1000MW近零排放燃煤机组重金属排放及分布特征

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Abstract The EPA Method 29 was used to sample the 1000 MW unit in Shouguang ultra-supercritical coal-fired power plant, the whole process monitoring of heavy metal pollutants (As, Pb, Se, Cd) at multiple points can be realized. The mass balance of heavy metals in the coal combustion process was established, and the enrichment and distribution characteristics of heavy metals in flue gas in coal-fired power plants were studied. The results showed that the heavy metal content of the flue gas was relatively low, the flue gas emission concentrations of As, Se, Pb and Cd were 1.11μg/m³, 0.59μg/m³, 0.33μg/m³ and 0.01μg/m³ at 100% load, respectively, and the heavy metal content at 45% load was close to that at 100% load. The distribution of various heavy metals in coal-fired units under different loads was presented. Pb, Se, and Cd are all enriched in fly ash, but the proportion of Se and Cd in the bottom slag increased significantly at low load. The removal rates of ESP for As, Pb, Se and Cd all reached more than 97% in the APCDs, and WFGD and WESP can deeply remove heavy metals under different loads.

Key words： coal-fired power unit heavy metal pollutants emission heavy metal pollutants emission distribution

Received: 21 October 2021

PACS:

X701

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	Articles by authors
	WANG Shu-min
	GU Yong-zheng
	YANG Jian-xing
	JIANG Yi-feng
	YU Xue-hai
	ZHANG Zhi-yuan
	WANG Jia-wei
	WANG Tao
	ZHANG Yong-sheng

Cite this article:

WANG Shu-min,GU Yong-zheng,YANG Jian-xing等. Emissions and distribution characteristics of heavy metal in 1000MW near-zero emission coal-fired units[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2060-2069.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2060

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