Actual mercury speciation and mercury discharges from coal-fired power plants in Inner Mongolia, Northern China | |
Shunlin Tang; Lina Wang; Xinbin Feng; Zhaohui Feng; Ruiyang Li; Huipeng Fan; Ke Li | |
2016 | |
发表期刊 | Fuel
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卷号 | 180页码:194-204 |
摘要 | Mercury species distribution in the flue gas from three typical coal-fired power plants have been investigated using a C-5000 sampler for Ontario Hydro Method (OHM) to evaluate specified Hg emission inventories in the largest coal-production province of China, Inner Mongolia. The feed coal, bottom ash, fly ash and gypsum have also been sampled in the field. Mercury emissions are in the dominant form of Hg0 (>85%). The Hg2+ (<15%) and the Hgp (<2%) emissions are minor fractions of Hgt in the flue gas. The wet limestone flue gas desulfurization device (WLFGD) showed much higher removal efficiency for Hg2+ (87–95%) than for the other two Hg species. The input Hg/output Hg varied from 92% to 115% for the tested 3 coal-fried utility boilers during sampling time. We obtained comprehensive Hg discharge factors, including direct atmospheric Hg emission factors and indirect discharge factors of Hg associated with bottom ash, fly ash and gypsum, to the environment, designating the fates of Hg in coal. We estimated the Hg discharges from coal-fired power plants in Inner Mongolia in 2008–2014 and expanded to China. The maximum of direct Hg emissions from coal-fired power plants of Inner Mongolia was 24 Mg in 2012. The Chinese coal-fired power plants emitted directly 100 Mg Hg to the atmosphere every year at the nationwide air control actions. The maximum discharges of Hg associated with fly ash and gypsum of Inner Mongolia was 81 Mg and 11 Mg in 2012, respectively. The national Hg discharges with fly ash and gypsum every year are respectively about 300 Mg and 82 Mg, majority of which may be reemitted to the atmosphere by the utilization industry. Therefore, mercury emissions from coal-fired power plants are not the largest single source of Hg to the atmosphere in normal operation of the current efficient denitrification, particles control and desulfurization devices. Instead, the utilization industry of fly ash and gypsum would be emitting more Hg to the atmosphere. |
关键词 | Mercury Species direct Hg Emission factors Hg Discharge Factors coal-fired Power Plants inner Mongolia |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/9619 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.Institute of Resources and Environment, Henan Polytechnic University, Jiaozuo, Henan Province 454000, China 2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 3.Jiaozuo Environmental Monitoring Station, Jiaozuo, Henan Province 454000, China |
推荐引用方式 GB/T 7714 | Shunlin Tang,Lina Wang,Xinbin Feng,et al. Actual mercury speciation and mercury discharges from coal-fired power plants in Inner Mongolia, Northern China[J]. Fuel,2016,180:194-204. |
APA | Shunlin Tang.,Lina Wang.,Xinbin Feng.,Zhaohui Feng.,Ruiyang Li.,...&Ke Li.(2016).Actual mercury speciation and mercury discharges from coal-fired power plants in Inner Mongolia, Northern China.Fuel,180,194-204. |
MLA | Shunlin Tang,et al."Actual mercury speciation and mercury discharges from coal-fired power plants in Inner Mongolia, Northern China".Fuel 180(2016):194-204. |
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