Study on high concentration ozonizer using barrier discharges of rare gas -oxygen mixture

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Ozone production efficiency in atmospheric dielectric barrier discharges of oxygen-rare gas mixture and pure oxygen was experimentally investigated, and the discharge properties of these discharges were also investigated using one-dimensional fluid model.The rare-gas-content dependence of ozone production efficiency for various discharge gaps was investigated using a 60 Hz power source. The efficiency measured for the discharge gap shorter than 1.0 mm decreased with the increase in rare-gas content, while the efficiencies in the cases of Ne and Ar Mixtures for the gap of 3 mm increased with the content until the content reached 80%. The ratios of the efficiency at 80% content to that at pure oxygen were 1.4 for Ne and 1.1 for Ar.The ozone production efficiency was investigated in a planar disk type barrier discharge of oxygen using a time-modulated power supply. The efficiency measured using the time-modulated power supply, which was a decrease function of the power injected into the d … More ischarge, was higher than that measured using a continuous. wave power supply. The maximum improvement of the efficiency reached about 20%.The influence of oxygen addition on discharge properties of high-pressure Xe dielectric barrier discharges was investigated using a one-dimensional fluid model. With the increase in the oxygen content, the waveform of the discharge current during a half cycle was changed from sharp and shallow pulses to only a sharp current pulse. The electronegativity in a discharge gap, which depends on the oxygen content, was varied spatially and temporally. despite of small addition of oxygen, dominant positive and negative charged species were change from Xe^+_2 ions and electrons to O^+_2 and O^-ions.A self-consistent one-dimensional fluid model of low-frequency oxygen barrier discharges at atmosphereic pressure was developed to investigate the discharge structure. Mode 1 results indicated that the type of the discharges may be multiple Townsend-like, because the maximum of the charged species density is lower than 10^<10> cm^<-3>. The calculated ozone production efficiency was compared with the experiment, showing the reasonable agreement. Less