プラズマを利用した環境汚染物質の防除 (<特集>環境問題)

We have experimentally evaluated the application of a plasma discharge systems to reduce the concentrations of environmental pollutants such as NO_x, SO_x, dust particles and CFCs in the gaseous material. This paper considers CFCs decomposition by arc plasma, NO_x removal by NH_3 and H_2 radicals from mixing plasma, NO_x removal by N_2 corona discharge and NO_x, smoke removal by corona discharge reactor. In addition, the prototype reactors which reduce pollution concentrations are proposed in this study. We found that 1) CFC 12 decomposition rate of above 99% is obtained using the arc plasma jet system. 2) a NO_x removal rate of nearly 100% is observed at a corona input power of 1kW by NH_3 or H_2 radical injection. 3) a NO_x removal rate of about 10% is obtained by the N_2 corona discharge process at a power of 30 watts. 4) soot and NO_x removal rate of 70-90% are observed in a corona coupled reactor system at an input power of several watts.We have experimentally evaluated the application of a plasma discharge systems to reduce the concentrations of environmental pollutants such as NO_x, SO_x, dust particles and CFCs in the gaseous material. This paper considers CFCs decomposition by arc plasma, NO_x removal by NH_3 and H_2 radicals from mixing plasma, NO_x removal by N_2 corona discharge and NO_x, smoke removal by corona discharge reactor. In addition, the prototype reactors which reduce pollution concentrations are proposed in this study. We found that 1) CFC 12 decomposition rate of above 99% is obtained using the arc plasma jet system. 2) a NO_x removal rate of nearly 100% is observed at a corona input power of 1kW by NH_3 or H_2 radical injection. 3) a NO_x removal rate of about 10% is obtained by the N_2 corona discharge process at a power of 30 watts. 4) soot and NO_x removal rate of 70-90% are observed in a corona coupled reactor system at an input power of several watts