Effects of O2 and H2O on SO2 removal by dielectric barrier discharge at various temperatures

Abstract

Theoretical and experimental analyses of SO2 removal with dielectric barrier discharges are carried out in a broad temperature range. With an increase in temperature, E/N (electric field strength divided by the total gas density) increases. When E/N increases from 100 to 300 Td, the electron mean energy increases by 91% and the proportion of high-energy electrons also increases. In the SO2/O2/N2 system, the increase in O2 content promotes the production of O atoms, enhancing the removal of SO2, and an increased temperature generates more active species and also increases the rates of SO2 removal reactions, reflecting a marked improvement in SO2 removal. In the SO2/H2O/O2/N2 system, H2O can increase SO2 removal efficiency, but a high water content prevents SO2 removal. As the temperature increases, the generation of active species and SO2 removal reactions are both promoted, intensifying the removal of SO2.