Removal of sulfuric acid aerosols in desulfurized flue gas by adding moist air

BACKGROUND The reduction of sulfuric acid aerosol emission in coal fired power plant is of great importance. According to the classical theory of heterogeneous vapor condensation, a novel engineering process was presented to increase the removal efficiency of sulfuric acid aerosols by adding moist air in condensational growth chamber (CGC), which was set after desulfurization scrubber. RESULTS The theoretical analysis showed that this novel process was feasible. The experimental results indicated that the removal efficiency of sulfuric acid aerosols was mainly influenced by the addition amount of moist air and the humiture of desulfurized flue gas and moist air. Higher humiture of desulfurized flue gas could promote the removal efficiency, whereas higher temperature of moist air was unfavorable. However, the influence of the relative humidity of moist air was not obvious. Moreover, the increasing of mixture ratio was also beneficial for the improvement of removal performance in the range below 10:20. CONCLUSION The process proposed in this paper was feasible for industrial application. The removal efficiency of sulfuric acid aerosols could be enhanced to 30-50% by this novel process.