1996 Volume 39 Issue 1 Pages 202-210
It has been reported that SO2 and NOx in flue gas can be removed by corona discharge and that pulsed corona discharge is as energy-efficient as electron-beam treatment. A large amount of data is required, however, to assess the industrial application of the corona discharge method to the removal of SO2 and NOx from combustion flue gas. In this study experiments of SO2 and NOx removal from actual and simulated combustion gas have been performed on a laboratory scale, where combustion gas composition, temperature, residence time in the discharge duct, and the polarity of high-voltage electrodes are changed for DC and pulsed corona discharge. The following experimental results are obtained: (1) the increase in H2O and O2 concentration improves SO2 and NOx removal rate, (2) dendritic (NH4)2SO4 powders tend to deposit on high-voltage electrodes, and (3) the electrode polarity has a nominal effect on the removal rate under our experimental conditions.