Abstract
To study the effect of dry sorbent injection (DSI) system on the emission characteristics of condensable particulate matter (CPM) in a 600MW unit of an ultra-low emission coal-fired power plant in China, the EPA Method 202A is used to sample the flue gas from its total exhaust. Through sample analysis, the CPM emission concentration and water-soluble ion composition corresponding to the two unit loads and whether the DSI is running are obtained. The results show that the use of DSI system reduces CPM emissions at 600MW and 300MW unit loads, and the CPM emission concentration is reduced by 32% and 9.7%, respectively. For the CPM reduction caused by DSI system under these two loads, SO4 2- and Cl− together contributed 65.7% and 87.3%, respectively. The DSI system achieves the removal of CPM mainly by removing the SO3 and HCl, which are gaseous precursors of SO4 2- and Cl− in CPM. At the same time, water-soluble ions are the main component of CPM. The analysis of its composition shows that the masses of NH4 +, Cl− and SO42- ions are relatively large, and they together account for 95.8%-96.8% of all water-soluble ions mass.
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