CN209801470U - low-nitrogen combustion system of circulating fluidized bed boiler - Google Patents
low-nitrogen combustion system of circulating fluidized bed boiler Download PDFInfo
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- CN209801470U CN209801470U CN201920401511.2U CN201920401511U CN209801470U CN 209801470 U CN209801470 U CN 209801470U CN 201920401511 U CN201920401511 U CN 201920401511U CN 209801470 U CN209801470 U CN 209801470U
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- air
- distribution plate
- air supply
- fluidized bed
- combustion furnace
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 61
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 21
- 238000009826 distribution Methods 0.000 claims abstract description 44
- 239000002918 waste heat Substances 0.000 claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003546 flue gas Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 21
- 239000003245 coal Substances 0.000 claims description 20
- 239000002893 slag Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 206010021143 Hypoxia Diseases 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Abstract
the utility model belongs to the technical field of the environmental protection equipment and specifically relates to circulating fluidized bed boiler low-nitrogen combustion system. The method comprises the following steps: a combustion furnace; an air distribution plate arranged at the lower section of the inner side of the combustion furnace, and a plurality of air caps arranged on the air distribution platean air inlet is arranged on the combustion furnace at the lower side of the air distribution plate; the inlet of the cyclone separator is connected with the combustion furnace, and the flue gas outlet is connected with a waste heat boiler; the primary air supply pipe is communicated with the air inlet at the outlet end and is connected with the exhaust port of the waste heat boiler at the inlet end, the natural air is connected with the inlet end, the structure is ingenious, the design is reasonable, and NO can be effectively reducedXAnd the problems in the prior art can be solved.
Description
The technical field is as follows:
The utility model belongs to the technical field of the environmental protection equipment and specifically relates to circulating fluidized bed boiler low-nitrogen combustion system.
background art:
According to NOxThe formation conditions of (2) are shown inxIs the temperature and the air quantity of the combustion zone. Therefore, the low-nitrogen combustion technology is mainly achieved by controlling the temperature and the air quantity in the combustion area to prevent NOxGeneration and reduction of emissions thereof. The circulating fluidized bed boiler adopts the clean coal combustion technology with the highest industrialization degree, and has advantages in the aspect of low-nitrogen combustion technology.
9 months in 2014, the national improvement committee, the ministry of environmental protection and the national energy supply authority jointly issue a coal and electricity energy conservation and emission reduction upgrading and improvement action plan (2014-2020), and the newly-built coal-fired unit is required to be close to or basically reach the emission limit value of the gas turbine, namely NO and SO are required to be discharged under the condition that the reference oxygen content is 6 percent2And the smoke emission concentration is not more than 50, 35 and 10mg/Nm3this makes it difficult to achieve the above-mentioned requirements in the existing circulating fluidized bed boilers having the advantage of low nitrogen combustion. At present, the existing circulating fluidized bed unit in China causes the NO of CFB boilers of a plurality of power plants due to factors such as large coal variety change, poor separation efficiency of separators, unreasonable primary and secondary air ratio adjustment and the likexThe discharge concentration exceeds 300mg/Nm3the emission requirement cannot be met, so the SNCR + SCR combined denitration system is required to be installed in the power plant, the operation cost of an enterprise is obviously increased, the problems generated after denitration are more, and the initial investment of equipment is extremely large. Therefore, there is a need for an improved circulating fluidized bed boiler which further reduces NOxand (4) generating.
The above description is included in the technical recognition scope of the utility model, and does not necessarily constitute the prior art.
the utility model has the following contents:
the utility model provides a circulating fluidized bed boiler low-nitrogen combustion system, its structure is ingeniousReasonable design, can effectively reduce NOxAnd the problems in the prior art can be solved.
the utility model provides a technical scheme: the circulating fluidized bed boiler low-nitrogen combustion system comprises:
a combustion furnace;
The air distribution plate is arranged at the lower section of the inner side of the combustion furnace, a plurality of air caps are arranged on the air distribution plate, and an air inlet is arranged on the combustion furnace at the lower side of the air distribution plate;
The inlet of the cyclone separator is connected with the combustion furnace, and the flue gas outlet is connected with a waste heat boiler;
The outlet end of the primary air supply pipe is communicated with the air inlet, and the inlet end of the primary air supply pipe is connected with the exhaust port of the waste heat boiler and natural air.
Furthermore, the air caps are arranged on the air distribution plate in an array manner, and the air distribution plate is provided with slag falling pipes;
And dividing the area on the air distribution plate close to the outer edge of the air distribution plate and the area close to the slag falling pipe into a first air cap arrangement area, dividing the area on the air distribution plate outside the first air cap arrangement area into a second air cap arrangement area, wherein the ventilation resistance of the air cap in the first air cap arrangement area is smaller than that of the air cap in the second air cap arrangement area.
Further, the aperture of the blast cap in the first blast cap arrangement area is larger than the aperture of the blast cap in the second blast cap arrangement area.
furthermore, the combustion furnace on the upper side of the air distribution plate is provided with at least two oppositely arranged secondary air supply joints a and at least two oppositely arranged secondary air supply joints b, and the secondary air supply joints a and the secondary air supply joints b are positioned at different heights on the combustion furnace;
The system also comprises a secondary air supply pipe, wherein the air inlet end of the secondary air supply pipe is connected with natural air, and the outlet end of the secondary air supply pipe is connected with each secondary air supply joint a and each secondary air supply joint b.
further, an air preheater a is arranged on the secondary air supply pipe and connected with an exhaust port of the waste heat boiler;
and/or an air preheater b is arranged on the primary air supply pipe and connected with an exhaust port of the waste heat boiler.
Furthermore, the bottom wall of the air inlet at the lower side of the air distribution plate is obliquely and upwards arranged along the air flow direction.
Furthermore, the system also comprises a coal supply device, a coal supply port connected with the coal supply device is arranged on the combustion furnace, and the coal supply port is arranged between the secondary air supply pipe and the air distribution plate.
further, the cyclone separator is a volute type cyclone separator.
furthermore, the system also comprises a material returning device, wherein the feeding end of the material returning device is connected with the ash discharging end of the cyclone separator, and the discharging end of the material returning device is connected with the combustion furnace.
The utility model provides a circulating fluidized bed boiler low-nitrogen combustion system, its structure is ingenious, reasonable in design, can effectual reduction NOxAnd the problems in the prior art can be solved.
Description of the drawings:
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic layout view of the wind caps on the wind distribution plate according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a hood in a second hood arrangement area according to an embodiment of the present invention;
Fig. 4 is a schematic structural view of a hood in a first hood arrangement area according to an embodiment of the present invention;
FIG. 5 is a schematic view of the wind path connection structure of the primary air supply duct and the secondary air supply duct of the present invention;
in the figure, 1, a combustion furnace; 2. a wind distribution plate; 3. a hood; 4. a cyclone separator; 5. a primary air supply pipe; 6. an air inlet; 7. a slag falling pipe; 8. a first hood arrangement region; 9. a second hood arrangement region; 10. A secondary air supply joint a; 11. a secondary air supply joint b; 12. an air preheater a; 13. a coal feeding device; 14. A material returning device; 15. air holes; 16. a secondary air supply pipe; 17. a waste heat boiler; 18. and (b) an air preheater.
the specific implementation mode is as follows:
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings.
the utility model discloses an embodiment is shown in fig. 1-5, circulating fluidized bed boiler low nitrogen combustion system, include:
A combustion furnace 1;
the air distribution plate 2 is arranged at the lower section of the inner side of the combustion furnace 1, a plurality of air caps 3 are arranged on the air distribution plate 2, and an air inlet 6 is arranged on the combustion furnace 1 at the lower side of the air distribution plate 2;
The cyclone separator 4 is connected with the combustion furnace 1, and a flue gas outlet is connected with a waste heat boiler 17;
and the outlet end of the primary air supply pipe 5 is communicated with the air inlet 6, and the inlet end of the primary air supply pipe is simultaneously connected with an exhaust port of the waste heat boiler 17 and is connected with natural air.
The utility model discloses a combustion system is when using the use, owing to let in gas from air intake 6 to air distribution plate 2 through once air feed pipe 5 for the gas that lets in upwards will fire the material in burning furnace 1 and blow up the burning via hood 3, because the utility model discloses in, often gather in being close to air distribution plate 2 position department to newly-added material, this region can produce a large amount of volatiles, owing to have a large amount of nitrogen in this region, through directly linking to each other with cyclone 4's air exit and once air feed pipe 5, can reduce the oxygen content that lets in gas in once air feed pipe 5, and then can be in the region department of being close to air distribution plate 2, owing to let in gaseous oxygen shortage and reduce NO and locate, owing to let in gaseous oxygen shortageXThe amount of production of N0x can be effectively reduced.
Furthermore, because the utility model discloses in, supply tuber pipe 5 once to link to each other with exhaust-heat boiler 17's gas vent, still can carry out effectual intensification to the air in supplying tuber pipe 5 once, can improve energy efficiency.
In a preferred embodiment, the primary air supply pipe 5 is further provided with a primary air supply fan, and in order to adjust the oxygen content of the air introduced into the primary air supply pipe 5, adjusting valves can be respectively arranged between the primary air supply pipe 5 and an air outlet of an exhaust port of the exhaust-heat boiler 17, and between the primary air supply pipe 5 and natural air.
in order to enable air introduced by the primary air supply pipe 5 to uniformly flow out of the air distribution plate 2 and prevent the increase of N0x caused by local oxygen enrichment due to nonuniform fluidization in the combustion furnace 1, the method is further optimized in that the air caps 3 are arranged on the air distribution plate 2 in an array manner, and the air distribution plate 2 is provided with a slag falling pipe 7;
and the area of the air distribution plate 2 close to the outer edge and the area of the air distribution plate close to the slag falling pipe are divided into a first air cap arrangement area 8, the area of the air distribution plate 2 outside the first air cap arrangement area 8 is divided into a second air cap arrangement area 9, the ventilation resistance of the air cap 3 in the first air cap arrangement area 8 is smaller than that of the air cap 3 in the second air cap arrangement area 9.
Specifically, the first hood arrangement region 8 and the second hood arrangement region 9 are arranged as shown in fig. 2.
From this at the plate for distributing wind 2 edge, the slag pipe 7 department of accumulating the material sediment easily, through the ventilation resistance who reduces hood 3, guarantee that gas can stably flow out, prevent to block up.
in a preferred embodiment, it is possible to arrange that, as shown in fig. 3 and 4, the aperture on the hood 3 in the first hood arrangement region 8 is larger than the aperture on the hood 3 in the second hood arrangement region 9.
Alternatively, in an alternative embodiment, the number of the air holes 15 on the hood 3 in the first hood arrangement region 8 is greater than the number of the air holes 15 on the hood 3 in the second hood arrangement region 9.
More specifically, the combustion furnace 1 on the upper side of the air distribution plate 2 is provided with at least two oppositely arranged secondary air supply joints a10 and at least two oppositely arranged secondary air supply joints b11, and the secondary air supply joints a10 and the secondary air supply joints b11 are located at different heights on the combustion furnace 1;
The system also comprises a secondary air supply pipe 16, wherein the air inlet end of the secondary air supply pipe 16 is connected with natural air, and the outlet end of the secondary air supply pipe 16 is connected with each secondary air supply joint a10 and each secondary air supply joint b 11.
Therefore, the secondary air supply joint a10 is arranged oppositely, the secondary air supply joint b11 is arranged oppositely, and the secondary air supply joint a10 and the secondary air supply joint b11 are positioned at different heights on the combustion furnace 1, so that the secondary air and the materials in the combustion furnace 1 can be mixed more uniformly, and the phenomena of local oxygen enrichment and local oxygen deficiency are prevented. Moreover, by arranging a plurality of secondary air supply joints, the space of the reduction area of the whole combustion furnace 1 can be adjusted by adjusting the air supply rates of the secondary air supply joint a10 and the secondary air supply joint b11, for example, the air supply rate of the secondary air supply joint at the next time accounts for 10-15% of the air supply rate of the whole secondary air supply pipe 16 by adjustment, the reduction area can be effectively enlarged, the volatile matters volatilized from the materials at the lower side can stay in the reduction area for a longer time, and the generation of N0x is further reduced. In a specific adjusting mode, adjusting valves can be arranged on the two secondary air supply connectors.
the further optimization is that an air preheater a12 is arranged on the secondary air supply pipe 16, and the air preheater a12 is connected with an exhaust port of the waste heat boiler 17;
And/or an air preheater b18 is arranged on the primary air supply pipe, and the air preheater b18 is connected with an exhaust port of the waste heat boiler 17.
Therefore, the gas in the primary air supply pipe 5 or the secondary air supply pipe 16 can be preheated through the flue gas discharged by the cyclone separator 4, so that the heat of the flue gas discharged by the cyclone separator 4 can be recovered, and the heat loss in the combustion furnace 1 can be reduced.
The further optimization is that the bottom wall of the air inlet 6 on the lower side of the air distribution plate 2 is obliquely and upwardly arranged along the air flow direction. The whole air inlet 6 is arranged in a horn shape, so that the air flow pressure borne by the lower side of the air distribution plate 2 is more uniform, and uniform air flow discharged by each air cap 3 is facilitated.
Further, in the present embodiment, the system further includes a coal supply device 13, a coal supply port connected to the coal supply device 13 is provided on the combustion furnace 1, and the coal supply port is provided between the secondary air supply pipe 16 and the air distribution plate 2. Therefore, the newly added materials fall into the lower side of the secondary air supply joint, and after the materials are heated in the furnace, the volatile matters generated by volatilization analysis are in the oxygen deficiency reduction area at the bottom, so that NO is effectively inhibitedxAnd (4) generating. By arranging the coal supply port between the secondary air supply pipe 16 and the air distribution plate 2, newly filled materials can be prevented from entering the oxygen-enriched area on the upper side of the secondary air supply pipe 16.
Wherein the coal feeder 13 may be selected from existing coal feeders 13, such as hopper-and-cage type coal feeders 13, as shown in the figures.
More specifically, in the present embodiment, the cyclone 4 is a scroll type cyclone 4.
More specifically, the system further comprises a material returning device 14, wherein the feeding end of the material returning device 14 is connected with the ash discharging end of the cyclone separator 4, and the discharging end of the material returning device 14 is connected with the combustion furnace 1. Therefore, the ash separated from the cyclone separator 4 can be introduced into the combustion furnace 1 again for combustion, and the combustion utilization rate of the materials is improved. Specifically, the existing material returning device 14 can be used as the material returning device 14.
The above-mentioned specific embodiments can not be regarded as the restriction to the scope of protection of the utility model, to technical personnel in this technical field, it is right the utility model discloses any replacement improvement or transform that embodiment made all fall within the scope of protection of the utility model.
The parts of the present invention not described in detail are the known techniques of those skilled in the art.
Claims (9)
1. The circulating fluidized bed boiler low-nitrogen combustion system is characterized by comprising:
A combustion furnace;
the air distribution plate is arranged at the lower section of the inner side of the combustion furnace, a plurality of air caps are arranged on the air distribution plate, and an air inlet is arranged on the combustion furnace at the lower side of the air distribution plate;
The inlet of the cyclone separator is connected with the combustion furnace, and the flue gas outlet is connected with a waste heat boiler;
The outlet end of the primary air supply pipe is communicated with the air inlet, and the inlet end of the primary air supply pipe is connected with the exhaust port of the waste heat boiler and natural air.
2. the circulating fluidized bed boiler low-nitrogen combustion system of claim 1, wherein: the wind hoods are arranged on the wind distribution plate in an array manner, and the wind distribution plate is provided with a slag falling pipe;
And dividing the area on the air distribution plate close to the outer edge of the air distribution plate and the area close to the slag falling pipe into a first air cap arrangement area, dividing the area on the air distribution plate outside the first air cap arrangement area into a second air cap arrangement area, wherein the ventilation resistance of the air cap in the first air cap arrangement area is smaller than that of the air cap in the second air cap arrangement area.
3. The circulating fluidized bed boiler low-nitrogen combustion system of claim 2, wherein: the aperture of the blast cap in the first blast cap arrangement area is larger than that of the blast cap in the second blast cap arrangement area.
4. The circulating fluidized bed boiler low-nitrogen combustion system of claim 1, wherein: the combustion furnace on the upper side of the air distribution plate is provided with at least two oppositely arranged secondary air supply joints a and at least two oppositely arranged secondary air supply joints b, and the secondary air supply joints a and the secondary air supply joints b are positioned at different heights on the combustion furnace;
The system also comprises a secondary air supply pipe, wherein the air inlet end of the secondary air supply pipe is connected with natural air, and the outlet end of the secondary air supply pipe is connected with each secondary air supply joint a and each secondary air supply joint b.
5. the circulating fluidized bed boiler low-nitrogen combustion system according to claim 4, characterized in that: the secondary air supply pipe is provided with an air preheater a, and the air preheater a is connected with an exhaust port of the waste heat boiler;
And/or an air preheater b is arranged on the primary air supply pipe and connected with an exhaust port of the waste heat boiler.
6. The circulating fluidized bed boiler low-nitrogen combustion system of claim 1, wherein: the bottom wall of the air inlet at the lower side of the air distribution plate is obliquely and upwards arranged along the air flow direction.
7. The circulating fluidized bed boiler low-nitrogen combustion system according to claim 4, characterized in that: the system also comprises a coal supply device, wherein a coal supply port connected with the coal supply device is arranged on the combustion furnace, and the coal supply port is arranged between the secondary air supply pipe and the air distribution plate.
8. The circulating fluidized bed boiler low-nitrogen combustion system of claim 1, wherein: the cyclone separator is a volute type cyclone separator.
9. The circulating fluidized bed boiler low-nitrogen combustion system of claim 1, wherein: the system also comprises a material returning device, wherein the feeding end of the material returning device is connected with the ash discharging end of the cyclone separator, and the discharging end of the material returning device is connected with the combustion furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920401511.2U CN209801470U (en) | 2019-03-26 | 2019-03-26 | low-nitrogen combustion system of circulating fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920401511.2U CN209801470U (en) | 2019-03-26 | 2019-03-26 | low-nitrogen combustion system of circulating fluidized bed boiler |
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| Publication Number | Publication Date |
|---|---|
| CN209801470U true CN209801470U (en) | 2019-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920401511.2U Expired - Fee Related CN209801470U (en) | 2019-03-26 | 2019-03-26 | low-nitrogen combustion system of circulating fluidized bed boiler |
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| CN (1) | CN209801470U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351032A (en) * | 2020-04-03 | 2020-06-30 | 杭州航民江东热电有限公司 | Boiler ash taking and returning circulation system |
-
2019
- 2019-03-26 CN CN201920401511.2U patent/CN209801470U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351032A (en) * | 2020-04-03 | 2020-06-30 | 杭州航民江东热电有限公司 | Boiler ash taking and returning circulation system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |