Five years of full-scale utility demonstration of pulsed energization of electric precipitators
- Madison Gas and Electric Co., WI (United States)
- Environmental Elements Corp., Baltimore, MD (United States)
- Ion Physics Corp., Atkinson, NH (United States)
In a conventional electrostatic precipitator (ESP) the applied dc voltage fulfills three functions: (1) generation of negative ions, (2) charging of particles, and (3) transport of the charged particles to the collecting plates. In the case of high resistivity fly-ash (often associated with the burning of low sulfur coal) the dc voltage is limited by repeated electrical discharges and in extreme cases by back-corona. Lowering the applied dc voltage reduces sparking and back-corona, but also reduces the field on the discharge wires and leads to poorly distributed ion generation as well as reduced charging and particle transport forces. Pulsed energization, which consists of superimposing high voltage pulses of short duration onto the existing base dc voltage, offers an attractive way to improve the collection efficiency of ESPs suffering from poor energization. The superimposed pulses become responsible for uniform ion generation while the underlying dc field continues to fulfill the function of particle charging and transport. This paper describes the five-year test of the ESP at Madison Gas and Electric`s Blount Station.
- OSTI ID:
- 389954
- Report Number(s):
- CONF-960426--
- Country of Publication:
- United States
- Language:
- English
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