Dynamic Characteristics of Positive Pulsed Dielectric Barrier Discharge for Ozone Generation in Air

Abstract

A comprehensive dynamic model consisting of 66 reactions and 24 species is developed to investigate the dynamic characteristics of ozone generation by positive pulsed dielectric barrier discharge (DBD) using parallel-plate reactor in air. The electron energy conservation equation is coupled to the electron continuity equation, the heavy species continuity equation, and Poisson's equation for a better description. The reliability of the model is experimentally confirmed. The model can be used to predict the temporal and spatial evolution of species, as well as streamer propagation. The simulation results show that electron density increases nearly exponentially in the direction to the anode at the electron avalanche. Streamer propagation velocity is about 5.26×10 4 m/s from anode to cathode in the simulated condition. The primary positive ion, negative ion, and excited species are O + 2 , O − 3 and O2( 1 ∆g) in pulsed DBD in air, respectively. N2O has the largest density among nitrogen oxides. e and N + 2 densities in the streamer head increase gradually to maximum values with the development of the streamer. Meanwhile, the O + 2 , O, O3, N2(A 3 Σ) and N2O densities reach maximum values in the vicinity of the anode.

Study on Effect of O 2 /H 2 O on CH 4 and NO x Removal with NTP

“…In NTP-CH4-SCR system, H2O could react to form a large number of oxidizing free radicals such as OH and HO2 (eq. ( 21) (22) ( 23)) [27][28][29][30][31][32][33], that promoted the direct oxidation of CH4, so that the CH4 removal efficiency gradually rose and the NOx removal efficiency continued to decline. Figure 13 shows the influence of H2O…”

Experimental study on the influence of H 2 O vapor and O 2 for desulfurization and denitrification of the diesel exhaust in marine application by non‐thermal plasma

“…The applied voltage is 6.5kV, and the discharge duration is 3�10 −5 s, as shown in Figure 3a. Table A1 lists the reactions considered in the model [22,[25][26][27][28][29][30][31][32][33][34][35][36][37]. The simulation results are shown in Figure 9.…”

Effect of airflow on the discharge uniformity at different cycles in the repetitive unipolar nanosecond‐pulsed dielectric barrier discharge

“…As a reliable method to directly generate nonequilibrium plasma at atmospheric air, dielectric barrier discharges (DBDs) have the advantage of flexible structure, good cost performance, low gas temperature, as well as sufficient concentration of active species. [1,2] Therefore, they have wide application prospects in many fields, such as thin-film deposition, [3][4][5] ozone generation, [6,7] biomedical treatment, [8][9][10][11] material processing, [12][13][14] flow control, [15,16] and so on. A DBD has three typical discharge modes, namely filamentary mode, patterned mode, and diffuse mode.…”