Abstract
The aim of this paper is to analyze the influence of flow rate versus concentration on the efficiency of dry NO_x reduction process in nitrogen plasma environments. The simulated gas is obtained by diluting 2L/min 2% NO gas (N_2 balanced) with 0〜18 [L/min] N_2. The experimental setup consists of the versatile plasma discharge reactor unit powered by 10kHz pulse HV supply and supplied by mass flow controllers with the simulated (NO+N_2) gas. The measurements are obtained by the means of a gas analyser for NO/NO_x concentration and a digital oscilloscope supplied with HV and current probes for discharge power computation. The gas flow rate and concentration are studied while aiming at 30g(NO_2)/kWh energy efficiency with over 86% reduction efficiencies. These targets are keys to industrial application of plasma discharge reactor, as a way of reducing NO_x from the regeneration phase, in the next generation diesel exhaust aftertreatment system. Further studies could also prove the observations in this study useful for similar VOC reduction applications.
