プラズマ・化学複合プロセスを用いたディーゼル微粒子, NO_χ, SO_χの湿式同時処理技術(熱工学,内燃機関,動力など)

概要

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Simultaneous removal of NO_x, SO_x and particulates was investigated for both simulated gas and flue gas from the actual diesel engine. The reactor consists of a discharge wire and pyrex glass cylinder, wrapped by the copper mesh where Na_2SO_3 and NaOH solutions flow down along the inner wall of the cylinder. Low resistivity particulates which are charged by the pulsed corona, are collected and removed by the flowing solutions. The plasma was to oxidize NO to NO_2, Na_2SO_3 solution to reduce NO_2 to N_2 and Na_2SO_4 which is non-toxic and water soluble final product. NaOH solution was used to neutralize the sulfuric acids and trace amount of nitric acids in the solutions. As a result, 98% of NO and 75% of NO_x removal at 56eV/mole, and 93% of SO_2 removal regardless of the discharge power, were achieved. As for diesel particulates removal, 88% of efficiency was obtained. This plasma and chemical hybrid process is expected to make a great cost reduction for flue gas treatment system.
2004-03-25