Abstract
In order to develop methods of plasma injection for removing pollutants such as NOx and SOx contained in combustion exhaust gas, the authors have investigated radical formation in Ar and N2 arc plasma. It has already been concluded that the NOx removal efficiency has a maximum value in the low range of plasma power. In this paper for the purpose of further savings of the electrical energy in practical use, N2 gas is excited by passing through a corona discharge tube in a high-voltage field, and produced nitrogen radicals are mixed with simulated exhaust gas (N2+O2+CO2+H2O+NO) to reduce the NOx contained in gas. The O2 and H2O contents have no effect on the NOx reduction, and CO gas from CO2 is not generated. The NOx reduction ratio of about 10% is obtained by N2 corona discharge under the input power of 30 watts.
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