WO2023037277A1 - Plate gas burner with low pollutant emission - Google Patents

Plate gas burner with low pollutant emission Download PDF

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Publication number
WO2023037277A1
WO2023037277A1 PCT/IB2022/058450 IB2022058450W WO2023037277A1 WO 2023037277 A1 WO2023037277 A1 WO 2023037277A1 IB 2022058450 W IB2022058450 W IB 2022058450W WO 2023037277 A1 WO2023037277 A1 WO 2023037277A1
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WO
WIPO (PCT)
Prior art keywords
plate
diffuser
burner
sides
gas
Prior art date
Application number
PCT/IB2022/058450
Other languages
French (fr)
Inventor
Laura DALLA VECCHIA
Domenico Peserico
Pietro PAGLIARO
Valter CAVASSO
Original Assignee
Polidoro S.P.A.
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 Polidoro S.P.A. filed Critical Polidoro S.P.A.
Priority to CN202280060648.0A priority Critical patent/CN117916524A/en
Publication of WO2023037277A1 publication Critical patent/WO2023037277A1/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
    • 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
    • F23D14/045—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 a plurality of burner bars assembled together, e.g. in a grid-like arrangement
    • 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
    • F23D14/08—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 axial outlets at the burner head
    • F23D14/085—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 axial outlets at the burner head with injector axis inclined to the burner head axis
    • 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
    • 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
    • F23D2203/1026—Flame diffusing means using perforated plates with slotshaped openings

Definitions

  • the present invention relates to a plate gas burner according to the preamble of the main claim.
  • a known plate gas burner comprises a plurality of plate- like elements placed in parallel to each other and wherein generally a gas is mixed with air (primary air); such air/gas mixture flows along a conduct present in every plate-like element to reach an end of said plate-like element, where a diffuser is placed and where such mixture combines with secondary air to generate a flame activated by a usual ignition member.
  • This diffuser comprises a plurality of slots present all along its surface and from which a gas/air mixture goes out and in correspondence with which a flame forms.
  • such surface of the diffuser is flat.
  • Such gas burners of the above-mentioned type are used in gas-fired boilers since many years; they shall comply with more and more stringent regulations in terms of emissions of nitrogen oxides (NOx), which emissions are identified by their NOx concentration in the emitted fumes in mg/KWh.
  • NOx nitrogen oxides
  • boilers are classified into “NOx classes", featuring increasing figures as Nox emission (in mg/KWh) decreases.
  • NOx classes featuring increasing figures as Nox emission (in mg/KWh) decreases.
  • the present regulations require highest NOx classes in order to contain the environmental emissions generated by the operation of boilers.
  • the burner assembly mainly consists of a main body and decompression walls.
  • the main body is obtained by folding a metal plate. Therefore, such body is one-piece.
  • the main body has an upper face on which a primary flame is generated.
  • the main body of the burner includes two lateral walls communicating with the upper face and essentially folded by 90° with respect to such face.
  • the upper face of the burner has an elongated shape with an A-shaped cross section and includes a plurality of slots regularly arranged thereon.
  • Such upper face defines the gas diffuser of the main body of the burner, such diffuser being thus integral with such main body and being part thereof.
  • the air passage members too comprise a body which is obtained by folding a plate. Therefore, every air passage member is one-piece.
  • Such member features a spine-shaped extremal portion with tilted surfaces and includes a number of slots to allow for air passage.
  • document US2007/251467 does not present a diffuser implemented as an autonomous (but constrained) part of the main body of the burner, and also the air passage members include extremal portions integral with the remaining part of its corresponding air passage member.
  • EP1130315 discloses a burner having a plurality of burner elements put side by side. Every burner element includes an extremal burner plate, which is a dome-shaped or flat one.
  • the European text does not describe that the burner plate can be shaped like a spine nor that its position on the mixer body can be adjusted.
  • An object of the present invention is to provide a plate gas burner that is improved with respect to the plate gas burners according to the present status of the art and, in particular, offers very moderate NOx emission values during its operation.
  • Another object is to offer a gas burner of the above- mentioned type that has a reduced CO emission as compared to similar burners, the output thermal power being equal, in particular a CO emission value, as obtained during a flame lift-off test, that is lower than those of the burners according to the present status of the art (test conditions being equal).
  • Another object is to offer a gas burner of the above- mentioned type whose implementation does not require any special modifications of the production operations already used for the plate gas burners according to the present status of the art.
  • Figure 1 is a top perspective view of an embodiment of a burner according to the invention.
  • Figure 2 is a side view of a plate-like element of the burner shown in figure 1;
  • Figure 3 is a cross sectional view according to line 3- 3 in figure 2;
  • Figure 4 is an enlarged view of the part identified by A in figure 3;
  • Figure 5 is a cross sectional view according to line 5- 5 in figure 1;
  • Figures 6A thru 6E show top views of a plurality of embodiments of a part of the burner of figure 1;
  • Figure 7 shows a table with the quantitative results resulting from "spine-shaped” burners obtained according to the invention and from burners according to the status of the art ("flat burners").
  • a plate gas burner is generically identified by 1 and comprises a body 2 defined by a union of a plurality of plate-like elements, or simply plates 3 comprising a box-shaped body 4 and arranged with their median longitudinal planes P parallel to each other (see figures 1 and 5, where some planes P only are shown).
  • every box-shaped body 4 of the plates 3 includes a tubular duct 6, folded and shaped in such a way as to get an essentially U-like shape turned by 90°; hence, the tubular duct 6 includes two arms 7 and 8 which are essentially parallel to each other. More specifically, the first arm 7 includes an opening or end 7A which the gas coming from a usual gas feeder (not shown) goes in. Close to such opening 7A there is a known Venturi tube which sucks air from the external within the duct 6.
  • the second arm 8 is connected to a flame diffuser 10 of the plate 3, from which the flame of the burner generates; such diffuser 10 comprises a surface 11 having a plurality of slots 12, which the gas and the air present in the duct 6 go out, so as to allow for generation of a flame in correspondence with and above the surface 11, thanks to this air-gas mixture being ignited through a usual igniter present above the diffusers of the plates 3.
  • the plates 3 are constrained to each other by support stirrups 13 and 14.
  • the surface 11 of the diffuser 10 associated with every plate 3 is spine-shaped; such surface comprises two sides 16 and 17 tilted each with respect to the other and converging to a common linear zone or line 18 present in the surface 11. Consequently, the latter is not flat, but rather it has a triangular or essentially triangular cross section: as a matter of fact, the sides 16 and 17 might be rectilinear, as shown in figure 4, but they might also be curvilinear, for example with their concavity facing outwards of the body 4 of the plate, but, in any case, connecting to each other in such a way as to form a spine.
  • Openings 12 of the surface 11 of the diffuser are cut in sides 16 and 17: in the embodiment of figure 1, such slots 12 are rectilinear (orthogonal to the line or spine 18 of the surface 11) and are equally spaced from each other. In a way known by itself, however, the openings 12 might even have lengths different from each other, or be arranged in groups that longitudinally repeat on the surface 11: figures 6A thru 6E show top views of the surfaces 11 with openings 12 having a variety of shapes and arrangements.
  • the diffuser 10 is defined by a body 20 placed above ends 21 of elements 22 and 23 put one aside the other and mutually secured together (in a known way) which define the body 4 of the plate 3 and the two arms 7 and 8 of the duct 6, by way of localized deformations.
  • Such body 20 is secured to the elements 22 and 23 in a way that is known by itself (for instance, by welding or crimping, i.e. by way of a "squeezing" applied both to the ends 21 of the plate and to the body 20).
  • the diffuser moves on a rail (not shown) applied in the two respective elements 22 and 23.
  • the body 20 includes in a cross section (see figure 4), two arms 25 and 26, opposed to and spaced from each other, folded at their free ends 25A and 26A. Such arms continue uninterruptedly and terminate in sides 16 and 17 defining a spine on the surface 11 and converging in the common line (or zone or spine) 18.
  • the sides 16 and 17 form an angle ⁇ between each other, having a value which ranges from 45° to 130°, advantageously from 50° to 125°, and preferably from 54° to 117°.
  • the length of the flame that is generated on the surface 11 is shorter than that of the flame that is generated on a flat surface, which allows to stop gas combustion close to the surface 11, thus preventing the flame from cooling down far away from such surface and minimizing formation of fumes and CO.
  • Tests have been carried out with burners implemented with a diffuser having an emission surface of a flat shape and a burner implemented according to the present invention. These tests have been carried out by using different types of burners with different configurations and distributions of the slots in the surface of the diffuser (which is indicated in the following table, by the numeric value in the column "HEAD").
  • the tables specify the presence (or not) of a spine on the surface of the diffuser, the diameter of the nozzles, the NOx emissions, the CO emissions with the use of methane gas (G20), and the CO emissions during a "flame lift-off" test performed by using the known gas G23.
  • the table of figure 7 relates to a test where also the ratio of primary air to gas injected in the burner (indicated by "lambda”) is also considered, as well as the ratio of percentage generation of CO2 to the total of the emitted fumes.
  • Two values are considered for lambda, namely 1.1 and 1.3, and the emissions of CO and NOx are assessed for them, the surface temperature of the diffuser of the burner, and those of the primary air/gas mixture and the secondary air being equal.
  • the present invention makes it possible a considerable overall reduction of polluting gases as a result of a changed geometry of the surface of the flame diffuser of every plate of the burner.

Abstract

A plate gas burner (1) for a boiler comprising a plurality of plates (3) placed in parallel to each other and defining altogether a body (2) of the burner, every plate (3) presenting a diffuser (10) on the surface of which a flame is formed. The diffuser (10) comprises a body (20) placed above its corresponding plate, the surface (11) of the diffuser being spine-shaped.

Description

PLATE GAS BURNER WITH LOW POLLUTANT EMISSION
The present invention relates to a plate gas burner according to the preamble of the main claim.
A known plate gas burner comprises a plurality of plate- like elements placed in parallel to each other and wherein generally a gas is mixed with air (primary air); such air/gas mixture flows along a conduct present in every plate-like element to reach an end of said plate-like element, where a diffuser is placed and where such mixture combines with secondary air to generate a flame activated by a usual ignition member. This diffuser comprises a plurality of slots present all along its surface and from which a gas/air mixture goes out and in correspondence with which a flame forms.
Usually, such surface of the diffuser is flat.
Such gas burners of the above-mentioned type are used in gas-fired boilers since many years; they shall comply with more and more stringent regulations in terms of emissions of nitrogen oxides (NOx), which emissions are identified by their NOx concentration in the emitted fumes in mg/KWh. Depending on their emissions, boilers are classified into "NOx classes", featuring increasing figures as Nox emission (in mg/KWh) decreases. The present regulations require highest NOx classes in order to contain the environmental emissions generated by the operation of boilers.
Likewise, also for the emissions of carbon monoxide, or CO, at the minimum power level, the emission of such gas is assessed by way of a well-known test called "flame lift-off test" which indicates the "strength of a burner against flame lift-off" or its capability of not extinguishing whenever the heating capacity reaches a value lower than the minimum operating power of a burner. Document US2007/251467 discloses a combustion apparatus comprising a pre-mixer, a burner assembly, and two air passage members. The pre-mixer and the burner assembly are engaged with each other in such a way as to define an intermediate member which is arranged between the two air passage members.
The burner assembly mainly consists of a main body and decompression walls. The main body is obtained by folding a metal plate. Therefore, such body is one-piece.
The main body has an upper face on which a primary flame is generated. The main body of the burner includes two lateral walls communicating with the upper face and essentially folded by 90° with respect to such face.
The upper face of the burner has an elongated shape with an A-shaped cross section and includes a plurality of slots regularly arranged thereon.
Such upper face defines the gas diffuser of the main body of the burner, such diffuser being thus integral with such main body and being part thereof.
The air passage members too comprise a body which is obtained by folding a plate. Therefore, every air passage member is one-piece. Such member features a spine-shaped extremal portion with tilted surfaces and includes a number of slots to allow for air passage.
Therefore, document US2007/251467 does not present a diffuser implemented as an autonomous (but constrained) part of the main body of the burner, and also the air passage members include extremal portions integral with the remaining part of its corresponding air passage member.
EP1130315 discloses a burner having a plurality of burner elements put side by side. Every burner element includes an extremal burner plate, which is a dome-shaped or flat one.
The introduction of this document describes that such plate is constrained to a mixer body of the burner as a plug placed on the latter.
The European text does not describe that the burner plate can be shaped like a spine nor that its position on the mixer body can be adjusted.
An object of the present invention is to provide a plate gas burner that is improved with respect to the plate gas burners according to the present status of the art and, in particular, offers very moderate NOx emission values during its operation.
Another object is to offer a gas burner of the above- mentioned type that has a reduced CO emission as compared to similar burners, the output thermal power being equal, in particular a CO emission value, as obtained during a flame lift-off test, that is lower than those of the burners according to the present status of the art (test conditions being equal).
Another object is to offer a gas burner of the above- mentioned type whose implementation does not require any special modifications of the production operations already used for the plate gas burners according to the present status of the art.
These and other objects that will be apparent to those skilled in the art are achieved by a plate gas burner according to the attached claims.
For a better understanding of the present invention, the following drawings are attached hereto for exemplary, non- limitative purposes only, wherein:
Figure 1 is a top perspective view of an embodiment of a burner according to the invention;
Figure 2 is a side view of a plate-like element of the burner shown in figure 1;
Figure 3 is a cross sectional view according to line 3- 3 in figure 2;
Figure 4 is an enlarged view of the part identified by A in figure 3;
Figure 5 is a cross sectional view according to line 5- 5 in figure 1;
Figures 6A thru 6E show top views of a plurality of embodiments of a part of the burner of figure 1; and
Figure 7 shows a table with the quantitative results resulting from "spine-shaped" burners obtained according to the invention and from burners according to the status of the art ("flat burners").
With reference to the mentioned figures, a plate gas burner is generically identified by 1 and comprises a body 2 defined by a union of a plurality of plate-like elements, or simply plates 3 comprising a box-shaped body 4 and arranged with their median longitudinal planes P parallel to each other (see figures 1 and 5, where some planes P only are shown).
In a known way, every box-shaped body 4 of the plates 3 includes a tubular duct 6, folded and shaped in such a way as to get an essentially U-like shape turned by 90°; hence, the tubular duct 6 includes two arms 7 and 8 which are essentially parallel to each other. More specifically, the first arm 7 includes an opening or end 7A which the gas coming from a usual gas feeder (not shown) goes in. Close to such opening 7A there is a known Venturi tube which sucks air from the external within the duct 6. The second arm 8 is connected to a flame diffuser 10 of the plate 3, from which the flame of the burner generates; such diffuser 10 comprises a surface 11 having a plurality of slots 12, which the gas and the air present in the duct 6 go out, so as to allow for generation of a flame in correspondence with and above the surface 11, thanks to this air-gas mixture being ignited through a usual igniter present above the diffusers of the plates 3.
The plates 3 are constrained to each other by support stirrups 13 and 14.
The surface 11 of the diffuser 10 associated with every plate 3 is spine-shaped; such surface comprises two sides 16 and 17 tilted each with respect to the other and converging to a common linear zone or line 18 present in the surface 11. Consequently, the latter is not flat, but rather it has a triangular or essentially triangular cross section: as a matter of fact, the sides 16 and 17 might be rectilinear, as shown in figure 4, but they might also be curvilinear, for example with their concavity facing outwards of the body 4 of the plate, but, in any case, connecting to each other in such a way as to form a spine.
Openings 12 of the surface 11 of the diffuser are cut in sides 16 and 17: in the embodiment of figure 1, such slots 12 are rectilinear (orthogonal to the line or spine 18 of the surface 11) and are equally spaced from each other. In a way known by itself, however, the openings 12 might even have lengths different from each other, or be arranged in groups that longitudinally repeat on the surface 11: figures 6A thru 6E show top views of the surfaces 11 with openings 12 having a variety of shapes and arrangements.
Note that the diffuser 10 is defined by a body 20 placed above ends 21 of elements 22 and 23 put one aside the other and mutually secured together (in a known way) which define the body 4 of the plate 3 and the two arms 7 and 8 of the duct 6, by way of localized deformations. Such body 20 is secured to the elements 22 and 23 in a way that is known by itself (for instance, by welding or crimping, i.e. by way of a "squeezing" applied both to the ends 21 of the plate and to the body 20). Preferably, all along the length of each single plate 3, the diffuser moves on a rail (not shown) applied in the two respective elements 22 and 23.
The body 20 includes in a cross section (see figure 4), two arms 25 and 26, opposed to and spaced from each other, folded at their free ends 25A and 26A. Such arms continue uninterruptedly and terminate in sides 16 and 17 defining a spine on the surface 11 and converging in the common line (or zone or spine) 18.
The sides 16 and 17 form an angle α between each other, having a value which ranges from 45° to 130°, advantageously from 50° to 125°, and preferably from 54° to 117°.
The body 20, which is autonomous with respect to each corresponding plate 3, i.e. is not an integral part of such plate, can be put on the elements 22 and 23 and secured thereto in such a way that the line (or spine) 18 can be cut at a distance (height) from the ends of such elements (covered by the body 20) in a range from 2 to 5 mm according to the used gas. A possibility exists of adjusting such distance, which allows to optimize the generation of a flame on the diffuser 10, while containing the emissions of NOx and the generation of CO both during a flame lift-off test and during a normal operation of the burner in a boiler. As a matter of fact, it has been surprisingly found, from tests performed by this Applicant, that, by using the abovedescribed solution, the length of the flame that is generated on the surface 11 is shorter than that of the flame that is generated on a flat surface, which allows to stop gas combustion close to the surface 11, thus preventing the flame from cooling down far away from such surface and minimizing formation of fumes and CO.
Tests have been carried out with burners implemented with a diffuser having an emission surface of a flat shape and a burner implemented according to the present invention. These tests have been carried out by using different types of burners with different configurations and distributions of the slots in the surface of the diffuser (which is indicated in the following table, by the numeric value in the column "HEAD").
The results of these tests are summarized below
Figure imgf000008_0001
Figure imgf000008_0002
Figure imgf000009_0001
Figure imgf000009_0002
The tables specify the presence (or not) of a spine on the surface of the diffuser, the diameter of the nozzles, the NOx emissions, the CO emissions with the use of methane gas (G20), and the CO emissions during a "flame lift-off" test performed by using the known gas G23.
As shown in the table, the use of this invention leads to a considerable percentage decrease (from a little bit less than 10% up to 20% and more) of CO emission, both in a test step and in one whereby methane gas was fed (always at the minimum heating capacity Qmin). Notwithstanding such considerable decrease of CO (which usually entails an as much considerable percentage increase of NOx), the NOx emission rate just increases but only few percentage units.
This leads to obvious advantages in terms of respect for the environment, but also to advantages in terms of the "regulatory" class (high) in which a burner can be classified.
On the other hand, the table of figure 7 relates to a test where also the ratio of primary air to gas injected in the burner (indicated by "lambda") is also considered, as well as the ratio of percentage generation of CO2 to the total of the emitted fumes. Two values are considered for lambda, namely 1.1 and 1.3, and the emissions of CO and NOx are assessed for them, the surface temperature of the diffuser of the burner, and those of the primary air/gas mixture and the secondary air being equal.
As shown in the table of figure 7, in identical conditions of use of burners fed with methane gas, the value of NOx remains essentially constant, notwithstanding there is a substantial decrease of CO (contrary to what the skilled person might expect).
Therefore, the present invention makes it possible a considerable overall reduction of polluting gases as a result of a changed geometry of the surface of the flame diffuser of every plate of the burner.
A specific embodiment of the invention has been described. However, the skilled person might implement other configurations of the burner while remaining in the scope of protection of this invention as set forth in the following claims.

Claims

1. A plate gas burner (1) for a boiler comprising a plurality of plates (3) placed parallel to each other and defining altogether a body (2) of the burner, every plate (3) including an inner duct (6) having a first part (7) which receives gas from a gas feeder and a second part (8) connected to a diffuser (10) of the plate on the surface (11) of which a flame is generated, characterized in that the surface (11) of the diffuser (10) of the plate is spineshaped and comprises two sides (16, 17) which converge to and join together in a common line (18), the diffuser (10) being defined by a body (20) put on ends of plate elements (22, 23), placed side by side and secured to each other, defining a body (4) of the plate and the inner duct (6) of the latter, said body (20) of the diffuser being secured to such plate elements (22, 23) and comprising said converging sides (16, 17) of the surface (11) of the diffuser, the body (20) of the diffuser being secured to said plate elements (22, 23) in such a way that the line (18) joining such sides (16, 17) is at a distance ranging from 2 to 5 mm from said ends of said plate elements (22, 23).
2. The plate gas burner according to claim 1, characterized in that the body (20) provided with the converging sides (16, 17) comprises opposing and spaced away arms (25, 26) terminating in said sides (16, 17) and directly secured to the plate elements (22, 23).
3. The plate gas burner according to claim 1, characterized in that said sides (16, 17) of the surface (11) of the diffuser (10) are rectilinear.
4. The plate gas burner according to claim 2, characterized in that said sides (16, 17) converging to the common line (18) form an angle (α) ranging from 45° to 130°, advantageously from 50° to 125° and preferably from 54° to 117°.
5. The plate gas burner according to claim 1, characterized in that said sides (16, 17) of the surface (11) of the diffuser (10) are curvilinear and converge to and join in the common line so that said surface is spine- shaped.
PCT/IB2022/058450 2021-09-09 2022-09-08 Plate gas burner with low pollutant emission WO2023037277A1 (en)

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IT102021000023330 2021-09-09
IT102021000023330A IT202100023330A1 (en) 2021-09-09 2021-09-09 PLATE GAS BURNER WITH LOW EMISSION OF POLLUTANTS

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1130315A2 (en) * 2000-03-04 2001-09-05 Robert Bosch Gmbh Atmospheric gas burner
US20070251467A1 (en) * 2006-04-27 2007-11-01 Noritz Corporation Combustion apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT241746Y1 (en) * 1996-02-26 2001-05-17 Finpolidoro Srl Ora Indus Poli COMBUSTIBLE GAS ATMOSPHERIC BURNER, OF THE "RAMPETTE" TYPE.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1130315A2 (en) * 2000-03-04 2001-09-05 Robert Bosch Gmbh Atmospheric gas burner
US20070251467A1 (en) * 2006-04-27 2007-11-01 Noritz Corporation Combustion apparatus

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