Demonstration of flue gas cleaning by positive pulsed corona discharge process

Pilot-scale pulsed corona discharge process was applied to the removal of SO₂ and NO_x from iron-ore sintering due gas. We made use of a two-stage magnetic pulse compression modulator to produce repetitive high voltage pulses. The dependencies of variables such as channel width, voltage level and dust content on power delivery were examined. In this system, we were able to deliver pulse power with peak voltage of 140 kV and peak current of 3.3 kA to the corona reactor. Under spark-over voltage, the energy delivered per pulse was almost similar regardless of the channel width. The energy conversion efficiency of the magnetic pulse compression modulator was not largely affected by the voltage level and the channel width, and around 65%. The dust content in the flue gas up to 4.6 g/Nm³ did not have any influence on the power delivery. The maximum energy intensity that can be obtained was 0.5 J/pulse/m and 0.44 J/pulse/m when the channel width was 300 mm and 200 mm, respectively. More than 90% and 80% of SO₂ and NO_x could be removed in the corona reactor in the presence of additives such as ammonia (NH₃) and propylene (C ₃H₆)