EP2510281A1 - Burner with low porosity burner deck - Google Patents

Burner with low porosity burner deck

Info

Publication number
EP2510281A1
EP2510281A1 EP10782307A EP10782307A EP2510281A1 EP 2510281 A1 EP2510281 A1 EP 2510281A1 EP 10782307 A EP10782307 A EP 10782307A EP 10782307 A EP10782307 A EP 10782307A EP 2510281 A1 EP2510281 A1 EP 2510281A1
Authority
EP
European Patent Office
Prior art keywords
burner
gas
deck
metal plate
perforated metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10782307A
Other languages
German (de)
French (fr)
Other versions
EP2510281B1 (en
Inventor
Dirk Ten Hoeve
Dinand Lamberts
Camillo Marino Josef Hogenbirk
Bram De Jager
Koen Vanoverberghe
Gertjan Zwiggelaar
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 NV SA
Bekaert Combustion Technology BV
Original Assignee
Bekaert NV SA
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
Family has litigation
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Application filed by Bekaert NV SA, Bekaert Combustion Technology BV filed Critical Bekaert NV SA
Priority to EP17191076.3A priority Critical patent/EP3282187B1/en
Priority to EP10782307.2A priority patent/EP2510281B1/en
Publication of EP2510281A1 publication Critical patent/EP2510281A1/en
Application granted granted Critical
Publication of EP2510281B1 publication Critical patent/EP2510281B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • F23D14/105—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head with injector axis parallel to the burner head axis
    • 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
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/10—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with elongated tubular burner head
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/26—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • 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
    • F23D2203/1023—Flame diffusing means using perforated plates with specific free passage areas

Definitions

  • the present invention relates to a prennix burner, more in particular a
  • burner having a flameholder made of perforated metal plate material.
  • the burner is a tubular burner having a cylindrical shape. These burners are especially suitable for use in combustion boilers.
  • One known type of premix burner consist of one or more of the following components: a) an end cap located at the top of the burner, b) a burner deck, the burner deck consists of a blind piece at the bottom, a perforated piece, with a regular (circular) pattern, with sometimes locally an additional modification for ignition purposes, in the centre part and a blind piece at the top.
  • the pattern is mostly circumferential, and mostly repeating itself in height after a pitch of 1-10 mm; c) a distributor, having a blind piece at the bottom, a perforated part in the centre and a blind piece at the top; d) a distributor end cap; e) a flange; f) an anti noise tube which is a device located in or nearby the flange to adjust the pressure distribution.
  • a distributor having a blind piece at the bottom, a perforated part in the centre and a blind piece at the top
  • d) a distributor end cap e) a flange; f) an anti noise tube which is a device located in or nearby the flange to adjust the pressure distribution.
  • Such premix burners are described in e.g. EP 1337789, EP2037175,
  • these burners are provided with devices in the mixing chamber, such as e.g. an inner liner, also called distributor and/or anti-noise tube or other devices such as swirls or perforated disks in or nearby the flange.
  • devices in the mixing chamber such as e.g. an inner liner, also called distributor and/or anti-noise tube or other devices such as swirls or perforated disks in or nearby the flange.
  • These devices are needed for stabilization of flames on these burners, which has an effect on noise and emissions.
  • the need of using these devices implies a considerable complication for making the burner and for the assemblage and implies a considerable cost.
  • the object of the present invention is to obviate the drawbacks mentioned above.
  • An object of the present invention is to provide a premix burner which does not need such devices in the mixing chamber of the burner to obtain a good stability of the flames and to reduce or even eliminate noise problems.
  • a further object of the present invention is to provide a premix burner with a good stability over the full operating range of high to low C0 2 , and for the full band of customary or natural gas qualities.
  • the present invention does not relate specifically to high reactive fuel gases, which are a mixture of hydrogen and customary fuel gases.
  • a further object of the present invention is to provide a premix burner
  • An aspect of the claimed invention provides a gas burner preferably a
  • premix burner comprising a support having a central gas inlet port for supply of gas into a gas supply chamber.
  • the gas supply chamber is enclosed by a perforated metal plate.
  • the perforations in said perforated metal plate providing a burner deck.
  • the perforated metal plate is connected at the bottom to the support through a base section.
  • the burner deck has an overall porosity which is equal to or lower than 1 1 %, preferably lower than 10%, even more preferably lower than 9%.
  • the present invention provides a gas burner as
  • the burner further comprises an end cap connected to the perforated metal plate substantially opposite to said gas inlet port.
  • the present invention provides a gas burner as
  • the end cap is also provided with perforations. These perforations thereby enlarge and are part of the burner deck.
  • the end cap is made of metal plate material.
  • the perforation patterns in the end cap and in the perforated metal plate are equal.
  • the perforation patterns in the end cap and in the perforated metal plate are different.
  • the perforations, such as e.g. slots and holes, in the end cap and in the perforated metal plate are equal.
  • the perforations in the end cap and in the perforated metal plate are different.
  • Another aspect of the claimed invention provides a gas burner as
  • the burner deck has different patterns of perforations. Adding more patterns with different pitches showed an increased stability for a broader range of gas qualities and induced less NOx-emissions.
  • the burner is provided with an abrupt and stepwise variation of the perforation pattern in the burner deck.
  • the present invention provides a burner with
  • the burner has a completely random deck with no repeatability over the full height or circumference of the burner deck which provides a stabilized deck without the additional devices as mentioned above.
  • the part with a porosity higher than 1 1 % is closest to the gas inlet.
  • the part with a porosity equal to or lower than 9% is most remote, i.e. downstream, from the gas inlet.
  • burner deck is to be understood, in the light of this invention, to be that part of the burner where the totality of perforations are present. In case two or more distinct regions of perforations can be detected on the burner surface, the burner deck is defined as being the surface spanning of all regions with perforations.
  • all porosity of the burner deck is to be understood, in the light of this invention, as ratio of the surface of the holes, slots or other openings divided by the surface of the burner over which the perforated part(s) is(are) located.
  • Figure 1 shows an example embodiment according to a first aspect of the present invention.
  • Figures 2A and 2B show an example embodiment according to a second aspect of the present invention.
  • Figure 2C shows an example perforation pattern according to a second aspect of the present invention.
  • FIG. 3 shows an example embodiment according to a third aspect of the present invention.
  • FIG. 4 shows an example embodiment according to a further aspect of the present invention.
  • FIG. 5 shows an example embodiment according to a further aspect of the present invention.
  • FIG. 6 shows an example embodiment according to a further aspect of the present invention.
  • Figure 7 shows an example embodiment according to a further aspect of the present invention.
  • Figure 8 shows an example embodiment according to a further aspect of the present invention.
  • FIG. 9 shows an example embodiment according to a further aspect of the present invention.
  • FIG. 10 shows a further example embodiment according to an aspect of the present invention.
  • FIG. 1 1 shows a further example embodiment according to an aspect of the present invention.
  • FIG. 1 shows a gas burner 10, preferably a premix burner, comprising a support or flange 12 which has a central gas inlet port 14 for supply of gas into a gas supply or mixing chamber 16.
  • the gas supply chamber 16 is enclosed by a perforated metal plate 22.
  • the perforated metal plate 22 is connected at the bottom to the support or flange 12 through a base section.
  • the perforations 24 in the perforated metal plate 22 provide the burner deck 20.
  • the burner deck 20 has an overall porosity which is equal to or lower than 1 1 %, preferably lower than 10%, even more preferably lower than 9%.
  • Figure 2A shows a perspective view of a burner according to the present invention.
  • Figure 2B shows a cross sectional view taken along the line II- ⁇ in Figure 2A.
  • Figures 2A and 2B shows a gas burner 10, preferably a premix burner, comprising a support or flange 12 which has a central gas inlet port 14 for supply of gas into a gas supply or mixing chamber 16.
  • the gas supply chamber 16 is enclosed by a perforated metal plate 22 and an end cap 18 substantially opposite to said gas inlet port 14.
  • perforations 24 in the perforated metal plate 22 provide the burner deck 20.
  • the end cap 18 is connected to the top of the perforated metal plate 22 and the perforated metal plate 22 is connected at the bottom to the support or flange 18 through a base section.
  • the burner deck 20 has an overall porosity which is equal to or lower than 1 1 %, preferably lower than 10%, even more preferably lower than 9%.
  • a burner 10 with a perforation pattern as shown in figure 2C has a length of 102,4mm and diameter of 70,4mm.
  • the burner deck has a length of 81 ,2 mm and has a porosity of 7,7%.
  • the perforation pattern in the perforated plate is a combination of slits and round holes.
  • the perforated plate For a thickness of the perforated plate of 0,6 mm, the slits being 4,0x0,5mm, the holes having a diameter of 0,8mm.
  • the perforations are grouped in a pattern of 4,8 mm and this pattern is repeated over the burner deck in an equal division. As explained above, this burner still needed an anti-noise device, but no pressure divider or distributor anymore.
  • a further aspect of the present invention provides a burner 10 wherein the end cap 18 is also provided with perforations.
  • Figure 3 shows an exemplary burner according to the present invention wherein the end cap is provided with perforations 30.
  • the burner deck of this burner is as shown by reference number 20.
  • a further aspect of the present invention provides a burner 10 with a
  • burner deck wherein more than 50% of the burner deck has a porosity being equal to or lower than 9% and wherein 10 to 50% of the burner deck has a porosity being higher than 1 1 %.
  • the burner deck has an overall porosity which is equal to or lower than 1 1 %.
  • a burner 10 as shown in figure 4 has a length of 94,8mm and diameter of 70,4mm.
  • the burner deck 20 has a length of 93,6mm.
  • the perforation pattern in the perforated plate 22 is a combination of slits and round holes.
  • the thickness of the perforated plate 22 is 0,6 mm, the slits being 4,0x0,5mm, the holes having a diameter of 0,8mm.
  • the perforations are grouped in a pattern as shown in fig.
  • This modification of the perforation pattern of the burner deck provided a burner which, next to the effect of the deletion of the diffuser and the removal of the humming noise, also had a more stable response on the second and higher Helmholtz or instable acoustic resonances of the heat exchanger, which therefore made that the burner did not provoke a whistling sound anymore.
  • the humming sound was eliminated and therefore the use of anti-noise devices in the mixing chamber of the burner could be omitted.
  • the use of the relatively high porosity at the beginning and end of the burner deck 20 provide an even more stable flame pattern of the burner.
  • the invention provides a gas burner with a perforated metal plate 22 with a perforation pattern as shown in fig. 5.
  • the shown perforation pattern is repeated over the circumference of the burner.
  • the burner deck 20 has different patterns of perforations. Adding more patterns with different pitches showed an increased stability for a broader range of gas qualities and induced less NOx-emissions.
  • the exemplary perforation pattern of fig. 5 is an abrupt and stepwise variation of the perforation pattern in the burner deck 20.
  • Figure 6 shows another example of a perforation pattern of burner deck 20 according to a preferred aspect of the present invention, wherein the porosity of the burner deck 20 decreases stepwise in downstream direction.
  • the shown perforation pattern is repeated in the perforated metal plate 22 over the circumference of the burner.
  • Figure 7 shows an example of a perforation pattern of burner deck 20 according to a preferred aspect of the present invention, wherein the porosity is gradually increasing. This perforation pattern is repeated in the perforated metal plate 22 over the circumference of the burner.
  • Figure 8 shows an exemplary perforation pattern of the burner deck 20, which is repeated lengthwise over the perforated metal plate 22.
  • Figure 9 shows a further exemplary perforation pattern which is repeated on the circumference of a burner.
  • the perforation pattern is such that no repeat of pattern is occurring along the length of the burner deck 20.
  • An exemplary burner with a length of 91 ,2mm and diameter of 70,4mm.
  • the burner deck has a length of 70,4mm.
  • the perforation pattern in the perforated plate 22 is a combination of slits and round holes as shown in figure 9. For a thickness of the perforated plate 22 of 0,6 mm, the slits being 4, 0x0, 5mm, the holes having a diameter of 0,8mm, this burner deck has an overall porosity of 7.5%.
  • FIG. 10 Another preferred embodiment of the present invention is shown in figure 10.
  • the burner 10 made out of perforated metal plate 22 has a completely random perforated burner deck 20 with no repeatability over the full height or circumference of the burner deck which provides a stabilized deck without the additional devices as mentioned above.
  • Figure 1 1 shows another exemplary embodiment of the present invention.
  • This burner has a perforated end cap 24 with different perforation pattern than the perforated metal plate 22.
  • the perforations 30 together with the perforations 24 provide the burner deck 20.
  • a gas burner preferably a premix burner, comprising a support which has a central gas inlet port for supply of gas into a gas supply chamber.
  • the gas supply chamber is enclosed by a perforated metal plate and an end cap substantially opposite to said gas inlet port.
  • the perforations in the perforated metal plate provide a burner deck.
  • the end cap is connected to the top of the perforated metal plate and the perforated metal plate is connected at the bottom to the support through a base section.
  • the burner deck has an overall porosity which is equal to or lower than 1 1 %.
  • the present invention also provides use of this burner, e.g. in heat exchangers.

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 gas burner (10), preferably a premix burner, comprising a support (12) which has a central gas inlet port for supply of gas into a gas supply chamber. The gas supply chamber is enclosed by a perforated metal plate (22). The perforated metal plate is connected at the bottom to the support through a base section. The perforations in the perforated metal plate provide a burner deck (20). The burner deck has an overall porosity which is equal to or lower than 11%. The present invention also provides use of this burner, e.g. in heat exchangers.

Description

BURNER WITH LOW POROSITY BURNER DECK
Description
Technical Field
[0001] The present invention relates to a prennix burner, more in particular a
burner having a flameholder made of perforated metal plate material.
Preferably, the burner is a tubular burner having a cylindrical shape. These burners are especially suitable for use in combustion boilers.
Background Art
[0002] One known type of premix burner consist of one or more of the following components: a) an end cap located at the top of the burner, b) a burner deck, the burner deck consists of a blind piece at the bottom, a perforated piece, with a regular (circular) pattern, with sometimes locally an additional modification for ignition purposes, in the centre part and a blind piece at the top. The pattern is mostly circumferential, and mostly repeating itself in height after a pitch of 1-10 mm; c) a distributor, having a blind piece at the bottom, a perforated part in the centre and a blind piece at the top; d) a distributor end cap; e) a flange; f) an anti noise tube which is a device located in or nearby the flange to adjust the pressure distribution. Such premix burners are described in e.g. EP 1337789, EP2037175,
WO2009/077333, WO2009/065733, WO2009/059933. As can be seen in most of above referenced documents, these burners are provided with devices in the mixing chamber, such as e.g. an inner liner, also called distributor and/or anti-noise tube or other devices such as swirls or perforated disks in or nearby the flange. These devices are needed for stabilization of flames on these burners, which has an effect on noise and emissions. The need of using these devices implies a considerable complication for making the burner and for the assemblage and implies a considerable cost.
Disclosure of Invention
[0003] The object of the present invention is to obviate the drawbacks mentioned above.
[0004] An object of the present invention is to provide a premix burner which does not need such devices in the mixing chamber of the burner to obtain a good stability of the flames and to reduce or even eliminate noise problems.
[0005] A further object of the present invention is to provide a premix burner with a good stability over the full operating range of high to low C02, and for the full band of customary or natural gas qualities.
[0006] This full band of customary and natural gas qualities covers all gases
selected from hydrocarbons such as methane, ethane, propane, butane, ethene, propene, butene, acetylene, and the like. In contrast with WO 95/23315, the present invention does not relate specifically to high reactive fuel gases, which are a mixture of hydrogen and customary fuel gases.
[0007] A further object of the present invention is to provide a premix burner
producing low NOx levels.
[0008] An aspect of the claimed invention provides a gas burner preferably a
premix burner, comprising a support having a central gas inlet port for supply of gas into a gas supply chamber. The gas supply chamber is enclosed by a perforated metal plate. The perforations in said perforated metal plate providing a burner deck. The perforated metal plate is connected at the bottom to the support through a base section. The burner deck has an overall porosity which is equal to or lower than 1 1 %, preferably lower than 10%, even more preferably lower than 9%.
[0009] In a further aspect, the present invention provides a gas burner as
described above wherein the burner further comprises an end cap connected to the perforated metal plate substantially opposite to said gas inlet port.
[0010] In a preferred aspect, the present invention provides a gas burner as
described in paragraph 8, wherein the end cap is also provided with perforations. These perforations thereby enlarge and are part of the burner deck. In a preferred aspect, the end cap is made of metal plate material. In a further preferred aspect, the perforation patterns in the end cap and in the perforated metal plate are equal. In an alternative further aspect, the perforation patterns in the end cap and in the perforated metal plate are different. In a further preferred aspect, the perforations, such as e.g. slots and holes, in the end cap and in the perforated metal plate are equal. In an alternative further aspect, the perforations in the end cap and in the perforated metal plate are different.
[001 1] Conventional premix burners have a porosity in the range of 14 to 18%. It was surprisingly found that lowering the porosity of the burner deck decreased acoustic time-lag of the flames formed on the burner deck, which enabled us to make a burner which did not need a diffuser anymore. It was also surprisingly found that this burner had an unstable burning when this burner was operated in open air, but when applied inside a heat exchanger, this burner had a stable flame and burning pattern. This burner also had a more stable response on the first Helmholtz resonance of the heat exchanger and its peripheral parts, which therefore made that the burner did not provoke low frequency thermo-acoustic instabilities, often referred to as humming. However, during start sequences under cold conditions with this burner build in, the boiler sometimes suffered a humming sound which sometimes makes the burner still needing an anti- noise device in its mixing chamber. The use of the anti-noise device in this burner also has a positive effect on the CO emission. Also it was found that lowering the porosity did not dampen thermo-acoustic instabilities with a higher frequency than the first Helmholtz resonance of the boiler, often referred to as whistling or howling. To cancel these frequencies, the anti- noise device was necessary again.
[0012] In a further aspect of the present invention, the gas burner of the type
described above has a burner deck wherein more than 50% of the burner deck has a porosity being equal to or lower than 9% and wherein upto 50% of the burner deck has a porosity being higher than 1 1 % and with an overall porosity which is equal to or lower than 1 1 %. This modification of the perforation pattern of the burner deck provided a burner which, next to the effect of the deletion of the diffuser and the removal of the humming noise, also had a more stable response on the second and higher
Helmholtz or instable acoustic resonances of the heat exchanger, which therefore made that the boiler, with this build in burner did not provoke a whistling sound anymore. Next to that, during start sequences under cold conditions, the humming sound was eliminated and therefore the use of anti-noise devices in the mixing chamber of the burner could be omitted. Furthermore, this provided a stabilized deck over the full operating range of high to low C02, and for a broad range of gas qualities.
[0013] Another aspect of the claimed invention provides a gas burner as
described in [0007], [0008], [0009] or [001 1] wherein the burner deck has different patterns of perforations. Adding more patterns with different pitches showed an increased stability for a broader range of gas qualities and induced less NOx-emissions. In a preferred aspect, the burner is provided with an abrupt and stepwise variation of the perforation pattern in the burner deck.
[0014] In a preferred aspect, the present invention provides a burner with
gradually increasing or decreasing perforation pattern or gradually increasing or decreasing pitches in between the perforation pattern of the burner deck. This grading can go in axial or circumferential direction. Gradually increasing or decreasing the perforation of the decks allows an almost step less variety of the perforation, and thus creating a varying perforation of the surface of the deck. In another preferred embodiment of the present invention, the burner has a completely random deck with no repeatability over the full height or circumference of the burner deck which provides a stabilized deck without the additional devices as mentioned above.
[0015] Most preferably, in order to improve flame stability, there is a decreased porosity when going downstream. In an embodiment, the part with a porosity higher than 1 1 % is closest to the gas inlet. The part with a porosity equal to or lower than 9% is most remote, i.e. downstream, from the gas inlet.
[0016] Definitions
[0017] The term "burner deck" is to be understood, in the light of this invention, to be that part of the burner where the totality of perforations are present. In case two or more distinct regions of perforations can be detected on the burner surface, the burner deck is defined as being the surface spanning of all regions with perforations.
[0018] The term "overall porosity of the burner deck" is to be understood, in the light of this invention, as ratio of the surface of the holes, slots or other openings divided by the surface of the burner over which the perforated part(s) is(are) located.
[0019] The term "perforation pattern" is to be understood, in the light of this
invention, to be a recurring scheme of perforations.
Brief Description of Drawings
[0020] Example embodiments of the invention are described hereinafter with
reference to the accompanying drawings in which
[0021] - Figure 1 shows an example embodiment according to a first aspect of the present invention.
[0022] - Figures 2A and 2B show an example embodiment according to a second aspect of the present invention. Figure 2C shows an example perforation pattern according to a second aspect of the present invention.
[0023] - Figure 3 shows an example embodiment according to a third aspect of the present invention.
[0024] - Figure 4 shows an example embodiment according to a further aspect of the present invention.
[0025] - Figure 5 shows an example embodiment according to a further aspect of the present invention.
[0026] - Figure 6 shows an example embodiment according to a further aspect of the present invention.
[0027] - Figure 7 shows an example embodiment according to a further aspect of the present invention.
[0028] - Figure 8 shows an example embodiment according to a further aspect of the present invention.
[0029] - Figure 9 shows an example embodiment according to a further aspect of the present invention.
[0030] - Figure 10 shows a further example embodiment according to an aspect of the present invention. [0031] - Figure 1 1 shows a further example embodiment according to an aspect of the present invention.
[0032] Reference numbers
10 gas burner
12 support or flange
14 central gas inlet port
16 gas supply or mixing chamber
18 end cap
20 burner deck
22 perforated metal plate
24 perforation
30 perforation
Mode(s) for Carrying Out the Invention
[0033] Examples of a burner according to the present invention will be described with reference to Figures 1 to 1 1.
[0034] Figure 1 shows a gas burner 10, preferably a premix burner, comprising a support or flange 12 which has a central gas inlet port 14 for supply of gas into a gas supply or mixing chamber 16. The gas supply chamber 16 is enclosed by a perforated metal plate 22. The perforated metal plate 22 is connected at the bottom to the support or flange 12 through a base section. The perforations 24 in the perforated metal plate 22 provide the burner deck 20. The burner deck 20 has an overall porosity which is equal to or lower than 1 1 %, preferably lower than 10%, even more preferably lower than 9%.
[0035] Figure 2A shows a perspective view of a burner according to the present invention. Figure 2B shows a cross sectional view taken along the line II- ΙΓ in Figure 2A. Figures 2A and 2B shows a gas burner 10, preferably a premix burner, comprising a support or flange 12 which has a central gas inlet port 14 for supply of gas into a gas supply or mixing chamber 16. The gas supply chamber 16 is enclosed by a perforated metal plate 22 and an end cap 18 substantially opposite to said gas inlet port 14. The
perforations 24 in the perforated metal plate 22 provide the burner deck 20. The end cap 18 is connected to the top of the perforated metal plate 22 and the perforated metal plate 22 is connected at the bottom to the support or flange 18 through a base section. The burner deck 20 has an overall porosity which is equal to or lower than 1 1 %, preferably lower than 10%, even more preferably lower than 9%. In an exemplary embodiment, a burner 10, with a perforation pattern as shown in figure 2C, has a length of 102,4mm and diameter of 70,4mm. The burner deck has a length of 81 ,2 mm and has a porosity of 7,7%. The perforation pattern in the perforated plate is a combination of slits and round holes. For a thickness of the perforated plate of 0,6 mm, the slits being 4,0x0,5mm, the holes having a diameter of 0,8mm. The perforations are grouped in a pattern of 4,8 mm and this pattern is repeated over the burner deck in an equal division. As explained above, this burner still needed an anti-noise device, but no pressure divider or distributor anymore.
[0036] A further aspect of the present invention provides a burner 10 wherein the end cap 18 is also provided with perforations. Figure 3 shows an exemplary burner according to the present invention wherein the end cap is provided with perforations 30. The burner deck of this burner is as shown by reference number 20.
[0037] A further aspect of the present invention provides a burner 10 with a
burner deck wherein more than 50% of the burner deck has a porosity being equal to or lower than 9% and wherein 10 to 50% of the burner deck has a porosity being higher than 1 1 %. The burner deck has an overall porosity which is equal to or lower than 1 1 %. In an exemplary
embodiment, a burner 10 as shown in figure 4 has a length of 94,8mm and diameter of 70,4mm. The burner deck 20 has a length of 93,6mm. The perforation pattern in the perforated plate 22 is a combination of slits and round holes. The thickness of the perforated plate 22 is 0,6 mm, the slits being 4,0x0,5mm, the holes having a diameter of 0,8mm. The perforations are grouped in a pattern as shown in fig. 4, wherein the first 1 1 ,8mm of the burner deck length has a porosity of 15%, thereafter is a zone of 46,8mm of the burner deck length with a porosity of 7,3% and the last zone with a length of 5.8mm 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 which has an overall porosity of 9,8%. This modification of the perforation pattern of the burner deck provided a burner which, next to the effect of the deletion of the diffuser and the removal of the humming noise, also had a more stable response on the second and higher Helmholtz or instable acoustic resonances of the heat exchanger, which therefore made that the burner did not provoke a whistling sound anymore. Next to that, during start sequences under cold conditions, the humming sound was eliminated and therefore the use of anti-noise devices in the mixing chamber of the burner could be omitted. Furthermore, this provided a stabilized deck over the full operating range of high to low CO2's, and for a broad range of gas qualities. Furthermore, for this specific example of fig. 4, the use of the relatively high porosity at the beginning and end of the burner deck 20 provide an even more stable flame pattern of the burner.
[0038] An example embodiment according to a further aspect of the claimed
invention provides a gas burner with a perforated metal plate 22 with a perforation pattern as shown in fig. 5. The shown perforation pattern is repeated over the circumference of the burner. Here the burner deck 20 has different patterns of perforations. Adding more patterns with different pitches showed an increased stability for a broader range of gas qualities and induced less NOx-emissions. The exemplary perforation pattern of fig. 5 is an abrupt and stepwise variation of the perforation pattern in the burner deck 20.
[0039] Figure 6 shows another example of a perforation pattern of burner deck 20 according to a preferred aspect of the present invention, wherein the porosity of the burner deck 20 decreases stepwise in downstream direction. The shown perforation pattern is repeated in the perforated metal plate 22 over the circumference of the burner.
[0040] Figure 7 shows an example of a perforation pattern of burner deck 20 according to a preferred aspect of the present invention, wherein the porosity is gradually increasing. This perforation pattern is repeated in the perforated metal plate 22 over the circumference of the burner. [0041] Figure 8 shows an exemplary perforation pattern of the burner deck 20, which is repeated lengthwise over the perforated metal plate 22.
[0042] Figure 9 shows a further exemplary perforation pattern which is repeated on the circumference of a burner. The perforation pattern is such that no repeat of pattern is occurring along the length of the burner deck 20. An exemplary burner with a length of 91 ,2mm and diameter of 70,4mm. The burner deck has a length of 70,4mm. The perforation pattern in the perforated plate 22 is a combination of slits and round holes as shown in figure 9. For a thickness of the perforated plate 22 of 0,6 mm, the slits being 4, 0x0, 5mm, the holes having a diameter of 0,8mm, this burner deck has an overall porosity of 7.5%.
[0043] The person skilled in the art will acknowledge that any perforation pattern or set of perforation patterns can be repeated lengthwise or over the circumference to obtain the burner according to the present invention.
[0044] Another preferred embodiment of the present invention is shown in figure 10. The burner 10 made out of perforated metal plate 22 has a completely random perforated burner deck 20 with no repeatability over the full height or circumference of the burner deck which provides a stabilized deck without the additional devices as mentioned above.
[0045] Figure 1 1 shows another exemplary embodiment of the present invention.
This burner has a perforated end cap 24 with different perforation pattern than the perforated metal plate 22. The perforations 30 together with the perforations 24 provide the burner deck 20.
[0046] Thus there has been described a gas burner, preferably a premix burner, comprising a support which has a central gas inlet port for supply of gas into a gas supply chamber. The gas supply chamber is enclosed by a perforated metal plate and an end cap substantially opposite to said gas inlet port. The perforations in the perforated metal plate provide a burner deck. The end cap is connected to the top of the perforated metal plate and the perforated metal plate is connected at the bottom to the support through a base section. The burner deck has an overall porosity which is equal to or lower than 1 1 %. The present invention also provides use of this burner, e.g. in heat exchangers.

Claims

Claims
Claim 1. A gas burner (10), preferably a premix burner, comprising a support (12) having a central gas inlet port (14) for supply of gas into a gas supply chamber (16), said gas supply chamber (16) being enclosed by a perforated metal plate (22), said perforated metal plate (22) connected at the bottom to said support (12) through a base section, said perforation (24) in said perforated metal plate (22) providing a burner deck (20), characterised in that said burner deck (20) has an overall porosity being equal to or lower than 1 1 %.
Claim 2. A gas burner (10), as in claim 1 , said burner further comprising an end cap (18) substantially opposite to said gas inlet port (14), said end cap (18) being connected to said perforated metal plate (22).
Claim 3. A gas burner as in claim 2, wherein said end cap (18) is also
provided with perforations (30), said perforations (30) thereby enlarging said burner deck (20).
Claim 4. A gas burner as in any of the previous claims, wherein more than 50% of the burner deck has a porosity being equal to or lower than 9% and wherein upto 50% of the burner deck has a porosity being higher than 1 1 %.
Claim 5. A gas burner as in any of the previous claims, wherein said burner deck has different patterns of perforations.
Claim 6. Gas burner as in claim 5, wherein said burner deck has at least two different patterns of perforations.
Claim 7. Gas burner as in claim 5, wherein said burner deck has a gradually changing porosity.
Claim 8. Gas burner as in claim 5, wherein said burner deck (20) has a
substantially completely random porosity.
Claim 9. Use of the gas burner as in any of the preceding claims, in a heat exchanger.
Claim 10. Use of the gas burner as in any of the claims 1 to 8, in a furnace or air heater.
Claim 1 1. A gas burner (10), preferably a premix burner, comprising a support (12) having a central gas inlet port (14) for supply of gas into a gas supply chamber (16), said gas supply chamber (16) being enclosed by a perforated metal plate (22) thereby eliminating a gas diffuser between the gas inlet port (14) and the perforated metal plate (22), said perforated metal plate (22) connected at the bottom to said support (12) through a base section, said perforation (24) in said perforated metal plate (22) providing a burner deck (20), characterised in that said burner deck (20) has an overall porosity being equal to or lower than 1 1 %.
EP10782307.2A 2009-12-11 2010-11-26 Burner with low porosity burner deck Active EP2510281B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP17191076.3A EP3282187B1 (en) 2009-12-11 2010-11-26 Burner with low porosity burner deck
EP10782307.2A EP2510281B1 (en) 2009-12-11 2010-11-26 Burner with low porosity burner deck

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP09178982 2009-12-11
PCT/EP2010/068284 WO2011069839A1 (en) 2009-12-11 2010-11-26 Burner with low porosity burner deck
EP10782307.2A EP2510281B1 (en) 2009-12-11 2010-11-26 Burner with low porosity burner deck

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP17191076.3A Division EP3282187B1 (en) 2009-12-11 2010-11-26 Burner with low porosity burner deck
EP17191076.3A Division-Into EP3282187B1 (en) 2009-12-11 2010-11-26 Burner with low porosity burner deck

Publications (2)

Publication Number Publication Date
EP2510281A1 true EP2510281A1 (en) 2012-10-17
EP2510281B1 EP2510281B1 (en) 2017-10-25

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ID=42126102

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EP17191076.3A Active EP3282187B1 (en) 2009-12-11 2010-11-26 Burner with low porosity burner deck
EP10782307.2A Active EP2510281B1 (en) 2009-12-11 2010-11-26 Burner with low porosity burner deck

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Country Status (6)

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US (1) US20120193452A1 (en)
EP (2) EP3282187B1 (en)
JP (1) JP2013513774A (en)
KR (1) KR101817371B1 (en)
CN (1) CN102597624B (en)
WO (1) WO2011069839A1 (en)

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Also Published As

Publication number Publication date
CN102597624A (en) 2012-07-18
EP3282187B1 (en) 2019-04-10
CN102597624B (en) 2015-04-15
JP2013513774A (en) 2013-04-22
EP2510281B1 (en) 2017-10-25
US20120193452A1 (en) 2012-08-02
KR20120102691A (en) 2012-09-18
KR101817371B1 (en) 2018-01-11
EP3282187A1 (en) 2018-02-14
WO2011069839A1 (en) 2011-06-16

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