[Conversion Characterizations of Sulfate Ion and Nitrate Ion in Particulate Matter from Coal-fired Power Plants].
[Conversion Characterizations of Sulfate Ion and Nitrate Ion in Particulate Matter from Coal-fired Power Plants].
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DOI：
10.13227/j.hjkx.202101097
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发表时间：
2021-10
期刊：
影响因子：
--
通讯作者：
Liu Yang;Qing He;Zhongyi Sheng
中科院分区：
文献类型：
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作者：
Liu Yang;Qing He;Zhongyi Sheng
燃煤电厂排放的颗粒物包括可凝颗粒物（CPM）和可滤颗粒物（FPM）。通过对7个超低排放燃煤电厂湿法烟气脱硫（WFGD）进出口和电除尘器（WESP）出口CPM和FPM中SO 42-和NO3-组分浓度的分析，研究了其变化规律和转化特征。结果表明，湿法脱硫后，CPM中SO 42-和NO3-浓度均有所降低，降低率分别为43.12%~ 86.84%和17.99%~ 91.58%，与FPM的转化趋势不同。湿式电除尘器处理后，CPM的SO 42-和NO3-浓度均有所增加，降低率分别为21.05%~ 424.65%和13.51%~ 298.37%，也与FPM不同。在湿法烟气脱硫系统中，随着烟气温度的降低和湿度的增加，CPM会发生凝结和聚集，转化为FPM。在WESP系统中，烟气中的SO2和NO2联合收割机与水蒸气发生氧化还原反应，通过协同作用促进CPM中SO 42-和NO3-的生成。
The particulate matter emitted from coal-fired power plants includes condensable particulate matter(CPM) and filterable particulate matter(FPM). By analyzing the concentration of SO42-and NO3- 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 SO42- and NO3- 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 SO42- and NO3- 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, SO2 and NO2 in the flue gas combine with water vapor in a redox reaction, which promotes the generation of SO42- and NO3- in CPM through synergistic action.