| 典型超低排放燃煤电厂可凝结颗粒物特征和成因 |
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| 引用本文： | 邓建国,王刚,张莹,李妍菁,段雷,蒋靖坤. 典型超低排放燃煤电厂可凝结颗粒物特征和成因[J]. 环境科学, 2020, 41(4): 1589-1593. DOI: 10.13227/j.hjkx.201910091 |
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| 作者姓名： | 邓建国 王刚 张莹 李妍菁 段雷 蒋靖坤 |
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| 作者单位： | 清华大学环境学院,北京100084,清华大学环境学院,北京100084,清华大学环境学院,北京100084,清华大学环境学院,北京100084,清华大学环境学院,北京100084;国家环境保护大气复合污染来源与控制重点实验室,北京100084,清华大学环境学院,北京100084;国家环境保护大气复合污染来源与控制重点实验室,北京100084 |
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| 基金项目： | 国家重点研发计划项目（2018YFC0213202） |
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| 摘 要： | 燃煤电厂排放的可凝结颗粒物(condensable particle matter,CPM)由于其潜在的大气环境影响引起广泛关注,而目前对于燃煤电厂CPM的特征和成因尚不清楚.本研究通过稀释间接法收集了超低排放改造后的典型燃煤电厂石灰石-石膏湿法脱硫(wet flue gas desulfurization,WFGD)入口/出口和湿式静电除尘(wet electrostatic precipitator,WESP)出口位置的CPM,并对其进行重量分析和水溶性离子分析,同时测量了可能的CPM气态前体物浓度.结果表明,烟气中CPM的主要气态前体物为HCl、HNO3、SO3和NH3等.烟气温度降低后,这些气态前体物通过冷凝或化学反应形成CPM.所形成CPM主要化学组分包括SO■、Cl-、NO-3和NH+4等水溶性离子.WFGD和WESP可以降低CPM气态前体物的浓度,进而减少CPM排放,经过WFGD和WESP后CPM浓...
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| 关 键 词： | 燃煤电厂 可凝结颗粒物(CPM) 稀释间接法 石灰石-石膏湿法脱硫(WFGD) 湿式电除尘器(WESP) |
| 收稿时间： | 2019-10-15 |
| 修稿时间： | 2019-11-25 |
Characteristics of Condensable Particulate Matter in Ultra-low Emission Coal-Fired Power Plants |
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| DENG Jian-guo,WANG Gang,ZHANG Ying,LI Yan-jing,DUAN Lei and JIANG Jing-kun. Characteristics of Condensable Particulate Matter in Ultra-low Emission Coal-Fired Power Plants[J]. Chinese Journal of Environmental Science, 2020, 41(4): 1589-1593. DOI: 10.13227/j.hjkx.201910091 |
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| Authors: | DENG Jian-guo WANG Gang ZHANG Ying LI Yan-jing DUAN Lei JIANG Jing-kun |
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| Affiliation: | School of Environment, Tsinghua University, Beijing 100084, China,School of Environment, Tsinghua University, Beijing 100084, China,School of Environment, Tsinghua University, Beijing 100084, China,School of Environment, Tsinghua University, Beijing 100084, China,School of Environment, Tsinghua University, Beijing 100084, China;State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China and School of Environment, Tsinghua University, Beijing 100084, China;State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China |
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| Abstract: | The condensable particle matter (CPM) from coal-fired power plants has attracted significant attention for its potential influence on air quality. The knowledge of CPM emissions from coal-fired power plants is limited. In this study, CPM was collected at the inlet and outlet of wet flue gas desulfurization (WFGD) and the outlet of wet electrostatic precipitator (WESP) using in-direct dilution method. Both mass concentration and water-soluble ions of CPM were analyzed after sampling. The gas precursors were measured at the same time. We showed that gas precursors such as HCl, HNO3, SO3, and NH3 significantly contributed to CPM from coal-fired power plants. As the temperature of flue gas decreased, these gas precursors were observed to form CPM. The major components of CPM were water-soluble ions such as SO42-, Cl-, NO3-, and NH4+. WFGD and WESP could reduce the CPM gas precursors. Therefore, CPM concentrations after WFGD and WESP of the five tested coal-fired power plants were reduced by 27% and 45%, respectively. In addition, the condensation of SO3 increased SO42- concentration but reduced Cl- and NO3- contents. Finally, SO42- was found to be the major water-soluble ion of CPM. |
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| Keywords: | coal-fired power plant condensable particle matter (CPM) in-direct dilution wet flue gas desulfurization (WFGD) wet electrostatic precipitator (WESP) |
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