CN219955311U - Biomass gas low-nitrogen combustion system - Google Patents
Biomass gas low-nitrogen combustion system Download PDFInfo
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- CN219955311U CN219955311U CN202320552351.8U CN202320552351U CN219955311U CN 219955311 U CN219955311 U CN 219955311U CN 202320552351 U CN202320552351 U CN 202320552351U CN 219955311 U CN219955311 U CN 219955311U
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- Prior art keywords
- gas
- recirculation
- flue
- combustion
- passageway
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- 239000007789 gas Substances 0.000 title claims abstract description 87
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 75
- 239000002028 Biomass Substances 0.000 title claims abstract description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000003546 flue gas Substances 0.000 claims abstract description 34
- 239000007921 spray Substances 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model provides a low nitrogen combustion system of biomass gas, includes combustor and pertinence flue gas recirculation structure, the combustor is connected with the front wall of boiler, and it includes central gas passageway, central combustion-supporting wind passageway, middle level gas passageway, main combustion-supporting wind passageway and a plurality of gas spray guns, pertinence flue gas recirculation structure is including being used for to the recirculation nozzle and the recirculation flue of flue gas are sprayed to the furnace high temperature region of boiler, the recirculation nozzle is located on the furnace, the one end of recirculation flue with the afterbody flue of boiler is connected, the other end with the recirculation nozzle is connected. The burner reduces the generation of rapid NOx, thermal NOx and fuel NOx, and simultaneously, the targeted flue gas recirculation structure introduces the recirculated flue gas into a high-temperature area of the hearth, so that the peak temperature of the hearth can be accurately reduced, the generation of thermal NOx is further reduced, the safety of biomass gas combustion is improved, the emission of NOx is reduced, and the environment is prevented from being polluted.
Description
Technical Field
The utility model belongs to the technical field of biomass gas combustion, and particularly relates to a biomass gas low-nitrogen combustion system.
Background
The biomass gas is a combustible mixed gas generated by pyrolysis or gasification decomposition of raw materials containing biomass such as crop straws, forest waste, edible fungus residues, livestock manure, sewage sludge and the like at high temperature, and the combustible components mainly comprise H2, CO, hydrocarbon (NOx) and the like.
The heat value of the biomass gas is 4500-5500Kj/Nm 3 The heat value is lower, the combustion temperature is lower as a whole, and thermal NOx can be generated only in a local high-temperature area.
Because the biomass gas contains hydrogen and hydrocarbon, HCN, CN, NH, NH and other substances are generated in a step-by-step mode due to the decomposition of the hydrocarbon during combustion, and the generated nitrogen-containing compounds react with oxygen, oxygen free radicals, OH and other groups to form rapid NOx.
The biomass gas also contains a small amount of nitrogen-containing compounds, and the nitrogen-containing compounds can react with oxygen to generate fuel-type NOx.
In general, the comprehensive NOx emission of the biomass gas is about 200-350mg/Nm3, the environment is seriously polluted, and the rapid NOx accounts for more than 50%.
Therefore, it is desirable to design a low nitrogen combustion system for biomass gas that is capable of reducing rapid NOx, fuel NOx, and thermal NOx.
Disclosure of Invention
Based on the above technical problems, a biomass gas low-nitrogen combustion system is provided.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a low nitrogen combustion system of biomass gas, includes combustor and pertinence flue gas recirculation structure, the combustor is connected with the front wall of boiler, and it includes central gas passageway, central combustion-supporting wind passageway, middle level gas passageway, main combustion-supporting wind passageway and a plurality of gas spray guns, the radial cross-section of central combustion-supporting wind passageway, middle level gas passageway and main combustion-supporting wind passageway all is the annular, and regard as the center radial from inside to outside in proper order arrange, a plurality of gas spray guns regard as central gas passageway circumference equipartition in the radial outside of main combustion-supporting wind passageway, and parallel with each passageway, pertinence flue gas recirculation structure is including be used for to spray flue gas's recirculation nozzle and recirculation flue in the furnace high temperature region of boiler, the recirculation nozzle is located on the furnace, the one end of recirculation flue with the afterbody flue of boiler is connected, the other end with the recirculation nozzle is connected.
In the biomass gas low-nitrogen combustion system, the burner has staged combustion capability, so that biomass gas fuel is introduced into a combustion area through three layers (a central gas channel, a middle gas channel and a gas spray gun), and air is introduced into the combustion area through two layers (the central combustion air channel and a main combustion air channel), thereby forming staged combustion and thick-thin combustion, reducing the generation of rapid NOx, thermal NOx and fuel NOx, simultaneously, the flue gas recirculation structure introduces recirculated flue gas into a high-temperature area of a hearth, the peak temperature of the hearth can be accurately reduced, and the generation of thermal NOx and fuel NOx is reduced, so that the safety in the process of combusting biomass gas is improved, the emission of NOx is reduced, and the environment is avoided.
In addition, the export of middle level gas passageway is equipped with the gas whirl dish, the export of main combustion-supporting wind passageway is equipped with the combustion-supporting wind whirl dish, can make gas and combustion-supporting wind rotatory entering combustion area like this, can strengthen the mixed intensity of gas and air greatly, and then further reduce the formation of quick NOx.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a longitudinal cut of the present utility model;
FIG. 3 is a schematic top view of the burner of the present utility model;
FIG. 4 is a schematic diagram of the flow direction of the fluid according to the present utility model;
fig. 5 is a schematic view of the installation angle of the recirculation nozzle of the present utility model.
Detailed Description
Embodiments of the present utility model will be described below with reference to the drawings. The embodiments described in the present specification are not intended to be exhaustive or to represent the only embodiments of the present utility model. The following examples are presented for clarity of illustration of the utility model of the present patent and are not intended to limit the embodiments thereof. It will be apparent to those skilled in the art that various changes and modifications can be made in the embodiment described, and that all the obvious changes or modifications which come within the spirit and scope of the utility model are deemed to be within the scope of the utility model.
As shown in fig. 1, an embodiment of the present utility model provides a biomass gas low nitrogen combustion system, comprising a burner 110 and a flue gas recirculation structure 120.
The burner 110 is connected to the front wall of the boiler 2, and the burner 110 includes a central gas passage 111, a central combustion air passage 112, a middle layer gas passage 113, a main combustion air passage 114, and a plurality of gas injection lances 115.
The radial cross sections of the central combustion air channel 112, the middle-layer gas channel 113 and the main combustion air channel 114 are all annular, and are sequentially and radially arranged from inside to outside in sequence with the central gas channel 111 as the center, and a plurality of gas spray guns 115 are circumferentially and uniformly distributed on the radial outer side of the main combustion air channel 114 with the central gas channel 111 as the center and are parallel to the channels.
As shown in fig. 4, the biomass gas fuel is introduced into the combustion area through three layers (a central gas channel 111, a middle gas channel 113 and a gas spray gun 115), and the combustion air (air) is introduced into the combustion area through two layers (a central combustion air channel 112 and a main combustion air channel 114), thereby forming staged combustion, on one hand, the gas air is more uniformly mixed, the generation of the rapid NOx is reduced, and on the other hand, the combustion is more uniform, the combustion peak temperature is reduced, and the generation of the thermal NOx is reduced.
The staged combustion can realize the rich-lean combustion by adjusting different air-fuel ratios, the central area of the burner 110 is a rich combustion area, a small amount of air (the excess air coefficient is < 1) is provided to the area through the central combustion air channel 112, and further products CO, H+ and the like with reducibility are generated, so that the formed NOx can be reduced, the reducing atmosphere can reduce the generation of fuel NOx, the periphery of the burner 110 is a lean combustion area, and enough air (the excess air coefficient is > 1) is provided to the area through the main combustion air channel 114 so as to ensure the complete combustion of the fuel.
Wherein, as shown in fig. 2, each channel and the outlet of the spray gun are positioned on the right side of each channel.
The central gas channel 111 is used for providing a stable small amount of central stable combustion gas accounting for about 5-15%, in this embodiment, as shown in fig. 2 and 3, the outlet of the central gas channel 111 forms an end surface, the end surface has a circle of circumferential inclined surfaces, and at least one circle of central gas nozzles 111a uniformly distributed on the circumferential inclined surfaces, so that the small amount of central stable combustion gas is provided through the central gas nozzles 111 a.
As shown in fig. 3, the outlet of the central combustion-supporting air channel 112 is provided with a flame stabilizing disc 112a, so that the central area of the burner can form negative pressure, and high-temperature flue gas can form backflow, on the one hand, the consistency of ignition heat and flame is ensured, and on the other hand, the combustion peak temperature of the central area is reduced, so that the generation of thermal NOx is further reduced, in addition, the flame stabilizing disc 112a can be provided with a cooling hole 112b and/or a swirl blade 112c according to the requirement, the cooling hole 112b plays a cooling role, the flame stabilizing disc 112a is prevented from burning out, the swirl blade 112c can increase the kinetic energy of air in the radial direction, enhance the mixing of air and fuel gas, further realize uniform combustion, and form central negative pressure, and further take up the high-temperature flue gas.
As shown in fig. 3, the outlet of the middle layer gas channel 113 is provided with a gas swirling disc 113a, and the gas swirling disc 113a is provided with swirling blades with different inclination angles and numbers according to the requirements of swirling intensity.
As shown in fig. 3, the outlet of the main combustion air channel 114 is provided with a combustion air cyclone disk 114a, and the main combustion air channel 114 is provided with cyclone blades with different inclination angles and different numbers according to the requirements of cyclone strength.
The gas and the combustion air can be rotated into the combustion area through the gas swirling tray 113a and the combustion air swirling tray 114a, so that the mixing strength of the gas and the air can be greatly enhanced, and the generation of rapid NOx can be further reduced.
The number of the gas guns 115 depends on the actual demand, and as shown in fig. 3, in the present embodiment, the number of the gas guns 115 is 6.
As shown in fig. 1 and 2, the targeted flue gas recirculation structure 120 includes recirculation nozzles 121 and recirculation flues 122 for injecting flue gas into the furnace high temperature region of the boiler 2.
In the present embodiment, as shown in fig. 2 and 4, a plurality of recirculation nozzles 121 are provided, and the plurality of recirculation nozzles 121 are uniformly distributed along the circumferential direction of the furnace, each recirculation nozzle 121 is obliquely disposed on the circumferential wall of the furnace toward the tail of the boiler, and the included angle α between the center line and the radial direction of the boiler is 15-45 °, see fig. 5.
One end of the recirculation flue 122 is connected to the back flue 21 of the boiler 2, and the other end is connected to the recirculation nozzle 121.
Unlike the common flue gas external circulation system applied to the market, the recirculated flue gas is mixed with the combustion air and then is led into the burner to participate in combustion, in the embodiment of the utility model, the recirculated flue gas is led into the high-temperature area of the hearth through the recirculated flue 122, so that the peak temperature of the hearth can be accurately reduced, the generation of thermal NOx is reduced, meanwhile, the oxygen content of a local area is diluted, the generation of fuel NOx is reduced, the recirculated flue gas is not mixed with the combustion air before the burner, the recirculated flue gas is prevented from being doped into the unnecessary low-temperature area (the recirculated flue gas amount is reduced), and the thermal efficiency is improved.
In order to adjust the amount of recirculated flue gas, the targeted flue gas recirculation structure 120 further comprises a flue gas adjustment valve 123, the flue gas adjustment valve 123 being provided on the recirculation flue 122, see fig. 1.
Optionally, a suction fan (not shown) may be provided on the recirculation flue 122 for the purpose of facilitating the passage of recirculated flue gas into the high temperature region of the furnace, as is the case with the targeted flue gas recirculation structure 120.
As can be seen from the above, in the biomass gas low-nitrogen combustion system provided by the embodiment of the utility model, the burner 110 has the capability of staged combustion, so that biomass gas fuel is introduced into the combustion area through three layers (the central gas channel 111, the middle gas channel 113 and the gas spray gun 115), and air is introduced into the combustion area through two layers (the central combustion air channel 112 and the main combustion air channel 114), thereby forming staged combustion and rich-lean combustion, reducing the generation of rapid NOx, thermal NOx and fuel type NOx, and the like, and in addition, the burner 110 also has the capability of rich-lean combustion, super-strong mixing of gas and air, good flame consistency, and the like, so that the burner 110 is safer and has lower NOx emission when combusting biomass gas.
Further, the end surfaces of the middle-layer gas channel 113 and the main combustion air channel 114 are both provided with swirl plates, so that the structure can enable the gas and the combustion air to rotate into a combustion area, the mixing strength of the gas and the air can be greatly enhanced, and further the generation of rapid NOx can be further reduced.
Meanwhile, the targeted flue gas recirculation structure 120 introduces recirculated flue gas into the high temperature region of the furnace, so that the peak temperature of the furnace can be accurately reduced, and the generation of thermal NOx can be further reduced.
It will be apparent to those skilled in the art that the above embodiments are provided for illustration only and not for limitation of the utility model, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the utility model as long as they fall within the true spirit of the utility model.
Claims (8)
1. The utility model provides a low nitrogen combustion system of biomass gas, its characterized in that, includes combustor and pertinence flue gas recirculation structure, the combustor is connected with the front wall of boiler, and it includes central gas passageway, central combustion-supporting wind passageway, middle level gas passageway, main combustion-supporting wind passageway and a plurality of gas spray gun, the radial cross-section of central combustion-supporting wind passageway, middle level gas passageway and main combustion-supporting wind passageway all is annular, and regard as the center radial from inside to outside in proper order and arrange, a plurality of gas spray gun regard as central gas passageway circumference equipartition in the radial outside of main combustion-supporting wind passageway, and parallel with each passageway, pertinence flue gas recirculation structure includes and is used for to the high temperature region of furnace sprays the recirculation nozzle and the recirculation flue of flue, the recirculation nozzle is located on the furnace, the one end of recirculation flue with the afterbody flue of boiler is connected, the other end is connected with the recirculation nozzle.
2. The biomass gas low nitrogen combustion system according to claim 1, wherein the outlet of said central gas passage forms an end face, said end face having a circumferential incline with at least one circle of uniformly distributed central gas jets thereon.
3. The biomass gas low-nitrogen combustion system according to claim 2, wherein the outlet of the central combustion air channel is provided with a flame stabilizing disc.
4. A biomass gas low-nitrogen combustion system according to claim 3, wherein the outlet of the middle layer gas channel is provided with a gas swirl disk, and the outlet of the main combustion air channel is provided with a combustion air swirl disk.
5. A biomass gas low nitrogen combustion system according to any of claims 1-4, wherein said recirculation nozzle is arranged on the peripheral wall of said furnace in a manner inclined to the tail of the boiler, and the included angle between the central line and the radial direction of said boiler is 15-45 °.
6. The biomass gas low nitrogen combustion system according to claim 5, wherein the plurality of recirculation nozzles are uniformly distributed along the circumferential direction of the furnace.
7. The biomass gas low nitrogen combustion system according to claim 6, wherein said targeted flue gas recirculation structure further comprises a flue gas regulating valve disposed on said recirculation flue.
8. The biomass gas low nitrogen combustion system according to claim 7, wherein said targeted flue gas recirculation structure further comprises an exhaust fan disposed on said recirculation flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320552351.8U CN219955311U (en) | 2023-03-21 | 2023-03-21 | Biomass gas low-nitrogen combustion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320552351.8U CN219955311U (en) | 2023-03-21 | 2023-03-21 | Biomass gas low-nitrogen combustion system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219955311U true CN219955311U (en) | 2023-11-03 |
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ID=88540956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320552351.8U Active CN219955311U (en) | 2023-03-21 | 2023-03-21 | Biomass gas low-nitrogen combustion system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219955311U (en) |
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- 2023-03-21 CN CN202320552351.8U patent/CN219955311U/en active Active
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