Removal of NO/sub x/ and SO/sub 2/ in flue gas by corona plasma reactor with water film

Summary form only given, as follows. NO/sub x/ and SO/sub 2/ removal methods using plasma chemical reactions in nonthermal plasma have been widely studied. In this paper, a novel type of corona discharge model with water film was designed. The reactor is composed of needle-plate electrodes that are placed in a glass container filled with the flue gas, (the plate electrode is immersed in the water). The influence of positive and negative DC high voltage on the removal rate of NO/sub x/ and SO/sub 2/ was studied. In addition, the effects of water on removal rate of NO/sub x/ and SO/sub 2/ were confirmed by comparing the experimental results tested by the same reactor with and without water. In the reactor, gas-phase discharge plasma directed to the surface of the water film greatly enhanced the liquid-phase oxidation of S (IV) to S (VI). The results show that the corona wind forming between high-voltage electrode and water film by corona discharge enhances the cleaning efficiency of the flue gas, and the cleaning efficiency will increase with the increase of applied voltage. According to this effect, the corona plasma reactor is used to treat the flue gas of the boiler burned coal, and the results show it not only makes the removal efficiency of dust up to 100%, but also makes about 95% and 85% of SO/sub 2/ and NO/sub x/ removal respectively under suitable conditions. This can be the foundation of the improvement on the traditional electrical dust precipitator for the prevention of acid rain.