Removal of NO x by DC and pulsed corona discharges in a wet electrostatic precipitator model

Abstract

The object of this investigation was the removal of NO and NO 2 from simulated exhaust gases (N 2 : O 2 : CO 2 : NO 2; N 2 : O 2 : NO) by DC and pulsed corona discharges in reactors simulating a segment of an electrostatic precipitator whose collecting electrodes are irrigated by water. For this purpose two reactors were employed: one had a usual wire-to-plate geometry, the second a multineedle-to-plate geometry. The plates in both reactors were covered by a water film. The results show that an efficient removal of NO and NO 2 from exhaust gas by DC or pulsed corona discharges can be obtained by irrigating the collecting plates of an electrostatic precipitator with water. It suggest that an efficient DeNO x can also be obtained by a suitable electrode arrangement and a suitable energization in wet precipitators.