No Removal by NS Pulsed Streamer Discharge

Summary form only given. The conventional methods such as SCR method, Electron Beam method and Lime-gypsum method could not treat exhaust gases completely. In addition, the energy efficiency and the cost in the conventional ways are still negative situation. In recent years, the pollution control techniques using electric discharge plasmas which could attract attention as the low cost and high energy efficient exhaust gas treatment method, have been widely studied. In our laboratory, pulsed streamer discharge plasmas which are one of the non-thermal plasmas have been used to treat exhaust gases. Since a pulse width of applied voltage has a strong influence on the energy efficiency of the removal of pollutants, the development of a short pulse generator is of paramount importance for practical applications. In this work, ns pulse generator which can output the 5ns pulsed voltage is developed. Furthermore, the NO removal experiment is conducted using the ns pulse generator. As the results, the ns pulsed discharge has an advantage in energy efficiency for NO removal in comparison with sub-mus pulsed discharge. As the characteristics of NO removal using the ns pulsed streamer discharge, the polarity of and the amplitude of applied voltage to the reactor have significant influences on the improvement of energy efficiency of NO removal. On the other hands, it is clear that the longer length of and the smaller diameter of the coaxial discharge reactor give the higher energy efficiency. The maximum energy efficiency of NO removal by ns pulsed streamer discharges reaches 1.5 mol/kWh at 60% of NO removal ratio.