EP2815179A1 - Premix gas burner - Google Patents

Premix gas burner

Info

Publication number
EP2815179A1
EP2815179A1 EP13702067.3A EP13702067A EP2815179A1 EP 2815179 A1 EP2815179 A1 EP 2815179A1 EP 13702067 A EP13702067 A EP 13702067A EP 2815179 A1 EP2815179 A1 EP 2815179A1
Authority
EP
European Patent Office
Prior art keywords
cylindrical
premix gas
perforations
gas burner
burner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13702067.3A
Other languages
German (de)
French (fr)
Inventor
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.)
Filing date
Publication date
Application filed by Bekaert Combustion Technology BV filed Critical Bekaert Combustion Technology BV
Priority to EP13702067.3A priority Critical patent/EP2815179A1/en
Publication of EP2815179A1 publication Critical patent/EP2815179A1/en
Withdrawn legal-status Critical Current

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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/101—Flame diffusing means characterised by surface shape
    • F23D2203/1012—Flame diffusing means characterised by surface shape tubular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/102—Flame diffusing means using perforated 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
    • F23D2203/105—Porous plates
    • F23D2203/1055—Porous plates with a specific void range

Definitions

  • the invention relates to a cylindrical premix gas burner, and specifically to such burners with a perforated plate as cylindrical burner deck.
  • the cylindrical premix gas burner has an inlet disc for the entry of premix of air and combustible gas into the cylindrical premix gas burner.
  • Such burners find use in boilers and in instantaneous water heaters.
  • WO201 1/069839 and EP2037175A2 provide examples of such burners. These examples are provided without the use of a second cylindrical element in the burner that would act as distributor of premix gas inside the burner prior to the premix gas flowing through the cylindrical burner deck. The premix gas is burned at the outside of the cylindrical burner deck.
  • EP2037175A2 are provided with an inlet disc with a multiple of
  • the primary objective of the invention is to provide a cylindrical premix gas burner that results in lower emission values, especially of NOX (nitrogen oxides) than the cylindrical premix gas burners that are known in the art.
  • NOX nitrogen oxides
  • the invention discloses a cylindrical premix gas burner which is
  • the cylindrical burner deck is comprising a perforated metal plate.
  • the cylindrical burner deck is a perforated metal plate, without any other layer on either side of the perforated metal plate.
  • the cylindrical premix gas burner is delimited by an end cap. At the opposite side of the end cap, an inlet disc with perforations is provided for the supply of a premix of combustible gas and air into the burner. The premix gas will be burnt on the outside of the cylindrical burner deck after the premix gas has flown through it.
  • the inlet disc is comprising
  • the central zone is the zone on the inlet disc around the centre point of the inlet disc.
  • the centre point is where the central axis of the cylindrical premix gas burner crosses the inlet disc.
  • the porosity of the inlet disc is higher in the central zone than in the peripheral zone.
  • the average surface area of the perforations in the central zone of the inlet disc is less than 20 mm 2 , and preferably less than 13 mm 2 , and more preferably less than 10 mm 2 .
  • the cylindrical burner of the invention e.g. has an internal diameter of more than 50 mm.
  • the porosity in the central zone is between 25 and 50% of the surface area of the central zone, more preferably between 30 and 40%.
  • the porosity in the peripheral zone is 15 to 30%, more preferred between 17 and 25% of the surface area of the peripheral zone.
  • the average porosity of the inlet disc (calculated for the full inner diameter of the cylindrical premix gas burner) is between 20% and 50%, more preferably between 25% and 40%.
  • the cylindrical premix gas burner is devoid of a diffuser inside the cylindrical perforated burner deck. It means that premix gas is flowing through the inlet disc, and without no further physical obstacles it is flowing through the perforations of the cylindrical burner deck to be burnt on the outside of the cylindrical burner deck.
  • the section of the inlet disc that is covered by the cylindrical burner deck is flat, which makes that perforations in the inlet disc for the supply of premix gas are easy and cheap to produce.
  • the porosity of the inlet disc is higher in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner, compared to the porosity in a peripheral zone between 35% and 75% of the inner diameter of the cylindrical gas burner.
  • the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner is meant the zone within a circle around the centre point of the inlet disc that is having a diameter of 20% of the inner diameter of the cylindrical premix gas burner.
  • the preferred porosity in that central zone is between 25 and 50% of the surface area of that central zone, more preferably between 30 and 40%.
  • the porosity in that peripheral zone is 15 to 30%, more preferred between 17 and 25% of its surface area.
  • the central zone comprises at least seven perforations.
  • the inlet disc is not permeable to premix gas in the zone between 80% and 100% of the inner diameter of the cylindrical premix gas burner.
  • the circles with these diameters are considered around the centre point of the inlet disc.
  • the benefit of this embodiment is that further reduced NOX values are obtained in burners according to this embodiment.
  • central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner is in absolute terms at least 8 % higher (and preferably at least 10 %, more preferably at least 15 % higher) than the porosity of the inlet disc in the zone between 35% and 75% of the inner diameter of the cylindrical premix gas.
  • each of the perforations in the zone between 40% and 75% of the inner diameter of the cylindrical gas burner are of the same size.
  • each of the perforations in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner have a surface area of less than 20 mm 2 , and preferably less than 13 mm 2 and more preferably less than 10 mm 2 .
  • perforations in the central zone is between 1 .22 and 9 times, more preferably between 1 .22 and 2.5 times the average surface area of the perforations in the peripheral zone.
  • Preferred are circular perforations.
  • the perforations (for premix gas supply) in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner are all of the same shape and size.
  • the perforations in the inlet disc are all of the same size; and the density of the perforations in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner is on average higher (and preferably at least 10% in relative terms, more preferably at least 50 higher in relative terms) than the average density of the perforations in the zone between 20% and 75% of the inner diameter of the cylindrical premix gas burner.
  • the density of the perforations is meant the number of perforations relative to the surface area.
  • the average porosity of the cylindrical burner deck of less than 1 1 %.
  • the cylindrical burner deck can have circumferential zones of different porosity (of preferably at least 25% of the length of the perforated zone of the cylindrical metallic burner membrane), with an absolute difference in porosity of more than 3%.
  • circumferential zone is meant a cylindrical part of the cylindrical burner deck; and the porosity of the circumferential zone is the total perforated area of that zone relative to the total area of the circumferential zone.
  • the cylindrical burner deck has
  • a zone with perforations, the porosity of the zone is less than 10%, preferably between 7 and 8.5%.
  • the average porosity of the cylindrical burner deck is less than 1 1 %.
  • Burners according to such embodiments of the invention have shown to have even better results in NOX (lower NOX) thanks to the synergy between the features of the inlet disc and the features of the metallic burner membrane. Surprisingly, such burners showed to generate less noise, even than the burners of WO201 1/069839, due to the synergetic effect of the perforations in the inlet disk and the perforations in the burner deck.
  • the burner deck has a third section, further away from the inlet disc than the perforated section with porosity less than 10%, wherein the third section is having a porosity higher than 12%, preferably between 14 and 16%.
  • a burner according to these embodiment of the invention has shown to have even better results in NOX (lower NOX) thanks to the synergy between the features of the inlet disc and the features of the metallic burner membrane. Surprisingly, such burners showed to generate less noise, even than the burners of
  • the cylindrical premix gas burner according to the invention can be any cylindrical premix gas burner according to the invention.
  • Figure 1 shows an example of a cylindrical premix gas burner according to the invention.
  • FIG. 1 shows a section of an example of a cylindrical premix gas burner 100 according to the invention.
  • the burner 100 has a perforated plate that forms the cylindrical burner deck 1 10 (perforations in the cylindrical burner deck 1 10 are only partly shown in the figure), with inner diameter 69.2 mm.
  • the burner 100 is delimited by an end cap 1 15.
  • an inlet disc 120 is present, that can have a flange 125 with holes 127 for connection of the burner e.g. in a burner housing.
  • the inlet disc 120 can be connected to the cylindrical burner deck 1 10 by means of welding.
  • the inlet disc 120 has perforations 130, 140 in order for premix gas to enter the burner 100. The premix gas, once flown through the perforations 130, 140 of the inlet disc 120, will flow through the
  • the inlet disc 120 is having large perforations 130 in the central zone (e.g. of diameter 3.60 mm) and small perforations 140 outside the central zone (e.g. of diameter 2.50 mm).
  • the distance between the center points of adjacent perforations is constant, e.g. 5 mm.
  • a total of 37 large perforations 130 (of 3.6 mm diameter) are located in the central zone; and a total of 72 small perforations 140 (of 2.5 mm diameter) around the central zone.
  • a zone 150 is present without any perforations, which is the zone outside a diameter of 52.5 mm (which is in this example outside 76 % of the internal diameter of the cylindrical premix gas burner 1 10).
  • the burner of the example has a length of 92.6 mm.
  • the cylindrical burner deck 1 10 has a length of 92.6 mm and the length L over which it is perforated is 73.2 mm.
  • the perforation pattern in the perforated plate that forms the burner deck 1 10 is a combination of slits and round holes.
  • the thickness of the perforated plate is 0.6 mm, the slits being 4.0 * 0.5 mm, the holes having a diameter of 0.8 mm.
  • the first 1 1 .8 mm of the perforated burner deck length has a porosity of 15%, thereafter is a zone of 55.6 mm of the burner deck length with a porosity of 7.3% and the last zone with a length of 5.8 mm of the burner deck length having a porosity of 16.5%.
  • This pattern is repeated over the burner deck on the circumference of the burner. This provides a burner deck with an overall porosity of 9.8%.

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

Abstract

The invention discloses a cylindrical premix gas burner (100) that is comprising a cylindrical burner deck (110), which is comprising a perforated metal plate. The cylindrical premix gas burner (100) is delimited by an end cap (1 15). At the opposite side of the end cap, an inlet disc (120) with perforations is provided for the supply of a premix of combustible gas and air into the burner and which is to be burnt on the outside of the cylindrical burner deck (110) after the premix gas has flown through it. The inlet disc is comprising - a multiple of perforations (130) for premix gas supply in a central zone of the plate, - and a multiple of perforations (140) for premix gas supply in the peripheral zone of the inlet disc (120). The porosity of the inlet disc is higher in the central zone than in a peripheral zone. The average surface area of the perforations in the central zone of the inlet disc is less than 20 mm2.

Description

Premix gas burner
Description
Technical Field
[1 ] The invention relates to a cylindrical premix gas burner, and specifically to such burners with a perforated plate as cylindrical burner deck. The cylindrical premix gas burner has an inlet disc for the entry of premix of air and combustible gas into the cylindrical premix gas burner. Such burners find use in boilers and in instantaneous water heaters.
Background Art
[2] Cylindrical premix gas burners that have a perforated plate as cylindrical burner deck are known. Patent publications WO2009/065733,
WO201 1/069839 and EP2037175A2 provide examples of such burners. These examples are provided without the use of a second cylindrical element in the burner that would act as distributor of premix gas inside the burner prior to the premix gas flowing through the cylindrical burner deck. The premix gas is burned at the outside of the cylindrical burner deck.
[3] The cylindrical burners as disclosed in WO2009/065733 and
EP2037175A2 are provided with an inlet disc with a multiple of
perforations for the supply of premix gas into chamber enclosed by the cylindrical burner.
[4] Emissions of CO and of NOX (nitrogen oxides) have to be as low as
possible. Legislation is imposing lower limits for such emissions, requiring burners to be provided with lower NOX emissions than the burners as known in the art.
Disclosure of Invention
[5] The primary objective of the invention is to provide a cylindrical premix gas burner that results in lower emission values, especially of NOX (nitrogen oxides) than the cylindrical premix gas burners that are known in the art. [6] The invention discloses a cylindrical premix gas burner which is
comprising a cylindrical burner deck. The cylindrical burner deck is comprising a perforated metal plate. Preferably, the cylindrical burner deck is a perforated metal plate, without any other layer on either side of the perforated metal plate. The cylindrical premix gas burner is delimited by an end cap. At the opposite side of the end cap, an inlet disc with perforations is provided for the supply of a premix of combustible gas and air into the burner. The premix gas will be burnt on the outside of the cylindrical burner deck after the premix gas has flown through it.
The inlet disc is comprising
- a multiple of perforations (preferably cylindrical perforations, and preferably at least seven perforations) for premix gas supply in a central zone of the plate, the central zone is the zone on the inlet disc around the centre point of the inlet disc. The centre point is where the central axis of the cylindrical premix gas burner crosses the inlet disc.
- and a multiple of perforations (preferably cylindrical holes) for premix gas supply in the peripheral zone of the inlet disc, which is the zone of the inlet disc outside the central zone.
The porosity of the inlet disc is higher in the central zone than in the peripheral zone. The average surface area of the perforations in the central zone of the inlet disc is less than 20 mm2, and preferably less than 13 mm2, and more preferably less than 10 mm2.
The cylindrical burner of the invention e.g. has an internal diameter of more than 50 mm.
[7] The term "porosity" is to be understood, in the light of this invention, as the ratio of the surface of the holes, slots or other perforations divided by the surface over which the holes, slots or other perforations are located.
[8] It is a benefit of a cylindrical premix gas burner according to the invention that lower levels of NOX (nitrogen oxides) are measured in the flue gas of the burner. This is of specific interest, as legislation on emissions is becoming more and more stringent.
[9] Preferably, the porosity in the central zone is between 25 and 50% of the surface area of the central zone, more preferably between 30 and 40%. Preferably the porosity in the peripheral zone is 15 to 30%, more preferred between 17 and 25% of the surface area of the peripheral zone. These embodiments provide even lower NOX results.
[10] Preferably, the average porosity of the inlet disc (calculated for the full inner diameter of the cylindrical premix gas burner) is between 20% and 50%, more preferably between 25% and 40%.
[1 1 ] Preferably, the cylindrical premix gas burner is devoid of a diffuser inside the cylindrical perforated burner deck. It means that premix gas is flowing through the inlet disc, and without no further physical obstacles it is flowing through the perforations of the cylindrical burner deck to be burnt on the outside of the cylindrical burner deck.
[12] Preferably, the section of the inlet disc that is covered by the cylindrical burner deck is flat, which makes that perforations in the inlet disc for the supply of premix gas are easy and cheap to produce.
[13] In a preferred embodiment, the porosity of the inlet disc is higher in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner, compared to the porosity in a peripheral zone between 35% and 75% of the inner diameter of the cylindrical gas burner. With "in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner" is meant the zone within a circle around the centre point of the inlet disc that is having a diameter of 20% of the inner diameter of the cylindrical premix gas burner. In this embodiment, the preferred porosity in that central zone is between 25 and 50% of the surface area of that central zone, more preferably between 30 and 40%. Preferably the porosity in that peripheral zone is 15 to 30%, more preferred between 17 and 25% of its surface area. Preferably, the central zone comprises at least seven perforations. These embodiments provide lower NOX results.
[14] In a preferred embodiment, the inlet disc is not permeable to premix gas in the zone between 80% and 100% of the inner diameter of the cylindrical premix gas burner. The circles with these diameters are considered around the centre point of the inlet disc. The benefit of this embodiment is that further reduced NOX values are obtained in burners according to this embodiment.
[15] In another preferred embodiment, the porosity of the inlet disc in the
central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner is in absolute terms at least 8 % higher (and preferably at least 10 %, more preferably at least 15 % higher) than the porosity of the inlet disc in the zone between 35% and 75% of the inner diameter of the cylindrical premix gas.
[16] In an embodiment of the invention, each of the perforations in the zone between 40% and 75% of the inner diameter of the cylindrical gas burner are of the same size.
[17] In an embodiment of the invention, each of the perforations in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner have a surface area of less than 20 mm2, and preferably less than 13 mm2 and more preferably less than 10 mm2.
[18] In an embodiment of the invention, the average surface area of the
perforations in the central zone is between 1 .22 and 9 times, more preferably between 1 .22 and 2.5 times the average surface area of the perforations in the peripheral zone. Preferred are circular perforations.
[19] In another embodiment, the perforations (for premix gas supply) in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner are all of the same shape and size.
[20] In a more preferred embodiment, the perforations in the inlet disc (meant are the perforations that are provided for the supply of premix gas in the burner) are all of the same size; and the density of the perforations in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner is on average higher (and preferably at least 10% in relative terms, more preferably at least 50 higher in relative terms) than the average density of the perforations in the zone between 20% and 75% of the inner diameter of the cylindrical premix gas burner. With the density of the perforations is meant the number of perforations relative to the surface area.
[21 ] In a preferred embodiment, the average porosity of the cylindrical burner deck of less than 1 1 %. Along the length of the cylindrical premix gas burner, the cylindrical burner deck can have circumferential zones of different porosity (of preferably at least 25% of the length of the perforated zone of the cylindrical metallic burner membrane), with an absolute difference in porosity of more than 3%. With circumferential zone is meant a cylindrical part of the cylindrical burner deck; and the porosity of the circumferential zone is the total perforated area of that zone relative to the total area of the circumferential zone.
[22] In a more preferred embodiment of the invention, the cylindrical burner deck has
- at the inlet disc a first zone over a length of at least 8 mm (and preferably at least 10 mm and preferably below 25 mm, more preferably below 15 mm) as measured in the direction of the axis of the cylindrical premix gas burner, that is provided with perforations and wherein the porosity of the first zone is higher than 12%, preferably between 14 and 16%; and
- over a length of at least 30 mm (and preferably at least 50 mm at preferably below 100 mm) as measured in the direction of the axis of the cylindrical premix gas burner, a zone with perforations, the porosity of the zone is less than 10%, preferably between 7 and 8.5%.
And preferably the average porosity of the cylindrical burner deck is less than 1 1 %.
Burners according to such embodiments of the invention have shown to have even better results in NOX (lower NOX) thanks to the synergy between the features of the inlet disc and the features of the metallic burner membrane. Surprisingly, such burners showed to generate less noise, even than the burners of WO201 1/069839, due to the synergetic effect of the perforations in the inlet disk and the perforations in the burner deck. [23] In a further preferred embodiment, the burner deck has a third section, further away from the inlet disc than the perforated section with porosity less than 10%, wherein the third section is having a porosity higher than 12%, preferably between 14 and 16%. A burner according to these embodiment of the invention has shown to have even better results in NOX (lower NOX) thanks to the synergy between the features of the inlet disc and the features of the metallic burner membrane. Surprisingly, such burners showed to generate less noise, even than the burners of
WO201 1/069839, due to the synergetic effect of the perforations in the inlet disk and the perforations in the burner deck
[24] The cylindrical premix gas burner according to the invention can
advantageously by used in boilers or instantaneous water heater. The benefit is that the boilers or instantaneous water heater have lower NOX emissions.
Brief Description of Figures in the Drawings
[25] Figure 1 shows an example of a cylindrical premix gas burner according to the invention.
Mode(s) for Carrying Out the Invention
[26] Figure 1 shows a section of an example of a cylindrical premix gas burner 100 according to the invention. The burner 100 has a perforated plate that forms the cylindrical burner deck 1 10 (perforations in the cylindrical burner deck 1 10 are only partly shown in the figure), with inner diameter 69.2 mm. The burner 100 is delimited by an end cap 1 15. At the opposite side of the end cap 1 15 an inlet disc 120 is present, that can have a flange 125 with holes 127 for connection of the burner e.g. in a burner housing. The inlet disc 120 can be connected to the cylindrical burner deck 1 10 by means of welding. The inlet disc 120 has perforations 130, 140 in order for premix gas to enter the burner 100. The premix gas, once flown through the perforations 130, 140 of the inlet disc 120, will flow through the
perforations of the cylindrical burner deck 1 10 and combustion takes place on the external surface of the cylindrical burner deck 1 10. No diffuser is positioned inside the cylindrical burner deck.
[27] In the example, the inlet disc 120 is having large perforations 130 in the central zone (e.g. of diameter 3.60 mm) and small perforations 140 outside the central zone (e.g. of diameter 2.50 mm). In the example, the distance between the center points of adjacent perforations is constant, e.g. 5 mm. In the example, a total of 37 large perforations 130 (of 3.6 mm diameter) are located in the central zone; and a total of 72 small perforations 140 (of 2.5 mm diameter) around the central zone. Around the small perforations 140 and till the surface of the cylindrical burner deck 1 10, a zone 150 is present without any perforations, which is the zone outside a diameter of 52.5 mm (which is in this example outside 76 % of the internal diameter of the cylindrical premix gas burner 1 10).
[28] The burner of the example has a length of 92.6 mm. The cylindrical burner deck 1 10 has a length of 92.6 mm and the length L over which it is perforated is 73.2 mm. The perforation pattern in the perforated plate that forms the burner deck 1 10 is a combination of slits and round holes. The thickness of the perforated plate is 0.6 mm, the slits being 4.0 * 0.5 mm, the holes having a diameter of 0.8 mm.
[29] The perforations on the cylindrical burner deck of the example can be
grouped in a pattern, wherein the first 1 1 .8 mm of the perforated burner deck length has a porosity of 15%, thereafter is a zone of 55.6 mm of the burner deck length with a porosity of 7.3% and the last zone with a length of 5.8 mm of the burner deck length having a porosity of 16.5%. This pattern is repeated over the burner deck on the circumference of the burner. This provides a burner deck with an overall porosity of 9.8%.
[30] The burner showed to have low NOX emission values.

Claims

Claims
1 . Cylindrical premix gas burner, comprising a cylindrical burner deck, wherein said cylindrical burner deck is comprising a perforated metal plate, and wherein the cylindrical premix gas burner is delimited by an end cap, wherein at the opposite side of said end cap, an inlet disc with perforations is provided for the supply of a premix of combustible gas and air into said burner and which is to be burnt on the outside of said cylindrical burner deck after the premix gas has flown through it,
characterized in that said inlet disc is comprising
- a multiple of perforations for premix gas supply in a central zone of said plate, the central zone is the zone on the inlet disc around the centre point of said inlet disc,
- and a multiple of perforations for premix gas supply in the peripheral zone of said inlet disc, which is the zone of said inlet disc outside said central zone; wherein the porosity of said inlet disc is higher in the central zone than in a peripheral zone,
and wherein the average surface area of the perforations in the central zone of the inlet disc is less than 20 mm2.
2. Cylindrical premix gas burner as in claim 1 , wherein the porosity of said inlet disc is higher in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner, compared to the porosity in the peripheral zone between 35% and 75% of the inner diameter of the cylindrical gas burner.
3. Cylindrical premix gas burner as in any of the preceding claims, wherein said central zone comprises at least seven perforations.
4. Cylindrical premix gas burner as in any of the preceding claims, wherein the inlet disc is not permeable to premix gas in the zone between 80% and 100% of the inner diameter of the cylindrical premix gas burner.
5. Cylindrical premix gas burner as in any of the preceding claims, wherein the porosity of the inlet disc in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner is in absolute terms at least 8 % higher than the porosity of the inlet disc in the zone between 35% and 75% of the inner diameter of the cylindrical premix gas.
6. Cylindrical premix gas burner as in any of the preceding claims, wherein each of the perforations in the zone between 40% and 75% of the inner diameter of the cylindrical gas burner are of the same size.
7. Cylindrical premix gas burner as in any of the preceding claims, wherein each of said perforations in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner have a surface area of less than 20 mm2.
8. Cylindrical premix gas burner as in any of the preceding claims, wherein the average surface area of the perforations in said central zone is between 1 .22 and 9 times the average surface area of the perforations in said peripheral zone.
9. Cylindrical premix gas burner as in claims 1 to 7, wherein the perforations in the central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner are all of the same shape and size.
10. Cylindrical premix gas burner as in claims 1 to 8, wherein the perforations in the inlet disc are all of the same size and wherein the density of the
perforations in said central zone with a diameter of 20% of the inner diameter of the cylindrical premix gas burner is on average higher than the average density of the perforations in the zone between 20% and 75% of the inner diameter of the cylindrical premix gas burner.
1 1 . Cylindrical premix gas burner as in any of the preceding claims,
with an average porosity of the cylindrical burner deck of less than 1 1 %; and wherein along the length of the cylindrical premix gas burner, said cylindrical burner deck has circumferential zones of different porosity, with at least two zones with an absolute difference in porosity of more than 3%.
12. Cylindrical premix gas burner as in any of the preceding claims, wherein the cylindrical burner deck has
- at said inlet disc a first zone over a length of at least 8 mm, as measured in the direction of the axis of the cylindrical premix gas burner, provided with perforations and wherein the porosity of said first zone is higher than 12%; and
- over a length of at least 30 mm as measured in the direction of the axis of the cylindrical premix gas burner, a zone with perforations, the porosity of said zone is less than 10%, preferably between 7 and 8.5%.
13. Boiler or instantaneous water heater comprising a cylindrical premix gas
burner as in any of the preceding claims.
EP13702067.3A 2012-02-16 2013-02-04 Premix gas burner Withdrawn EP2815179A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13702067.3A EP2815179A1 (en) 2012-02-16 2013-02-04 Premix gas burner

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12155790 2012-02-16
EP13702067.3A EP2815179A1 (en) 2012-02-16 2013-02-04 Premix gas burner
PCT/EP2013/052121 WO2013120715A1 (en) 2012-02-16 2013-02-04 Premix gas burner

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EP2815179A1 true EP2815179A1 (en) 2014-12-24

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WO (1) WO2013120715A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP4163544A1 (en) 2021-10-07 2023-04-12 BDR Thermea Group B.V. Burner deck and process of manufaturing thereof

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WO2017194394A1 (en) 2016-05-13 2017-11-16 Bekaert Combustion Technology B.V. Gas premix burner with a cylindrical burner deck
US20190113228A1 (en) * 2016-05-13 2019-04-18 Bekaert Combustion Technology B.V. Cylindrical gas premix burner

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ITMI20071751A1 (en) 2007-09-12 2009-03-13 Polidoro S P A PREMIXED BURNER
ITPD20070388A1 (en) 2007-11-19 2009-05-20 Sit La Precisa S P A Con Socio BURNER, IN PARTICULAR GAS BURNER WITH PRE-MIXING
US20120193452A1 (en) 2009-12-11 2012-08-02 Nv Bekaert Sa Burner with low porosity burner deck

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4163544A1 (en) 2021-10-07 2023-04-12 BDR Thermea Group B.V. Burner deck and process of manufaturing thereof
WO2023057605A1 (en) 2021-10-07 2023-04-13 Bdr Thermea Group B.V. Burner deck and process of manufaturing thereof

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