LARGE VOLUME STREAMER DISCHARGES PRODUCED BY PULSED POWER

脉冲功率技术以短脉冲宽度处理超大功率。重复频率脉冲功率发生器的发展增加了脉冲功率工业应用的可能性。应用领域包括燃煤电厂和汽车尾气处理、二恶英和氟利昂的处理、挥发性有机化合物的处理和紫外线光源。虽然这些应用使用的是大气中大体积的流光放电，但对大气中大体积流光放电现象的研究还不够深入，本文主要研究大气大体积流光放电。然后，研究了流光放电等离子体与废气治理的关系。流光到达外电极后，产生电导率较高的等离子体。流光放电等离子体对NOx的处理效果很大。电导率较高的等离子体对NOx的脱除效果较小。因此，选择合适脉冲宽度的脉冲功率是获得高效脱除NOx的关键。将这些技术应用于实际燃煤电厂，脱氮率达到90%。用光谱学和激光诱导荧光法测定了电子能量、NO、OH自由基随时间的变化。并将实验结果与计算机模拟结果进行了比较。

Pulsed power technology treats extremely large power with a short pulse width. The development of repetitive pulsed power generators increases the possibility of industrial applications of pulsed power. The fields of applications are exhaust gas treatments from coal power plants and mobile cars, treatments of dioxin and flon, treatment of VOC and light source of ultraviolet. Though these applications use the streamer discharges with a large volume in atmosphere, the phenomena of streamer discharges have not been investigated in detail.The main purpose of this research is to investigate the streamer discharges with the large volume in atmosphere. Then, the relationship between streamer discharge plasmas and the treatment of exhaust gases is investigated. After the streamer arrives at the outer electrode, the plasma with relatively high conductivity is produced. The streamer discharge plasma has a large effect to treat the NOx. The plasma with relatively high conductivity has a small effect for NOx removal. Therefore, the pulse power with a proper pulse width is important to get a high efficiency of NOx removal. These techniques were applied to the real coal power plant, and 90% of NO removal was attained. Electron energy, temporal change of NO, OH radical were also measured by spectroscopy and laser induced fluorescence. The comparison between experimental results and computer simulation was done too.