ELECTROSTATIC ENHANCEMENT OF FINE DUST FILTRATION IN A GRANULAR BED FILTER

Park, O. H.; Park, M. S.

Environmental Engineering Research 2001;6(2): 109-116.

O. H. Park^†, and M. S. Park

Department of Environmental Engineering, Pusan National University, Pusan 609-735, Korea

Corresponding Author: O. H. Park ,Tel: +82-51-510-2415, Fax: +82-51-510-2415, Email: ohpark@hyowon.pusan.ac.kr

Received: December 17, 2000; Accepted: May 17, 2001.

ABSTRACT

An experimental study was conducted to investigate the performance variation of dust collection with various factors such as applied voltage, filtering media, dust load, granule velocity, and gas velocity in an electrostatically enhanced MGBF (moving granular bed filter). Fly ash removed from an electrostatic precipitator of a power plant was used as sample dust. The performance of silica-sand and glass-beads as filtering media were compared with each other. When DC voltage was applied to the unit, the overall collection efficiency of dust particles ranging from 0.5 μm to 3 μm improved as voltage and the number of electrodes increased. As the applied voltage increased, the effects of inertia force on the collection of relatively large dust particle(d_p > 2 μm) decreased. An increase in the granule subsiding velocity can negatively affect dust removal, but an appropriate application of voltage can control the effect. Silica-sand and glass-beads appear to have good characteristics as filtering media of electro-GBF, which appears to be applicable to some industries as a main treatment unit. Silica-sand appeared to perform better than glass-beads due to the irregular shape and surface roughness of sand.

Keywords: collection efficiency | electrostatic enhancement | filtering media | granular bed filter | performance