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Fundamental electrical properties of a small-scale electrostatic precipitator.

Farnoud-A; Armendariz-AJ
Proceedings of the AAAR 26th Annual Conference, September 24-28, 2007, Reno, Nevada. Mt. Laurel, NJ: American Association for Aerosol Research, 2007 Sep; :334
Full-scale industrial electrostatic precipitators (ESPs) have been widely used for a century but they have not been miniaturized for use in mobile sources and machinery. There are growing experimental and commercial applications of small-scale ESPs. The objective of this work was to determine the fundamental electrostatic properties of small-scale ESPs. A DC-powered, wire-plate electrostatic precipitator was designed and constructed for this work, with variable geometry internal components. Adjustments were easily made to plate-to-plate and wire-to-plate distances, wire numbers and types, and total plate areas between tests. The exterior dimensions of the ESP were 32 x 22 x 21 cm, and the collection plates were 25 x 15 cm. Onset voltages, sparkover voltages, and voltage-current relationships were obtained for plate-to-plate distances from 1.5 to 2.5 cm, and for wire diameters from 0.125 to 0.5 mm. Experimental data were compared with theoretical electrostatic predictions. The results indicated that some electrostatic properties, like the differences in current production between positive and negative corona operation, and the general parabolic trend in voltage-current, were consistent between small-scale units and predictions using large-scale experience. However, many important differences were found between observed and predicted onset and sparkover voltages and current production. A new electrostatic model was developed to more accurately predicting voltage-current behavior in small-scale ESP's.
Diesel-exhausts; Diesel-emissions; Particulates; Particulate-dust; Fuels; Emission-sources; Airborne-particles; Electrostatic-precipitators; Electrostatic-filters; Electrical-conductivity
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Proceedings of the AAAR 26th Annual Conference, September 24-28, 2007, Reno, Nevada
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Southern Methodist University