CN205007831U - Coal fired boiler SCR deNOx systems - Google Patents

Coal fired boiler SCR deNOx systems Download PDF

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Publication number
CN205007831U
CN205007831U CN201520602063.4U CN201520602063U CN205007831U CN 205007831 U CN205007831 U CN 205007831U CN 201520602063 U CN201520602063 U CN 201520602063U CN 205007831 U CN205007831 U CN 205007831U
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China
Prior art keywords
scr
calcium hydroxide
coal
slaked lime
flue
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CN201520602063.4U
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Chinese (zh)
Inventor
韩冰
刘伟
陈勇
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Nanjing Zhongdian Environmental Protection Technology Co Ltd
Nanjing Cec Environmental Protection Co Ltd
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Nanjing Zhongdian Environmental Protection Technology Co Ltd
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Abstract

The utility model discloses a coal fired boiler SCR deNOx systems, include slaked lime injection system, spout ammonia device and SCR reactor, SCR reactor portion is equipped with rectifier, soot blower and catalyst module, it installs and spouts ammonia device and SCR reactor to install earlier slaked lime injection system in coal fired boiler flue flue gas inlet department, slaked lime injection system include temperature measuring device, SO3 detection device and be equipped with a plurality of just to flue gas flow's slaked lime injection nozzle. The effect of slaked lime is the SO3 who absorbs in the flue gas, avoids under 160-280 DEG C of conditions of low temperature, and SO3 generates the ammonium hydrogen sulfate with the NH3 reaction and blocks up catalyst and air preheater, causes system performance to descend. The advantage of this SCR system not be for need setting up the bypass, can be under boiler low -load or flue -gas temperature be less than 300 DEG C the condition steady operation.

Description

A kind of coal-burning boiler SCR denitration system
Technical field
The utility model relates to a kind of SCR denitration system of coal-fired plant flue gas.
Background technology
At present, coal-burning power plant is the largest source of discharged nitrous oxides, from " thermal power plant's air pollution emission standard-2011 " to " coal electricity energy-saving and emission-reduction upgrading action technology (2014-2020) ", the denitration work of coal-burning power plant starts comprehensively, and country has reached very harsh stage to the pollution emission control of coal-burning power plant.
Because existing SCR denitration technology (middle temperature gametic fertility) has strong adaptability, efficiency high, is widely used in coal unit.The normal reaction temperature of SCR is at 280 ~ 420 DEG C, if flue-gas temperature is lower than 280 DEG C, reaction efficiency can reduce greatly, its main cause is that SO3 and NH3 reacts at low temperatures and generates the material ammonium hydrogen sulfate of viscosity, ammonium hydrogen sulfate meeting blocking catalyst duct, the active surface of covering catalyst, reduce the performance of catalyst, ammonium hydrogen sulfate also can enter preheater simultaneously, causes preheater to block, and resistance increases.So power plant is when boiler at low load or flue-gas temperature are lower than 300 DEG C, all select stoppage in transit SCR system, flue gas by-passing, cause outlet nitrous oxides concentration to exceed standard.
Utility model content
Problem to be solved in the utility model is exactly, provide a kind of can the SCR denitration system of still stable operation in boiler at low load or flue-gas temperature are lower than 300 DEG C of situations.
For the technical scheme solved the problems of the technologies described above is, a kind of fire coal boiler fume SCR denitration system, comprises calcium hydroxide spraying system, ammonia-gas spraying device and SCR reactor; SCR inside reactor is provided with rectifier, soot blower and catalyst module; First install calcium hydroxide spraying system in coal-burning boiler flue gas import department and install ammonia-gas spraying device and SCR reactor again, described calcium hydroxide spraying system comprises temperature measuring equipment, SO 3checkout gear is also provided with several just to the calcium hydroxide injection nozzle of flue gas flow direction.
The application can according to SO in flue-gas temperature and flue gas 3the size automatic decision of concentration is the need of the amount spraying into calcium hydroxide and calcium hydroxide.The effect of calcium hydroxide absorbs the SO in flue gas 3,
The entrance of SCR reactor 5 is provided with deflector 3.
Calcium hydroxide is calcium hydroxide suspension or calcium hydroxide solid particle.The specific area of described hydrated lime particle is 28 ~ 40cm 2/ g.
The effect of calcium hydroxide absorbs the SO3 in flue gas, avoids under cryogenic, and SO3 and NH3 reaction generates ammonium hydrogen sulfate blocking catalyst and air preheater, causes systematic function to decline.The advantage of this system is can continue when boiler at low load (flue-gas temperature is lower than 300 DEG C) to run SCR reactor.
The beneficial effects of the utility model, the utility model is fully beneficial to SCR denitration technology and has strong adaptability, efficiency high, make power plant when boiler at low load or flue-gas temperature are lower than 300 DEG C, still select SCR system, can not react because of SO3 and NH3 at low temperatures and generate the material ammonium hydrogen sulfate of viscosity, ammonium hydrogen sulfate meeting blocking catalyst duct, the active surface of covering catalyst, reduce the performance of catalyst, the utility model can according to the size automatic decision of SO3 concentration in flue-gas temperature and flue gas the need of the amount spraying into calcium hydroxide and calcium hydroxide.Efficiency cost more can control.This programme is avoided under low temperature 160 ~ 280 DEG C of conditions, and SO3 and NH3 reaction generates ammonium hydrogen sulfate blocking catalyst and air preheater, causes systematic function to decline.The advantage of this SCR system, can in boiler at low load or flue-gas temperature lower than stable operation when 300 DEG C for not need to arrange bypass.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model fire coal boiler fume SCR denitration system.
Detailed description of the invention
In Fig. 1, a kind of fire coal boiler fume SCR denitration system of the utility model, it mainly comprises calcium hydroxide spraying system 1, ammonia-gas spraying device 2, rectifier 4 and SCR reactor 5.Calcium hydroxide spraying system 1 is arranged on the air inlet flue before ammonia-gas spraying device 2, described calcium hydroxide spraying system 1 comprise temperature measuring equipment, SO3 checkout gear, several just to the nozzle and control system etc. of flue gas flow direction, it can according to the size automatic decision of SO3 concentration in flue-gas temperature and flue gas the need of the amount spraying into calcium hydroxide and calcium hydroxide.The effect of calcium hydroxide absorbs the SO3 in flue gas, avoids under cryogenic, and SO3 and NH3 reaction generates ammonium hydrogen sulfate blocking catalyst and air preheater, causes systematic function to decline.The entrance of SCR reactor 5 is provided with deflector 3, SCR inside reactor and is respectively equipped with rectifier 4, dedusting and soot blower 6 and catalyst module 7.When boiler at low load or flue-gas temperature are lower than 300 DEG C, the SO3 in flue gas has precedence over calcium hydroxide and reacts and absorbed, and then enters SCR system and deviates from nitrogen oxide.The advantage of this system is to establish bypass, reduces investment outlay, and denitrating system can ensure outlet nitrous oxides concentration qualified discharge in boiler arbitrary load situation.Be provided with deduster after calcium hydroxide spraying system, deduster is sack cleaner, electric cleaner or ceramic filter.SCR reactor is provided with and feeds in raw material and the hole of discharging for catalyst.
The foregoing is only more excellent embodiment of the present utility model; not in order to limit the utility model; any amendment in all institute dwellings within spirit of the present utility model and principle, equivalent replacement and improvement etc., all should within protection category of the present utility model.

Claims (4)

1. a coal-burning boiler SCR denitration system, is characterized in that comprising calcium hydroxide spraying system, ammonia-gas spraying device and SCR reactor; SCR inside reactor is provided with rectifier, soot blower and catalyst module; First install calcium hydroxide spraying system in coal-burning boiler flue gas import department and install ammonia-gas spraying device and SCR reactor again, described calcium hydroxide spraying system comprises temperature measuring equipment, SO 3checkout gear is also provided with several just to the calcium hydroxide injection nozzle of flue gas flow direction.
2. a kind of coal-burning boiler SCR denitration system according to claim 1, is characterized in that the entrance of described SCR reactor is provided with deflector.
3. a kind of coal-burning boiler SCR denitration system according to claim 1, is provided with deduster after it is characterized in that calcium hydroxide spraying system, and deduster is sack cleaner, electric cleaner or ceramic filter.
4. a kind of coal-burning boiler SCR denitration system according to claim 1, is characterized in that SCR reactor is provided with and feeds in raw material and the hole of discharging for catalyst.
CN201520602063.4U 2015-08-11 2015-08-11 Coal fired boiler SCR deNOx systems Active CN205007831U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520602063.4U CN205007831U (en) 2015-08-11 2015-08-11 Coal fired boiler SCR deNOx systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520602063.4U CN205007831U (en) 2015-08-11 2015-08-11 Coal fired boiler SCR deNOx systems

Publications (1)

Publication Number Publication Date
CN205007831U true CN205007831U (en) 2016-02-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105879641A (en) * 2016-06-02 2016-08-24 北京国电龙源环保工程有限公司 Device and method for removing sulfur trioxide through alkali liquor jet atomization
CN106422543A (en) * 2016-12-01 2017-02-22 山东天力节能环保工程有限公司 Gas-solid separator, as well as denitration and dust-removing device
CN106838945A (en) * 2016-12-21 2017-06-13 嘉兴新嘉爱斯热电有限公司 A kind of Optimization-type boiler environmental protection island system
CN107661693A (en) * 2016-07-28 2018-02-06 哈尔滨博深科技发展有限公司 A kind of method and combined system of the flue gas denitrification system stable operations of SCR in low- load conditions
CN113731113A (en) * 2021-09-15 2021-12-03 北京工大环能科技有限公司 System for reducing blockage of ammonium bisulfate of air preheater of coal-fired power plant

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105879641A (en) * 2016-06-02 2016-08-24 北京国电龙源环保工程有限公司 Device and method for removing sulfur trioxide through alkali liquor jet atomization
CN107661693A (en) * 2016-07-28 2018-02-06 哈尔滨博深科技发展有限公司 A kind of method and combined system of the flue gas denitrification system stable operations of SCR in low- load conditions
CN106422543A (en) * 2016-12-01 2017-02-22 山东天力节能环保工程有限公司 Gas-solid separator, as well as denitration and dust-removing device
CN106422543B (en) * 2016-12-01 2019-01-22 山东天力节能环保工程有限公司 A kind of gas-solid separator and its denitration dust collecting device
CN106838945A (en) * 2016-12-21 2017-06-13 嘉兴新嘉爱斯热电有限公司 A kind of Optimization-type boiler environmental protection island system
CN113731113A (en) * 2021-09-15 2021-12-03 北京工大环能科技有限公司 System for reducing blockage of ammonium bisulfate of air preheater of coal-fired power plant

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