Function of an electrostatic precipitator using bipolar corona discharges

摘要

The discharge spikes in the ionizer of the ESP (electrostatic precipitator) with bipolar corona-discharge are arranged not only in the energized-plates but also in the grounded-plates. The discharge from the spikes in the grounded-plates generates ions of opposite polarity to those from the energized-plates. A two-stage-type ESP with bipolar-corona discharge is composed of the ionizer and a collector to which DC high voltage is applied. In the previous test, this bipolar collection method, using positive and negative discharges simultaneously, proved that the particles were enough collected. In this report, discharge-current-density and attached-particles on the ionizer-plates have been discussed in order to clarify the charging-mechanism in the bipolar discharge.