Diesel PM Collection for Marine Emissions Using Double Cylinder Type Electrostatic Precipitator

H. Kawakami¹, A. Zukeran², K. Yasumoto¹, T. Inui¹, Y. Ehara³, and T. Yamamoto³

¹ Road Systems Engineering Department, Fuji Electric Co., Ltd., Japan
² Department of Electronic & Electrical Engineering, Kanagawa Institute of Technology, Japan
³ Department of Electrical & Electronic Engineering, Tokyo City University, Japan

Abstract

Low resistive particulate matter (PM) generated from marine engines or diesel generators has been known to be difficult to collect by the conventional electrostatic precipitators (ESP). In the present study, the double-cylinder type ESP (DC ESP) was developed to remove low resistive diesel exhaust particles. Two ESPs, namely, the conventional singlecylinder type ESP (SC ESP ) and DC ESP were investigated using a 6728 cc engine. The particle size-dependent collection efficiency was obtained using a Scanning Mobility Particle Sizer (SMPS) for the particle-size range of 40-500 nm and an aerosol spectrometer (AS) for the particle-size range of 300-10,000 nm. The particle mass collection efficiency was obtained using a Low Volume Air Sampler (LVS). The effective of re-entrainment or collection efficiency for two ESPs was compared. As a result, the conventional SC ESP showed good collection efficiency for particle sizes less than 300 nm but showed severe re-entrainment for particle sizes greater than 1000 nm. The DC ESP also showed good collection efficiency for particle sizes less than 300 nm. However, the collection efficiency for particle sizes greater than 1000 nm was significantly improved due to particle capture between double cylinders i.e., suppression of particle re-entrainment. This result was also supported by the particle mass measurement and the filter colour detection by the LVS.

Keywords - Electrostatic precipitator, diesel exhaust particle, re-entrainment, collection efficiency, marine engine

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