Abstract

We propose a new type of corona reactor for NO_x treatment in fuel burned exhaust gas. The reactor operates with positive DC corona discharge on saw-edge electrode ovet water surface. The positive DC corona produces effective radicals for NO oxidization and helps NO2 dissolving into water with corona wind blowing down to water surface. First we show the positive and negative Dc corona characteristics results rvater surface with multi needle and saw edge electrodes. Then we show some typical experimental results of NO_x treatment tests with diesel exhaust gas and dry NO test gas. The experiments were carried out under some different discharge modes and inlet gas concentrations to find the best operative condtions of this reactor and to investigate the possible radicais or reartions as the effect of water existence. We got more than 95% removal rate of NO* with 200 ppm dry gas by positive corona with water. In case of diesel exhaust gas, more than 90%o of NO_x removal could be achieved with and without u,l:er, The results of our experiments suggest that existence of water molecules (as vapor or fume) and OH radicals in the reactor are important for performing the effective reactions of NO* removal processes.