CN204933244U - NOx removal device in coal-burning power plant's coal-powder boiler flue gas - Google Patents
NOx removal device in coal-burning power plant's coal-powder boiler flue gas Download PDFInfo
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- CN204933244U CN204933244U CN201520633264.0U CN201520633264U CN204933244U CN 204933244 U CN204933244 U CN 204933244U CN 201520633264 U CN201520633264 U CN 201520633264U CN 204933244 U CN204933244 U CN 204933244U
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- coal
- flue gas
- powder boiler
- reducing agent
- power plant
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000003546 flue gas Substances 0.000 title claims abstract description 65
- 239000000843 powder Substances 0.000 title claims abstract description 42
- 229910002089 NOx Inorganic materials 0.000 title claims abstract 12
- 239000003638 reducing agent Substances 0.000 claims abstract description 57
- 230000000694 effects Effects 0.000 claims abstract description 37
- 239000007921 spray Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 6
- 230000037250 Clearance Effects 0.000 abstract description 10
- 230000035512 clearance Effects 0.000 abstract description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 78
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 40
- 229910052813 nitrogen oxide Inorganic materials 0.000 description 39
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000003054 catalyst Substances 0.000 description 6
- 239000002817 coal dust Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZFSLODLOARCGLH-UHFFFAOYSA-N Cyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M NaHCO3 Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 1
- 210000001138 Tears Anatomy 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000002708 enhancing Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine hydrate Chemical class O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Abstract
The utility model belongs to the technical field of denitrating flue gas.In order to solve the poor stability of current coal-burning power plant coal-powder boiler flue gas denitrification system, expensive and inefficient problem, the utility model proposes the NOx removal device in a kind of coal-burning power plant coal-powder boiler flue gas, comprise the reducing agent be arranged in coal-powder boiler flue and spray into distribution apparatus and mixing reactor, high activity reducing agent sprays into distribution apparatus by described reducing agent and sprays in described mixing reactor; Described reducing agent sprays into distribution apparatus and comprises nozzle, the material storage tank that this nozzle deposits high activity reducing agent by pipeline and coal-powder boiler is connected, the high temperature superheater import department of this nozzle in coal-powder boiler flue, between high temperature superheater and high temperature reheater or high temperature reheater exit; Described mixing reactor comprises several venturi mixing tube be arranged in parallel.The utility model simplifies the structure of denitrating system, reduces cost of investment and operating cost, improves the clearance of NOx in flue gas.
Description
Technical field
The utility model belongs to the technical field of denitrating flue gas, is specifically related to the NOx removal device in a kind of coal-burning power plant coal-powder boiler flue gas.
Background technology
The boiler plant of coal-powder boiler to be a kind of with coal dust be fuel, efficiency of fire coal is high, is widely used in coal-burning power plant.The flue gas that in coal-powder boiler, coal dust firing produces contains a large amount of nitrogen oxide (NOx), can cause the problem such as acid rain and depletion of the ozone layer, cause severe contamination to environment in these discharged nitrous oxides to air.According to the requirement of " fossil-fuel power plant atmospheric pollutant emission standard " (GB12332-2011), coal-fired plant boiler NOx emission concentration limit is at 100mg/m3, since this standard performs, most of coal-burning power plant has taked selective catalytic reduction (SelectiveCatalyticReduction, be called for short SCR) and/or SNCR method (SelectiveNon-CatalyticReduction, be called for short SNCR) discharge of NOx is controlled.
The know-why of SCR is in flue gas, add reducing agent (the most frequently used is ammonia and ammoniacal liquor), and under the conditions such as catalyst and suitable temperature, the NOx in reducing agent and flue gas reacts, and generates harmless nitrogen and water; In practical application, SCR system mainly comprises catalytic reactor, catalyst layer, reducing agent storage device and injection apparatus, but easily block due to catalyst layer and wear and tear, cause whole SCR system less stable, and catalyst is expensive, make whole SCR system cost of investment and operating cost all very high.The principle of SNCR technology utilizes ammoniacal liquor or urea etc. as reducing agent, this reducing agent is atomized, reducing agent after atomization reacts with flue gas in suitable temperature range, generate harmless nitrogen and water, but use the efficiency of NOx in SNCR technology removal flue gas lower at present, the requirement of coal-burning power plant can not be met.
Utility model content
In order to solve the poor stability of current coal-burning power plant coal-powder boiler flue gas denitrification system, expensive and inefficient problem, the utility model proposes the NOx removal device in a kind of coal-burning power plant coal-powder boiler flue gas, to reduce the cost of coal-burning power plant's coal-powder boiler flue gas denitrification system, improve the clearance of NOx in coal-burning power plant's coal-powder boiler flue gas.
NOx removal device in the utility model coal-burning power plant coal-powder boiler flue gas comprises the reducing agent be arranged in coal-powder boiler flue and sprays into distribution apparatus and mixing reactor, and high activity reducing agent sprays into distribution apparatus by described reducing agent and sprays in described mixing reactor; Described reducing agent sprays into distribution apparatus and comprises nozzle, the material storage tank that this nozzle deposits high activity reducing agent by pipeline and coal-powder boiler is connected, the high temperature superheater import department of this nozzle in coal-powder boiler flue, between high temperature superheater and high temperature reheater or high temperature reheater exit; Described mixing reactor comprises several venturi mixing tube be arranged in parallel.
Wherein, the nozzle that described reducing agent sprays into distribution apparatus is connected with distributor.
Wherein, described distributor is gas grid or gas distribution grid.
Wherein, described distributor is positioned at the porch of described mixing reactor.
Wherein, described nozzle is positioned at the trunnion place of described venturi mixing tube.
Wherein, described nozzle is multiple.
Wherein, described venturi mixing tube is provided with several trunnions.
Wherein, the length of side of described venturi mixing tube entrance is 0.5-6m.
Wherein, the trunnion of described venturi mixing tube is 1:10-1:3 with the ratio of the sectional area of entrance.
NOx removal device in the utility model coal-burning power plant coal-powder boiler flue gas has following beneficial effect:
Nozzle of the present utility model is in high temperature superheater import department, between high temperature superheater and high temperature reheater or high temperature reheater exit, because high temperature superheater import department, between high temperature superheater and high temperature reheater or the temperature in high temperature reheater exit be 600-1000 DEG C, under 600-1000 DEG C of environment, the NOx reaction rate in high activity reducing agent and flue gas is higher.By mixing reactor of the present utility model, the high activity reducing agent of nozzle ejection is more abundant with mixing of flue gas.The utility model makes NOx in high activity reducing agent and flue gas on the whole under the temperature environment be applicable to, and abundant hybrid reaction, improves the clearance of NOx in flue gas, prove through practical application, uses the clearance of NOx in the utility model flue gas to be greater than 80%.The utility model is applicable to large coal-fired power plant coal-powder boiler denitration (namely removing the NOx in flue gas), owing to not using expensive catalyst, does not also need catalyst layer, simplifies the structure of denitrating system, reduce cost of investment and operating cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the NOx removal device in the utility model coal-burning power plant coal-powder boiler flue gas, and wherein nozzle is positioned at high temperature superheater import department;
Fig. 2 is the structural representation of the NOx removal device in the utility model coal-burning power plant coal-powder boiler flue gas, and wherein nozzle is between high temperature superheater and high temperature reheater;
Fig. 3 is the structural representation of the NOx removal device in the utility model coal-burning power plant coal-powder boiler flue gas, and wherein nozzle is positioned at high temperature reheater exit;
Fig. 4 is the close-up schematic view of part A in Fig. 1;
Fig. 5 is the structural representation of venturi mixing tube of the present utility model;
Fig. 6 is the structural representation being provided with the venturi mixing tube of four trunnions of the present utility model;
Fig. 7 is the structural representation of the NOx removal device in the utility model coal-burning power plant coal-powder boiler flue gas, and wherein distributor is positioned at the porch of mixing reactor;
Fig. 8 is the structural representation of the NOx removal device in the utility model coal-burning power plant coal-powder boiler flue gas, and wherein nozzle is positioned at the trunnion place of venturi mixing tube.
Detailed description of the invention
The technical solution of the utility model is introduced below in conjunction with accompanying drawing.
As shown in Figure 1, the NOx removal device in coal-burning power plant's coal-powder boiler flue gas comprises reducing agent and sprays into distribution apparatus and mixing reactor 16, and reducing agent sprays into the flue 12 that distribution apparatus and mixing reactor 16 are all positioned at coal-powder boiler.Reducing agent sprays into distribution apparatus and comprises nozzle 14 and distributor 13, nozzle 14 is connected with the material storage tank 15 of coal-powder boiler, material storage tank 15 is for depositing high activity reducing agent, distributor 13 is connected with nozzle 14, high activity reducing agent is sprayed by nozzle 14 and sprays in mixing reactor 16 through distributor 13, the NOx abundant hybrid reaction in mixing reactor 16 in high activity reducing agent and flue gas; The high activity reducing agent that distributor 13 makes nozzle 14 spray is uniformly distributed in mixing reactor 16, and distributor 13 can be gas grid or gas distribution grid.Coal dust burns in burner hearth 11, and pressure fan 10 is blown in burner hearth 11, and to promote coal dust firing, the flue gas that coal dust firing produces is discharged along flue 12.High temperature superheater 17 and high temperature reheater 18 is provided with in the flue 12 of coal-powder boiler, nozzle 14 can be positioned at high temperature superheater 17 import department, also between high temperature superheater 17 and high temperature reheater 18, can see Fig. 2, high temperature reheater 18 exit can also be positioned at, see Fig. 3.
As shown in Figure 4, nozzle 14 is connected with distributor 13, and what distributor 13 can be positioned at mixing reactor 16 enters epistome, and mixing reactor 16 comprises several venturi mixing tube 20, and these several venturi mixing tube 20 are arranged in parallel in flue 12.Several venturi mixing tube 20 parallel connections can be as shown in Figure 4, and 4 venturi mixing tube 20 are in parallel in the mode of 2*2, and namely 4 venturi mixing tube 20 form a square, and this foursquare every bar limit comprises 2 venturi mixing tube 20; Several venturi mixing tube 20 parallel connections can also be that 36 venturi mixing tube 20 are in parallel in the mode of 6*6, namely 36 venturi mixing tube 20 form a square, this foursquare every bar limit comprises 6 venturi mixing tube 20, and the concrete number of venturi mixing tube 20 is determined according to the size of flue 12.As shown in Figure 5, venturi mixing tube 20 comprises entrance 21, trunnion 22 and diffuser 23, and entrance 21 is square, and diffuser 23 is circular.Wherein, venturi mixing tube 20 can be provided with one or more trunnion 22, as shown in Figure 6, venturi mixing tube 20 is provided with four trunnions 22, venturi mixing tube 20 is provided with the mixing intensity that multiple trunnion 22 can increase high activity reducing agent and flue gas, high activity reducing agent is mixed more abundant with flue gas.
The reaction needed of NOx in the high activity reducing agent that nozzle 14 sprays and flue gas just has higher reaction rate at the temperature of 600-1000 DEG C, when environment temperature is higher than 1000 DEG C, the oxidation reaction of high activity reducing agent plays a leading role, have impact on the reaction of the NOx in high activity reducing agent and flue gas, the clearance of NOx reduces; When environment temperature is lower than 600 DEG C, the reaction rate of the NOx in high activity reducing agent and flue gas is very low, and environment temperature is very large for the clearance impact of NOx in flue gas as can be seen here.High temperature superheater 17 import department, between high temperature superheater 17 and high temperature reheater 18, the temperature of these three positions, high temperature reheater 18 exit is at 600-1000 DEG C, and temperature stabilization, do not have larger fluctuation, so nozzle 14 to be installed on any one in three above-mentioned positions, can ensure that the NOx reaction rate in the high activity reducing agent that nozzle 14 sprays and flue gas is very high, NOx in high activity reducing agent and flue gas fully reacts, and improves the clearance of NOx in flue gas.Wherein, high activity reducing agent refers to the reducing agent containing cyanuric acid, hydrazine hydrate class, also can contain the materials such as carbonic hydroammonium, urea, NaOH, sodium acid carbonate, pass through Geldart-D particle with fine powder form.
High activity reducing agent sprays in mixing reactor 16 by nozzle 14, the runner of mixing reactor 16 is narrow, in mixing reactor 16, high activity reducing agent and flue gas flow rate are all higher, the trunnion 22 place flue gas flow rate of such as venturi mixing tube 20 is at 30-60m/s, and the flow velocity of flue gas is less than 10m/s in flue 12, high activity reducing agent and flue gas flow rate are all higher which enhances flue gas and high activity reducing agent mixing intensity, high activity reducing agent is mixed more abundant with flue gas, thus the NOx in high activity reducing agent and flue gas reacts more abundant, improve the clearance of NOx in flue gas.
As shown in Figure 7, distributor 13 is positioned at the porch of mixing reactor 16, such high activity reducing agent directly enters in mixing reactor 16 after nozzle 14 and distributor 13 spray, ensure that high activity reducing agent enters the speed in mixing reactor 16, and substantially whole high activity reducing agents can enter in mixing reactor 16 with smoke reaction, improve the clearance of NOx in flue gas.The number of nozzle 14 can be multiple, such as a nozzle 14 can be set in the porch of each venturi mixing tube 20, when the quantity of nozzle 14 is more, high activity reducing agent is more evenly distributed in mixing reactor 16, is conducive to the abundant hybrid reaction of NOx in high activity reducing agent and flue gas.Wherein, the length of side of venturi mixing tube 20 entrance is 0.5-6m, and the trunnion 22 of venturi mixing tube 20 is 1:10-1:3 with the ratio of the sectional area of entrance 21.
As shown in Figure 8, nozzle 14 is not connected with distributor 13, but be positioned at trunnion 22 place of venturi mixing tube 20, the high activity reducing agent that nozzle 14 sprays enters venturi mixing tube 20 from trunnion 22, to react with the NOx in flue gas, such high activity reducing agent mixes more abundant with the flue gas flowing through at a high speed trunnion 22, high activity reducing agent and the high speed NOx flow through in the flue gas of trunnion 22 react more abundant, improve the clearance of NOx in flue gas.
Claims (9)
1. the NOx removal device in coal-burning power plant's coal-powder boiler flue gas, it is characterized in that, comprise the reducing agent be arranged in coal-powder boiler flue and spray into distribution apparatus and mixing reactor, high activity reducing agent sprays into distribution apparatus by described reducing agent and sprays in described mixing reactor; Described reducing agent sprays into distribution apparatus and comprises nozzle, the material storage tank that this nozzle deposits high activity reducing agent by pipeline and coal-powder boiler is connected, the high temperature superheater import department of this nozzle in coal-powder boiler flue, between high temperature superheater and high temperature reheater or high temperature reheater exit; Described mixing reactor comprises several venturi mixing tube be arranged in parallel.
2. the NOx removal device in coal-burning power plant according to claim 1 coal-powder boiler flue gas, it is characterized in that, the nozzle that described reducing agent sprays into distribution apparatus is connected with distributor.
3. the NOx removal device in coal-burning power plant according to claim 2 coal-powder boiler flue gas, it is characterized in that, described distributor is gas grid or gas distribution grid.
4. the NOx removal device in the coal-burning power plant's coal-powder boiler flue gas according to Claims 2 or 3, it is characterized in that, described distributor is positioned at the porch of described mixing reactor.
5. the NOx removal device in coal-burning power plant according to claim 1 coal-powder boiler flue gas, it is characterized in that, described nozzle is positioned at the trunnion place of described venturi mixing tube.
6. the NOx removal device in the coal-burning power plant's coal-powder boiler flue gas according to any one of claim 1-3, is characterized in that, described nozzle is multiple.
7. the NOx removal device in the coal-burning power plant's coal-powder boiler flue gas according to any one of claim 1-3, it is characterized in that, described venturi mixing tube is provided with several trunnions.
8. the NOx removal device in the coal-burning power plant's coal-powder boiler flue gas according to any one of claim 1-3, is characterized in that, the length of side of described venturi mixing tube entrance is 0.5-6m.
9. the NOx removal device in the coal-burning power plant's coal-powder boiler flue gas according to any one of claim 1-3, is characterized in that, the trunnion of described venturi mixing tube is 1:10-1:3 with the ratio of the sectional area of entrance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520633264.0U CN204933244U (en) | 2015-08-20 | 2015-08-20 | NOx removal device in coal-burning power plant's coal-powder boiler flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520633264.0U CN204933244U (en) | 2015-08-20 | 2015-08-20 | NOx removal device in coal-burning power plant's coal-powder boiler flue gas |
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| CN204933244U true CN204933244U (en) | 2016-01-06 |
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| CN201520633264.0U Active CN204933244U (en) | 2015-08-20 | 2015-08-20 | NOx removal device in coal-burning power plant's coal-powder boiler flue gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106492634A (en) * | 2016-11-30 | 2017-03-15 | 南京右转信息科技有限公司 | A kind of flue gas desulfurization and denitrification system |
| CN107998852A (en) * | 2018-01-24 | 2018-05-08 | 东莞市升佳净水材料有限公司 | A kind of solid denitrfying agent and preparation method thereof |
| CN114682088A (en) * | 2022-04-02 | 2022-07-01 | 大唐林州热电有限责任公司 | Ejector applied to matrix nozzle |
-
2015
- 2015-08-20 CN CN201520633264.0U patent/CN204933244U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106492634A (en) * | 2016-11-30 | 2017-03-15 | 南京右转信息科技有限公司 | A kind of flue gas desulfurization and denitrification system |
| CN107998852A (en) * | 2018-01-24 | 2018-05-08 | 东莞市升佳净水材料有限公司 | A kind of solid denitrfying agent and preparation method thereof |
| CN114682088A (en) * | 2022-04-02 | 2022-07-01 | 大唐林州热电有限责任公司 | Ejector applied to matrix nozzle |
| CN114682088B (en) * | 2022-04-02 | 2023-08-08 | 大唐林州热电有限责任公司 | Injector applied to matrix nozzle |
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