Removal Of NO From The Gas Stream Via Dielectric Barrier Discharge

Dielectric barrier discharge has a good application prospect in the field of gaseous pollutants removal reduction, because of the character of high electron density and atmospheric operation among non-thermal plasma technology. Removal effects of NO in the fuel gas was determined by the micro-discharge and chemical kinetic mechanism of dielectric barrier discharge. So the cylinder-tube dielectric barrier discharge reactor was used to study the removal process of NO in the simulated flue gas in the paper. The effect of NO removal by dielectric barrier discharge was studied from three aspects that were electrical parameter, gas physical properties and gas composition respectively. The results showed that the smaller discharge gap was, the easier discharging was. When the power frequency was fixed, the input power and the removal rate of NO increased with increase of the discharge voltage. The removal rate of NO decreased with the increase of discharge frequency in the range from 4.94kHz to 20kHz of power output frequency. The removal rate decreased with the increase of gas flow and reactor NO concentration at reactor inlet. The flue gas temperature (100℃-150℃) had little effect on the removal rate of NO. Addition of Ar decreased the breakdown voltage. SO2, H2O and O2 inhibited NO removal removing, and that SO2 and H2O promoted the oxygenation of NO to turn into NO2. This work provided experimental data for the dynamic analysis of gas interaction mechanism in the reactor.