title: Performance of a pilot-scale wet electrostatic precipitator for the control of sulfuric acid mist.
abstract: The use of a wet electrostatic precipitator (WESP) is often regarded as a viable option to reduce sulfuric acid mist emitted from the wet flue gas desulfurization (WFGD) tower in coal-fired power plants. In this study, a pilot-scale wet electrostatic precipitator equipped with a wall-cooled collection electrode is investigated for the control of sulfuric acid mist from a simulated WFGD system. The results show that due to partial charging effect, the removal efficiency of sulfuric acid aerosol decreases when the aerosol size decreases to several tens of nanometers. Moreover, due to the plasma-induced effect, a large number of ultrafine sulfuric acid aerosols below 50 nm formed at a voltage higher than 24 kV inside the WESP. The percentages of submicron-sized aerosols significantly increase together with the voltage. To minimize the adverse plasma-induced effect, a WESP should be operated at a high gas velocity with an optimum high voltage. Even at a high flue gas velocity of 2.3 m s(-1), the mass concentration and the total number concentration of uncaptured sulfuric acid aerosols at the WESP outlet are as low as ca. 0.6 mg m(-3) and ca. 10(4) 1 cm(-3) at 28 kV, respectively. The corresponding removal efficiencies were respectively higher than 99.4 and 99.9 % and are very similar to that at 1.1 and 1.6 m s(-1). Moreover, the condensation-induced aerosol growth enhances the removal of sulfuric acid mist inside a WESP and enables a low emission concentration of ca. 0.65 mg m(-3) with a corresponding removal efficiency superior to 99.4 % even at a low voltage of 21 kV, and of ca. 0.35 mg m(-3) with a corresponding removal efficiency superior to 99.6 % at a higher voltage level of 26 kV.
authors.affiliation: Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Jiayu
authors.initials: J
authors.lastname: Huang
authors.affiliation: Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. hongmei.wang@hotmail.com.
authors.forename: Hongmei
authors.initials: H
authors.lastname: Wang
authors.affiliation: Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China. shiaei@sina.com.
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Dang
authors.affiliation: School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Shu
authors.affiliation: Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Deng
authors.affiliation: Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000517:prevention & control*; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D010865:Pilot Projects; D055672:Static Electricity; D013464:Sulfuric Acids / Q000032:analysis*
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D013464:Sulfuric Acids; C033158:sulfuric acid
keywords: Condensation-induced aerosol growth; Plasma-induced effect; Sulfuric acid mist; Ultrafine aerosols; Wall-cooled collection electrode; Wet electrostatic precipitator (WESP)