CA1294531C - Mounting-hole burner with counter-rotating air feeds - Google Patents
Mounting-hole burner with counter-rotating air feedsInfo
- Publication number
- CA1294531C CA1294531C CA000568826A CA568826A CA1294531C CA 1294531 C CA1294531 C CA 1294531C CA 000568826 A CA000568826 A CA 000568826A CA 568826 A CA568826 A CA 568826A CA 1294531 C CA1294531 C CA 1294531C
- Authority
- CA
- Canada
- Prior art keywords
- chamber
- gas
- air
- combustion
- feed
- 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.)
- Expired - Lifetime
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
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
-
- 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
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
- F23D14/24—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other at least one of the fluids being submitted to a swirling motion
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A mounting-hole burner comprising a chamber for the admission and combustion of a mixture of gas and air. The chamber comprises at least three areas of air feed planes which are offset along the centre line axis of the chamber. The air feeds are arranged in tangential counter-rotating relationship from one plane to another one.
A mounting-hole burner comprising a chamber for the admission and combustion of a mixture of gas and air. The chamber comprises at least three areas of air feed planes which are offset along the centre line axis of the chamber. The air feeds are arranged in tangential counter-rotating relationship from one plane to another one.
Description
?':~531 The present invention relates to a mounting-hole burner comprising a chamber for the ingress and the combustion of a mixture of a combustible gas or gaseous fuel with air and a chamber in axial extension of the mixing chamber, the chambers comprising substantially cylindrical walls and the air supply inlets being provided in at least two axially spaced planes extending at right angles to the centre line axis of the mixing and combustion chamber and which extend in substantially tangential relation to the cylindrical wall and in 10 counter-rotating relationship.
In the known burners of this kind, both air feed planes are very close to each other, thereby inducing a strong combustion with a very high rate of production of nitrogen oxides.
The object of the present invention is to cope with such an inconvenience and to provide a burner which does no longer suffer of the substantial drawback just referred to.
To reach that goal, the burner according to the invention is characterized in that at least three areas of air feed planes 20 are provided which are offset or staggered along the centre line axis of the chamber so as to produce a combustion in steps or stages for reducing the rate of production of nitrogen oxides.
According to an advantageous characterizing feature of the invention, the air feeds located in a first area of feed planes close to the gas feed level are adapted to provide for an incomplete and not very strong combustion, the air feeds located in the second area of feed planes are adapted to accelerate the combustion without the air-to-gas ratio reaching the stoechiometric value whereas the air feeds in the third area are 30 adapted to terminate the combustion.
According to another advantageous characterizing feature of the invention, both first air feed areas comprise each one two air feed planes with a tangential orientation in counter-rotating relationship from one plane to the other one.
According to a further characterizing feature of the 3~
invention, the means for feeding gas into the combustion chamber consist of radial holes or ports extending through the wall of the mixing and combustion chamber, this chamber being surrounded by two separate chambers for the intakes of air and gas, respectively.
According to another advantageous characterizing feature of the invention, the gas feed means consist essentially of a gas feed duct extending into the combustion chamber advantageously along the centre line axis thereof through a 10 closure wall of the chamber at the end opposite to the outlet thereof and which comprises at said first air feed plane means for exhausting the gas into the chamber, a device for igniting the gas issuing from the tube being provided near its oulets.
The invention will be better understood and further objects, characterizing features, details and advantages thereof will appear more clearly as the following explanatory description proceeds with reference to the accompanying diagrammatic drawings given by way of non-limiting examples only illustrating several presently preferred specific embodiments of 20 the invention and wherein :
- Figure 1 is a view in axial section of a burner according to the present invention;
- Figure 2 shows an axial section of a tube adapted to form a mixing and combustion chamber intended to fit a burner according to Figure 1 but designed according to an alternative embodiment; and - Figures 3 and 4 are views in axial section of a burner according to the invention showing two other embodiments, respectively, of the gas feed means differing from Figure 1.
With reference to Figure 1, a burner according to the present invention essentially comprises a chamber 1 for the intake and combustion of a mixture of a combustible gas and of a combustion-supporting gas such as air, a chamber 2 in axial extension of the chamber 1 and adapted to allow the development of the flame. The mixing and combustion chamber 1 is advantageously defined within a cylindrical tube which may be made from a refractory alloy or thermomechanical ceramic which provides a better behaviour at high temperatures. The extension chamber 2 has a thick wall 4 made from refractory concrete with substantially circular cylindrical cross-sections. The inner walls of the chambers 1 and 2 are aligned in registering relationship with each other. The flanges 5 and 6 provide for the fluid-tight junction or sealed interconnection of both chambers. Moreover, the mounting of the burner within a furnace lO(not shown) is performed by means of a flange 7.
A metallic enclosure or casing 9 coaxially surrounds the mixing and combustion chamber 1 thereby forming an annular space 10 thereabout through which is flowing the combustion-supporting air to be fed into the chamber 1. The air is supplied through a duct or pipe 11. The shell or casing 9 further defines an intake chamber 12 for the gas supplied through a duct or piping 13.
This gas reaches the chamber 1 through a plurality of radial holes 14 extending through the cylindrical wall of the chamber 1. These holes are located in a plane extending at right angles 20to the centre line axis of the wall and advantageously over the whole periphery thereof.
The mixing and combustion chamber 1 shown on Figure 1 comprises three air feed planes P1, P2, P3 which are spaced from each other in axial relationship. Each plane comprises a number of holes 16 which are bored tangentially through the wall of the chamber. These holes are positioned in a same plane extending at right angles to the centre line axis of the chamber and allowing the ingress of the air thereinto along substantially tangential paths of travel. In the planes P1 and P2, the number 300f holes advantageously is equal to four. The plane P3 comprises eight holes for instance. Figure 2 shows a tube defining an intake and combustion chamber 1 which comprises five air feed planes, namely the planes P11, P12, P21, P22 and P3. As in the case of Figure 1, each plane comprises a number of tangential holes 16. It is obvious that this chamber may be used in the 1~3i~53i burner according to Figures 1! 3 and 4.
In the alternative embodiments of a burner according to the invention which are shown on Figures 3 and 4, the gaseous fuel or combustible gas is fed through a tube or piping 17 arranged in coaxial relation to the chamber 1 and extending thereinto through the front wall 18 closing the chamber 1 at the end opposite to the outlet or egress for the flame. According to Figure 3, the gas supplied by the tube 17 forming a gas pipe are flowing into the chamber through radial ports or holes 19 formed 10 in the tube and angularly distributed right around the latter near the closed end of the pipe. In this alternative embodiment for feeding the chamber with gas, the pipe 17 carries at its end a high voltage ignition device. The earthed electrode shown at 20 is welded to the pipe whereas the high voltage electrode designated by the reference numeral 21 is positioned along the centre line axis thereof. It consists of a rod made from a refractory alloy and placed within an alumina sheath.
As to the wall 18, it should be pointed out that it is advantageously designed so as to allow to see the flame through 20 an ultraviolet detector or sensor cell or an ionizing electrode.
In the alternative embodiment of the burner according to the invention shown on Figure 4, the tube 17 forming a gas pipe is fully open at its end located inside of the mixing chamber 1.
The feed of gas is therefore performed in axial relationship thereby allowing to dispense with or to omit the radial holes 19 shown on Figure 3. The high voltage ignition device is adapted to this gas supply process. The high voltage electrode shown at 21' extends in parallel relation to the pipe 17. To provide for its correct and reliable positioning, it is retained by an 30 insulating alumina tube 23 which surrounds it coaxially and extends through the wall 18 of the mixing and combustion chamber. The earthed electrode is advantageously constituted by that pipe.
As to the air inlet holes 16, it is seen that the first feed plane P1, P11 is located near (Figure 1) or substantially 5~1 at (Figures 3 and 4) the gas inlet holes 14, 19 or thc open end of the gas pipe 17.
In the embodiment with three air feed planes according to Figures 1, 3 and 4, both first planes P1, P2 in the direction of flow of the fluids are defined by four tangential holes 16, the holes of one plane being angularly offset or staggered for instance by 45 with respect to the holes of the other plane and are oriented tangentially in opposite directions. The third plane P3 located near the outlet of the burner comprises eight 10 tangential holes angularly distributed in reverse-directions with respect to the holes of the plane P2. In the embodiment with five air feed planes according to Figure 2, the four planes P11 to P22 are each one formed with four tangential holes regularly distributed about the centre line axis of the chamber and oriented in opposite-directions from one plane to another one. The fifth plane P3 located near the outlet of the chamber comprises eight tangential holes oriented in the reverse direction with respect to the holes of the plane P22.
The purpose of feeding the air into the mixing and 20 combustion chamber 1 within at least three planes is to reduce the rate of production of nitrogen oxides. To this end is used the fact that the production of nitrogen oxides versus the ratio of the actual amount of combustion air admitted into the combustion chamber to the stoechiometric amount of air required for a complete instantaneous combustion varies according to a bell-shaped curve, the rate or content of nitrogen oxides being maximum when this ratio is equal to 1. According to the invention, the problem of reducing the rate of production of nitrogen oxides is solved by providing the combustion in steps 30 or stages within the chamber 1 owing to the various combustion air feed planes which are axially offset or staggered in the direction of flow of the gaseous fluid within the chamber, the air feed or intakes being arranged in counter-rotating relationship from one plane to another one.
In the burner according to the invention, in a first step S~i or stage, the gas is mixed with the combustion air flowing into the chamber at the first plane according to Figures 1, 3 and 4 or at both first planes P11, P12 according to Figure 2. This air is driven or pushed against the wall of the combustion chamber by its being set into rotary motion by the tangential inlet holes 16. With this first mixture is initiated the combustion which is incomplete and not very strong or thorough. In a second step or stage, i.e. at the second air feed plane P2 according to Figures 1, 3 and 4 or in the third and fourth planes P21, P22 10 according to Figure 2, air is added in counter-rotating relationship to the mixture being burning thereby providing a substantial stirring. This would result in a substantial acceleration of the combustion while retaining an air-to-gas ratio substantially different from 1 so as to reduce the production of nitrogen oxides. In a third step or stage, the combustion would end by the arrival in the last feed plane of the air still set into rotary motion and pushed or driven against the wall by the tangential holes. This arrival of tangential air on several axially offset or staggered levels 20 into the combustion chamber makes it possible on the one hand, to provide for a complete combustion in a chamber of restricted volume owing to this strong stirring produced by the counter-rotating air feeds and, on the other hand, to reduce the production of nitrogen oxides by having the combustion carried out in steps or stages.
In the known burners of this kind, both air feed planes are very close to each other, thereby inducing a strong combustion with a very high rate of production of nitrogen oxides.
The object of the present invention is to cope with such an inconvenience and to provide a burner which does no longer suffer of the substantial drawback just referred to.
To reach that goal, the burner according to the invention is characterized in that at least three areas of air feed planes 20 are provided which are offset or staggered along the centre line axis of the chamber so as to produce a combustion in steps or stages for reducing the rate of production of nitrogen oxides.
According to an advantageous characterizing feature of the invention, the air feeds located in a first area of feed planes close to the gas feed level are adapted to provide for an incomplete and not very strong combustion, the air feeds located in the second area of feed planes are adapted to accelerate the combustion without the air-to-gas ratio reaching the stoechiometric value whereas the air feeds in the third area are 30 adapted to terminate the combustion.
According to another advantageous characterizing feature of the invention, both first air feed areas comprise each one two air feed planes with a tangential orientation in counter-rotating relationship from one plane to the other one.
According to a further characterizing feature of the 3~
invention, the means for feeding gas into the combustion chamber consist of radial holes or ports extending through the wall of the mixing and combustion chamber, this chamber being surrounded by two separate chambers for the intakes of air and gas, respectively.
According to another advantageous characterizing feature of the invention, the gas feed means consist essentially of a gas feed duct extending into the combustion chamber advantageously along the centre line axis thereof through a 10 closure wall of the chamber at the end opposite to the outlet thereof and which comprises at said first air feed plane means for exhausting the gas into the chamber, a device for igniting the gas issuing from the tube being provided near its oulets.
The invention will be better understood and further objects, characterizing features, details and advantages thereof will appear more clearly as the following explanatory description proceeds with reference to the accompanying diagrammatic drawings given by way of non-limiting examples only illustrating several presently preferred specific embodiments of 20 the invention and wherein :
- Figure 1 is a view in axial section of a burner according to the present invention;
- Figure 2 shows an axial section of a tube adapted to form a mixing and combustion chamber intended to fit a burner according to Figure 1 but designed according to an alternative embodiment; and - Figures 3 and 4 are views in axial section of a burner according to the invention showing two other embodiments, respectively, of the gas feed means differing from Figure 1.
With reference to Figure 1, a burner according to the present invention essentially comprises a chamber 1 for the intake and combustion of a mixture of a combustible gas and of a combustion-supporting gas such as air, a chamber 2 in axial extension of the chamber 1 and adapted to allow the development of the flame. The mixing and combustion chamber 1 is advantageously defined within a cylindrical tube which may be made from a refractory alloy or thermomechanical ceramic which provides a better behaviour at high temperatures. The extension chamber 2 has a thick wall 4 made from refractory concrete with substantially circular cylindrical cross-sections. The inner walls of the chambers 1 and 2 are aligned in registering relationship with each other. The flanges 5 and 6 provide for the fluid-tight junction or sealed interconnection of both chambers. Moreover, the mounting of the burner within a furnace lO(not shown) is performed by means of a flange 7.
A metallic enclosure or casing 9 coaxially surrounds the mixing and combustion chamber 1 thereby forming an annular space 10 thereabout through which is flowing the combustion-supporting air to be fed into the chamber 1. The air is supplied through a duct or pipe 11. The shell or casing 9 further defines an intake chamber 12 for the gas supplied through a duct or piping 13.
This gas reaches the chamber 1 through a plurality of radial holes 14 extending through the cylindrical wall of the chamber 1. These holes are located in a plane extending at right angles 20to the centre line axis of the wall and advantageously over the whole periphery thereof.
The mixing and combustion chamber 1 shown on Figure 1 comprises three air feed planes P1, P2, P3 which are spaced from each other in axial relationship. Each plane comprises a number of holes 16 which are bored tangentially through the wall of the chamber. These holes are positioned in a same plane extending at right angles to the centre line axis of the chamber and allowing the ingress of the air thereinto along substantially tangential paths of travel. In the planes P1 and P2, the number 300f holes advantageously is equal to four. The plane P3 comprises eight holes for instance. Figure 2 shows a tube defining an intake and combustion chamber 1 which comprises five air feed planes, namely the planes P11, P12, P21, P22 and P3. As in the case of Figure 1, each plane comprises a number of tangential holes 16. It is obvious that this chamber may be used in the 1~3i~53i burner according to Figures 1! 3 and 4.
In the alternative embodiments of a burner according to the invention which are shown on Figures 3 and 4, the gaseous fuel or combustible gas is fed through a tube or piping 17 arranged in coaxial relation to the chamber 1 and extending thereinto through the front wall 18 closing the chamber 1 at the end opposite to the outlet or egress for the flame. According to Figure 3, the gas supplied by the tube 17 forming a gas pipe are flowing into the chamber through radial ports or holes 19 formed 10 in the tube and angularly distributed right around the latter near the closed end of the pipe. In this alternative embodiment for feeding the chamber with gas, the pipe 17 carries at its end a high voltage ignition device. The earthed electrode shown at 20 is welded to the pipe whereas the high voltage electrode designated by the reference numeral 21 is positioned along the centre line axis thereof. It consists of a rod made from a refractory alloy and placed within an alumina sheath.
As to the wall 18, it should be pointed out that it is advantageously designed so as to allow to see the flame through 20 an ultraviolet detector or sensor cell or an ionizing electrode.
In the alternative embodiment of the burner according to the invention shown on Figure 4, the tube 17 forming a gas pipe is fully open at its end located inside of the mixing chamber 1.
The feed of gas is therefore performed in axial relationship thereby allowing to dispense with or to omit the radial holes 19 shown on Figure 3. The high voltage ignition device is adapted to this gas supply process. The high voltage electrode shown at 21' extends in parallel relation to the pipe 17. To provide for its correct and reliable positioning, it is retained by an 30 insulating alumina tube 23 which surrounds it coaxially and extends through the wall 18 of the mixing and combustion chamber. The earthed electrode is advantageously constituted by that pipe.
As to the air inlet holes 16, it is seen that the first feed plane P1, P11 is located near (Figure 1) or substantially 5~1 at (Figures 3 and 4) the gas inlet holes 14, 19 or thc open end of the gas pipe 17.
In the embodiment with three air feed planes according to Figures 1, 3 and 4, both first planes P1, P2 in the direction of flow of the fluids are defined by four tangential holes 16, the holes of one plane being angularly offset or staggered for instance by 45 with respect to the holes of the other plane and are oriented tangentially in opposite directions. The third plane P3 located near the outlet of the burner comprises eight 10 tangential holes angularly distributed in reverse-directions with respect to the holes of the plane P2. In the embodiment with five air feed planes according to Figure 2, the four planes P11 to P22 are each one formed with four tangential holes regularly distributed about the centre line axis of the chamber and oriented in opposite-directions from one plane to another one. The fifth plane P3 located near the outlet of the chamber comprises eight tangential holes oriented in the reverse direction with respect to the holes of the plane P22.
The purpose of feeding the air into the mixing and 20 combustion chamber 1 within at least three planes is to reduce the rate of production of nitrogen oxides. To this end is used the fact that the production of nitrogen oxides versus the ratio of the actual amount of combustion air admitted into the combustion chamber to the stoechiometric amount of air required for a complete instantaneous combustion varies according to a bell-shaped curve, the rate or content of nitrogen oxides being maximum when this ratio is equal to 1. According to the invention, the problem of reducing the rate of production of nitrogen oxides is solved by providing the combustion in steps 30 or stages within the chamber 1 owing to the various combustion air feed planes which are axially offset or staggered in the direction of flow of the gaseous fluid within the chamber, the air feed or intakes being arranged in counter-rotating relationship from one plane to another one.
In the burner according to the invention, in a first step S~i or stage, the gas is mixed with the combustion air flowing into the chamber at the first plane according to Figures 1, 3 and 4 or at both first planes P11, P12 according to Figure 2. This air is driven or pushed against the wall of the combustion chamber by its being set into rotary motion by the tangential inlet holes 16. With this first mixture is initiated the combustion which is incomplete and not very strong or thorough. In a second step or stage, i.e. at the second air feed plane P2 according to Figures 1, 3 and 4 or in the third and fourth planes P21, P22 10 according to Figure 2, air is added in counter-rotating relationship to the mixture being burning thereby providing a substantial stirring. This would result in a substantial acceleration of the combustion while retaining an air-to-gas ratio substantially different from 1 so as to reduce the production of nitrogen oxides. In a third step or stage, the combustion would end by the arrival in the last feed plane of the air still set into rotary motion and pushed or driven against the wall by the tangential holes. This arrival of tangential air on several axially offset or staggered levels 20 into the combustion chamber makes it possible on the one hand, to provide for a complete combustion in a chamber of restricted volume owing to this strong stirring produced by the counter-rotating air feeds and, on the other hand, to reduce the production of nitrogen oxides by having the combustion carried out in steps or stages.
Claims (8)
1. Mounting-hole burner comprising a chamber for the admission and combustion of a mixture of a combustible gas with air and a chamber arranged in axial extension of the mixing chamber, adapted to provide for the development of the flame, the chambers comprising substantially cylindrical walls and the air feeds being provided within at least two axially spaced planes extending at right angles to the centre line axis of the mixing and combustion chamber and in substantially tangential relation to the cylindrical wall and in counter-rotating relationship, wherein at least three areas of air feed planes are provided which are offset along the centre line axis of the mixing and combustion chamber so as to provide for a stepwise or staged combustion to reduce the rate of production of nitrogen oxides.
2. Burner according to claim 1, wherein the air feeds located in a first area of feed planes near the gas feed level are adapted to provide for an incomplete and not very strong combustion, the air feeds located in the second area of feed planes being adapted to accelerate the combustion without the air-to-gas ratio reaching the stoechiometric value whereas the air feeds in the third area are adapted to terminate the combustion.
3. Burner according to claim 2, wherein both first air feed areas comprise each one two air feed planes arranged with a tangential orientation in counter-rotating relationship from one plane to the other one.
4. Burner according to claim 1, wherein the means for feeding gas into the mixing and combustion chamber consist of radial holes extending through the wall of this chamber, this chamber being surrounded by two separate chambers for the air and gas intakes, respectively.
5. Burner according to claim 1, wherein the gas feed means consist essentially of a gas feed duct extending into the mixing and combustion chamber advantageously along the centre line axis of the latter through a wall closing the chamber at the end opposite to the outlet thereof and which is provided at the first air feed plane with means for exhausting the gas into said chamber, a device for igniting the gas issuing from the tube being provided near that gas outlet.
6. Burner according to claim 5, wherein said gas outlet means consist of radial holes formed in the gas feed duct the end of which inside of the chamber is closed and the ignition device advantageouly of the high voltage kind comprises an earthed electrode welded to the duct whereas the high voltage electrode is positioned along the centre line axis of this duct.
7. Burner according to claim 5, wherein said gas feed duct is open at its end located inside of the mixing and combustion chamber to allow the outflow of gas and the ignition device comprises a high voltage electrode which extends in parallel relation to the gas feed duct at the open end thereof inside of the chamber, the earthed electrode consisting advantageously of the duct.
8. Burner according to claim 1, wherein the wall closing said chamber at the end opposite to the outlet thereof is provided to allow to see the flame within the mixing and combustion chamber by an ultraviolet detection or sensing cell or an ionizing cell.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8708145A FR2616519B1 (en) | 1987-06-11 | 1987-06-11 | COUNTER-ROTATION OPENER AND AIR INLET BURNER |
| FR8708145 | 1987-06-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1294531C true CA1294531C (en) | 1992-01-21 |
Family
ID=9351934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000568826A Expired - Lifetime CA1294531C (en) | 1987-06-11 | 1988-06-07 | Mounting-hole burner with counter-rotating air feeds |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR0121789B1 (en) |
| CA (1) | CA1294531C (en) |
| FR (1) | FR2616519B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070231755A1 (en) * | 2004-04-30 | 2007-10-04 | Icopal A/S | Gas Fired Heating Device and a Method of Generating a Flow of Hot Air |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3187799A (en) * | 1961-04-11 | 1965-06-08 | Midland Ross Corp | Self-stabilizing combustion apparatus and method |
| GB1099232A (en) * | 1964-03-06 | 1968-01-17 | Gas Council | Improvements relating to radiant tubular heating elements |
| DE2336693A1 (en) * | 1973-07-19 | 1975-02-06 | Nassheuer Ind Ofenbau Jean | Radiant heating pipe with igniter and flame monitor - has electrode eccentrically outside gas feed pipe |
| US4021186A (en) * | 1974-06-19 | 1977-05-03 | Exxon Research And Engineering Company | Method and apparatus for reducing NOx from furnaces |
| US4060378A (en) * | 1974-12-11 | 1977-11-29 | Energiagazdalkodasi Intezet | Method of firing and furnace therefor |
| FR2379028A1 (en) * | 1977-02-01 | 1978-08-25 | Gaz De France | METAL GAS BURNER WITHOUT PREMIXING AND COUNTER-ROTATION |
| GB2128727B (en) * | 1982-09-29 | 1985-08-29 | British Gas Corp | Heating elements |
| US4525138A (en) * | 1983-10-28 | 1985-06-25 | Union Carbide Corporation | Flame signal enhancer for post-mixed burner |
| GB2175684B (en) * | 1985-04-26 | 1989-12-28 | Nippon Kokan Kk | Burner |
-
1987
- 1987-06-11 FR FR8708145A patent/FR2616519B1/en not_active Expired
-
1988
- 1988-06-07 CA CA000568826A patent/CA1294531C/en not_active Expired - Lifetime
- 1988-06-10 KR KR1019880006947A patent/KR0121789B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2616519A1 (en) | 1988-12-16 |
| KR0121789B1 (en) | 1997-11-24 |
| KR890000842A (en) | 1989-03-16 |
| FR2616519B1 (en) | 1989-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20020121 |