Yang Liu, He Qing, Sheng Zhong-Yi
School of Environment, Nanjing Normal University, Nanjing 210023, China.
Suzhou Industrial Technology Research Institute of Zhejiang University, Suzhou 215163, China.
Huan Jing Ke Xue. 2021 Oct 8;42(10):4678-4686. doi: 10.13227/j.hjkx.202101097.
The particulate matter emitted from coal-fired power plants includes condensable particulate matter(CPM) and filterable particulate matter(FPM). By analyzing the concentration of SOand NO components of CPM and FPM in the inlet/outlet of wet flue gas desulfurization(WFGD) and the outlet of wet electrostatic precipitator(WESP) from 7 ultra-low emission coal-fired power plants, the variation laws and transformation characteristics were investigated. The results showed that the concentration of SO and NO of CPM decreased after WFGD, with reduction rates of 43.12%-86.84% and 17.99%-91.58%, respectively, which were different from the conversion trend of FPM. The concentrations of SO and NO of CPM increased after WESP, with reduction rates of 21.05%-424.65% and 13.51%-298.37%, respectively, which were also different from that of FPM. In the WFGD system, CPM could be transformed into FPM due via condensation and aggregation under the decreasing temperature and increasing of humidity of the flue gas. In the WESP system, SO and NO in the flue gas combine with water vapor in a redox reaction, which promotes the generation of SO and NO in CPM through synergistic action.
燃煤发电厂排放的颗粒物包括可凝结颗粒物（CPM）和可过滤颗粒物（FPM）。通过分析7座超低排放燃煤发电厂的湿法烟气脱硫（WFGD）进出口以及湿式静电除尘器（WESP）出口处CPM和FPM中SO和NO成分的浓度，研究了其变化规律和转化特性。结果表明，WFGD后CPM中SO和NO的浓度降低，降低率分别为43.12% - 86.84%和17.99% - 91.58%，这与FPM的转化趋势不同。WESP后CPM中SO和NO的浓度升高，降低率分别为21.05% - 424.65%和13.51% - 298.37%，这也与FPM的不同。在WFGD系统中，烟气温度降低和湿度增加，CPM可通过冷凝和聚集转化为FPM。在WESP系统中，烟气中的SO和NO与水蒸气发生氧化还原反应，通过协同作用促进CPM中SO和NO的生成。
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