Suppression of the ozone generation in the positive and negative dc corona discharges
A. Yehiak1 and A. Mizuno2
1 Department of Physics, Faculty of Science, Assiut University, Egypt
2 Department of Ecological Engineering, Toyohashi University of Technology, Japan
Abstract
The effect of the electrode material on ozone generation in dc corona discharges has been reported, however, some of the reported results conflict. The aim of this paper is to investigate how the characteristics of the dc corona discharges are influenced by material of the discharge wire in both dry air and oxygen-fed reactors. The corona discharges were generated in a coaxial wire-cylinder reactor stressed by positive or negative dc voltage. A set of high purity wires made of different metals, having a constant radii, was tested as discharge electrodes in the reactor. The reactor was fed by either dry air or oxygen flowing with a constant rate at atmospheric pressure and room temperature. As the result, the effect of wire material on the ozone generation characteristics was the most significant with the positive corona in dry air, and not so significant with the negative corona in dry air, nor with both positive and negative coronas in oxygen. It was also confirmed that silver wire was effective to suppress the ozone production in dry air up to about 1/10 compared with that using tungsten wire.
Keywords - Corona discharge, DC corona discharge, Ozone, Ozone generation, Electrostatic precipitators
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