Abstract
The collection efficiency of lab-scale, two-stage electrostatic precipitator comprising a dual-corona particle precharger and parallel-plate particle collector for the removal of PM2.5 particles was investigated in this paper. In the precharger stage, particles conveyed by a gas were electrically charged by ionic current in corona discharge, and in the collection stage, the charged particles were removed from the gas by DC electric field between two parallel-plate electrodes. For the same electrode geometry, the precharger can operate as unipolar or bipolar precharger and/or agglomerator, depending on the mode of electrode supply. The collection efficiency of the system was determined for various modes of precharger electrodes supply with DC or AC voltage. The measurements have shown that number collection efficiency for PM2.5 particles was higher than 80% for the system with dual-corona unipolar precharger supplied with AC voltage and >90% for supply with DC voltage of negative polarity. For the same system, mass collection efficiency was >90% and >96% for PM2.5 particles when precharger was supplied with AC and DC voltages, respectively.
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