Removal of NO_xand SO₂from Air Excited by Streamer Corona: Experimental Results and Modeling

Abstract

The effect of pulse corona discharge on NO x and SO2 concentrations in air has been studied. The initial concentrations and ammonia addition have been shown to influence the removal efficiency. An SO2 removal efficiency of 96% and an NO removal efficiency of 70% in pulse corona have been achieved with ammonia addition, for initial SO2 and NO concentrations of 480 ppm and 230 ppm, respectively. A numerical model for NO and SO2 conversion in homogeneous gas flow has been developed. The spatial nonuniformity of gas parameters associated with the existence of many streamer channels in a discharge chamber is taken into account. A comparison between experiments and modeling shows that SO2 removal is mainly determined by OH and O3 -. NO conversion is achieved the reactions of O3, OH and N.

N Atom Radicals and N2(A3∑u+) Found To Be Responsible for Nitrogen Oxides Conversion in Nonthermal Nitrogen Plasma

“…The conclusion that N radicals are responsible for NO conversion is widely accepted. 12,13,16,[24][25][26][46][47][48] The following reactions are used to explain the experimental observation that the N 2 O concentration profile experiences a maximum when CO is absent, but the maximum disappears when 1% CO is added to the NO/N 2 mixture:…”

Production and Removal Mechanisms of Discharge NOxTreatment in N2/O2Gas Mixture

“…This model considers an effect of the diffusion process. 18,19,21) Data for the cross sections were obtained from Phelps and Pitchford. 22,23) for N 2 and O 2 and from Zipf et al 24) for N 2 dissociation.…”

“…We adopted the approximate diffusion process to the radial direction employing the following method. 18,19,21) Assuming the Gaussian distribution as the solution of the diffusion equation in the radial direction of the streamer in an infinite medium, the time-spatial distribution of the concentrations of species is given by the following equation:…”

“…There are several studies taking the excited N radicals into consideration. 1,18,19) However, there is no quantitative analysis on the effect of the excited N radicals in these studies.…”

New prototype for the treatment of falling film liquid effluents by gliding arc discharge part I: Application to the discoloration and degradation of anthraquinonic Acid Green 25

“…These devices are characterized by appropriate electrical power supply modes. Among the most utilized techniques, there are (i) the electron beams reactors [5][6][7]; (ii) the corona discharges [8][9][10]; (iii) the dielectric barrier discharges (DBD) [11,12]; and (iv) the gliding arc discharges (GAD) [13][14][15][16][17][18][19][20].…”