REMOVAL OF NOX FROM FLUE-GAS BY CORONA DISCHARGE ACTIVATED METHANE RADICAL SHOWERS

Removal of NOx from simulated flue gases has been investigated using a retro-fit type electrode suitable for the generation of a methane rad ical shower by replacing corona wires in electrostatic precipitators. The effects of methane radical injection on the NOx removal rate, ener gy efficiency and by-products were studied. The results showed that th e removal of NOx increased with increasing activation voltage. The ene rgy efficiency of NOx removal was 1-6g[NOx]/kWh for the case of methan e radical injection. Furthermore, it was found that CO2 in combustion flue gases caused a decrease in energy deposition into the flue gas, r esulting in lower NO removal efficiency. Trace amounts of N2O were obs erved as discharge by-products.