Abstract: Positive DC corona discharge is formed with needle-plate electrode
configuration, in which the water vapor is ejected though the needle points.
The purpose is to increase the numbers of the water-based radicals, ionize the
water molecule and improve the desulfuration efficiency of pulsed corona
reactor. The water ions were determined by four stages molecular beam mass
spectrometer and diagnose the water-based radicals by emission spectrograph. A
conclusion on formation of ions and radicals with DC corona discharges can be