CN204699575U - The flue gas combined denitrating system of a kind of cement kiln SNCR-SCR - Google Patents

The flue gas combined denitrating system of a kind of cement kiln SNCR-SCR Download PDF

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Publication number
CN204699575U
CN204699575U CN201520179837.7U CN201520179837U CN204699575U CN 204699575 U CN204699575 U CN 204699575U CN 201520179837 U CN201520179837 U CN 201520179837U CN 204699575 U CN204699575 U CN 204699575U
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China
Prior art keywords
scr
sncr
flue gas
reducing agent
cement kiln
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Expired - Fee Related
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CN201520179837.7U
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Chinese (zh)
Inventor
廖玉云
曹宗平
毛志伟
程群
甘昊
邓飞飞
王梦瑜
王晓琳
张立伟
郭新干
唐旻昊
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Hefei Cement Research and Design Institute Co Ltd
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Hefei Cement Research and Design Institute Co Ltd
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Abstract

The utility model discloses the flue gas combined denitrating system of a kind of cement kiln SNCR-SCR, comprise the SNCR denitration device being arranged at flue gas upstream and the SCR denitration device being arranged at flue gas downstream, SNCR and SCR denitration system share reducing agent preparation system and control system supplied by reducing agent, SNCR denitration system injection of reducing agent injection device is arranged in the A place of cement decomposing furnace middle and upper part or the B place of uptake flue, makes full use of high-temperature flue gas and makes NOx in reducing agent and flue gas that denitrification reaction occur; C place on uptake flue between C1 and the C2 level cyclone cylinder that SCR denitration system injection of reducing agent injection device is arranged in kiln tail preheater topmost.Adopt reducing agent pyrolysis or evaporation equipment in the existing SNCR-SCR combined denitration system of this injection apparatus arrangement economization, optimize spraying system, simplify denitrating technique, reduce cost of investment.

Description

The flue gas combined denitrating system of a kind of cement kiln SNCR-SCR
Technical field
The utility model relates to denitrating flue gas field, particularly relates to the flue gas combined denitrating system of a kind of cement kiln SNCR-SCR.
Background technology
Coal combustion discharge nitrogen oxide (NOx) in waste gas, be one of main source of atmospheric pollution.At present, the discharge of China's cement industry nitrogen oxide accounts for about 10% of total release, is the third-largest discharged nitrous oxides source of China.
National airborne release Target of Total Pollutant Amount Control during NOx lists in " 12 ", the overall goal that " 12 " last NOx reduces discharging cuts down 25%, one of cement furnace denitration keypoint treatment field becoming environmental protection on the basis of 2010.Regulation in " cement industry atmosphere pollutants emission standards " (GB4915-2013) of up-to-date promulgation: newly-built enterprise rises on March 1st, 2014, and existing enterprise rises on July 1st, 2015, performs kiln tail NOx emission concentration and is not more than 400mg/Nm 3regulation, key area performs NOx emission concentration and is not more than 320mg/Nm 3regulation.Present stage, implementing SNCR denitration technology and can meet China's most of cement production enterprise NOx emission concentration problem not up to standard, because the SNCR denitration technique construction period is short, reduced investment, denitration efficiency are high, is the mainstream technology of current domestic cement industry denitration.And China's cement industry closeness is high, commercial scale is large, and as main nitrogen oxide industrial emission source, carrying out than international tighter denitration standard, will be following inexorable trend.Increasingly harsh along with Environmental Protection in China standard, though SNCR technique can meet denitration demand instantly, but when future standard improves again, SNCR denitration technology reaches higher efficiency by being difficult to, and the too high consumption of ammonia that causes of SNCR denitration efficiency can be multiplied, secondary pollution aggravates, and therefore actively will find the NO_x Reduction by Effective new technology of applicable cement kiln specific run environment.
SNCR-SCR combined denitration technology has the advantages such as denitration efficiency is high, catalyst amount is little, SCR reactor volume is little.When single SNCR technique denitration efficiency can not meet requirement, SNCR-SCR technique can obtain the denitration efficiency (more than 85%) equally high with SCR technique.Process integration, owing to first have employed the preliminary denitration of SNCR technique, reduces the dependence to catalyst.Compared with SCR technique, the catalyst amount of process integration can greatly reduce.But in order to obtain NO_x Reduction by Effective reaction, requiring that the ammonia that sprays into has good contact with the NOx in flue gas and forms the concentration field be evenly distributed, therefore needing the ammonia injection grid mixing facility etc. installing complexity additional.Simultaneously existing using ammoniacal liquor or urea liquid as the SNCR-SCR denitrating system of reducing agent, due to the high oxidization rate of ammonia under the restriction of temperature window structure and high temperature, cause the decline of denitration efficiency, general in order to improve denitration efficiency, ammoniacal liquor evaporation or urea pyrolysis equipment need be set up, this just makes the complex structure of denitrating system, also substantially increases cost.
Utility model content
The purpose of this utility model is exactly to provide the flue gas combined denitrating system of a kind of cement kiln SNCR-SCR, and the need overcoming existing denitrating system arrange baroque reducing agent and flue gas mixing apparatus, reducing agent evaporate and pyrolysis plant and the high problem of cost of investment.
The utility model solves the technical scheme that its technical problem adopts:
The flue gas combined denitrating system of a kind of cement kiln SNCR-SCR, comprise the SNCR denitration device being arranged at flue gas upstream and the SCR denitration device being arranged at flue gas downstream, SNCR system injection apparatus 7 is arranged at the B place on A place, cement decomposing furnace 1 middle and upper part or top exhanst gas outlet flue 5, the C place on the uptake flue 6 between C1 and the C2 level cyclone cylinder that SCR system injection apparatus 8 is arranged at cement kiln end preheater 2 topmost.
Described SNCR and SCR denitration device share reducing agent preparation system 3 and control system 4 supplied by reducing agent, can control the injection flow of reducing agent.
Described reducing agent can be ammoniacal liquor, urea liquid or liquefied ammonia;
In SNCR denitration process, the reducing agent of non-complete reaction can continue to participate in reaction in SCR denitration device.
Described SNCR system injection apparatus 7 and SCR system injection apparatus 8 are twin spray gun, and comprise atomizer, and spray gun can be automatic telescopic or fixed, and atomizing medium is the compressed air of 0.3 ~ 0.6MPa.
Be provided with cooling air sleeve outside described SNCR system injection apparatus 7 and the spray gun of SCR system injection apparatus 8, sleeve is provided with compressed air inlet, can be used for cooling described spray gun.
Have wear-resistant protection cover before the atomizer of described SNCR system injection apparatus 7 and the spray gun of SCR system injection apparatus 8, wear-resistant protection cover is silicon carbide material.
Described SCR reactor 9 inlet flue gas is drawn from the flue after kiln tail preheater 2, and exiting flue gas is got back on the flue before kiln tail high-temperature blower 11.
Described SCR reactor 9 exports coupling high-temperature blower 10, for compensating the pressure loss that SCR reactor brings, makes the negative pressure of quality coal in cement kiln systems unaffected.
Described SCR reactor import and export flue is all arranged the first butterfly valve 12, second butterfly valve 13, the 3rd butterfly valve 14, reducible former flue system when not using SCR system.
The utility model has the advantages that: cement kiln adopts SNCR-SCR combined denitration system synthesis denitration efficiency to reach more than 85%, and amount of ammonia slip is less than 3ppm, is applicable to the NOx concentration emission request that cement kiln is increasingly strict.The SNCR system injection apparatus of process integration is arranged on cement decomposing furnace middle and upper part or top exhanst gas outlet flue, on uptake flue between C1 and C2 level cyclone cylinder SCR system injection apparatus being arranged at cement kiln end preheater topmost, in SNCR denitration process, the reducing agent of non-complete reaction can continue to participate in reaction in SCR denitration device, and with the SCR reactor in downstream apart from far.Therefore, spraying grid mixing facility without the need to installing complicated ammonia again additional, also without the need to lengthening flue, just can obtain reducing agent at hydrogen-catalyst reactor entrance and mixing and distribution with the good of NOx, being conducive to improving denitration efficiency, the escaping of ammonia rate is reduced.Adopt reducing agent pyrolysis or evaporation equipment in the existing SNCR-SCR combined denitration system of this injection apparatus arrangement economization, optimize spraying system, simplify denitrating technique, reduce cost of investment.
Accompanying drawing illustrates:
Fig. 1 is the flue gas combined denitrating system schematic diagram of the utility model cement kiln SNCR-SCR.
Number in the figure: uptake flue, 7-SNCR system injection apparatus, 8-SCR system injection apparatus, 9-SCR reactor, 10-cement kiln end high-temperature blower, 11-SCR system-specific high-temperature blower, 12-first butterfly valve, 13-second butterfly valve, 14-the 3rd butterfly valve between 1-cement decomposing furnace, 2-kiln tail preheater, 3-reducing agent preparation system, 4-reducing agent supply control system, 5-dore furnace top exit flue, 6-C1 and C2 level cyclone cylinder.
Detailed description of the invention:
The flue gas combined denitrating system of a kind of cement kiln SNCR-SCR, comprise the SNCR denitration device being arranged at flue gas upstream and the SCR denitration device being arranged at flue gas downstream, SNCR system injection apparatus 7 is arranged at the B place on A place, cement decomposing furnace 1 middle and upper part or top exhanst gas outlet flue 5, the C place on the uptake flue 6 between C1 and the C2 level cyclone cylinder that SCR system injection apparatus 8 is arranged at cement kiln end preheater 2 topmost.
SNCR and SCR denitration device share reducing agent preparation system 3 and control system 4 supplied by reducing agent, can control the injection flow of reducing agent.Reducing agent can be ammoniacal liquor, urea liquid or liquefied ammonia; In SNCR denitration process, the reducing agent of non-complete reaction can continue to participate in reaction in SCR denitration device.SNCR system injection apparatus 7 and SCR system injection apparatus 8 are twin spray gun, and comprise atomizer, and spray gun can be automatic telescopic or fixed, and atomizing medium is the compressed air of 0.3 ~ 0.6MPa.Be provided with cooling air sleeve outside the spray gun of SNCR system injection apparatus 7 and SCR system injection apparatus 8, sleeve is provided with compressed air inlet, can be used for cooling described spray gun.Have wear-resistant protection cover before the atomizer of the spray gun of SNCR system injection apparatus 7 and SCR system injection apparatus 8, wear-resistant protection cover is silicon carbide material.SCR reactor 9 inlet flue gas is drawn from the flue after kiln tail preheater 2, and exiting flue gas is got back on the flue before kiln tail high-temperature blower 11.SCR reactor 9 exports coupling high-temperature blower 10, for compensating the pressure loss that SCR reactor brings, makes the negative pressure of quality coal in cement kiln systems unaffected.SCR reactor import and export flue is all arranged the first butterfly valve 12, second butterfly valve 13, the 3rd butterfly valve 14, reducible former flue system when not using SCR system.

Claims (10)

1. the flue gas combined denitrating system of cement kiln SNCR-SCR, it is characterized in that: comprise the SNCR denitration device being arranged at flue gas upstream and the SCR denitration device being arranged at flue gas downstream, SNCR system injection apparatus (7) is arranged at the B place on A place, cement decomposing furnace (1) middle and upper part or top exhanst gas outlet flue (5), the C place on the uptake flue (6) between C1 and the C2 level cyclone cylinder that SCR system injection apparatus (8) is arranged at cement kiln end preheater (2) topmost.
2. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 1, it is characterized in that: described SNCR and SCR denitration device share reducing agent preparation system (3) and control system (4) supplied by reducing agent, can control the injection flow of reducing agent.
3. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 2, is characterized in that: described reducing agent is ammoniacal liquor, urea liquid or liquefied ammonia.
4. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 1, is characterized in that: in SNCR denitration process, the reducing agent of non-complete reaction can continue to participate in reaction in SCR denitration device.
5. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 1, it is characterized in that: described SNCR system injection apparatus (7) and SCR system injection apparatus (8) are twin spray gun, and comprise atomizer, spray gun is automatic telescopic or fixed, and atomizing medium is the compressed air of 0.3 ~ 0.6MPa.
6. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 1, it is characterized in that: outside described SNCR system injection apparatus (7) and the spray gun of SCR system injection apparatus (8), be provided with cooling air sleeve, sleeve is provided with compressed air inlet, can be used for cooling described spray gun.
7. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 1; it is characterized in that: have wear-resistant protection cover before the atomizer of described SNCR system injection apparatus (7) and the spray gun of SCR system injection apparatus (8), wear-resistant protection cover is silicon carbide material.
8. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 1, it is characterized in that: described SCR reactor (9) inlet flue gas is drawn from the flue after kiln tail preheater (2), and exiting flue gas is got back on the flue before kiln tail high-temperature blower (11).
9. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 1, it is characterized in that: described SCR reactor (9) outlet coupling has high-temperature blower (10), for compensating the pressure loss that SCR reactor brings, make the negative pressure of quality coal in cement kiln systems unaffected.
10. the flue gas combined denitrating system of cement kiln SNCR-SCR according to claim 1, it is characterized in that: described SCR reactor import and export flue is all arranged the first butterfly valve (12), the second butterfly valve (13), the 3rd butterfly valve (14), reducible former flue system when not using SCR system.
CN201520179837.7U 2015-03-28 2015-03-28 The flue gas combined denitrating system of a kind of cement kiln SNCR-SCR Expired - Fee Related CN204699575U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105457478A (en) * 2016-01-04 2016-04-06 中材国际环境工程(北京)有限公司 Cement kiln smoke ammonia desulfurization system and method
CN105889975A (en) * 2016-04-18 2016-08-24 廖引家 NOx emission reduction method for cement plant
CN105983338A (en) * 2016-02-29 2016-10-05 合肥水泥研究设计院 Gasification/mixing all-in-one device for SCR (Selective Catalytic Reduction) flue gas denitrification reducing agent of cement kiln
CN106166437A (en) * 2016-07-21 2016-11-30 南京西普环保科技有限公司 A kind of cement kiln flue gas desulphurization system and method
CN109464900A (en) * 2018-12-12 2019-03-15 深圳市能源环保有限公司 The spray gun control method of SNCR denitration in a kind of garbage incinerating power plant furnace

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105457478A (en) * 2016-01-04 2016-04-06 中材国际环境工程(北京)有限公司 Cement kiln smoke ammonia desulfurization system and method
CN105983338A (en) * 2016-02-29 2016-10-05 合肥水泥研究设计院 Gasification/mixing all-in-one device for SCR (Selective Catalytic Reduction) flue gas denitrification reducing agent of cement kiln
CN105889975A (en) * 2016-04-18 2016-08-24 廖引家 NOx emission reduction method for cement plant
CN106166437A (en) * 2016-07-21 2016-11-30 南京西普环保科技有限公司 A kind of cement kiln flue gas desulphurization system and method
CN106166437B (en) * 2016-07-21 2019-02-12 南京西普环保科技有限公司 A kind of cement kiln flue gas desulphurization system and method
CN109464900A (en) * 2018-12-12 2019-03-15 深圳市能源环保有限公司 The spray gun control method of SNCR denitration in a kind of garbage incinerating power plant furnace

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Granted publication date: 20151014

Termination date: 20180328