Title: Suppression of particle deposition onto downstream wall in an AC Electrostatic Precipitator with neutralisation

Authors: Koji Yasumoto, Akinori Zukeran, Yasuhiro Takagi, Yoshiyasu Ehara, Takeo Takahashi, Tairo Ito

Addresses: Road Systems Engineering Department, Engineering Div.2, Electrical Machinery Engineering Group, Fuji Electric Systems Co., Ltd., 1 Fuji-machi, Hino-city, Tokyo 191-8502, Japan. ' Road Systems Engineering Department, Engineering Div.2, Electrical Machinery Engineering Group, Fuji Electric Systems Co., Ltd., 1 Fuji-machi, Hino-city, Tokyo 191-8502, Japan. ' Electrical Application Laboratory, Musashi Institute of Technology, 28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan. ' Electrical Application Laboratory, Musashi Institute of Technology, 28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan. ' Electrical Application Laboratory, Musashi Institute of Technology, 28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan. ' Electrical Application Laboratory, Musashi Institute of Technology, 28-1 Tamazutsumi, Setagaya, Tokyo 158-8557, Japan

Abstract: Electrostatic Precipitators (ESPs) are used to decontaminate polluted environment around the tunnels. A conventional ESP has high collection efficiency but still has a problem in that its downstream walls are polluted due to particle deposition. The experiments carried out in this study have focused on how the particle deposition can be prevented by neutralising the gases. The collection efficiency as a function of particle diameter and the amount of deposited particles on the wall were studied on three types of the ESP: the universal ESP under DC operating mode (DCESP), the ESP under AC operating mode (ACESP) and the ACESP with gas-neutralising equipment (ACESP with neutralisation). Electrostatic field intensity and ion concentration were also measured to understand the state of neutralising the gases. The ACESP, an invention of the authors, prevents particle re-entrainment. The ACESP with neutralisation, which not only prevents the particle re-entrainment but also decreases the charge amount of the downstream gases, was most effective in decreasing the amount of deposited particles.

Keywords: ESP; electrostatic precipitators; re-entrainment; diesel exhaust gas; particle depositon; ion concentration; gas neutralisation; tunnel decontamination; downstream walls.

DOI: 10.1504/IJEWM.2008.021781

International Journal of Environment and Waste Management, 2008 Vol.2 No.4/5, pp.399 - 411

Available online: 04 Dec 2008 *

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