Abstract
Pulsed high voltage with variable pulse duration was applied to a discharge reactor with a needle-plane electrodes, and the NOx removal performance in N2/NO was measured. Moreover the discharge luminous intensity of N2 2nd positive band (SPB) was measured as temporal and spatial distribution. The relationship between NOx removal performance and the luminous intensity of N2 SPB were analyzed with regard to pulse duration and applied voltage. The analyses show the following: (1) The NOx removal efficiency decreases in longer duration than 200ns because the energy injected after 200ns is not effectively used for N radical production. (2) The NOx removal efficiency decreases with increase of applied voltage from 16kV to 22kV. (3) The luminous quantity of N2 SPB has a linear relationship with NOx removal in N2/NO. From this relationship, the temporal and spatial distribution of the NOx removal reaction can be estimated. For one of the application of this estimation, the effect of shortened pulse duration was analyzed.
