抄録
Laboratory-scale and parametric experiments of SO2, and NOx, removal from the simulated combustion gas by pulsed corona discharge have been performed changing the combustion gas composition and temperature, the electrode configuration of plasma reactor and the polarity of high-voltage electrode. The following results are obtained, 1) the higher the concentration of H2O and O2, the higher the efficiency of desulfurization and denitrification at the same specific input, 2) the pulsed corona discharge with a voltage pulse-width as short as 200 ns of negative polarity shows the possibility to attain almost 90% deSOx and de NOx efficiency at the specific discharge input of 20 J/g, which is almost the same as the specific input in the electron-beam process, 3) the de NOx characteristics shows a little temperature dependence in the range of 70_??_130°C, but the de SOx efficiency increases rapidly in the temperature region below 100°C suggesting the thermochemical dependence of deSOx reaction, 4) when desulfurization and denitrification proceed, the white dendritic powder deposits on the plasma reactor which composition is identified to be 49 mol % of (NH4)2SO4 and 47 mol % of 2NH4NO3 • (NH4)2SO4, and the ratio of SO2, NO and NH3 of the deposit is almost equal to that of supplied gas.
