Effect of Electrode Configuration and Corona Polarity on NO Removal by Pulse Corona Plasma

NO_x emission (mainly NO) from industrial boilers and other sources can cause harm to public health and ecosystem. In recent years, non-thermal plasma processes including pulse corona for gaseous pollutants control have received many attentions. For pulse corona discharge, electrode configuration and pulse polarity may have influence on NO_x removal through their effect on the generation of active de-NO_x species. In this study, NO removal efficiencies under different electrode configurations were compared, and effect of pulse polarity on NO removal was also studied. Experimental results indicate that the highest de-NO efficiency was obtained when hybrid nozzle-wire electrode worked in the positive pulse corona regime. When propene was used as de-NO additive, NO removal rate reached 79.5%, and the corresponding energy yield was 126.4 g(NO)/kWh.