Oxygen effect of high concentration NO removal using an intermittent DBD

We developed the ammonia radical injection system for converting Nitric oxide (NO) into harmless products, where the radicals are generated in a separate chamber from NO flow chamber. NO gas is not in the plasma. In order to confirm the energy efficiency of DeNO(x) using an intermittent dielectric barrier discharge source, the NO concentration is increased to 3000 ppm by varying the oxygen concentration from 2% to 5.6%. Using lower temperature operation with the dielectric barrier discharge it is possible to obtain a higher DeNO(x) rate. At an applied voltage slightly higher than the threshold voltage for plasma initiation, the removal amount of NO reaches maximum presenting maximum energy efficiency. In particular, for a designated oxygen concentration, in our case, 5.6% and a duty cycle of 5-10%, a high-energy efficiency of 98 g/kWh is obtained. (C) 2004 Elsevier Ltd. All rights reserved.