Influence of sludge co-combustion on trace element emission characteristics in a coal-fired power plant
ZHENG Cheng-qiang1,2, ZHU Fa-hua1, LI Jun-zhuang1,2, LI Xiao-long1,2, DUAN Jiu-xiang1,2, YAN Jun-bo1,2, WANG Xin-pei1,2, CHEN Zhi-yuan1,2, WANG Hong-liang1
1. China Energy Science and Technology Research Institute Co., Ltd., Nanjing, 210023, China; 2. Guoneng Nanjing Electric Power Test & Research Limited, Nanjing 210023, China
Abstract：Sampled by EPA Method 29 and analyzed by Cold Atomic Absorption Spectroscopy and Inductively Coupled Plasma Spectroscopy, the concentrations of trace elements in the raw fuels, flue gas and by-product samples before and after sludge co-combustion in an ultra-low emission coal-fired unit were obtained, with the influence of sludge co-combustion on the emission characteristics of trace elements being investigated. The concentrations of Zn and Cu elements in sludge were high, which was 18.81times and 17.64times than that in the coal samples, respectively. The content of trace elements in the coal fed into the furnace after sludge co-combustion was generally increased. The mass balance rates of trace elements in the whole system, boiler system and air pollution control facilities of the whole process before and after sludge co-combustion were all within the acceptable range. The co-combustion of sludge had no obvious effect on the distribution characteristics of trace elements, and discharging with fly ash was the main emission pathway for trace elements. The proportion of trace elements emitted to the atmosphere through the stack was very small, no more than 0.43%. Except for Hg, the trace elements in the flue gas in the SCR inlet before and after sludge co-combustion mainly existed in the form of particles. The relative enrichment coefficients of trace elements in fly ash and bottom ash did not change significantly after sludge co-combustion. After the coordinated control of the whole-process air pollution control facilities, the emission concentrations of trace elements in the stack outlet before and after sludge co-combustion were 0~12.76μg/m3 and 0~14.97μg/m3, respectively. The emission concentrations of trace elements after sludge co-combustion meet the requirements of the US emission standards for harmful air pollutants from coal-fired generating units, the air pollution emission standards for coal-fired coupled sludge power plants in Shanghai, and the Ministry of Ecology and Environment's domestic waste incineration pollution control standards. The existing air pollution control system in coal-fired power plants had good adaptability to the emission control of trace elements under the condition of 6% sludge co-combustion ratio.
郑成强, 朱法华, 李军状, 李小龙, 段玖祥, 严俊波, 王新培, 程志远, 王宏亮. 污泥掺烧对燃煤电厂痕量元素排放特性影响[J]. 中国环境科学, 2022, 42(12): 5570-5577.
ZHENG Cheng-qiang, ZHU Fa-hua, LI Jun-zhuang, LI Xiao-long, DUAN Jiu-xiang, YAN Jun-bo, WANG Xin-pei, CHEN Zhi-yuan, WANG Hong-liang. Influence of sludge co-combustion on trace element emission characteristics in a coal-fired power plant. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5570-5577.
朱法华,王玉山,徐振,等.中国电力行业碳达峰、碳中和的发展路径研究[J]. 电力科技与环保, 2021,37(3):9-16. Zhu F H, Wang Y S, Xu Z, Li J Z, Dong Y H, Li H, et al. Research on the development path of carbon peak and carbon neutrality in China's Power Industry[J]. Power Technology and Environmental Protection, 2021,37(3):9-16.
[2]
毛健雄."3060"目标下,我国煤电如何低碳发展[N]. 中国电力报, 2021-03-19. Mao Z X. Under the "3060" goal, how to develop low-carbon coal power in my country[N]. China Electric Power News, 2021-03-19.
[3]
黄伟,林英红,罗子丰,等.燃煤电厂污泥掺烧技术及其研究进展[J]. 上海电力大学学报, 2021,37(1):1-5. Huang W, Lin Y H, Luo Z F, et al. Progress on research and technology of sludge blending combustion in coal-fired power plants[J]. Journal of Shanghai University of Electric Power, 2021,37(1):1-5.
[4]
黄二仙,段小云.330MW热电联产机组燃煤耦合污泥发电技术的应用[J]. 重庆电力高等专科学校学报,2021,26(3):26-30. Huang E X, Duan X Y. A study on the application of the coal-fired sludge coupled power generation technology in the 330MW cogeneration unit[J]. Journal of Chongqing Electric Power College, 2021,26(3):26-30.
[5]
刘政艳,郑新梅,章严韬.燃煤电厂掺烧市政污泥工程大气污染分析[J]. 环境影响评价, 2017,39(6):34-38. Liu Z Y, Zheng X M, Zhang Y T. Analysis and research on air pollution of municipal sludge and coal co-firing power plants[J]. Environmental Impact Assessment, 2017,39(6):34-38.
[6]
曾多,于常春.燃煤耦合污泥发电技术探讨[J]. 重庆电力高等专科学校学报, 2019,24(1):21-25. Zeng D, Yu C C. A study on the coal-fired coupling sludge power generation technology[J]. Journal of Chongqing Electric Power College, 2019,24(1):21-25.
[7]
庄僖,许榕发,罗伟铿,等.市政污泥与生活垃圾掺烧的重金属排放特征与风险[J]. 生态环境学报, 2020,29(1):199-206. Zhuang X, Xu R F, Luo W K, et al. Heavy metal emission characteristics and risks in the co-combustion of sludge sewage and municipal solid waste[J]. Ecology and Environmental Sciences, 2020, 29(1):199-206.
[8]
王玉婷,赵泽华,王逸,等.我国典型印染行业废水处理污泥污染特征研究[J]. 生态与农村环境学报, 2020,36(12):1598-1604. Wang Y T, ZHAO Z H, Wang Y, et al. Study on the pollution characteristics of typical textile dyeing sludge (TDS) in China[J]. Journal of Ecology and Rural Environment, 2020,36(12):1598-1604.
[9]
卢锦程,段钰锋,赵士林,等.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 J C, Duan Y F, Zhao S L, et al. Experimental study on emission characteristics of trace elements in 600MW coal fired power plant[J]. China Environmental Science, 2018,38(12):4444-4450.
[10]
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, 2008,74:1-12.
[11]
Lopez-Anton M A, Diaz-Somoano M, Ochoa-Gonzalez R M, et al. Distribution of trace elements from a coal burned in two different Spanish power stations[J]. Industrial & Engineering Chemistry Research, 2011,50:12208-12216.
[12]
Zhao S L, Duan Y F, et al. Migration and Emission Characteristics of Trace Elements in a 660MW Coal-Fired Power Plant of China[J]. Energy & Fuel, 2016,30:5937-5944.
[13]
刘蕴芳,滕建标,苏耀明,等.煤粉炉掺烧干化污泥的污染物排放研究[J]. 环境工程学报, 2014,8(11):4969-4976..Liu Y F, Teng J B, Su Y M, et al. Research on pollutant discharge of pulverized coal furnace mixed with dry sludge[J]. Chinese Journal of Environmental Engineering, 2014,8(11):4969-4976.
[14]
余维佳,陈衍婷,徐玲玲,等.电厂污泥掺烧过程中元素迁移特性研究[J]. 生态环境学报, 2017,26(1):149-153. Xu W J, Chen Y T, Xu L L, et al. Elements Migration from A Coal-fired Power Plant Burning with Sludge[J]. Ecology and Environmental Sciences, 26(1):149-153.
[15]
冯炳全,李德波,孙超凡,等.300MW燃煤锅炉污泥掺烧现场试验关键技术研究与工程应用[J]. 发电设备, 2021,35(2):131-135. Feng B Q, Li D B, Sun C F, et al. Key technology research and engineering application of the co-combustion of sludge and coal in a 300MW coal-fired boiler[J]. Power equipment, 2021,35(2):131-135.
[16]
MYERS J, KELLY T, LAWRIE C, et al. Method M29 sampling and analysis:environmental technology verification report[R]. Battelle, Columbus, Ohio:United States Environmental Protection Agency (USEPA), 2002:15-22.
[17]
DL/T 1656-2016火电厂粉煤灰及炉渣中汞含量的测定[S]. DL/T 1656-2016 Determination of total mercury contents in fly ash and cinder of thermal power plants[S].
[18]
HJ 597-2011水质总汞的测定冷原子吸收分光光度法[S]. HJ 597-2011 Water-quality-Determination of total mercury-Cold atomic absorption spectrophotometry[S].
[19]
HJ766-2015固体废物金属元素的测定电感耦合等离子体质谱法[S]. HJ766-2015 Solid waste-Determination of metals-Inductively coupled plasma mass spectrometry[S].
[20]
HJ700-2014水质65种元素的测定电感耦合等离子体质谱法[S]. HJ700-2014 Water quality-Determiantion of 65elements-Inductively coupled plasma-mass spectrometry[S].
[21]
Wang S X, Zhang L, Li G H, et al. Mercury Emission and Speciation of Coal-Fired Power Plants in China[J]. Atmospheric Chemistry and Physics, 2010,10(3):1183-1192.
[22]
赵士林.煤中添加剂对烟气汞形态转化和燃煤痕量元素迁移的机理研究[D]. 南京:东南大学, 2019. Zhao S L. Mechanism study on flue gas mercury speciation transformation by adding additives in coal and trace elements migration in coal combustion process[D]. Nanjing:Southeast University, 2019.
[23]
黄亚继,金保昇,仲兆平,等.几种微量元素在煤燃烧过程中迁移规律的研究[J]. 能源研究与利用, 2002,(3):15-18. Huang Y J, Jin B S, Zhong Z P, Lan J X,Kong H L. Study on the migration law of several trace elements in coal combustion process[J]. Energy Research and Utilization, 2002,(3):15-18.
[24]
康艳红,李光哲,李国德,等.煤燃烧过程中金属元素迁移特性[J]. 电力环境保护, 2009,25(1):44-46. Kang Y H, Li G Z, Li G D, et al. Transfer characteristics of metal elements in coal combustion process[J]. Environmental Protection of Electric Power, 2009,25(1):44-46.
[25]
郭欣.煤燃烧过程中汞,砷,硒的排放与控制研究[D]. 武汉:华中科技大学, 2005. Guo X. Experimental and mechanism study on the mercury, arsenic and selenium transformation and emission control during coal combustion[D]. Wuhan:Huazhong University of Science and Technology, 2005.
[26]
陈磊,段钰锋,赵士林,等.350MW超低排放燃煤电厂污染物控制装置对汞的协同脱除[J]. 热能动力工程, 2020,35(2):187-193. Chen L, Duan Y F, Zhao S L, et al. Mercury Co-Removal by the Air Pollutant Control Devices in a 350MW Ultra-Low Emission Coal-Fired Power Plant[J]. Journal of Engineering for Thermal Energy and Power, 2020,35(2):195-193.
[27]
赵士林,段钰锋,丁艳军,等.320MW燃煤电厂痕量元素的分布,脱除及排放特性[J]. 化工学报, 2017,68(7):2910-2917. Zhao S L, Duan Y F, Ding Y J, et al. Distribution, co-removal and emission characteristic of trace elements in 320MW coal-fired power plant[J]. CIESC Journal, 2017,68(7):2910-2917.
[28]
石志鹏,段伦博,黄治军.1000MW超低排放机组Hg迁移特性[J]. 热力发电, 2021,50(7):176-182. Shi Z P, Duan L B, Huang Z J. Migration characteristics of Hg from a 1000MW ultra-low emission coal-fired power plant[J]. Thermal Power Generation, 2021,50(7):176-182.
[29]
华伟,孙和泰,祁建民,等.燃煤电厂超低排放机组重金属铅,砷排放特性[J]. 热力发电, 2019,48(10):65-70. Hua W, Sun H T, Qi J M, et al. Emission characteristics of Pb and As from an ultra-low emission coal-fired power plant[J]. Thermal Power Generation, 2019,48(10):65-70.
[30]
Zhao S, Duan Y, Chen L, et al. Study on emission of hazardous trace elements in a 350MW coal-fired power plant. Part 2. arsenic, chromium, barium, manganese, lead[J]. Environmental Pollution, 2017,226:404-411.
[31]
Helble J J. A model for the air emissions of trace metallic elements from coal combustors equipped with electrostatic precipitators[J]. Fuel Processing Technology, 2000,63(2):125-147.
[32]
Xu M H, Yu D X, Yao H, et al. Coal combustion-generated aerosols:Formation and properties[J]. Proceedings of the Combustion Institute, 2011,33(1):1681-1697.
[33]
Tang Q, Liu G, Yan Z, et al. Distribution and fate of environmentally sensitive elements (arsenic, mercury, stibium and selenium) in coal-fired power plants at Huainan, Anhui, China[J]. Fuel, 2012,95(1):334-339.
[34]
Cordo Ba P, Ochoa-Gonzalez R, Font O, et al. Partitioning of trace inorganic elements in a coal-fired power plant equipped with a wet Flue Gas Desulphurisation system[J]. Fuel, 2012,92(1):145-157.
[35]
王树民,白孝轩,宋畅,等.燃煤电厂大气汞及其他痕量元素排放标准研究[J]. 中国环境科学, 2021,41(4):1949-1958. Wang S M, Bai X X, Song C, et al. Study of atmospheric trace elements emission standards for coal-fired power plants in China[J]. China environmental science, 2021,41(4):1949-1958.
[36]
National Emission Standards for Hazardous Air Pollutants From Coal and Oil-Fired Electric Utility Steam Generating Units and Standards of Performance for Fossil-Fuel-Fired Electric Utility, Industrial Commercial Institutional, and Small Industrial Commercial Institutional Steam Generating Units[S]. Washington DC, United States:US EPA, 2016.
[37]
DB 31/1291-2021燃煤耦合污泥电厂大气污染物排放标准[S]. DB 31/1291-2021 Emission standard of air pollutants for coal & sludge co-fired power plant[S].
[38]
环境保护部.GB 18485-2014生活垃圾焚烧污染控制标准[S]. Ministry of Environmental Protection. GB 18485-2014Standard for control on the municipal solid waste incineration[S].
[39]
魏勇.燃煤过程典型重金属的释放、迁移转化及富集机制研究[D]. 合肥:中国科学技术大学, 2021. Wei Y. Study on the Release, Migration, Transformation and Enrichment Mechanism of Typical Heavy Metals during Coal Combustion[D]. Hefei:University of Science and Technology of China, 2021.
[40]
Zhao S, Duan Y, Li Y, et al. Emission characteristic and transformation mechanism of hazardous trace elements in a coal-fired power plant[J]. Fuel, 2018,214(5):597-606.
