Abstract
Pulse excitation was applied to a laboratory electrostatic precipitator (ESP). Measurements were made to obtain experimental data which would assist in understanding and evaluating the basic concepts of pulse excitation. The electrical characteristics of interest were the peak voltage d.c. voltage, corona current and current distribution over the collector plates. These characteristics were measured at 150° C (300° F) under both clean and high resistivity dust (6 × 10 12 ohm cm −1 ) conditions. The results show the changes in the voltage-current relationship due to high resistivity dusts and also provide a basis for selecting operating conditions. The charging and collecting characteristics of the ESP with pulse and d.c. excitation were compared by measuring charge/mass ratios, mass penetration and opacity. Although the d.c. field strength was less with pulse excitation than with d.c. excitation, the charging and collecting of high resistivity dust were improved. This was due to a combination of the peak voltage and the evenly distributed unipolar current.
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