Pulse power energization effects on ESP efficiency in collection of high resistivity flyash particles

A novel pulse module for enhancing electrostatic precipitator (ESP) performance has been developed and tested using Ontario Hydro's 640 MJ/h Combustion Research Facility. The pulse energization enhanced the performance of the existing DC energized wire-plate ESP by suppressing back corona in collecting high-resistivity flyash (>or=10/sup 10/ Omega -cm). A 26% improvement in particle collection efficiency and a 30% energy saving were obtained with pulse energization in collecting high-resistivity, high-sulfur (3.7%) Nova Scotia coal flyash injected with limestone-water slurry as sorbent. The cold precharger specially designed for the three-stage wire-plate ESP has been tested for its ability to improve the ESP's performance in reducing the back corona. With an additional 30% energy supplied to the precharger it was possible to obtain up to a 40% enhancement in collection efficiency.<
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