Analysis on Mercury Emission From WFGD and WESP Wastewater in Ultra-Low Air Pollutant Emission Coal-Fired Power Plants

doi:10.11930/j.issn.1004-9649.201610054

Abstract

Abstract: In order to achieve the goal of ultra-low flue gas emission, a series of retrofit projects have been carried out on the 300 MW subcritical natural circulation coal-fired unit of Sanhe Power Generation Co., Ltd., such as low NO_x burner modification, SCR denitration modification, low-low temperature economizer installation, high frequency power source modification for the electrostatic precipitator (ESP), efficiency improvement and tubular demister installation for the WFGD absorber, as well as the installation of wet ESP (WESP). Taking the unit as the study object to explore the changes of the mercury concentrations in the WFGD and WESP wastewater after the retrofits, the makeup water and discharge water of both the FGD absorber and WESP are sampled to analyze the mercury contents. The results show that due to the low mercury content in coal, limestone and the makeup water, the mercury concentration in WFGD and WESP wastewater is also very low which ranges between 0.140 and 0.468 μg/L and between 0.094 and 0.102 μg/L respectively. The mercury contents in the 52 m³/h WFGD discharge water increase by 1.75 to 5.50 mg while no significant changes of the mercury concentration is observed in the WESP discharge water.

Key words: coal-fired power plant, ultra-low emission, WESP wastewater, WFGD wastewater, mercury emission

CLC Number:

X705

SONG Chang, ZHANG Yi, HAO Jian, ZHANG Jinbao, WANG Jiawei, AN Liansuo, ZHANG Yongsheng. Analysis on Mercury Emission From WFGD and WESP Wastewater in Ultra-Low Air Pollutant Emission Coal-Fired Power Plants[J]. Electric Power, 2017, 50(11): 164-167.

Add to citation manager EndNote|Ris|BibTeX

URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201610054

https://www.electricpower.com.cn/EN/Y2017/V50/I11/164

References

[1] 中国环境保护产业协会电除尘委员会. 燃煤电厂烟气超低排放技术[M]. 北京：中国电力出版社,2015.
[2] 王树民,宋畅,陈寅彪,等. 燃煤电厂大气污染物“近零排放”技术研究及工程应用[J]. 环境科学研究,2015,28（4）：487-494.
WANG Shumin, SONG Chang, CHEN Yinbiao, et al . Technology research and engineering application of near-zero air pollutant emission coal-fired power plants [J]. Research of environmental sciences, 2015, 28(4): 487-494.
[3] 周洪光,赵磊,陈创社,等. 燃用神华煤火电厂近零排放技术路线与工程应用[J]. 中国电力,2015,48（5）：89-92,96.
ZHOU Hongguang, ZHAO Lei, CHEN Chuangshe, et al . Research on the technical route and industrial application of near-zero emission of coal-fired power plants supplied with shenhua coal [J]. Electric Power, 2015, 48(5): 89-92, 96.
[4] 潘伟平,张永生,李文瀚,等. 燃煤汞污染监测及控制技术[J]. 科技导报,2014,32（33）：57-60.
PAN Weiping, ZHANG Yongsheng, LI Wenhan, et al . Mercury monitoring and controlling technologies for coal power plants[J]. Science & Technology Review, 2014, 32(33): 57-60.
[5] PAVLISH J H, SONDREAL E A, MANN M D, et al . Status review of mercury control options for coal-fired power plants[J]. Fuel Processing Technology, 2003, 82(2): 89-165.
[6] DRANGA B A, KOESER H. Increased co-oxidation activity for mercury under hot and cold site coal power plant conditions- Preparation and evaluation of Au/TiO 2 -coated SCR-DeNO x catalysts [J]. Applied Catalysis B: Environmental 2015, 166: 302-312.
[7] 田贺忠,利用湿式静电除尘器（ESP）脱除汞[J]. 国际电力, 2005,9（6）：62-64.
TIAN Hezhong. Mercury control by using wet electrostatic precipitators[J]. International Electric Power for China, 2005, 9(6): 62-64.
[8] 丁承刚,罗汉成,潘卫国,湿式静电除尘器及其脱除烟气中汞的研究进展[J]. 上海电力学院学报,2015,31（2）：151-155.
DING Chenggang, LUO Hancheng, PAN Weiguo. Research progress on wet electrostatic precipitator and its mercury removal in flue gas [J]. Journal of Shanghai University of Electric Power[J]. 2015, 31(2): 151-155.
[9] MA Shuangchen, CHAI Jin, CHEN Gongda, et al . Research on desulfurization wastewater evaporation: Present and future perspectives[J]. Renewable & Sustainable Energy Reviews. 2016,58: 1 143-1 151.
[10] 宋畅,张翼,刘更生,等. 燃煤电厂超低排放改造前后汞污染排放特征[J].环境科学研究,2017,30（5）：672-677.
SONG Chang, ZHANG Yi, LIU Gengsheng, et al . Mercury emission characteristics of ultra-low air pollutant emission coal- fired power plants before and after retrofitted[J]. Research of environmental sciences, 2017, 30(5): 672-677.
[11] REYNOLDS J. Mercury removal via wet ESP[J]. Power, 2004,148(8): 54-59.

[1]	Chao YI, Da TENG, Shaowei SONG, Ou CHEN. Application Analysis of Flue Gas Condensation Recovery in Coal-fired Power Plants by Spraying Method [J]. Electric Power, 2023, 56(11): 226-235.
[2]	LIU Hanxiao, WU Liming, ZHAO Lin, YU Liyuan, LI Jianguo, CUI Ying. Study on Emission Reduction and Energy Efficiency Characteristics of Wet Electrostatic Precipitator for Coal Fired Power Plants [J]. Electric Power, 2022, 55(5): 196-203.
[3]	ZHANG Zhiyong, MO Hua, WANG Meng, SHUAI Wei. Study of Flue Gas Pollutant Control in a 600 MW Coal-Fired Unit [J]. Electric Power, 2022, 55(5): 204-210.
[4]	ZHANG Guozhu, ZHANG Juntai, WEN Yu, YANG Kaixuan, LIU Ming, LIU Jiping. Study on Off-design Condition Characteristics and Control Strategy of Fluegas Waste Heat and Water Recovery System of Coal-Fired Power Plants [J]. Electric Power, 2022, 55(4): 214-220.
[5]	SUN Zunqiang, ZHENG Chenghang, ZHOU Can, WANG Sheng, MA Xiuyuan, YE Yike. Operational Status Analysis and Optimization Suggestions of Typical Dust Collectors in Coal-Fired Power Plants [J]. Electric Power, 2022, 55(11): 194-201.
[6]	WANG Yanzhe, ZHOU Sheng, YAO Zilin, OU Xunmin. Life Cycle Modeling Analysis of the Interaction Between Carbon Dioxide and Air Pollutant Emissions of Coal Power in China [J]. Electric Power, 2021, 54(8): 128-135.
[7]	ZHU Fahua, XU Yueyang, SUN Zunqiang, SUN Xueli, WANG Sheng. Practice and Enlightenment of Ultra-low Emission and Energy-Saving Retrofit of Coal-Fired Power Plants in China [J]. Electric Power, 2021, 54(4): 1-8.
[8]	WU Jiayu, MO Hua, HU Yun, ZHU Jie, SHUAI Wei, ZHANG Qing, JIANG An. Spatio-Temporal Variation Characteristics of Fugitive Particulate Matter Emissions from the Coal Storage Yard of Coal-Fired Power Plants in Beijing-Tianjin-Hebei and Surrounding Areas under Different Regulatory Scenarios [J]. Electric Power, 2021, 54(2): 182-189.
[9]	HUI Lifeng. Comparative Analysis of PM₁₀/PM_2.5 Laboratory Sampling for Ultra-low Emission of Coal-Fired Power Plants [J]. Electric Power, 2021, 54(2): 190-196.
[10]	ZHAO Hong, ZHANG Fajie, MA Yunlong, MA Baolin, TANG Xiao, XU Renbo, LUO Tongda, LI Chengbao, REN Chuanming, YU Jie, SUN Lushi. Test Study on the Migration Characteristics of Slip Ammonia from the SCR System in the Coal-Fired Power Plant [J]. Electric Power, 2021, 54(1): 196-202.
[11]	ZHAO Bing, WANG Haigang, HU Dong, CHEN Kunyang, JIN Xuliang, YIN Aiming. Study on Mercury Removal Performance of Alkali Adsorbent in Coal-Fired Power Plant [J]. Electric Power, 2020, 53(9): 208-213.
[12]	JIA Xibu. In-depth Analysis on Wastewater Discharge of Wet Limestone-Gypsum FGD [J]. Electric Power, 2020, 53(8): 139-144,163.
[13]	WU Jiayu, ZHU Jie, MO Hua, ZHANG Feng, SHUAI Wei, ZHANG Qing, NA Qin. Test Study on SO₃ Control Effect of Slurry Cooling Wet Plume Treatment Project in a Typical Coal-Fired Power Plant [J]. Electric Power, 2020, 53(8): 145-150,172.
[14]	MA Xueli, SUN Xijin, SU Shenshen, ZHANG Renfeng, DANG Lichen, HUANG Xianchang, XIE Yongping. Optimization of Chimney Height for Coal-Fired Power Plants for Ultra-Low Emission [J]. Electric Power, 2020, 53(5): 179-184.
[15]	LU Junchao, TAO Leixing, YUE Chunmei, CHEN Rui, LIU Zhichao, WANG Yanyan, ZHENG Fangdong, WAN Di. The Present State and Prospect of Water Consumption in Coal-Fired Power Plants [J]. Electric Power, 2020, 53(3): 139-146.