1988 Volume 23 Issue 4 Pages 191-198
Experimental studies have been undertaken on NO and SO2 oxidation by pulse-corona-induced plasma chemical process (PPCP) at a pulse voltage of a 100 ns rise time. The exhaust gas from a municipal refuse incinerator added with NO and SO2 were led to a concentric cylinder corona system. As both waveform of pulse voltage and gas residence time were constant, the removal efficiency (η) can be expressed as follows:η= 1-exp (-kf) where f is a pulse frequency ranging from 50 to 250 Hz and k is a constant coefficient. Therefore, NO removal efficiency (ηN) and SO2 one (ηs) increased with increasing frequency. The pulse corona power required to gain the same ηN was only 10-20% of direct current one.ηN increased with increasing CO concentration, while ηs decreased as well as Hg vopour removal efficiency. From chemical analysis, it was found that the decrease in NO concentration was mainly due to the oxidation of NO and that the NOx concentration remained almost constant. The reaction was influenced by the concentration of O2, H2O, CO, etc. in exhaust gas. This may imply that the active species such as O, OH, HO2, etc. produced by intense corona discharge were concerned with these reactions.
