Abstract
A 660 MW unit of a CFPP (coal-fired power plant) with ultralow pollutants emission was chosen for field experiment. The PM (particulate matter) was sampled by DLPI (Dekati low pressure impactor) at the inlet/outlet of APCDs (air pollution control devices). The removal efficiencies of PM1, PM2.5, PM10 and the concentrations of WSIs (water-soluble ions) in PM from different APCDs were obtained. The experimental results show that SCR can increase the mass concentration of PM1 by 52.11%. The concentrations of water-soluble Na+, NH4+, Cl−, and SO42− in PM1 also increase. LLTe (low-low temperature economizer) can improve the PM removal efficiency of ESP (electrostatic precipitator), especially for particles in the size range of 0.1–1 μm. The removal efficiency of water-soluble Na+, NH4+, Mg2+, Ca2+, Cl−, SO42− and NO3− are all above 86% for ESP. WFGD (wet flue gas desulfurization) can remove SO2 and fly ash simultaneously, but will increase the mass concentration of PM1 by 59.41%. The desulfurization slurry is rich in Mg2+, Cl− and SO42− which is richest in PM10 after WFGD. WESP (wet electrostatic precipitator) can further purify flue gas with high humidity and low dust concentration. Through ultralow emission retrofit, the final PM10 emission of the 660 MW unit is 2.04 mg/Nm3.
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