Experimental study on DC corona charging characteristics of powder particles with different properties

Abstract In this paper, the charging characteristics of powder particles with different properties under DC discharge corona conditions were studied experimentally. The influence of different charging voltages and different charging structures on the charge-mass ratio of particles was analyzed through ELPI measurement. The experimental results show that the far-field charging structure of the electrode can effectively charge powder materials like Graphite micro powder, copper sulfide, talcum powder, and porous material (Si Al) within the particle size range of 0.1 μm−10 μm; When there is no streamer or spark between the charging electrode and the grounding electrode of the charging device, the higher the charging voltage is, the higher the degree of air ionization is, and the better the charging effect on particles is; Under the same charge condition, the charge-mass ratio of particles decreases with the increase of particle size.