Deng Jian-Guo, Wang Gang, Zhang Ying, Li Yan-Jing, Duan Lei, Jiang Jing-Kun
School of Environment, Tsinghua University, Beijing 100084, China.
State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China.
Huan Jing Ke Xue. 2020 Apr 8;41(4):1589-1593. doi: 10.13227/j.hjkx.201910091.
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, HNO, SO, and NH 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 SO, Cl, NO, and NH. 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 SO increased SO concentration but reduced Cl and NO contents. Finally, SO was found to be the major water-soluble ion of CPM.
燃煤电厂的可凝结颗粒物（CPM）因其对空气质量的潜在影响而备受关注。目前关于燃煤电厂CPM排放的知识有限。在本研究中，采用间接稀释法在湿法烟气脱硫（WFGD）进出口和湿式静电除尘器（WESP）出口采集CPM。采样后分析了CPM的质量浓度和水溶性离子。同时测量了气体前驱体。结果表明，HCl、HNO、SO和NH等气体前驱体对燃煤电厂的CPM有显著贡献。随着烟气温度降低，这些气体前驱体形成CPM。CPM的主要成分是SO、Cl、NO和NH等水溶性离子。WFGD和WESP可减少CPM气体前驱体。因此，五个测试燃煤电厂经WFGD和WESP处理后CPM浓度分别降低了27%和45%。此外，SO的凝结增加了SO浓度，但降低了Cl和NO含量。最后，发现SO是CPM的主要水溶性离子。
