Ozone Generation in an Electrostatic Precipitator With a Heated Corona Wire

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Abstract
The body of information in this paper is directed to individuals involved in the design of electrostatic precipitators or of any devices utilizing the corona discharge where the ozone generation is considered to be a problem. A method that gives as much as 85 % reduction in the ozone generation per unit corona current for a given corona wire is described. The electrical parameters governing the formation of O3 in an electrical discharge are summarized. It is shown that a reduction in the average gas density in the ionized sheath of a corona discharge should lead to lower O3 generation. Experiments were carried out with an a.c. heating current being used to heat a corona wire in a cylindrical geometry corona section. It was found that as the heating power applied to the wire increased, the O3 generation per unit corona current decreased for both positive and negative corona. An experimental formula was obtained that relates the heating power to the O3 generation with and without heating for positive corona. This formula was based upon experimental work carried out on corona wires of different materials and sizes and at flow conditions typical of two-stage electrostatic precipitators. The reduction in the O3 concentration is believed to be caused primarily by the reduced corona power dissipated in the ionized sheath under heating conditions. These results have great practical importance for improving the performance of the two-stage type electrostatic precipitator as it allows the corona current and hence charging efficiency of the unit to be increased without exceeding the O3 limits.

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