The Effects of Inner Electrode Diameter on the Performance of Dielectric Barrier Discharge Reactor for Desulfurization and Denitrification

The inner electrode diameter on performances of dielectric barrier discharge reactor for desulfurization and denitrification was systematically investigated in H2O/O2/SO2/NO/ C3H6/CO2/N2 system. For analysis of the mechanism, the emission intensity of $\text {O}({\text {3p}}^{{5}}\text {P}\to {\text {3s}}^{{5}}\text {S}_{{2}}^{{0}})$ and $\text {OH}\left({\text {A}^{{2}}\sum ^{+}\to X^{{2}}\prod }\right)$ , gas temperature, and reduced field strength (E/N) were measured by optical emission spectra (OES). The experimental results show that increasing of inner electrode diameter can improve the oxidation degree of NOx and reduce energy consumption. For SO2 removal, the SO2 concentration at the outlet of the dielectric barrier discharge (DBD) reactor decreases linearly with the increase of specific energy density (SED) for different inner electrode diameter, and inner electrode diameter has little effect on SO2 removal. Increasing SED can increase the emission intensity of OH and O radicals, which makes more SO2 been oxidized to SO3 and H2 SO4 by O and OH. The DBD reactor with a bigger inner electrode diameter has a lower gas gap temperature and higher E/N under the same SED, which effectively improves the electron energy, increases the formation of oxidative radicals, and reduces energy consumption.