Emissions and distribution characteristics of heavy metal in 1000MW near-zero emission coal-fired units
WANG Shu-min1, GU Yong-zheng2, YANG Jian-xing3, JIANG Yi-feng3, YU Xue-hai4, ZHANG Zhi-yuan3, WANG Jia-wei5, WANG Tao5, ZHANG Yong-sheng5
1. China Energy Investment Corporation, Beijing 100011, China; 2. China Shenhua Energy Co., Ltd., Guohua Power Branch, Beijing 100025, China; 3. Shenhua Guohua Shouguang Power Generation, Weifang 262714, China; 4. Shenhua Guohua (Beijing) Electric Power Research Institute, Beijing 100018, China; 5. North China Electric Power University, School of Energy, Power and Mechanical Engineering, Beijing 102206, China
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.
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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. Emissions and distribution characteristics of heavy metal in 1000MW near-zero emission coal-fired units. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2060-2069.
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