CN215765086U - Low nitrogen oxide discharges gas burner - Google Patents
Low nitrogen oxide discharges gas burner Download PDFInfo
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- CN215765086U CN215765086U CN202122160115.5U CN202122160115U CN215765086U CN 215765086 U CN215765086 U CN 215765086U CN 202122160115 U CN202122160115 U CN 202122160115U CN 215765086 U CN215765086 U CN 215765086U
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- outer ring
- nitrogen oxide
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Abstract
The utility model provides a low-nitrogen oxide emission gas burner which can effectively reduce CO emission and nitrogen oxide emission. The air outlet pipe is communicated with the air channel; the central gas pipe communicated with the gas source is positioned in the center of the air outlet pipe, the outer ring gas pipes communicated with the gas source are positioned outside the periphery of the air outlet pipe, the rear end of the larger mixing pipe is axially opposite to and coaxially connected with the front end of the smaller outer ring gas pipe, and a suction gap is formed between the front end of the outer ring gas pipe and the rear end of the mixing pipe; an air ring pipe communicated with the air channel is arranged on the periphery of the outer ring gas pipe, and an air outlet at the front end of the air ring pipe is positioned behind the suction gap.
Description
Technical Field
The utility model relates to a gas burner with low nitrogen oxide emission.
Background
Gas burners typically have a central combustion nozzle centrally disposed in the burner and an outer ring combustion nozzle located about the periphery of the central combustion nozzle. In order to reduce nitrogen oxides, a new outer ring combustion nozzle has been developed, which comprises a coaxial mixing tube and an outer ring gas tube communicating with a gas source, the rear end of the larger mixing tube being axially opposite and connected to the front end of the smaller outer ring gas tube, there being a suction gap between the front end of the outer ring gas tube and the rear end of the mixing tube. During the use, the anterior segment of hybrid tube and outer loop gas pipe will stretch into the high temperature flue gas district in the furnace, flows out, gets into the hybrid tube through outer loop gas pipe when the gas, and flue gas in the furnace is mixed with the gas in being inhaled the hybrid tube through inhaling the clearance, burns behind the anterior outflow of hybrid tube. Because the added flue gas can cool the outer flame temperature of the flame, the process of generating oxynitride by oxygen and nitrogen is weakened, thereby reducing the generation of oxynitride and uniformly reducing the temperature peak value of the flame.
However, during the use process, the temperature peak value of the flame is still high, the reduction of the content of the nitrogen oxides is limited, and the overall emission of the nitrogen oxides is unstable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-nitrogen oxide emission gas burner which can effectively reduce CO emission and nitrogen oxide emission.
The utility model relates to a gas burner with low nitrogen oxide emission, which comprises a shell with an air channel inside, wherein an air outlet pipe is communicated with the air channel; the central gas pipe communicated with the gas source is positioned in the center of the air outlet pipe, the outer ring gas pipes communicated with the gas source are positioned outside the periphery of the air outlet pipe, the rear end of the larger mixing pipe is axially opposite to and coaxially connected with the front end of the smaller outer ring gas pipe, and a suction gap is formed between the front end of the outer ring gas pipe and the rear end of the mixing pipe; an air ring pipe communicated with the air channel is arranged on the periphery of the outer ring gas pipe, and an air outlet at the front end of the air ring pipe is positioned behind the suction gap.
In the gas burner with low nitrogen oxide emission, the rear part of the outer ring gas pipe is connected with the tapered transition section with a small front part and a big rear part, and the rear end of the tapered transition section with a big front part is communicated with a gas source.
In the low nitrogen oxide emission gas burner, the rear part of the air ring pipe is connected with the tapered pipe with a small front part and a big back part, and the rear end of the tapered pipe is communicated with the air channel.
In the gas burner with low nitrogen oxide emission, the rear end of the conical pipe is connected with the air inlet pipe which extends backwards to the periphery of the conical transition section, the rear end of the air inlet pipe is connected with the periphery of the conical transition section, and the air inlet which is communicated with the air channel is formed in the circumferential direction of the air inlet pipe.
In the gas burner with low nitrogen oxide emission, the rear end of the mixing pipe is connected with the front end of the outer ring gas pipe through the second blades extending in the radial direction.
In the gas burner with low nitrogen oxide emission, the periphery of the front end of the outer ring gas pipe is in a conical shape with a small front part and a big back part.
In the gas burner with low nitrogen oxide emission, the air outlet pipe comprises a flaring section with a large front part and a small back part at the front part, a straight section at the middle part and a contraction section with a small front part and a large back part at the back part, a flue gas backflow gap is formed between the front end of the contraction section with a small diameter and the back end of the straight section with a large diameter, and an inner mixing opening is formed on the straight section; when the combustion-supporting air is sprayed out through the air channel and the air outlet pipe, the flue gas at the periphery of the air outlet pipe is sucked into the air outlet pipe through the flue gas backflow gap and the inner mixing port to be mixed with the combustion-supporting air and then participate in combustion.
The utility model has the beneficial effects that: the fan blows combustion-supporting air into the air channel, and then the air is sprayed out through the air outlet pipe with a special structure, so that a strong flue gas backflow is formed in a combustion furnace chamber, low-temperature flue gas around the entrainment furnace wall participates in the combustion, the overall distribution of flame is changed, the combustion temperature is reduced, and NO is reducedX The flue gas is added to cool the outer flame temperature of the flame, which can weaken the process of generating NOX by oxygen and nitrogen, thereby reducing NOXThe temperature peak value of the flame is uniformly reduced.
A small amount of flue gas in the hearth and air sprayed out of the front end of the air ring pipe are mixed with fuel in the suction gap and then sprayed out of the mixing pipe to be combusted, so that the premixed three-medium fuel of the flue gas and the air can prevent the flame-out problem caused by oxygen-poor combustion, the emission of CO (CO is approximately equal to 0%) can be reduced, and the emission of nitrogen oxides is reduced. Meanwhile, air flows through the outer ring gas pipe, so that the damage of smoke with over-high temperature to materials is avoided; the outer ring gas pipe front end periphery is preceding little big back for the flue gas is inhaled the hybrid tube more easily, has improved the dynamic property that the flue gas flows.
Drawings
FIG. 1 is a front view (schematic) of a low NOx emission gas burner;
fig. 2 is a schematic connection diagram of a gas communicating pipe 23, a gas distributing pipe 24, an annular gas distributing disk 12 and the like in the low nitrogen oxide emission gas burner;
fig. 3 is a schematic view of the outer ring gas pipe 21, the gas communicating pipe 23, the gas distributing pipe 24, the housing 4, and the like;
FIG. 4 is a schematic view at the air outlet 36, etc.;
fig. 5 is a schematic view of the air inlet 34 and the like.
In the figure, an outer ring gas pipe 21, a conical transition section 22, a gas communicating pipe 23, an air ring pipe 31, a conical pipe 32, an air inlet pipe 33, an air inlet 34, an air outlet 36,
The gas distribution device comprises a central gas pipe 1, an air channel 3, a shell 4, an air outlet pipe 5, an opening expanding section 51, a straight section 52, a contracting section 53, a flue gas backflow gap 54, an inner mixing opening 55, a central air tap 6, an inner cylinder 7, an inner air outlet channel 71, an outer air outlet channel 72, a mixing pipe 8, a second blade 9, an intake gap 10, a gas distribution pipe 24, an annular gas distribution disc 12, a gas distribution cavity 121 which are communicated, an adjusting nut 13, an adjusting rod 14, an outer ring gas supply pipeline 16, a central gas supply pipeline 17 and a dustproof cover 29.
Detailed Description
Referring to fig. 1, the gas burner with low nox emission comprises a central gas pipe 1, an outer ring gas pipe 21, a housing 4 with an air channel 3 therein, an inlet of the air channel is provided with an air volume adjusting valve and is communicated with an outlet of a fan (not shown),
the front end of the air channel is communicated with an air outlet pipe 5. The air outlet pipe 5 comprises a front flaring section 51 with a large front and a small rear, a middle straight section 52 and a rear shrinking section 53 with a small front and a large rear, a flue gas backflow gap 54 is formed between the front end of the shrinking section with a small diameter and the rear end of the straight section with a large diameter, and a plurality of inner mixing openings 55 are axially formed on the straight section close to the flaring section.
The inner cylinder 7 in the air outlet pipe divides the inner space of the air outlet pipe into an air outlet channel 71 and an air outlet channel 72 in the air channel. In the axial direction of the air outlet pipe, the front end of the inner cylinder is positioned at the rear part of the flaring section. The front end of the central gas pipe 1 is provided with a gas outlet hole as a central gas nozzle 6, and the front end of the central gas pipe is positioned in an inner gas outlet channel 71 inside the inner cylinder 7.
When the combustion-supporting air is sprayed out through the air channel and the air outlet pipe, the flue gas on the periphery of the air outlet pipe is sucked into the air outlet channel 72 through the flue gas backflow gap 54 and the inner mixing port 55 to be mixed with the combustion-supporting air and then participate in combustion.
The diameter of the mixing pipe 8 is larger, and the diameter of the outer ring gas pipe is smaller. The rear end of the mixing pipe 8 is axially opposite to the front end of the outer ring gas pipe 21 and is connected by a plurality of second vanes 9 extending radially and distributed in the circumferential direction of the mixing pipe. An intake gap 10 is arranged between the front end of the outer ring gas pipe and the rear end of the mixing pipe.
The outer circumference of the front end of the outer ring gas pipe 21 is a cone with a small front and a big back. The rear end of the outer ring gas pipe 21 is communicated with a gas communicating pipe 23 through a conical transition section 22 with gradually enlarged diameter.
The rear part of the gas communicating pipe 23 extends into the gas distribution pipe 24 and is in sealing contact with the inner wall of the gas distribution pipe 24, and the gas distribution pipe 24 penetrates through the shell 4 and is communicated with a gas distribution cavity 121 in the annular gas distribution disc 12; the gas distribution plate 12 is provided with a rotatable adjusting nut 13 and a detachable dust cover 29 covering the adjusting nut, the inner periphery of the adjusting nut is connected with the adjusting rod 14 through threads, the adjusting rod 14 penetrates through the gas distribution plate 12 to extend into the gas distribution pipe 24, and the adjusting rod is connected with the rear end of the outer ring gas pipe through first blades extending in the radial direction.
The adjusting nut 13, the adjusting rod 14, the outer ring gas pipe 21 and the mixing pipe 8 are coaxial, and the adjusting nut is rotated to drive the adjusting rod, the outer ring gas pipe and the mixing pipe to move axially; a gas distribution cavity 121 in the gas distribution disc 12 is communicated with a gas source through an outer ring gas supply pipeline 16; the fuel gas enters the fuel gas distribution chamber 121 through the outer ring fuel gas supply pipeline 16, and then enters the mixing pipe 8 through the fuel gas distribution pipe 24, the fuel gas communicating pipe 23, the conical transition section 22 and the outer ring fuel gas pipe 21.
The central gas pipe is communicated with a gas source through a central gas supply pipeline 17. The outer ring gas supply pipeline 16 and the central gas supply pipeline 17 are both provided with regulating valves.
The air ring pipe 31 has an air outlet 36 at the front end, and is connected to an air inlet pipe 33 at the rear end through a tapered pipe 32, and the rear end of the air inlet pipe 33 is hermetically connected to the periphery of the tapered transition section 22. The wall of the air inlet pipe is provided with a plurality of air inlets 34 along the circumferential direction, and the air inlets 34 are communicated with the air channel 3 of the burner.
A small amount of flue gas in the hearth and air sprayed out of the air channel 3, the air inlet 34, the air inlet pipe 33 and the conical pipe 32 through the air outlet 36 at the front end of the air circular pipe 31 are mixed and then reach the periphery of the front suction gap 10, and the mixture of the suction gap and the fuel 7 reaches the front mixing pipe 8. Meanwhile, air flows through the periphery of the outer ring gas pipe 21, so that damage of smoke with over-high temperature to materials is avoided.
Claims (7)
1. A gas burner with low nitrogen oxide emission comprises a shell with an air channel inside, wherein an air outlet pipe is communicated with the air channel; the central gas pipe that is linked together with the gas source is located a tuber pipe center, and a plurality of outer loop gas pipes that are linked together with the gas source are located a tuber pipe peripheral outside, characterized by: the rear end of the larger mixing pipe is axially opposite to and coaxially connected with the front end of the smaller outer ring gas pipe, and a suction gap is formed between the front end of the outer ring gas pipe and the rear end of the mixing pipe; an air ring pipe communicated with the air channel is arranged on the periphery of the outer ring gas pipe, and an air outlet at the front end of the air ring pipe is positioned behind the suction gap.
2. The gas burner with low nitrogen oxide emission according to claim 1, wherein: the rear part of the outer ring gas pipe is connected with a conical transition section with a small front part and a big rear part, and the rear end of the larger conical transition section is communicated with a gas source.
3. The gas burner with low nitrogen oxide emission according to claim 2, wherein: the rear part of the air ring pipe is connected with a tapered pipe with a small front part and a big back part, and the rear end of the tapered pipe is communicated with the air channel.
4. The gas burner with low nitrogen oxide emission according to claim 3, wherein: the rear end of the conical pipe is connected with an air inlet pipe which extends backwards to the periphery of the conical transition section, the rear end of the air inlet pipe is connected with the periphery of the conical transition section, and an air inlet communicated with the air channel is formed in the circumferential direction of the air inlet pipe.
5. The gas burner with low nitrogen oxide emission according to claim 1, wherein: the rear end of the mixing pipe is connected with the front end of the outer ring gas pipe through a second blade extending in the radial direction.
6. The gas burner with low nitrogen oxide emission according to claim 1, wherein: the periphery of the front end of the outer ring gas pipe is in a conical shape with a small front part and a big back part.
7. The gas burner with low nitrogen oxide emission according to claim 1, wherein: the air outlet pipe comprises a flaring section with a large front part and a small back part at the front part, a straight section at the middle part and a contraction section with a small front part and a large back part at the back part, a flue gas backflow gap is formed between the front end of the contraction section with a small diameter and the back end of the straight section with a large diameter, and an inner mixing opening is formed on the straight section; when the combustion-supporting air is sprayed out through the air channel and the air outlet pipe, the flue gas at the periphery of the air outlet pipe is sucked into the air outlet pipe through the flue gas backflow gap and the inner mixing port to be mixed with the combustion-supporting air and then participate in combustion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122160115.5U CN215765086U (en) | 2021-09-07 | 2021-09-07 | Low nitrogen oxide discharges gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122160115.5U CN215765086U (en) | 2021-09-07 | 2021-09-07 | Low nitrogen oxide discharges gas burner |
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| Publication Number | Publication Date |
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| CN215765086U true CN215765086U (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122160115.5U Active CN215765086U (en) | 2021-09-07 | 2021-09-07 | Low nitrogen oxide discharges gas burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701156A (en) * | 2021-09-07 | 2021-11-26 | 欧保(中国)环境工程股份有限公司 | Gas burner with low nitrogen oxide emission |
-
2021
- 2021-09-07 CN CN202122160115.5U patent/CN215765086U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701156A (en) * | 2021-09-07 | 2021-11-26 | 欧保(中国)环境工程股份有限公司 | Gas burner with low nitrogen oxide emission |
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