Research On Dielectric Barrier Discharge Power And Its Discharge Characteristics

The paper was designed a variety of dielectric barrier discharge (DBD) reactors, including small power discharge device using for discharge experiments and large power discharge device for bench experiments in300℃environment. A medium-frequency &high-voltage pulsed power source was also developed and a reliable over-current and over-voltage protecting circuit was designed. The source has been matched on various discharge devices to form steady discharges.The paper research on discharge characteristics by its power and discharge device. The first, the characteristic of DBD was By ICCD. The second, the strength of the discharge spectrum was taken to be the reference for the discharge power consumption research. It was compared that the power consumption of the pulsed power source with that of the sinusoidal wave power source with the same spectrum strength. Results shows that to yield the peak spectrum of N2with the same strength, the power consumption is different for different frequency even for the same souce. Thus there exists a best frequency to save the power for each source. It is shown that for different kinds of sources, the power consumption is also different. Generally speaking, the power consumption of the pulsed power source is much lower than the sinusoidal wave source, thus the pulsed power source may be excepted to reduce the energy consumption of DBD in practice. The analysis of the relationship between excitation temperature and discharge power proved that the efficiency of the pulsed power source was higher and the radiation strength of active particles was stronger.Using the power supply and discharge device, combined with selective catalytic reduction method, the NOx removal character investigated in diesel engine bench exhaust. Using C3H6as reducing agent, the experiments for bypass steam and all flow were carried out on diesel engine bench to remove NOx. It was shown that for condition1(1398r/min and69.9N·m) the oxidation rate of NO was about50%and for condition2(1829r/min and19.9N·m) nearly100%NO was oxidized to NO2,but NO_X removal rate is only16%.