Oxidation of sulfur and nitrogen oxides by pulse corona discharge

The NOx and SO2 removal efficiency of the corona reactor has been measured both with and without ammonia addition to the gas stream. Experimental conditions are described. The dependence of NO and SO2 removal efficiency from flow rate and initial pollutant concentrations were measured. One test with fixed amount of the inputted energy per the unit of SO2 but with different initial concentration have been made. It is found that increasing of the initial concentration from 200 ppm to 700 ppm can enlarge the removal efficiency by factor 2.5. Some tests were carried out with both pollutant gases SO2 and NO simultaneously. An efficiency on the SO2 removal of 96% and on the NO removal 70% in pulse corona have been achieved with ammonia addition when SO2 initial concentration was 480 ppm and the NO initial concentration was 230 ppm. A numerical model for NO and SO2 oxidation in homogeneous gas flow has been developed. The flow contains cold (T = 300-400 K) background components N2, CO2, H2O, O2 and impurities SO2, NOx, CO. A source of chemically active species is an electrical streamer discharge of corona type. (authors)