Experimental study on emission characteristics of trace elements in 600MW coal fired power plant
LU Jin-cheng1, DUAN Yu-feng1, ZHAO Shi-lin1, BAI Li-yi1, CHEN Cong1, LI Chun-feng1, TAO Jun2
1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
2. Datang Environment Industry Group Co., Ltd., Beijing 100097, China
In this study, trace elements in the flue gas at the inlet/outlet of SCR, ESP and WFGD at a 600MW coal-fired power plant were sampled by the USEPA Method 29 simultaneous. The emission of 12 trace elements (Cr, Mn, Co, Ni, Cu, Zn, As, Mo, Cd, Sb, Ba, Pb) was studied. The results showed that the mass balance rates of trace elements of the entire power plant system, boiler, SCR, ESP, and WFGD were within an acceptable range, which indicates experimental results are accurate and reliable. The 12 trace elements were mainly distributed in the ESP fly ash with relative distribution rates of 69.97%~98.79%. The relative enrichment indexed of trace elements in the bottom slag were between 0.04 and 0.51 and that in the ESP fly ash were between 0.3 and 1.23. As, Cd and Pb in ESP fly ash and Mn, Co and Ni in WFGD wastewater may pollute soil and groundwater, which need to give enough attention. The emission concentration of 12 trace elements into the atmosphere was 0.02~12.57μg/m3 with the emission factor of 0.01~2.13g/1012J. The emission concentration of Ni, As, Cd and Pb reached 2.04, 0.13, 0.02 and 3.35μg/m3, respectively, which far exceed the emission limits of the European Union air quality standards and should be restricted.
卢锦程, 段钰锋, 赵士林, 白李一, 陈聪, 李春峰, 陶君. 600MW燃煤电厂痕量元素排放特性实验研究[J]. 中国环境科学, 2018, 38(12): 4444-4450.
LU Jin-cheng, DUAN Yu-feng, ZHAO Shi-lin, BAI Li-yi, CHEN Cong, LI Chun-feng, TAO Jun. Experimental study on emission characteristics of trace elements in 600MW coal fired power plant. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(12): 4444-4450.
Xu M, Yan R, Zheng C, et al. Status of trace element emission in a coal combustion process:a review[J]. Fuel Processing Technology, 2003,85(2):215-237.
[3]
Zhao S, Duan Y, Lei C, et al. Study on emission of hazardous trace elements in a 350MW coal-fired power plant[J]. Environmental Pollution, 2017,229:863.
[4]
Lu S Y, Zhang H M, Sojinu S O, et al. Trace elements contamination and human health risk assessment in drinking water from Shenzhen, China[J]. Environmental Monitoring & Assessment, 2015,187(1):4220.
[5]
Swanson S M, Engle M A, Ruppert L F, et al. Partitioning of selected trace elements in coal combustion products from two coal-burning power plants in the United States[J]. International Journal of Coal Geology, 2013,113(3):116-126.
[6]
Ke C, Yan W, Tian H, et al. Atmospheric Emission Characteristics and Control Policies of Five Precedent-Controlled Toxic Heavy Metals from Anthropogenic Sources in China[J]. Environmental Science & Technology, 2015,49(2):1206.
[7]
Goodarzi F, Huggins F E, Sanei H. Assessment of elements, speciation of As, Cr, Ni and emitted Hg for a Canadian power plant burning bituminous coal[J]. International Journal of Coal Geology, 2008, 74(1):1-12.
[8]
Lopezanton M A, Diazsomoano M, Ochoagonzalez R, et al. Distribution of Trace Elements from a Coal Burned in Two Different Spanish Power Stations[J]. Industrial & Engineering Chemistry Research, 2011,50(21).
[9]
Querol X, Fernandez-Turiel J L, Lopez-Soler A. Trace elements in coal and their behavior during combustion in a large power station[J]. Fuel, 1995,74(3):331-343.
[10]
Meij R. Trace element behavior in coal-fired power plants[J]. Fuel Processing Technology, 1994,39(1-3):199-217.
Tang Q, Liu G, Zhou C, et al. Distribution of trace elements in feed coal and combustion residues from two coal-fired power plants at Huainan, Anhui, China[J]. Fuel, 2013,107(9):315-322.
Myers J, Kelly T, Lawrie C, et al. Method M29 sampling and analysis:environment technology verification report[R]. Battelle, Columbus, Ohio:United States Environmental Protection Agency (USEPA), 2002.
[17]
Dai S, Ren D, Chou C L, et al. Geochemistry of trace elements in Chinese coals:A review of abundances, genetic types, impacts on human health, and industrial utilization[J]. International Journal of Coal Geology, 2012,94(3):3-21.
[18]
Wang S X, Zhang L, Li G H, et al. Mercury emission and speciation of coal-fired power plants in China[J]. Atmospheric Chemistry & Physics Discussions, 2009,10(3):1183-1192.
[19]
Quick W J, Irons R. Trace element partitioning during the firing of washed and untreated power station coals[J]. Fuel, 2002,81(5):665-672.
[20]
GB 15618-2018土壤环境质量标准农用地土壤污染风险管控标准(试行)[S].
[21]
GB14848-2017地下水环境质量标准[S].
[22]
Deng S, Shi Y, Liu Y, et al. Emission characteristics of Cd, Pb and Mn from coal combustion:Field study at coal-fired power plants in China[J]. Fuel Processing Technology, 2014,126(10):469-475.
[23]
GB13223-2011火电厂大气污染物排放标准[S].
[24]
DB11/139-2015锅炉大气污染物排放标准[S].
[25]
GB16297-1996大气污染物综合排放标准[S].
[26]
European Commission Air quality standards[S].2015, http://ec.europa.eu/environment/air/quality/standards.htm.
