燃煤电厂湿法脱硫前逃逸氨迁移转化和脱除特性

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Abstract The ammonia composition and emission concentration in the flue gas at denitration outlet, air preheater outlet and dust remover outlet of three ultra-low emission coal-fired units were collected and analyzed by flue gas sampling method of stationary source, indophenol blue spectrophotometry and ion chromatography. Considering the characteristics of units operating conditions and flue gas treatment system, the migration, transtration and removal characteristics of escaped ammonia in air preheater and dust collector were studied. The results showed that the escaped ammonia at denitration outlet of all units was gaseous ammonia under high and low load operating conditions, and the distribution was uneven, with the ammonia emission concentration at typical locations higher than 2.5mg/m³. Gaseous ammonia begined to transform into filtrable ammonia when it flowed through the air preheater along with the flue gas. The filtrable ammonia emitted at the outlet of the air preheater could account for 47.21%~68.85% of the total ammonia. The temperature drop and flow velocity of flue gas in air preheater affected the generation of filtrable ammonia. The dust collector could remove most of the escaped ammonia, and the removal effect mainly came from the removal of filtrable ammonia. The removal performance of filtrable ammonia varied with dust collector systems. The escaped ammonia in the flue gas of dust remover outlet was mainly in the form of gaseous ammonia, and the concentration was between 0.15 and 0.60mg/m³.

Key words： coal-fired units ultra-low emission escaped ammonia composition migration and transformation removal

Received: 10 May 2023

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X511

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	Articles by authors
	ZHENG Cheng-qiang
	LI Xiao-long
	LIU Guang-xiang
	LI Jun-zhuang
	ZHOU Dao-bin
	DUAN Jiu-xiang
	ZHANG Hao-liang

Cite this article:

ZHENG Cheng-qiang,LI Xiao-long,LIU Guang-xiang等. Migration, transformation and removal characteristics of escapted ammonia before wet desulfurization in coal-fired power plants[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(1): 58-64.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I1/58

[1]	中国电力企业联合会.中国电力行业年度发展报告2022[R].北京:中国电力企业联合会, 2022.China Electricity Council.China electric power industry annual development report [R].Beijing:China Electricity Council, 2022.
[2]	程滕.SCR脱硝中形成的硫酸铵盐及逃逸氨在后续烟气系统中的迁移转化特性研究[D].南京:东南大学, 2020.Cheng T.Study on the migration and transformation characteristics of ammonium sulfates and ammonia slip formed in SCR in the subsequent flue gas system [D].Nanjing:Southeast University, 2020.
[3]	Peng Y, Si W, Li X, et al.Comparison of MoO3 and WO3 on arsenic poisoning V2O5/TiO2 catalyst:DRIFTS and DFT study [J].Applied Catalysis B:Environmental, 2016,181:692-698.
[4]	郑成强,李小龙,李军状,等.燃煤电厂逃逸氨迁移转化特性研究进展[J].化工进展, 2022,41:964-973.Zheng C Q, Li X L, Li J Z, et al.Research progress on migration and transformation characteristics of escaped ammonia in coal-fired power plants [J].Chemical Industry and Engineering Progress, 2022,41:964-973.
[5]	王圣.燃煤电厂非传统大气污染物控制展望[J].中国电力, 2018,51(8):173-179.Wang S.Prospects of non-traditional air pollutants control in coal-fired power plants [J].China Electric Power, 2018,51(8):173-179.
[6]	Wang Y B, Tan H Z, Dong K, et al.Study of ashfouling on the blade of induced fan in a 330MW coal-fired power plant with ultra-low pollutant emission [J].Applied Thermal Engineering, 2017,118:283-291.
[7]	冯前伟,张杨,王丰吉,等.燃煤机组SCR脱硝超低排放改造前后性能对比分析[J].中国电机工程学报, 2020,40(20):6644-6652.Feng Q W, Zhang Y, Wang F J, et al.Performance com-parison and analysis before and after SCR ultra-low emission transf-ormation of coal-fired units[J].Proceedings of the CSEE, 2020,40(20):6644-6652.
[8]	颜鲁,孙奉仲,郑鹏.脱硝伴生硫酸氢铵对空预器壁面粘附机理的实验研究[J].中国电机工程学报, 2020,40(20):6609-6616.Yan L, Sun F Z, Zheng P.Experimental study on the adhesion mechanism of ammonium bisulfate associated with denitration to the wall of air preheater [J].Proceedings of the CSEE, 2020,40(20):6609-6616.
[9]	颜鲁,李秀财,孙奉仲,等.SCR脱硝伴生硫酸氢铵对飞灰颗粒特性影响的实验研究[J].中国电机工程学报, 2019,39(10):2987-2993.Yan L, LI X C, Sun F Z, et al.Experimental study on the effect of ammonium bisulfate on particle characteristics of fly ash during the SCR denitrification process [J].Proceedings of the CSEE, 2019,39(10):2987-2993.
[10]	张玉华.燃煤烟气SCR脱硝对细颗粒物排放特性影响的试验研究[D].南京:东南大学, 2015.Zhang Y H.Investigation on the effects of SCR on emissioncharacteristics of PM2.5 from coal-fired flue gas [D].Nanjing:Southeast University, 2015.
[11]	Li Z, Jiang J, Ma Z, et al.Effect of selective catalytic reduction (SCR) on fine particle emission from two coal-fired power plants in China [J].Atmospheric Environment, 2015,120:227-233.
[12]	Zheng C Q, Li X L, Li J Z, et al.Investigation on the ammonia emission characteristics in coal-fired power plants of China [J].Fuel, 2022,314:123046.
[13]	李军状,杨勇平,朱法华,等.SCR高脱硝效率燃煤发电机组逃逸氨分布特性实测研究[J].中国电机工程学报, 2021,41(10):3447-3453,3670.Li J Z, Yang Y P, Zhu F H, et al.Actual measurement study on escaped ammonia distribution with SCR high denitration efficiency of coal-fired Unit [J].Proceedings of the CSEE, 2021,41(10):3447-3453,3670.
[14]	李小龙,朱法华,段玖祥,等.600MW燃煤机组逃逸氨迁移规律与排放特性[J].中国电机工程学报, 2021,41(19):6560-6570.Li X L, Zhu F H, Duan J X, et al.Migration law and emission characteristics of ammonia slip in a 600MW ultra-low emission coal-fired unit [J].Proceedings of the CSEE, 2021,41(19):6560-6570:149-153.
[15]	Huang R T, Wu H, Yang L.Study on the ammonia emission characteristics in an ammonia-based WFGD system [J].Chemical Engineering Journal, 2019,379:122257.
[16]	DL/T 2374-2021火电厂逃逸氨的测定靛酚蓝分光光度法[S].DL/T 2374-2021 Determination of ammonia slip in thermal power plant flue gas-Indophenol blue spectrophotometry [S].
[17]	GB/T 16157-1996固定污染源排气中颗粒物测定与气态污染物采样方法[S].GB/T 16157-1996 The determinaton of particulates and sampling methods of gaseous pollutants emitted from exhaust gas of stationary source [S].
[18]	DL/T 1494-2016燃煤锅炉飞灰中氨含量的测定离子色谱法[S].DL/T 1494-2016 Determination of ammonia ammonia content in fly ash of coal-fired power-Ion chromatography method [S].
[19]	李小龙,郑成强,刘广样,等.330MW燃煤机组递逸氨迁移转化特性研究[J].电力科技与环保, 2022,38(5):358-363.Li X L, Zheng C Q, Liu G X, et al.The migration and conversion characteristics of ammonia slip in a 330MW ultra-low emission coal-fired unit [J].Electric Power Technology and Environmental Protection, 2022,38(5):358-363.
[20]	HJ 562-2010火电厂烟气脱硝工程技术规范选择性催化还原法[S].HJ 562-2010 Engineering technical speccification of flue gas selective catalytic reduction denitration for themal power plant [S].
[21]	唐昊,李慧,杨江毅,等.NH3-SCR工艺中硫酸铵盐的生成与分解机理研究进展[J].化工进展, 2018,37(3):822-831.Tang H, LI H, Yang J Y, et al.Research progress on the formation and decomposition mechanism of ammonium sulfate in NH3-SCR process [J].Chemical Engineering Progress, 2018,37(3):822-831.
[22]	胡斌,周磊,孙宗康,等.烟气温湿度对电除尘脱除细颗粒的影响[J].东南大学学报(自然科学版), 2017,47(6):1148-1153.Hu B, Zhou L, Sun Z K, et al.Effects of temperature and humidity on electrostatic precipitator removal of fine particles [J].Journal of Southeast University (Natural Science Edition), 2017,47(6):1148-1153.
[23]	Jaworek A, Sobczyk A, Krupa A, et al.Hybrid electrostatic filtration systems for fly ash particles emission control [J].Separation and Purification Technology, 2019,213:283-302.
[24]	王建峰,刘沛奇,尤良洲,等.飞灰含氨量对脱硝装置氨逃逸测定的影响[J].中国电力, 2015,48(4):44-46.Wang J F, Liu P Q, You L Z, et al.Influence of ammonia concentration in fly ash on ammonia slip detection of de-nitration equipments [J].Electric Power, 2015,48(4):44-46.
[25]	Cheng T, Luo L Y, Yang L J, et al.Formation and emission characteristics of ammonium sulfates aerosols in flue gas downstream of SCR [J].Energy & Fuels, 2019;33:7861-7868.
[26]	Mohr M, Ylätalo S, Klippel N, et al.Submicron fly ash penetration through electrostatic precipitators at two coal power plants [J].Aerosol Science and Technology, 1996;24(3):191-204.
[27]	段璐.电袋除尘器颗粒物脱除理论和实验研究进展[J].粉煤灰综合利用, 2019,176(4):97-101.Duam L.Progress of theoretical and experimental study of particle removal by hybrid electrostatic precipitators [J].Comprehensive Use of Fly Ash, 2019,176(4):97-101.