Evaluation of Charged Water Sprays for Dust Control

摘要

Charged sprays and fog were evaluated for reducing respirable dust concentrations. Charged spray technology was reviewed for effectiveness, equipment, and theoretical considerations. A mathematical model was developed for predicting dust reduction effects. Laboratory tests were made showing charged spray is considerably more effective at reducing dust on a unit water basis than hydraulic spray. Positive and negative sprays are equally effective. Combined polarity sprays are considerably less effective than either polarity alone. Little difference in effectiveness by dust type was observed. The charged cloud can present a spark hazard in explosive atmospheres; however, because of this hazard, this technique must not be used in gassy mines.