Abstract
The emission of reverse ion current from high resistivity dust layers is of significance in electrostatic precipitator (ESP) applications because of the severe negative impact it has on collection performance. In this paper we describe a transient experimental technique which was developed to determine the ratio of forward to reverse current which flows when a dust layer is electrically stressed. Results for fly ash particles of different electrical resistivity are presented and it is demonstrated that for high resistivity (>10 11Ω cm) fly ash, reverse current injection sets in at current densities well below those normally associated with practical precipitator operation. It is also shown that ratios of reverse to forward current greater than one are easily obtained and that reverse current injection can be initiated at electrical stresses below those associated with macroscopic electrical breakdown of the layer.
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