CA2056492A1 - Low no x gas burner - Google Patents
Low no x gas burnerInfo
- Publication number
- CA2056492A1 CA2056492A1 CA 2056492 CA2056492A CA2056492A1 CA 2056492 A1 CA2056492 A1 CA 2056492A1 CA 2056492 CA2056492 CA 2056492 CA 2056492 A CA2056492 A CA 2056492A CA 2056492 A1 CA2056492 A1 CA 2056492A1
- Authority
- CA
- Canada
- Prior art keywords
- burner
- plates
- gas
- burner tube
- tube
- 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.)
- Abandoned
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 abstract description 16
- 239000000567 combustion gas Substances 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- F23D14/46—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
- 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
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2203/00—Flame cooling methods otherwise than by staging or recirculation
- F23C2203/20—Flame cooling methods otherwise than by staging or recirculation using heat absorbing device in flame
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Abstract
Title: Low NOx gas burner ABSTRACT
A low NOx atmospheric gas burner comprising at least one burner tube having a plurality of gas outlet orifices terminating in a burner bed. A plurality of plates are arranged above the burner tube within the reach of the flame.
These plates lower the temperature, effect a stepped combustion, are arranged parallel to and on opposite sides of the orifices provided in the burner tube and are connected direct to the burner tube substantially throughout their lower ends. At least one of the upper ends of the plates is bent outwards, which leads to improved cooling, improved mixing of combustion gas and secondary air and hence to improved combustion.
A low NOx atmospheric gas burner comprising at least one burner tube having a plurality of gas outlet orifices terminating in a burner bed. A plurality of plates are arranged above the burner tube within the reach of the flame.
These plates lower the temperature, effect a stepped combustion, are arranged parallel to and on opposite sides of the orifices provided in the burner tube and are connected direct to the burner tube substantially throughout their lower ends. At least one of the upper ends of the plates is bent outwards, which leads to improved cooling, improved mixing of combustion gas and secondary air and hence to improved combustion.
Description
20~92 Title: Low NOX gas burner This invention relates to a low NOX atmospheric gas burner comprising at least one burner tube having a plurality of gas outlet orifices terminating in a buxner bed, while a plurality of plates are arranged above the burner tube within the reach of the flame, which plates lower the -temperature, effect a stepped combustion, are arranged parallel to and on opposite sides of the orifices provided in the burner tube and disposed in line parallel to the burner axis, and are connected direct to the burner tube substantially throughout their lower ends.
The ob~ect of khe present invention is to improve such a burner known from Netherlands patent application 8900030.
To that end, the burner according to the invention is characterized in that at least one of the upper ends of the - plates is bent outwards.
~ 15 The advantage achieved with this feature is not only that .
the NOX content 1s reduced further as a result of improved cooling, but also that better combustion is obtained as~a result of improved mixing of the combustion gas and the secondary air supplied owing to the greater turbulence caused in the converging passage between widening pairs of plates, the result being a more stable flame.
Further, by bending the *ree upper edges of the plates inwards, a local reduced pressure is created, so that greater flame stability is achieved.
20~6~92 To clarify the invention, some embodiments of the gas burner will now be described, by way of example, with reference to the accompanying drawings, in which. -Fig. 1 is a diagrammatic side elevation of a gas burner5 according to the invention;
Fig. 2 is a top plan view of the apparatus according to the invention as shown in Fig. l;
Fig. 3 is a ].eft-hand side elevation of the apparatus according to Fig. 1;
Fig. 4 is a right-hand side elevation of the apparatus according to Fig. 1;
Fig. 4A is a variant of the apparatus according to Fig. 4;
; and Fig. 5 is a burner block comprising four burner tubes as shown in Figs 1-4.
According to the drawings, a low NOX atmospheric gas burner comprises a burner tube 1, the inlet portion of which constitutes a mixing tube portion 2 connecting to a diffuser portion 3. The burner tube 1 proper comprises a bottom 4 and a constriction portion 5 opposite therefrom. Extending between these portions is a dlstributor plate 6. Extending upwards from this burner tube part is a narrowing portion 7 at the top of which are arranged gas outlet orifices consisting of flat strips (not shown) together forming a burner bed. Extending upwards from the~walls forming said narrowing portion are two conically flaring plates 8, which lower the temperature and promote a stepped combustion. As will appear from the drawing, 2~5~2 the straight and corrugated strips can be supported not only at their ends but also in the middle by means of a support 9.
To ensure proper transfer of the flame upon ignition of the gas burner, apertures 12 are provided in the plates 8.
To improve flame stability, small, regularly spaced air supply holes 10 are provided in the plates 8.
The tapering configuration of the burner tube walls connecting to the bottom 4 (shown in Fig. 3) ensures that the sound produced by the burner will be damped in the burner tube and not be so reflected that the sound vibrations just produced would be amplified.
As will appear from Figs 1, 4 r and 4A, the mixing tube portion comprises at its free end two fastening flanges ll to be connected ~o a gas supply pipe. It is noted that the distance H (indicated in Fig. 1~ from the cross section of equal width up to the top of the burner bed should be so large as to ensure a straight flow of the co~bustion gas mixture to the burner orifices. This ensures a straight flow of the gas-air mixture to the burner bed and hence a uniform flame height and hence a mi~imal sound production.
; In the variant of the apparatus according to Fig. 4 shown in Fig. 4A, the free edge of the plates 8 is provided with an inward flanged portion 18 which brings about a reduced pressure at that point in the passing gas mixture flow, which leads to greater flame stability.
The embodiment shown in Fig. 5 shows a burner block 17 arranged in a furnace space 15 enclosed by a wall 16. The 20~64~2 burner block 17 comprises four burner tubes 1 such as shown in Figs 1-4A in side-by-side arrangement. This construction ensures a minimal NOx content in the exhaust gas, the conical configuration of the plates 8 leading to an eminent mixing of the combus~ion gas passing from the burner tube between the plates 8 and the secondary air supplied externally along the plates. Partly as a consequence of the fact that the cross~
section between the plates 8 of each burner increases in the direction of discharge, the speed of the passing combustion gas will decrease, which effects not onLy a better mixture but also a better flame stability.
For the sake of completeness it is observed that instead of a burner bed formed by plane and corrugated plates or strips, a burner bed of ceramic material as is known per se in the art can also be used.
::
~ It will be clear that within the concept of the invention ;~ ; further modifications are possible.
:~ :
'~
:~ :
~:: :
The ob~ect of khe present invention is to improve such a burner known from Netherlands patent application 8900030.
To that end, the burner according to the invention is characterized in that at least one of the upper ends of the - plates is bent outwards.
~ 15 The advantage achieved with this feature is not only that .
the NOX content 1s reduced further as a result of improved cooling, but also that better combustion is obtained as~a result of improved mixing of the combustion gas and the secondary air supplied owing to the greater turbulence caused in the converging passage between widening pairs of plates, the result being a more stable flame.
Further, by bending the *ree upper edges of the plates inwards, a local reduced pressure is created, so that greater flame stability is achieved.
20~6~92 To clarify the invention, some embodiments of the gas burner will now be described, by way of example, with reference to the accompanying drawings, in which. -Fig. 1 is a diagrammatic side elevation of a gas burner5 according to the invention;
Fig. 2 is a top plan view of the apparatus according to the invention as shown in Fig. l;
Fig. 3 is a ].eft-hand side elevation of the apparatus according to Fig. 1;
Fig. 4 is a right-hand side elevation of the apparatus according to Fig. 1;
Fig. 4A is a variant of the apparatus according to Fig. 4;
; and Fig. 5 is a burner block comprising four burner tubes as shown in Figs 1-4.
According to the drawings, a low NOX atmospheric gas burner comprises a burner tube 1, the inlet portion of which constitutes a mixing tube portion 2 connecting to a diffuser portion 3. The burner tube 1 proper comprises a bottom 4 and a constriction portion 5 opposite therefrom. Extending between these portions is a dlstributor plate 6. Extending upwards from this burner tube part is a narrowing portion 7 at the top of which are arranged gas outlet orifices consisting of flat strips (not shown) together forming a burner bed. Extending upwards from the~walls forming said narrowing portion are two conically flaring plates 8, which lower the temperature and promote a stepped combustion. As will appear from the drawing, 2~5~2 the straight and corrugated strips can be supported not only at their ends but also in the middle by means of a support 9.
To ensure proper transfer of the flame upon ignition of the gas burner, apertures 12 are provided in the plates 8.
To improve flame stability, small, regularly spaced air supply holes 10 are provided in the plates 8.
The tapering configuration of the burner tube walls connecting to the bottom 4 (shown in Fig. 3) ensures that the sound produced by the burner will be damped in the burner tube and not be so reflected that the sound vibrations just produced would be amplified.
As will appear from Figs 1, 4 r and 4A, the mixing tube portion comprises at its free end two fastening flanges ll to be connected ~o a gas supply pipe. It is noted that the distance H (indicated in Fig. 1~ from the cross section of equal width up to the top of the burner bed should be so large as to ensure a straight flow of the co~bustion gas mixture to the burner orifices. This ensures a straight flow of the gas-air mixture to the burner bed and hence a uniform flame height and hence a mi~imal sound production.
; In the variant of the apparatus according to Fig. 4 shown in Fig. 4A, the free edge of the plates 8 is provided with an inward flanged portion 18 which brings about a reduced pressure at that point in the passing gas mixture flow, which leads to greater flame stability.
The embodiment shown in Fig. 5 shows a burner block 17 arranged in a furnace space 15 enclosed by a wall 16. The 20~64~2 burner block 17 comprises four burner tubes 1 such as shown in Figs 1-4A in side-by-side arrangement. This construction ensures a minimal NOx content in the exhaust gas, the conical configuration of the plates 8 leading to an eminent mixing of the combus~ion gas passing from the burner tube between the plates 8 and the secondary air supplied externally along the plates. Partly as a consequence of the fact that the cross~
section between the plates 8 of each burner increases in the direction of discharge, the speed of the passing combustion gas will decrease, which effects not onLy a better mixture but also a better flame stability.
For the sake of completeness it is observed that instead of a burner bed formed by plane and corrugated plates or strips, a burner bed of ceramic material as is known per se in the art can also be used.
::
~ It will be clear that within the concept of the invention ;~ ; further modifications are possible.
:~ :
'~
:~ :
~:: :
Claims (5)
1. A low NOx atmospheric gas burner comprising at least one burner tube having a plurality of gas outlet orifices terminating in a burner bed, while a plurality of plates are arranged above the burner tube within the reach of the flame, which plates lower the temperature, effect a stepped combustion, are arranged parallel to and on opposite sides of the orifices provided in the burner tube and disposed in line parallel to the burner axis, and are connected direct to the burner tube substantially throughout their lower ends, characterized in that at least one of the upper ends of the plates is bent outwards.
2. A gas burner according to claim 1, characterized in that at least one of a pair of plates widens conically relative to the other plate.
3. A gas burner according to claim 1 or 2, characterized in that both plates widen conically.
4. A gas burner according to claim 1, 2 or 3, characterized by a plurality of burner tubes arranged side by side in a burner bed.
5. A gas burner according to one or more of the preceding claims, characterized in that the free upper edges of the plates are flanged inwards.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL9002626A NL9002626A (en) | 1990-11-30 | 1990-11-30 | NOX-LOW GAS BURNER. |
| NL9002626 | 1990-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2056492A1 true CA2056492A1 (en) | 1992-05-31 |
Family
ID=19858062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2056492 Abandoned CA2056492A1 (en) | 1990-11-30 | 1991-11-28 | Low no x gas burner |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0488481A1 (en) |
| CA (1) | CA2056492A1 (en) |
| NL (1) | NL9002626A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5645413A (en) * | 1995-01-20 | 1997-07-08 | Gas Research Institute | Low NOx staged-air combustion chambers |
| US10281173B2 (en) | 2012-06-28 | 2019-05-07 | Purpose Co., Ltd. | Burner, combustion apparatus, method for combustion, method for controlling combustion, recording medium, and water heater |
| JP6043521B2 (en) * | 2012-06-28 | 2016-12-14 | パーパス株式会社 | Combustion device, combustion method, and hot water supply device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU3802368A (en) * | 1969-05-20 | 1970-12-03 | Radiation (Australia) Proprietary Limited | Conversion apparatus |
| DE8604053U1 (en) * | 1986-02-13 | 1986-04-03 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Premix gas burner |
| US4767319A (en) * | 1987-03-27 | 1988-08-30 | Coen Company | Duct burner |
| NL8900030A (en) * | 1989-01-06 | 1990-08-01 | Remeha Fabrieken Bv | NOX-POOR ATMOSPHERIC GAS BURNER. |
| DE8914576U1 (en) * | 1989-12-12 | 1990-02-15 | Gaswärme-Institut eV, 4300 Essen | Burner with a burner tube for burning a mixture of fuel and primary air |
| DE9010640U1 (en) * | 1990-07-16 | 1990-09-20 | Buderus Heiztechnik GmbH, 6330 Wetzlar | Atmospheric gas burner |
-
1990
- 1990-11-30 NL NL9002626A patent/NL9002626A/en not_active Application Discontinuation
-
1991
- 1991-11-28 CA CA 2056492 patent/CA2056492A1/en not_active Abandoned
- 1991-11-29 EP EP91203140A patent/EP0488481A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| NL9002626A (en) | 1992-06-16 |
| EP0488481A1 (en) | 1992-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |