Hot-side, single-stage electrostatic precipitator having reduced

Details Hot-side, single-stage electrostatic precipitator having reduced Hot-side, single-stage electrostatic precipitator having reduced

1992-05-01

1994-02-01

Chiesa, Richard L.

Gas separation: apparatus

Electric field separation apparatus

Plural diverse electric fields

96 97, 96 98, B03C 341

Patent

active

052828913

ABSTRACT:
An improved hot-side electrostatic precipitator is provided which more efficiently removes particulates such as fly ash from gases by substantially decreasing the occurrence of back corona discharge. The improved hot-side electrostatic precipitator is based upon the discovery that back corona discharge occurs primarily, if not entirely, in the accumulated particle layer in those sections of the collection plates having a temperature low enough to initiate back corona discharge.
Based on this recognition, the corona electrodes and collection plates of the present invention define an upper laterally extending primary operating region having a temperature substantially throughout that is greater than a first value and having at least a portion with a localized electric field strength in the primary operating region greater than a second value, and a lower laterally extending secondary operating region having a temperature substantially throughout that is less than the first value and a localized electric field strength substantially throughout that is less than the second value. The first and second values are selected so that the likelihood of back corona discharge is reduced.

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IEEE Standard 548-1981 Guidelines for the Laboratory Measurement and Reporting of Fly Ash Resistivity, pp. 7-30 (1981).

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