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Improved Decomposition Efficiency of Nitrogen Oxides using Superposing SPCP and Corona Discharges
Woo, In Sung,Kang, An Soo,YAMAGUMA, M .,Kang, Hyun Choon,Cho, Jeong Kuk,Hwang, Myung Whan 한국공업화학회 2001 Journal of Industrial and Engineering Chemistry Vol.7 No.2
The superposing effect of an SPCP(Surface discharge-induced Plasma Chemical Process) and corona discharge were studied for the removal of NO_x, from industrial flue gases. The NO_x, removal rates caused by an SPCP, corona discharge, and superposing discharge were monitored and compared. The parameters included the concentration, flow rate of gas, frequency, and type of discharge. The experimental results showed that the NO_x, removal rate with a superposing discharge was 10∼30% higher than that with the other two modes. The maximum obtainable NO_x, removal rate with only a SPCP (18 W) on a corona discharge (7 W) was 85% and 12%, respectively. However, the combination of the two modes, produced a 95% NO_x removal rate with a discharge power of 18 W with a lower frequency (450 Hz). A higher NO_x removal rate was observed with a lower frequency in the upper electrode in the combined reactor and a higher frequency in the lower electrode. Accordingly, corona discharge (below 600 Hz) in the current study, a combined with an SPCP electrode (at a lower power) appeared to be the best method to remove NO_x.