Abstract
Due to the relatively high deNOx efficiency and the compactness, the pulsed-discharge deNOx process is considered to be one of the candidates for deNOx processes of combustion gas. However, a sufficient guidance for the optimum operation condition has not been presented. In this study, we have simulated the pulsed-discharge deNOx process by solving the Boltzmann equation for discharge electron and the deNOx chemical reaction equations simultaneously, and have clarified the effect of exhaust gas composition, temperature and pressure on the deNOx performance. When the oxygen concentration of exhaust gas increases, only the conversion from NO to NO2 proceeds keeping the removal efficiency, the energy consumption and the reduction ratio almost constant. When water vapor concentration increases, reactions NO→HNO2 and NO2→HNO3 proceed due to the increased OH concentration resulting that the reduction ratio decreases, and both the removal efficiency and the energy consumption are improved drastically. When the gas temperature increase, the generation of NO increases by the N radical reaction with CO2 and O2 resulting that both the removal efficiency and the energy consumption deteriorate. When the gas pressure increases, the removal efficiency and the energy consumption decreases by decreasing ratio of the produced electron and radicals density to combustion gas density.
