10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Enhancing the Efficiency of Flat-plate Electrostatic Precipitator by a Diffusion Charge Method
Chih-Te Wang, Chang-Chin Chou, Yu-Chau Wang, Shui-Jen Chen, Ken-Hui Chang, WEN-YINN LIN, Institute of Environmental Engineering and Management, NTUT
Abstract Number: 143 Working Group: Control and Mitigation
Abstract Diffusion charging is one of the commonly used collection methods for electrostatic trapping of nano-particles ( dp<100 nm ). Diffusion charging can avoid the direct contact between charging electrode and volatile organic compound (VOC) in treating the waste air. Research has shown that diffusion charging is a practicable method, but there is little experimental evidence for the maximum value of charged particles after charging. Therefore, this research designed a diffusion charger and let the air flow though the charger to generate high concentration ions for particle charging. The factors that can influence particle charging contain ion concentration, particle diameter, and charging time. This research investigated the charge distribution of different particle diameter at various carry gas rate and voltage of diffusion charger. Finally, charged particles stream into flat-plate Electrostatic precipitator to investigate particle penetration at different carry gas rate and voltage. The experimental results indicated that particle charging efficiency, increased with increasing air flow rate and corona voltage of unipolar diffusion charger, The best charging efficiency occur when the corona voltage and air flow rate is 3.3 kV and 3 lpm, respectively. Moreover, 50 nm particle carries 3 elementary charge with ratio of 36.7%, and 100 nm particle carries 6 elementary charge with ratio of 38.9%. Moreover, particle penetration decreased with increasing airflow rate and corona voltage of unipolar diffusion charger, and penetration of nanoparticle was higher than that of submicron-particle (100 nm <dp<1000 nm). Because, the surface area of nanoparticles is too small, it is hard for nanoparticles to get enough charge, and be collected. Therefore, there are a larger proportion of nanoparticles can pass through the flat-plate Electrostatic precipitator, compared with submicron-particles. The diffusion charging method is a feasible method was carried out through an indication of effectiveness of the experimental result. It is adopted both removal of organic waste gas and environment that must avoid the risk of explosion.