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ABSTRACT
With increasing attention on sulfuric acid emission, investigations on the removal characteristics of sulfuric acid aerosols by the limestone gypsum wet flue gas desulfurization (WFGD) system and the wet electrostatic precipitator (WESP) were carried out in two coal-fired power plants, and the effects of the WFGD scrubber type and the flue gas characteristics were discussed. The results showed that it was necessary to install the WESP device after desulfurization, as the WFGD system was inefficient to remove sulfuric acid aerosols from the flue gas. The removal efficiency of sulfuric acid aerosols in the WFGD system with double scrubbers ranged from 50% to 65%, which was higher than that with a single scrubber, ranging from 30% to 40%. Furthermore, the removal efficiency of WESP on the sulfuric acid aerosols was from 47.9% to 52.4%. With increased concentrations of SO3 and particles in the flue gas, the removal efficiencies of the WFGD and the WESP on the sulfuric acid aerosols were increased.
Implications: Investigations on removal of sulfuric acid aerosols by the WFGD and the WESP in the power plants were aimed at the control of sulfuric acid emission. The results showed that the improvement of the WFGD system was beneficial for the reduction of sulfuric acid emission, while the WESP system was essential to control the final sulfuric acid aerosol concentration.
Funding
The authors thank the National Natural Science Foundation of China (No. 21276049), the National Basic Research Program of China (973 Program No. 2013CB228505), the Jiangsu Science and Technology Support Program (No. BE2014856), and the Jiangsu Environmental Monitoring Research Program (1412) for their financial support.
Additional information
Funding
Notes on contributors
Danping Pan
Danping Pan is a Ph.D. student at Southeast University in Nanjing, PRC.
Linjun Yang
Linjun Yang is a professor at Southeast University in Nanjing, PRC.
Hao Wu
Hao Wu and Rongting Huang are Ph.D. students at Southeast University in Nanjing, PRC.
Rongting Huang
Hao Wu and Rongting Huang are Ph.D. students at Southeast University in Nanjing, PRC.
