Influence of NO initial concentration on removal efficiency in dielectric barrier discharge reactor

Summary form only given. This paper describes an influence of NO initial concentration on removal efficiency of the multipoint-to-plane geometry DBD reactor. A multipoint type electrode was used as ground electrode in the DBD reactor to reduce an operation voltage. The multipoint electrodes have 528 pyramid shape projections with tip angle of 45deg in an area of 6 cm times 22 cm. An alumina dielectric barrier coated plane electrode was employed as a high voltage electrode, and was set with the gap length of 1 mm. The thickness of alumina dielectric barrier is 0.5 mm. The applied voltage has sinusoidal waveform with 10 kHz frequency. The voltage and current were measured with Tektronix P6015 probe and a Pearson 2877 current probe, respectively. The consumed energy in the reactor was obtained using V-Q Lissajous figure. The gas mixture of N₂:O₂=9:1 containing NO was used with gas flow rate of 5 L/min. The concentration of NO was obtained using Best Sokki BCL-511 NOx analyzer. The logarithm NO concentration with respect to the specific input energy fell on a straight line for each condition. The slopes of each straight line correspond to energy constants of each condition. The calculated energy constants for each conditions were 188, 14 and 1.0 Nm³/kJ for 50, 200 and 400 ppm NO initial concentrations, respectively. The experimental result also showed the removal rate was decreasing with the increase in the NO initial concentration, and the relating energy constant decreased exponentially.