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Performances of Nanosecond Pulsed Discharge

100%
Matsumoto T., Wang D., Namihira T., Katsuki S., Akiyama H.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 6
1101-1103
EN
The conventional methods such as selective catalytic reduction method, electron beam method and lime-gypsum method could not treat exhaust gases completely. In addition, the energy efficiency and the cost of the conventional ways are still unfavourable. In recent years, the pollution control techniques using electric discharge plasmas which attract attention as the low cost and high energy efficient exhaust gas treatment methods, have been widely studied. In our laboratory, pulsed streamer discharge plasmas which are one of the non-thermal plasmas have been used to treat exhaust gases. Since a pulse width of applied voltage has a strong influence on the energy efficiency of the removal of pollutants, the development of a short pulse generator is of paramount importance for practical applications. In this work, nanosecond pulse generator which can output the 5 ns pulsed voltage is developed. In addition, the exhaust gas treatment and the ozone production by nanosecond pulse generator were demonstrated.
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Effect of Polarity and Rise Time of Applied Pulsed Voltage on Streamer Discharge Phenomena

86%
Yoshinaga K., Okada S., Wang D., Namihira T., Katsuki S., Akiyama H.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 6
1050-1052
EN
Pulsed streamer discharges have been extensively used in many applications such as control of NO_X and SO_2 from exhaust gases, treatment of dioxins, removal of volatile organic compounds, generation of ozone and laser excitation. An operation with a high-energy efficiency is necessary for practical applications. It is very important to know the propagation mechanism of streamer discharges in order to improve the energy efficiency of pulsed discharge systems. In this paper, the emission from pulsed streamer discharges in a coaxial electrode system in air at 0.1 MPa was observed using a high-speed gated intensified charge-coupled display camera. A concentric wire-cylinder electrodes configuration was used. Positive and negative pulsed voltages having a width of about 200 ns were applied to the central electrode. From the results, the streamer discharges were initiated at the inner electrode and terminated at the outer electrode. It is suggested that the propagation velocity of the streamer discharges is being influenced strongly by the rise time and the polarity of the pulsed voltage.
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