WO2019201599A1 - Premix gas burner - Google Patents

Premix gas burner Download PDF

Info

Publication number
WO2019201599A1
WO2019201599A1 PCT/EP2019/058360 EP2019058360W WO2019201599A1 WO 2019201599 A1 WO2019201599 A1 WO 2019201599A1 EP 2019058360 W EP2019058360 W EP 2019058360W WO 2019201599 A1 WO2019201599 A1 WO 2019201599A1
Authority
WO
WIPO (PCT)
Prior art keywords
mounting plate
metal
metal mounting
wire mesh
plate structure
Prior art date
Application number
PCT/EP2019/058360
Other languages
French (fr)
Inventor
Geertjan KOOITJE
Mathieu VERHOOGT
Original Assignee
Bekaert Combustion Technology B.V.
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 Bekaert Combustion Technology B.V. filed Critical Bekaert Combustion Technology B.V.
Priority to EP19714669.9A priority Critical patent/EP3781865A1/en
Publication of WO2019201599A1 publication Critical patent/WO2019201599A1/en

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
    • F23D14/02—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
    • F23D14/12—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
    • F23D2213/00—Burner manufacture specifications
    • 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
    • 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
    • F23D2900/00019—Outlet manufactured from knitted fibres

Definitions

  • the invention relates to the field of premix gas burners, more specifically to the field of premix gas burners that have a woven wire mesh acting as burner deck.
  • WO2018/050310A1 discloses a premix gas burner comprising a metal mounting plate, a burner deck and a metal plate structure.
  • the metal mounting plate has a plain section for mounting the burner in a heating appliance.
  • the burner deck comprises a woven wire mesh onto which the flames are stabilized when the burner is in use. At least part of the metal plate structure is perforated for the premix gas to flow through the perforations before the premix gas flows through the woven wire mesh.
  • the metal mounting plate has an opening.
  • the woven wire mesh is inserted through the opening of the metal mounting plate.
  • the woven wire mesh is bent, such that a flange parallel with the plain section of the metal mounting plate is provided.
  • the flange is held between the metal mounting plate and the metal plate structure such that play is present of the flange relative to the metal mounting plate and relative to the metal plate structure.
  • the metal mounting plate is welded to the metal plate structure.
  • the first aspect of the invention is a premix gas burner comprising a metal mounting plate, a burner deck, a metal plate structure, and a gas mixing chamber.
  • the metal mounting plate comprises a plain section for mounting the burner in a heating appliance.
  • the burner deck comprises - and preferably consists out of - a woven wire mesh onto which the flames are stabilized when the burner is in use.
  • At least part of the metal plate structure is perforated for the premix gas to flow from the gas mixing chamber through the perforations of the metal plate structure before the premix gas flows through the woven wire mesh.
  • the metal mounting plate has an opening. The woven wire mesh is inserted from the gas mixing chamber through the opening of the metal mounting plate.
  • the metal plate structure is inserted from the gas mixing chamber through the opening of the metal mounting plate.
  • the woven wire mesh is bent such that a flange is provided along at least part of the circumference of the woven wire mesh.
  • the flange of the woven wire mesh is along the circumference of the porous burner deck split in a plurality of flange segments.
  • the opening of the metal mounting plate comprises two parallel linear sides.
  • the metal mounting plate comprises a plurality of lips at its inner circumference around the opening. The lips are folded over and grab into notches, slots or openings in the metal plate structure thereby clamping the metal plate structure firmly onto the metal mounting plate.
  • the metal mounting plate comprises upstanding ridges providing supporting elements onto which the metal plate structure is clamped by the lips of the metal mounting plate.
  • the upstanding ridges of the metal mounting plate fit into openings between segments of the flange of the woven wire mesh, such that the flange is held between the metal mounting plate and the metal plate structure with play of the flange relative to the metal mounting plate and relative to the metal plate structure.
  • the lips are provided on the upstanding ridges.
  • Such arrangement provides a more simple way of assembly of the burner.
  • the metal mounting plate is seamless and made from a single metal plate.
  • the metal plate structure is made from a single metal plate; more preferably the metal plate structure does not comprise welds. Even more preferably, the metal plate structure is seamless.
  • the lips are only provided along the two parallel linear sides of the
  • the flange of the woven wire mesh is provided parallel with the plain section of the metal mounting plate.
  • the metal mounting plate and the metal plate structure are not welded to each other. This way, thermal stress concentrations and thermally induced changes of material properties - e.g. reduced corrosion resistance - are prevented.
  • 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.
  • the metal plate structure is along at least 80% - and more preferably along at least 90%, even more preferably along 100% - of the length of each of the two parallel linear sides bent around the flange of the woven wire mesh such that the metal plate structure contacts the plain section of the metal mounting plate along a line or a plane.
  • Such embodiments have particular benefits.
  • the contact of the metal plate structure to the metal mounting plate along a line or a plane ensures that no premix gas can flow along the metal plate structure - instead of through the perforations of the metal plate structure - and around the metal wire mesh through the opening in the metal mounting plate.
  • Such flow - which is a leakage flow - of premix gas would be combusted on the metal wire mesh.
  • the embodiment effectively prevents such leakage flows, and therefore, provides a premix gas burner with more reliable ionization current measurement, especially at low burner load, and a higher life time expectance.
  • the line or plane contact between the metal plate structure and the plain section of the metal mounting plate along the two parallel linear sides is only interrupted at the notches, slots or openings in the metal plate structure through which the lips grab. More preferably, the line or plane contact between the metal plate structure and the plain section of the metal mounting plate is provided along the full length of the two parallel linear sides.
  • the opening of the metal mounting plate comprises a rectangular shape.
  • the two long sides of the rectangular shape are provided by the two parallel linear sides.
  • the short sides of the rectangular shape can be - preferably continuously - rounded.
  • the metal plate structure has a flange along the two short sides of the rectangular shape of the opening of the metal mounting plate.
  • the metal mounting plate has an upstanding ridge along the two short sides of the rectangular shape.
  • the flange of the metal plate structure along the two short sides of the rectangular shape contacts the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape. More preferably, the flange of the metal plate structure along the two short sides of the rectangular shape contacts the edge of the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape.
  • the porous burner deck is provided in a convex shape. More preferably, the porous burner deck is provided in a convex shape over the full surface of the porous burner deck provided for stabilizing the flames.
  • the porous burner deck has a double curved surface.
  • a surface is at a point on it double curved, there is at that point no direction in which the radius of curvature at that point is infinite.
  • a cylindrical burner is a burner that has a single curved surface, not a double curved surface.
  • the flange of the woven wire mesh is only provided along the long sides of the rectangular circumference of the woven wire mesh. Such embodiments provide burners with longer lifetime.
  • the flange is only provided to the woven wire mesh along the long sides of the rectangular circumference of the woven wire mesh: it is meant that the woven wire mesh does not comprise flanges along the two - preferably continuously - rounded short sides of the rectangular circumference of the woven wire mesh.
  • the bend angle providing the flange of the woven wire mesh is preferably at least 90°.
  • a second aspect of the invention is a heat cell comprising a heat exchanger and a premix gas burner as in the first aspect of the invention.
  • the heat exchanger comprises a combustion chamber.
  • the premix gas burner is provided in the combustion chamber for the generation of flue gas for heat transfer from the flue gas to a fluid flowing through the heat exchanger.
  • the heat exchanger is an aluminium heat exchanger, even more preferably a cast aluminium heat exchanger.
  • the heat cell can be used in a boiler; e.g. a boiler in a central heating installation.
  • Figure 1 shows a top view of a gas premix burner according to the invention.
  • Figure 2 shows a bottom view of the burner of figure 1.
  • Figure 3 shows a view on the burner along II - II of figure 2.
  • Figure 4 shows the woven wire mesh forming the porous burner deck of the burner of figure 1.
  • Figure 5 shows the metal mounting plate of the burner of figure 1 before assembly in the burner.
  • Figure 6 shows the metal plate structure as included in the burner of figure 1.
  • Figure 7 shows a view on the burner along VII-VII of figure 2.
  • Figures 1 - 7 show in combination an example of a gas premix burner according to the invention.
  • Figure 1 shows a top view 100 of a gas premix burner according to the invention.
  • Figure 2 shows a bottom view 200 of the burner of figure 1.
  • Figure 3 shows a view on the burner along II - II of figure 2.
  • Figure 4 shows the woven wire mesh forming the porous burner deck of the burner of figure 1.
  • Figure 5 shows the metal mounting plate 102 of the burner of figure 1 before its assembly in the burner.
  • Figure 6 shows the metal plate structure 106 as included in the burner of figure 1.
  • Figure 3 shows a view on the burner along VII - VII of figure 2.
  • the premix gas burner comprises a metal mounting plate 102, a woven wire mesh 110 providing the burner deck, a metal plate structure 106 and a gas mixing chamber 108.
  • the metal mounting plate comprises a plain section 107 for mounting the burner in a heating appliance.
  • the burner deck consists out of a woven wire mesh onto which the flames are stabilized when the burner is in use.
  • the porous burner deck is provided in a convex shape over its full surface.
  • the circumference of the woven wire mesh has the shape of a rectangle of which the two short sides have been continuously rounded.
  • the metal plate structure 106 comprises a plurality of perforations 1 12 for flow of premix gas from the gas mixing chamber 108 through the perforations of the metal plate structure before the premix gas flows through the porous burner deck.
  • the woven wire mesh is inserted from the gas mixing chamber through the opening 1 1 1 of the metal mounting plate.
  • the opening 1 1 1 in the metal mounting plate has a rectangular shape, of which the two long sides of the rectangular shape are provided by the two parallel linear sides. The short sides of the rectangular shape are continuously rounded.
  • the metal plate structure is inserted from the gas mixing chamber through the opening of the metal mounting plate. The metal mounting plate and the metal plate structure are not welded to each other.
  • the woven wire mesh 1 10 is bent such that a flange 122 is provided along the long sides of the rectangular circumference of the woven wire mesh.
  • the flange is split in a number of flange segments. Openings 124 are provided between flange segments.
  • the flange of the woven wire mesh is provided parallel with the plain section 107 of the metal mounting plate.
  • the opening of the metal mounting plate comprises two parallel linear sides.
  • the metal mounting plate comprises a plurality of lips 1 16 at its inner circumference around the opening 1 1 1. Lips are only provided along the two parallel linear sides of the
  • the metal plate structure comprises a plurality of openings 1 18 and a flange 120 at the circumference of the metal plate structure.
  • the lips 1 16 of the metal mounting plate are folded over and grab into the openings 1 18 in the metal plate structure thereby clamping the metal plate structure firmly onto the metal mounting plate.
  • Figure 5 shows the metal mounting plate, with the lips 1 16, before assembly in the burner. The lips 1 16 are folded towards the inside of the burner during assembly of the burner.
  • the metal mounting plate comprises upstanding ridges 126 providing supporting
  • the lips 1 16 are provided on the upstanding ridges 126.
  • the lips 1 16 clamp the flange segments of the metal plate structure onto the upstanding ridges 126; this way the metal plate structure is firmly clamped onto the metal mounting plate.
  • the arrangement is such that only clamping (only lips folded over to act as clamps) is provided along the long sides of the rectangular cross section of the opening of the metal mounting plate. Such arrangement facilitates the manufacturing operation.
  • the upstanding ridges 126 of the metal mounting plate fit into the openings 124 between segments of the flange of the woven wire mesh.
  • the height of the upstanding ridges 126 determines the space between the metal mounting plate and the metal plate structure.
  • This distance is selected to be larger than the thickness of the woven wire mesh burner deck, such that the flange segments are present between the metal mounting plate and the metal plate structure such that play is present between the flange segments on the one hand; and the metal mounting plate and the plate structure on the other hand.
  • the flange of the woven wire mesh is held between the metal mounting plate and the metal plate structure such that play is present of the flange relative to the metal mounting plate and relative to the metal plate structure. Consequently, the woven wire mesh burner deck can efficiently cope with thermal expansion and contraction.
  • the metal plate structure is bent around the flange of the woven wire mesh such that the metal plate structure contacts the plain section of the metal mounting plate along a line 138.
  • the metal plate structure has a flange along the two continuously rounded short.
  • the metal mounting plate has an upstanding ridge 142 along the two continuously rounded short sides of the rectangular shape of the opening in the metal mounting plate.
  • the flange of the metal plate structure 120 contacts the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape.

Landscapes

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

Abstract

A premix gas burner comprises a metal mounting plate (102), a burner deck, a metal plate structure (106), and a gas mixing chamber (108). The metal mounting plate comprises a plain section (107) for mounting the burner in a heating appliance. The burner deck comprises a woven wire mesh (110) onto which the flames are stabilized when the burner is in use. At least part of the metal plate structure is perforated for the premix gas to flow from the gas mixing chamber through the perforations (112) of the metal plate structure before the premix gas flows through the woven wire mesh. The metal mounting plate has an opening (111). The woven wire mesh is inserted from the gas mixing chamber through the opening of the metal mounting plate. The metal plate structure is inserted from the gas mixing chamber through the opening of the metal mounting plate. The woven wire mesh is bent such that a flange (122) is provided along at least part of the circumference of the woven wire mesh. The flange of the woven wire mesh is along the circumference of the porous burner deck split in a plurality of flange segments. The opening of the metal mounting plate comprises two parallel linear sides. The metal mounting plate comprises a plurality of lips (116) at its inner circumference around the opening. The lips are folded over and grab into notches, slots or openings in the metal plate structure thereby clamping the metal plate structure firmly onto the metal mounting plate. The metal mounting plate comprises upstanding ridges (126) providing supporting elements onto which the metal plate structure is clamped by the lips of the metal mounting plate. The upstanding ridges of the metal mounting plate fit into openings between segments of the flange of the woven wire mesh, such that the flange is held between the metal mounting plate and the metal plate structure with play of the flange relative to the metal mounting plate and relative to the metal plate structure.

Description

Premix gas burner
Description
Technical Field
[1] The invention relates to the field of premix gas burners, more specifically to the field of premix gas burners that have a woven wire mesh acting as burner deck.
Background Art
[2] WO2018/050310A1 discloses a premix gas burner comprising a metal mounting plate, a burner deck and a metal plate structure. The metal mounting plate has a plain section for mounting the burner in a heating appliance. The burner deck comprises a woven wire mesh onto which the flames are stabilized when the burner is in use. At least part of the metal plate structure is perforated for the premix gas to flow through the perforations before the premix gas flows through the woven wire mesh. The metal mounting plate has an opening. The woven wire mesh is inserted through the opening of the metal mounting plate. The woven wire mesh is bent, such that a flange parallel with the plain section of the metal mounting plate is provided. The flange is held between the metal mounting plate and the metal plate structure such that play is present of the flange relative to the metal mounting plate and relative to the metal plate structure. The metal mounting plate is welded to the metal plate structure.
Disclosure of Invention
[3] The first aspect of the invention is a premix gas burner comprising a metal mounting plate, a burner deck, a metal plate structure, and a gas mixing chamber. The metal mounting plate comprises a plain section for mounting the burner in a heating appliance. The burner deck comprises - and preferably consists out of - a woven wire mesh onto which the flames are stabilized when the burner is in use. At least part of the metal plate structure is perforated for the premix gas to flow from the gas mixing chamber through the perforations of the metal plate structure before the premix gas flows through the woven wire mesh. The metal mounting plate has an opening. The woven wire mesh is inserted from the gas mixing chamber through the opening of the metal mounting plate. The metal plate structure is inserted from the gas mixing chamber through the opening of the metal mounting plate. The woven wire mesh is bent such that a flange is provided along at least part of the circumference of the woven wire mesh. The flange of the woven wire mesh is along the circumference of the porous burner deck split in a plurality of flange segments. The opening of the metal mounting plate comprises two parallel linear sides. The metal mounting plate comprises a plurality of lips at its inner circumference around the opening. The lips are folded over and grab into notches, slots or openings in the metal plate structure thereby clamping the metal plate structure firmly onto the metal mounting plate. The metal mounting plate comprises upstanding ridges providing supporting elements onto which the metal plate structure is clamped by the lips of the metal mounting plate. The upstanding ridges of the metal mounting plate fit into openings between segments of the flange of the woven wire mesh, such that the flange is held between the metal mounting plate and the metal plate structure with play of the flange relative to the metal mounting plate and relative to the metal plate structure.
[4] It is a benefit of the burner of the invention that a burner with excellent performance can be assembled without performing a welding operation. Welding operations apply heat locally resulting in a local change of the properties of the material affected by the heat. The local change in material properties can involve reduced corrosion resistance or induce brittleness. Furthermore, the arrangement of the lips and the upstanding ridges - wherein the upstanding ridges fit in openings between the segments of the flange of the woven wire mesh - allows that only one arrangement of fixation is required to clamp the metal plate structure firmly to the metal mounting plate and at the same time to ensure that the woven wire mesh is held with play between the metal mounting plate and the metal plate structure. This arrangement facilitates and speeds up burner assembly.
[5] Preferably, the lips are provided on the upstanding ridges. Such arrangement provides a more simple way of assembly of the burner.
[6] Preferably, the metal mounting plate is seamless and made from a single metal plate.
[7] Preferably, the metal plate structure is made from a single metal plate; more preferably the metal plate structure does not comprise welds. Even more preferably, the metal plate structure is seamless.
[8] Preferably, the lips are only provided along the two parallel linear sides of the
circumference of the opening of the metal mounting plate. It is a benefit of such embodiments that a burner with a longer lifetime is obtained. When the burner is in use, the metal plate structure heats up more than the metal mounting plate. When lips would be provided along the two shorter sides of the circumference of the opening, the connections of the metal plate structure to the metal mounting plate made with the lips along the shorter sides of the circumference of the opening would be stressed much more, which could lead to failure of these connections over time.
[9] Preferably, the flange of the woven wire mesh is provided parallel with the plain section of the metal mounting plate.
[10] Preferably, the metal mounting plate and the metal plate structure are not welded to each other. This way, thermal stress concentrations and thermally induced changes of material properties - e.g. reduced corrosion resistance - are prevented.
[1 1] Preferably, the woven wire mesh has a thickness between 0.6 and 1 .3 mm. As an
example, a woven wire mesh of 0.9 mm thickness can be advantageously used in the invention.
[12] Preferably, the metal plate structure is along at least 80% - and more preferably along at least 90%, even more preferably along 100% - of the length of each of the two parallel linear sides bent around the flange of the woven wire mesh such that the metal plate structure contacts the plain section of the metal mounting plate along a line or a plane. Such embodiments have particular benefits. The contact of the metal plate structure to the metal mounting plate along a line or a plane ensures that no premix gas can flow along the metal plate structure - instead of through the perforations of the metal plate structure - and around the metal wire mesh through the opening in the metal mounting plate. Such flow - which is a leakage flow - of premix gas would be combusted on the metal wire mesh. However, this leakage flow would affect the distribution of flames on the woven wire mesh burner deck and could cause a number of unwanted effects, e.g. a deviation on the measurement of the ionization current or an abnormal surface temperature distribution. The consequence would be an incorrect measurement of the ionization current - especially at low load - which is used in gas adaptive burner control, or a reduced life expectation. The embodiment effectively prevents such leakage flows, and therefore, provides a premix gas burner with more reliable ionization current measurement, especially at low burner load, and a higher life time expectance. More preferably, the line or plane contact between the metal plate structure and the plain section of the metal mounting plate along the two parallel linear sides is only interrupted at the notches, slots or openings in the metal plate structure through which the lips grab. More preferably, the line or plane contact between the metal plate structure and the plain section of the metal mounting plate is provided along the full length of the two parallel linear sides.
[13] Preferably, the opening of the metal mounting plate comprises a rectangular shape. The two long sides of the rectangular shape are provided by the two parallel linear sides. The short sides of the rectangular shape can be - preferably continuously - rounded.
[14] In a preferred embodiment, the metal plate structure has a flange along the two short sides of the rectangular shape of the opening of the metal mounting plate. The metal mounting plate has an upstanding ridge along the two short sides of the rectangular shape. The flange of the metal plate structure along the two short sides of the rectangular shape contacts the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape. More preferably, the flange of the metal plate structure along the two short sides of the rectangular shape contacts the edge of the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape.
[15] Preferably, the porous burner deck is provided in a convex shape. More preferably, the porous burner deck is provided in a convex shape over the full surface of the porous burner deck provided for stabilizing the flames.
[16] Preferably, the porous burner deck has a double curved surface. Where a surface is at a point on it double curved, there is at that point no direction in which the radius of curvature at that point is infinite. As an example, a cylindrical burner is a burner that has a single curved surface, not a double curved surface.
[17] Preferably, the flange of the woven wire mesh is only provided along the long sides of the rectangular circumference of the woven wire mesh. Such embodiments provide burners with longer lifetime. [18] Preferably, the flange is only provided to the woven wire mesh along the long sides of the rectangular circumference of the woven wire mesh: it is meant that the woven wire mesh does not comprise flanges along the two - preferably continuously - rounded short sides of the rectangular circumference of the woven wire mesh. The bend angle providing the flange of the woven wire mesh is preferably at least 90°.
[19] A second aspect of the invention is a heat cell comprising a heat exchanger and a premix gas burner as in the first aspect of the invention. The heat exchanger comprises a combustion chamber. The premix gas burner is provided in the combustion chamber for the generation of flue gas for heat transfer from the flue gas to a fluid flowing through the heat exchanger. Preferably, the heat exchanger is an aluminium heat exchanger, even more preferably a cast aluminium heat exchanger. The heat cell can be used in a boiler; e.g. a boiler in a central heating installation.
Brief Description of the Drawings
[20] Figure 1 shows a top view of a gas premix burner according to the invention.
Figure 2 shows a bottom view of the burner of figure 1.
Figure 3 shows a view on the burner along II - II of figure 2.
Figure 4 shows the woven wire mesh forming the porous burner deck of the burner of figure 1.
Figure 5 shows the metal mounting plate of the burner of figure 1 before assembly in the burner.
Figure 6 shows the metal plate structure as included in the burner of figure 1.
Figure 7 shows a view on the burner along VII-VII of figure 2.
Modes for Carrying Out the Invention
[21] Figures 1 - 7 show in combination an example of a gas premix burner according to the invention. Figure 1 shows a top view 100 of a gas premix burner according to the invention. Figure 2 shows a bottom view 200 of the burner of figure 1. Figure 3 shows a view on the burner along II - II of figure 2. Figure 4 shows the woven wire mesh forming the porous burner deck of the burner of figure 1. Figure 5 shows the metal mounting plate 102 of the burner of figure 1 before its assembly in the burner. Figure 6 shows the metal plate structure 106 as included in the burner of figure 1. Figure 3 shows a view on the burner along VII - VII of figure 2.
[22] The premix gas burner comprises a metal mounting plate 102, a woven wire mesh 110 providing the burner deck, a metal plate structure 106 and a gas mixing chamber 108. The metal mounting plate comprises a plain section 107 for mounting the burner in a heating appliance. The burner deck consists out of a woven wire mesh onto which the flames are stabilized when the burner is in use. The porous burner deck is provided in a convex shape over its full surface. The circumference of the woven wire mesh has the shape of a rectangle of which the two short sides have been continuously rounded. [23] The metal plate structure 106 comprises a plurality of perforations 1 12 for flow of premix gas from the gas mixing chamber 108 through the perforations of the metal plate structure before the premix gas flows through the porous burner deck.
[24] The woven wire mesh is inserted from the gas mixing chamber through the opening 1 1 1 of the metal mounting plate. The opening 1 1 1 in the metal mounting plate has a rectangular shape, of which the two long sides of the rectangular shape are provided by the two parallel linear sides. The short sides of the rectangular shape are continuously rounded. The metal plate structure is inserted from the gas mixing chamber through the opening of the metal mounting plate. The metal mounting plate and the metal plate structure are not welded to each other.
[25] The woven wire mesh 1 10 is bent such that a flange 122 is provided along the long sides of the rectangular circumference of the woven wire mesh. The flange is split in a number of flange segments. Openings 124 are provided between flange segments. The flange of the woven wire mesh is provided parallel with the plain section 107 of the metal mounting plate.
[26] The opening of the metal mounting plate comprises two parallel linear sides. The metal mounting plate comprises a plurality of lips 1 16 at its inner circumference around the opening 1 1 1. Lips are only provided along the two parallel linear sides of the
circumference of the opening, not along the continuously rounded shorter sides of the circumference of the opening. The metal plate structure comprises a plurality of openings 1 18 and a flange 120 at the circumference of the metal plate structure. The lips 1 16 of the metal mounting plate are folded over and grab into the openings 1 18 in the metal plate structure thereby clamping the metal plate structure firmly onto the metal mounting plate. Figure 5 shows the metal mounting plate, with the lips 1 16, before assembly in the burner. The lips 1 16 are folded towards the inside of the burner during assembly of the burner.
[27] The metal mounting plate comprises upstanding ridges 126 providing supporting
elements onto which the metal plate structure is clamped by the lips of the metal mounting plate. The lips 1 16 are provided on the upstanding ridges 126. The lips 1 16 clamp the flange segments of the metal plate structure onto the upstanding ridges 126; this way the metal plate structure is firmly clamped onto the metal mounting plate. The arrangement is such that only clamping (only lips folded over to act as clamps) is provided along the long sides of the rectangular cross section of the opening of the metal mounting plate. Such arrangement facilitates the manufacturing operation. The upstanding ridges 126 of the metal mounting plate fit into the openings 124 between segments of the flange of the woven wire mesh. The height of the upstanding ridges 126 determines the space between the metal mounting plate and the metal plate structure. This distance is selected to be larger than the thickness of the woven wire mesh burner deck, such that the flange segments are present between the metal mounting plate and the metal plate structure such that play is present between the flange segments on the one hand; and the metal mounting plate and the plate structure on the other hand. This way, the flange of the woven wire mesh is held between the metal mounting plate and the metal plate structure such that play is present of the flange relative to the metal mounting plate and relative to the metal plate structure. Consequently, the woven wire mesh burner deck can efficiently cope with thermal expansion and contraction.
[28] Along the length of each of the two parallel linear sides the metal plate structure is bent around the flange of the woven wire mesh such that the metal plate structure contacts the plain section of the metal mounting plate along a line 138.
[29] The metal plate structure has a flange along the two continuously rounded short. The metal mounting plate has an upstanding ridge 142 along the two continuously rounded short sides of the rectangular shape of the opening in the metal mounting plate. The flange of the metal plate structure 120 contacts the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape.

Claims

Claims
1. Premix gas burner; comprising
- a metal mounting plate (102);
- a burner deck;
- a metal plate structure (106); and
- a gas mixing chamber (108);
wherein the metal mounting plate comprises a plain section (107) for mounting the burner in a heating appliance;
wherein the burner deck comprises a woven wire mesh (110) onto which the flames are stabilized when the burner is in use;
wherein at least part of the metal plate structure is perforated for the premix gas to flow from the gas mixing chamber through the perforations (112) of the metal plate structure before the premix gas flows through the woven wire mesh;
wherein the metal mounting plate has an opening (111 );
wherein the woven wire mesh is inserted from the gas mixing chamber through the opening of the metal mounting plate;
wherein the metal plate structure is inserted from the gas mixing chamber through the opening of the metal mounting plate;
wherein the woven wire mesh is bent such that a flange (122) is provided along at least part of the circumference of the woven wire mesh; wherein the flange of the woven wire mesh is along the circumference of the porous burner deck split in a plurality of flange segments;
wherein the opening of the metal mounting plate comprises two parallel linear sides;
characterized in that the metal mounting plate comprises a plurality of lips (116) at its inner circumference around the opening;
wherein the lips are folded over and grab into notches, slots or openings in the metal plate structure thereby clamping the metal plate structure firmly onto the metal mounting plate; wherein the metal mounting plate comprises upstanding ridges (126) providing supporting elements onto which the metal plate structure is clamped by the lips of the metal mounting plate;
wherein the upstanding ridges of the metal mounting plate fit into openings (124) between segments of the flange of the woven wire mesh, such that the flange is held between the metal mounting plate and the metal plate structure with play of the flange relative to the metal mounting plate and relative to the metal plate structure.
2. Premix gas burner as in claim 1 , wherein the lips (116) are provided on the upstanding ridges (126).
3. Premix gas burner as in any of the preceding claims, wherein the lips (116) are only provided along the two parallel linear sides of the circumference of the opening of the metal mounting plate.
4. Premix gas burner as in any of the preceding claims, wherein the flange (122) of the woven wire mesh is provided parallel with the plain section of the metal mounting plate.
5. Premix gas burner as in any of the preceding claims, wherein the metal mounting plate and the metal plate structure are not welded to each other.
6. Premix gas burner as in any of the preceding claims;
wherein along at least 80% - and preferably along 100% - of the length of each of the two parallel linear sides, the metal plate structure is bent around the flange of the woven wire mesh such that the metal plate structure contacts the plain section of the metal mounting plate along a line or a plane.
7. Premix gas burner as in any of the preceding claims, wherein the opening of the metal
mounting plate comprises a rectangular shape, wherein the two long sides of the rectangular shape are provided by the two parallel linear sides; and possibly wherein the short sides of the rectangular shape are - preferably continuously - rounded.
8. Premix gas burner as in claim 7,
wherein the metal plate structure has a flange along the two short sides of the rectangular shape;
wherein the metal mounting plate has an upstanding ridge along the two short sides of the rectangular shape; and
wherein the flange of the metal plate structure along the two short sides of the rectangular shape contacts the upstanding ridge of the metal mounting plate along the two short sides of the rectangular shape.
9. Premix gas burner as in any of the preceding claims, wherein the porous burner deck is
provided in a convex shape.
10. Premix gas burner as in any of the preceding claims, wherein the flange of the woven wire mesh is only provided along the long sides of the rectangular circumference of the woven wire mesh.
11. Heat cell, comprising a heat exchanger and a premix gas burner as in any one of the previous claims,
wherein the heat exchanger comprises a combustion chamber;
wherein the premix gas burner is provided in the combustion chamber for the generation of flue gas for heat transfer from the flue gas to a fluid flowing through the heat exchanger.
PCT/EP2019/058360 2018-04-19 2019-04-03 Premix gas burner WO2019201599A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19714669.9A EP3781865A1 (en) 2018-04-19 2019-04-03 Premix gas burner

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP18168254 2018-04-19
EP18168254.3 2018-04-19
EP18183284 2018-07-13
EP18183284.1 2018-07-13

Publications (1)

Publication Number Publication Date
WO2019201599A1 true WO2019201599A1 (en) 2019-10-24

Family

ID=65995763

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/058360 WO2019201599A1 (en) 2018-04-19 2019-04-03 Premix gas burner

Country Status (2)

Country Link
EP (1) EP3781865A1 (en)
WO (1) WO2019201599A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0915293A2 (en) * 1997-11-06 1999-05-12 Robert Bosch Gmbh Forced draught burner
WO2018050310A1 (en) 2016-09-13 2018-03-22 Bekaert Combustion Technology B.V. Premix gas burner
WO2019011736A1 (en) * 2017-07-13 2019-01-17 Bekaert Combustion Technology B.V. Premix gas burner
WO2019011738A1 (en) * 2017-07-13 2019-01-17 Bekaert Combustion Technology B.V. Premix gas burner

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0915293A2 (en) * 1997-11-06 1999-05-12 Robert Bosch Gmbh Forced draught burner
WO2018050310A1 (en) 2016-09-13 2018-03-22 Bekaert Combustion Technology B.V. Premix gas burner
WO2019011736A1 (en) * 2017-07-13 2019-01-17 Bekaert Combustion Technology B.V. Premix gas burner
WO2019011738A1 (en) * 2017-07-13 2019-01-17 Bekaert Combustion Technology B.V. Premix gas burner

Also Published As

Publication number Publication date
EP3781865A1 (en) 2021-02-24

Similar Documents

Publication Publication Date Title
US10352619B2 (en) Refractory anchor assembly and method for installing the same
RU2737576C1 (en) Boiler with fire tubes
CN109716023B (en) Premix gas burner
EP3781865A1 (en) Premix gas burner
EP2805111B1 (en) Cylindrical gas premix burner
US6374563B1 (en) Anchoring system for ceramic lining tile
US11320173B2 (en) Smoke tube boiler
US11326808B2 (en) Premix gas burner
WO2019011736A1 (en) Premix gas burner
WO2019011738A1 (en) Premix gas burner
US10823452B2 (en) Heat source machine
US20200200437A1 (en) Premix gas burner
EP3781866B1 (en) Premix gas burner
WO2019011737A1 (en) Premix gas burner
KR20170040534A (en) Laminated type plate heat exchanger
KR20100050771A (en) Pin-tube type heat exchanger having end plate equipped with tube supporting part
JP2019066117A (en) Heat exchanger and water heater
WO2024013046A1 (en) Premix gas burner and method for manufacturing a premix gas burner
WO2019057483A1 (en) Cylindrical premix gas burner in a heat exchanger
EP1256760B1 (en) Assembly of a burner and a burner housing
KR20140088673A (en) Radiant tube
WO2018061531A1 (en) Heat exchanger, radiant tube heating device, and method for manufacturing heat exchanger

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19714669

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2019714669

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2019714669

Country of ref document: EP

Effective date: 20201119