Collection Performance of an Electrostatic Precipitator using Bipolar Corona Discharge
A. Katatani1, H. Hosono1, H. Murata1, and A. Mizuno2
1Panasonic Ecology Systems Co., Ltd, Japan
2Department of Environmental and Life Sciences, Toyohashi University of Technology, Japan
Abstract— Two-stage ESPs (electrostatic precipitators) are composed of ionizers and collectors. DC high voltage is applied to the discharge electrodes in the front stage ionizers. Particles passing through the ionizers with either positive or negative corona are charged. The rear stage collectors with uniform dc electric field catch the charged particles. Spike-type discharger electrodes are widely adopted. In this test, spikes are provided not only in the energized-plates but also in the grounded-plates of the ionizer. The test results show that the particles are collected by generating both positive and negative-corona discharges in the ionizer. The discharge in the grounded-plates generates ions of polarity opposite to those of the energized-plates. This bipolar collection method, simultaneously using positive and negative discharges, shows that the particles are caught not only on the grounded-plates but also on the energized-plates in the collector. The results of this study imply suppression of re-entrainment and longer wash-interval of ESPs.
Keywords— Electrostatic precipitator, DC corona, positive discharge, negative discharge, bipolar, spike