期刊
ENVIRONMENTAL POLLUTION
卷 230, 期 -, 页码 655-662出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2017.06.103
关键词
PM2.5; Coal-fired power plant; Flue gas desulfurization (FGD); Selective catalytic reduction (SCR); Water-soluble ions; Primary ammonium aerosol emissions; Ammonia slip
资金
- National Basic Research Program of China [2013CB228505]
Flue gas desulfurization (FGD) and selective catalytic reduction (SCR) technologies have been widely used to control the emissions of sulphur dioxide (SO2) and nitrogen oxides (NOx) from coal-fired power plants (CFPP5). Field measurements of emission characteristics of four conventional CFPPs indicated a significant increase in particulate ionic species, increasing PM2.5 emission with FGD and SCR installations. The mean concentrations of PM2.5 from all CFPP5 tested were 3.79 +/- 137 mg/m(3) and 5.02 +/- 1.73 mg/m(3) at the FGD inlet and outlet, respectively, and the corresponding contributions of ionic species were 19.1 7.7% and 38.2 7.8%, respectively. The FGD was found to enhance the conversion of NH3 slip from the SCR to NH4- in the PM2.5, together with the conversion of SO2 to SO42-, and increased the primary NH4+ and SO42- aerosol emissions by approximately 18.9 and 4.2 times, respectively. This adverse effect should be considered when updating the emission inventory of CFPP5 and should draw the attention of policy makers for future air pollution control. (C) 2017 Elsevier Ltd. All rights reserved.
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