CN211694876U - Low-nitrogen furnace internal reflux gas burner - Google Patents
Low-nitrogen furnace internal reflux gas burner Download PDFInfo
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- CN211694876U CN211694876U CN202020139567.8U CN202020139567U CN211694876U CN 211694876 U CN211694876 U CN 211694876U CN 202020139567 U CN202020139567 U CN 202020139567U CN 211694876 U CN211694876 U CN 211694876U
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Abstract
The patent provides a low-nitrogen furnace internal reflux gas burner with low nitrogen oxide emission concentration, which comprises a central gas pipe, an outer gas pipe, a shell with an air channel inside and an air outlet pipe; the front part of the front air outlet pipe is a flaring section; a flue gas backflow gap is formed between the end of the rear section air outlet pipe and the rear end of the front section air outlet pipe; when the combustion-supporting air is sprayed out through the air channel and the air outlet pipe, the flue gas is sucked into the air outlet pipe through the flue gas backflow gap to be mixed with the combustion-supporting air and then participate in combustion; a smoke suction gap is arranged between the front end of the outer annular air pipe positioned at the periphery of the air outlet pipe and the rear end of the air suction mixing pipe; when the fuel gas flows out through the outer annular gas pipe and enters the air suction mixing pipe, the flue gas is sucked into the air suction mixing pipe through the flue gas suction gap to be mixed with the fuel gas, and the flue gas flows out from the front part of the air suction mixing pipe to be combusted; the central air pipe and the outer annular air pipe are communicated with a fuel gas source through air supply pipelines, and each air supply pipeline is provided with a regulating valve.
Description
Technical Field
The patent relates to a backflow gas burner in a low-nitrogen furnace.
Background
Most low-nitrogen burners with low emissions of 30mg currently use the FGR flue gas recirculation technology to supply 15-25% of the flue gas to the combustion process, which lowers the flame temperature and thereby reduces the Nox value. The flue gas at the tail part of the boiler is introduced into the whole air inlet path through the fan, the flue gas is put into the combustor again for combustion, the surface temperature of the flame is reduced, the increased flue gas can absorb the temperature of the flame, and because 15-25% of the flue gas is put into the combustor in a large proportion, the heat efficiency of the boiler is affected, and the energy consumption is increased.
Disclosure of Invention
The purpose of this patent is to provide a low nitrogen furnace internal reflux gas combustor that nitrogen oxide emission concentration is lower.
The low-nitrogen furnace internal reflux gas burner comprises a central air pipe, an outer annular air pipe and a shell with an air channel inside, wherein an inlet of the air channel is communicated with an outlet of a fan, and an air outlet pipe is communicated with the air channel; the front end of the central air pipe is provided with a central air tap and is positioned in the central part of the air outlet pipe, the air outlet pipe comprises a front section air outlet pipe and a conical rear section air outlet pipe with a small front part and a large rear part, and the front part of the front section air outlet pipe is an opening expanding section with a large front part and a small rear part; the front end of the rear section air outlet pipe is smaller in diameter, and a flue gas backflow gap is formed between the front end of the front section air outlet pipe with the larger diameter and the rear end of the rear section air outlet pipe; 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 to be mixed with the combustion-supporting air and then participate in combustion; the outer annular air pipes are positioned at the periphery of the air outlet pipe; the front end of the outer annular air pipe is opposite to the rear end of the air suction mixing pipe with the diameter larger than that of the outer annular air pipe, and a flue gas suction gap is formed between the front end of the outer annular air pipe and the rear end of the air suction mixing pipe;
the central air pipe and the outer annular air pipe are communicated with a fuel gas source through air supply pipelines, and each air supply pipeline is provided with an adjusting valve;
when the gas flows out through the outer annular gas pipe and enters the gas suction mixing pipe, the peripheral gas is sucked into the gas suction mixing pipe through the gas suction gap to be mixed with the gas, and the gas flows out from the front part of the gas suction mixing pipe to be combusted.
The internal reflux gas burner in the low-nitrogen furnace also comprises an inner cylinder positioned in the air outlet pipe, the inner cylinder divides the inner space of the air outlet pipe into an inner air outlet channel and an outer air outlet channel, and the front end of the central air pipe and the central air tap are positioned in the inner air outlet 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.
In the low-nitrogen furnace internal reflux gas burner, the front end of the outer annular gas pipe is connected with the rear end of the gas suction mixing pipe through the second blades extending in the radial direction; the rear part of the outer air pipe extends into the air distribution pipe and is in sealing contact with the inner wall of the air distribution pipe, and the air distribution pipe penetrates through the shell and is communicated with an air distribution cavity in the annular air distribution disc; the gas distribution plate is provided with a rotatable adjusting nut, the inner periphery of the adjusting nut is connected with an adjusting rod through threads, and the adjusting rod penetrates through the gas distribution plate and extends into the gas distribution pipe so as to be connected with the outer annular gas pipe through a first blade extending in the radial direction; the adjusting nut, the adjusting rod, the outer annular air pipe and the air suction mixing pipe are coaxial, and the adjusting nut is rotated to drive the adjusting rod, the outer annular air pipe and the air suction mixing pipe to axially move; the gas distribution cavity in the gas distribution disc is communicated with a gas source through a gas supply pipeline; the gas enters the gas distribution cavity through the gas supply pipeline and then enters the outer ring gas pipe through the gas distribution pipe. Adopt spare parts such as adjusting nut, distribution pipe, second blade, first blade to constitute the mixing pipe axial adjustment mechanism of breathing in, can rotate adjusting nut and can adjust the axial position of mixing pipe of breathing in under the prerequisite of guaranteeing air and gas isolation, and then adjust flame length.
In the low-nitrogen furnace internal reflux gas burner, the front end surface of the air suction mixing pipe is an inclined plane back to the axis of the air outlet pipe. Therefore, the smoke can better flow back to the rear end of the suction mixing pipe.
The beneficial effect of this patent: this patent adopts and draws and penetrates wind backward flow technique, the fan passes through the play tuber pipe blowout of special construction with combustion-supporting wind, form a powerful flue gas backward flow in the furnace of burning, the entrainment oven low temperature flue gas all around goes in participating in the burning, change flame overall distribution, reduce the temperature of burning, NOX's formation has been reduced, the flue gas of adding simultaneously cools off flame's outer flame temperature, this will weaken oxygen and nitrogen gas generation NOX's process, thereby reduce NOX's formation, evenly reduce the temperature peak value of flame. Meanwhile, a drainage air nozzle backflow technology is adopted, fuel gas flows out from an outer ring air nozzle under certain pressure and enters an air suction mixing pipe, air and smoke around the air suction mixing pipe enter the air suction mixing pipe by means of the pressure of the fuel gas and flow out from the front part of the air mixing pipe to be combusted, and because the fuel gas, the air and the smoke are premixed, the temperature of flame is uniform, the residence time of the fuel gas in a high-temperature area is shortened, and the combustion temperature is greatly reduced;
the central gas of patent is by central air cock blowout, adopts the diffusion formula burning, and is small, compact structure, can not temper, and flame is stable to guaranteed that whole burning is stable.
In a word, the technology of the backflow technology of the air guide nozzle, the backflow technology of the air injection and the like is adopted in the technology, so that the nitrogen oxide in the exhausted tail gas reaches 30mg/m3The method and the device have the advantages that the air inlet flow is adjusted in real time by adopting the prior art such as an adjusting valve and the like, so that the purposes of intelligent control, simplicity in operation, convenience in maintenance, long service life of parts, low energy consumption, energy conservation, low nitrogen emission and the like are achieved.
Drawings
FIG. 1 is a perspective view of a return gas burner in a low nitrogen furnace;
FIG. 2 is a perspective view of a central air tube, air distribution plate, etc.;
FIG. 3 is a perspective view of the outer annular air tube, inner barrel, etc.;
FIG. 4 is a perspective view of the adjustment lever, outer collar, etc.;
FIG. 5 is another perspective view of a return gas burner in a low nitrogen furnace;
FIG. 6 is a front view of a return gas burner in a low nitrogen furnace;
fig. 7 is a schematic view of an outer annular air tube, an adjustment lever, etc.
Detailed Description
Referring to fig. 1, the low-nitrogen furnace internal reflux gas burner comprises a central gas pipe 1, an outer gas pipe 2 and a shell 4 with an air channel 3 inside, wherein an inlet of the air channel is provided with an air volume adjusting valve 30 and is communicated with an outlet of a fan (not shown), and an air outlet pipe 5 is communicated. 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.
The air outlet pipe 5 comprises a front section air outlet pipe 51 and a conical rear section air outlet pipe 52 with a small front part and a large rear part, and the front part of the front section air outlet pipe 51 is provided with a flaring section 511 with a large front part and a small rear part; the front end of the rear segment air outlet pipe 52 has a smaller diameter, and a flue gas backflow gap 53 is formed between the front end of the front segment air outlet pipe with the larger diameter and the rear end of the rear segment air outlet pipe.
When the combustion-supporting air is sprayed out through the air channel and the air outlet pipe 5, 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 to be mixed with the combustion-supporting air, and then the mixed flue gas participates in combustion.
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 air pipe 1 is provided with an air outlet hole which is used as a central air tap 6 and extends along the radial direction, and the front end of the central air pipe is positioned in an inner air outlet channel 71 inside the inner cylinder 7.
8 outer air pipes 2 are positioned at the periphery of the air outlet pipe 5; the front end of the outer annular duct 2 is axially opposite to the rear end of a suction mixing duct 8 of larger diameter than the latter and is connected by second vanes 9 extending in the radial direction. A smoke suction gap 10 is arranged between the front end of the outer annular air pipe and the rear end of the air suction mixing pipe; when the gas flows out through the outer annular gas pipe and enters the gas suction mixing pipe, the peripheral gas is sucked into the gas suction mixing pipe through the gas suction gap 10 to be mixed with the gas, and the gas flows out from the front part of the gas suction mixing pipe to be combusted. The front end surface of the air suction mixing pipe 8 is an inclined surface 81 back to the axis of the air outlet pipe.
The rear part of the outer air distribution pipe extends into the air distribution pipe 11 and is in sealing contact with the inner wall of the air distribution pipe, and the air distribution pipe 11 penetrates through the shell 4 and is communicated with an air distribution cavity 121 in the annular air 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 11, and the adjusting rod is connected with the rear end of the outer gas distribution pipe through a first blade 15 extending in the radial direction.
The adjusting nut 13, the adjusting rod 14, the outer annular air pipe 2 and the air suction mixing pipe 8 are coaxial, and the adjusting nut is rotated to drive the adjusting rod, the outer annular air pipe and the air suction mixing pipe to move axially; the 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 gas enters the gas distribution cavity through the outer ring gas supply pipeline and then enters the outer ring gas pipe through the gas distribution pipe.
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 gas that gets into in the low-nitrogen gas combustor burns and releases heat and heats equipment such as boiler, adopt and draw and penetrate wind backward flow technique, the fan of high pressure passes through the tuber pipe blowout with combustion-supporting wind, form a powerful flue gas backward flow in the furnace of burning, low temperature flue gas is gone in participating in the burning around the entrainment oven, change flame overall distribution, reduce the temperature of burning, NOX's formation has been reduced, the flue gas that adds simultaneously cools off flame's outer flame temperature, this process that will weaken oxygen and nitrogen gas generation NOX, thereby reduce NOX's formation, evenly reduce the temperature peak value of flame. Meanwhile, a drainage air nozzle technology is adopted, gas flows out of an air nozzle under certain pressure and enters an air suction mixing pipe, air and smoke around the air suction mixing pipe enter the air suction mixing pipe by means of the pressure of the gas and flow out of the front part of the air suction mixing pipe for combustion, and the gas, the air and the smoke are premixed, so that the temperature of flame is uniform, and the combustion temperature is greatly reduced; the residence time of the fuel gas in the high-temperature area is shortened.
Claims (4)
1. The low-nitrogen furnace internal reflux gas burner comprises a central air pipe, an outer annular air pipe and a shell with an air channel inside, wherein an inlet of the air channel is communicated with an outlet of a fan, and an air outlet pipe is communicated with the air channel; the central trachea front end is provided with central air cock and is located out tuber pipe central part, characterized by: the air outlet pipe comprises a front section air outlet pipe and a conical rear section air outlet pipe with a small front part and a large rear part, and the front part of the front section air outlet pipe is an opening expanding section with a large front part and a small rear part; the front end of the rear section air outlet pipe is smaller in diameter, and a flue gas backflow gap is formed between the front end of the front section air outlet pipe with the larger diameter and the rear end of the rear section air outlet pipe; 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 to be mixed with the combustion-supporting air and then participate in combustion; the outer annular air pipes are positioned at the periphery of the air outlet pipe; the front end of the outer annular air pipe is opposite to the rear end of the air suction mixing pipe with the diameter larger than that of the outer annular air pipe, and a flue gas suction gap is formed between the front end of the outer annular air pipe and the rear end of the air suction mixing pipe;
the central air pipe and the outer annular air pipe are communicated with a fuel gas source through air supply pipelines, and each air supply pipeline is provided with an adjusting valve;
when the gas flows out through the outer annular gas pipe and enters the gas suction mixing pipe, the peripheral gas is sucked into the gas suction mixing pipe through the gas suction gap to be mixed with the gas, and the gas flows out from the front part of the gas suction mixing pipe to be combusted.
2. The low nitrogen furnace return gas burner of claim 1, wherein: the inner cylinder divides the inner space of the air outlet pipe into an inner air outlet channel and an outer air outlet channel, and the front end of the central air pipe and the central air tap are positioned in the inner air outlet 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.
3. The low nitrogen furnace return gas burner of claim 1, wherein: the front end of the outer annular air pipe is connected with the rear end of the air suction mixing pipe through a second blade extending in the radial direction; the rear part of the outer air pipe extends into the air distribution pipe and is in sealing contact with the inner wall of the air distribution pipe, and the air distribution pipe penetrates through the shell and is communicated with an air distribution cavity in the annular air distribution disc; the gas distribution plate is provided with a rotatable adjusting nut, the inner periphery of the adjusting nut is connected with an adjusting rod through threads, and the adjusting rod penetrates through the gas distribution plate and extends into the gas distribution pipe so as to be connected with the outer annular gas pipe through a first blade extending in the radial direction; the adjusting nut, the adjusting rod, the outer annular air pipe and the air suction mixing pipe are coaxial, and the adjusting nut is rotated to drive the adjusting rod, the outer annular air pipe and the air suction mixing pipe to axially move; the gas distribution cavity in the gas distribution disc is communicated with a gas source through a gas supply pipeline; the gas enters the gas distribution cavity through the gas supply pipeline and then enters the outer ring gas pipe through the gas distribution pipe.
4. The low nitrogen furnace return gas burner of claim 1, wherein: the front end surface of the air suction mixing pipe is an inclined plane back to the axis of the air outlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020139567.8U CN211694876U (en) | 2020-01-21 | 2020-01-21 | Low-nitrogen furnace internal reflux gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020139567.8U CN211694876U (en) | 2020-01-21 | 2020-01-21 | Low-nitrogen furnace internal reflux gas burner |
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| Publication Number | Publication Date |
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| CN211694876U true CN211694876U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020139567.8U Active CN211694876U (en) | 2020-01-21 | 2020-01-21 | Low-nitrogen furnace internal reflux gas burner |
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| CN (1) | CN211694876U (en) |
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