1, dans lequel au moins une patte ; et de préférence toutes les pattes ; est courbée de façon à former un angle inclus inférieur à 180° - et idéalement inférieur à 150°- entre la patte introduite à travers l'ouverture et la section de la toile au niveau de l'autre côté de l'ouverture.
  3. Brûleur à gaz de prémélange selon l'une ou l'autre des revendications précédentes, dans lequel la partie supérieure de brûleur est réalisée avec une forme convexe ; de préférence, dans lequel la partie supérieure de brûleur est façonnée avec une forme convexe sur toute la surface de la partie supérieure de brûleur.
  4. Brûleur à gaz de prémélange selon l'une quelconque des revendications précédentes, dans lequel la circonférence de la partie supérieure de brûleur a la forme d'un rectangle dont les deux côtés courts ont été, de préférence, arrondis en continu.
  5. Brûleur à gaz de prémélange selon la revendication 4, dans lequel des pattes ne sont prévues que le long des deux côtés courts de la forme rectangulaire de la circonférence de la partie supérieure de brûleur.
  6. Brûleur à gaz de prémélange selon l'une quelconque des revendications précédentes,
    dans lequel la structure de plaque métallique comprend une rainure (115) ;
    dans lequel la largeur de la rainure est supérieure à l'épaisseur de la toile ;
    dans lequel au moins une partie du bord circonférentiel, et de préférence tout le rebord circonférentiel, de la toile est positionnée dans la rainure ; et
    dans lequel au moins certaines des ouvertures - et de préférence toutes les ouvertures - sont disposées dans la rainure.
  7. Brûleur à gaz de prémélange selon la revendication 6, dans lequel la largeur de la rainure fait au moins 0,1 mm de plus que l'épaisseur de la toile.
  8. Brûleur à gaz de prémélange selon l'une ou l'autre de la revendication 6 et de la revendication 7,
    dans lequel la circonférence de la partie supérieure de brûleur a la forme d'un rectangle mais dont les deux côtés courts sont arrondis ;
    et dans lequel la largeur de la rainure, dans les deux côtés courts arrondis, est supérieure à celle des deux côtés longs de la forme rectangulaire de la circonférence de la partie supérieure de brûleur.
  9. Brûleur à gaz de prémélange selon l'une quelconque des revendications précédentes, dans lequel le brûleur comprend un segment de plaque perforé (330) à travers lequel le gaz de prémélange s'écoule avant de s'écouler à travers la toile.
  10. Brûleur à gaz de prémélange selon la revendication 9, dans lequel toutes les zones du segment de plaque perforé pourvues de perforations sont disposées à une distance d'au moins 1 mm de la toile, et de préférence à une distance inférieure à 3 mm de la toile.
  11. Brûleur à gaz de prémélange selon la revendication 9 ou la revendication10, dans lequel la structure de plaque métallique comprend une première plaque métallique permettant de monter le brûleur dans un appareil de chauffage, et une seconde plaque métallique comprenant le segment de plaque perforé.
  12. Brûleur à gaz de prémélange selon la revendication 11, et selon l'une quelconque des revendications 6 à 8, dans lequel un côté de la rainure est fourni par la première plaque métallique, et l'autre côté de la rainure est fourni par la seconde plaque métallique.
  13. Brûleur à gaz de prémélange selon la revendication 9 ou la revendication 10, dans lequel la structure de plaque métallique comprend une plaque métallique ; dans lequel la plaque métallique comprend des sections permettant de monter le brûleur dans un appareil de chauffage ainsi que le segment de plaque perforé.
  14. Brûleur à gaz de prémélange selon la revendication 13, et selon l'une quelconque des revendications 6 à 8, dans lequel la rainure est obtenue par un formage de la plaque métallique.
EP17761904.6A 2016-09-13 2017-09-11 Brûleur de gaz pré-mélangé Active EP3513123B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16188444 2016-09-13
PCT/EP2017/072684 WO2018050578A1 (fr) 2016-09-13 2017-09-11 Brûleur à gaz de prémélange

Publications (2)

Publication Number Publication Date
EP3513123A1 EP3513123A1 (fr) 2019-07-24
EP3513123B1 true EP3513123B1 (fr) 2021-02-17

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ID=56920603

Family Applications (2)

Application Number Title Priority Date Filing Date
EP17742700.2A Active EP3513122B1 (fr) 2016-09-13 2017-07-13 Brûleur de gaz pré-mélangé
EP17761904.6A Active EP3513123B1 (fr) 2016-09-13 2017-09-11 Brûleur de gaz pré-mélangé

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP17742700.2A Active EP3513122B1 (fr) 2016-09-13 2017-07-13 Brûleur de gaz pré-mélangé

Country Status (5)

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EP (2) EP3513122B1 (fr)
JP (2) JP2019526777A (fr)
KR (1) KR102368554B1 (fr)
CN (3) CN109716023B (fr)
WO (2) WO2018050310A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN110832253A (zh) * 2017-07-13 2020-02-21 贝卡尔特燃烧技术股份有限公司 预混合气体燃烧器
WO2019201599A1 (fr) 2018-04-19 2019-10-24 Bekaert Combustion Technology B.V. Brûleur à gaz de prémélange
CN112567176B (zh) * 2018-04-19 2023-03-07 贝卡尔特燃烧技术股份有限公司 预混气体燃烧器

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EP2789911B1 (fr) * 2013-04-09 2016-07-20 Bekaert Combustion Technology B.V. Brûleur de gaz pré-mélangé
EP3017099B1 (fr) * 2013-07-02 2019-05-22 Bekaert Combustion Technology B.V. Brûleur de gaz pré-mélangé
ITMI20131968A1 (it) 2013-11-26 2015-05-27 Worgas Bruciatori Srl Bruciatore
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Also Published As

Publication number Publication date
WO2018050310A1 (fr) 2018-03-22
CN109690190B (zh) 2020-09-22
EP3513122A1 (fr) 2019-07-24
KR20190045211A (ko) 2019-05-02
JP2019526777A (ja) 2019-09-19
KR102368554B1 (ko) 2022-03-02
WO2018050578A1 (fr) 2018-03-22
EP3513122B1 (fr) 2020-12-16
CN109716023B (zh) 2021-06-18
JP2019526776A (ja) 2019-09-19
CN112050208A (zh) 2020-12-08
CN109716023A (zh) 2019-05-03
CN109690190A (zh) 2019-04-26
EP3513123A1 (fr) 2019-07-24

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