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As SO 3  endangered the industrial equipment and environment in the coal-fired power plants, it was necessary to give full play to the SO 3  removal effect in a low-low-temperature electrostatic precipitator (LLT-ESP). The relationship between SO 3  and fly ash particles was investigated during the cooling process. In addition, the SO 3  removal performance in the LLT-ESP was further analyzed. The migration and deposition of SO 3  into fly ash particles were promoted with the decrease in the gas temperature and the fly ash particle size, as well as the increase in the SO 3  concentration. As the temperature of the gas decreased below the acid dew point (ADP), the H 2 SO 4  vapor tended to migrate into fly ash particles with smaller sizes. The SO 3  mass concentration increased significantly in fly ash particles whose sizes ranged from 0.03 to 0.26 μm. When the operating voltage turned up, the SO 3  removal efficiency was increased from 43.2% to 60.1%. The increase in the inlet fly ash concentration promoted the SO 3  removal, and the removal efficiency increased by nearly 20%. When the gas temperature was below the ADP, it had little influence on the SO 3  removal efficiency.

Removal characteristics of SO 3 in the low-low temperature electrostatic precipitator