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High efficiency gas treatment using bi-directional pulse power system

使用双向脉冲电源系统进行高效气体处理

基本信息

批准号：
13555079
负责人：
WATANABE Masato
金额：
$ 8.83万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555079/
关键词：
Bi-directional Pulse Discharge Pulse Power Gas Treatment

项目摘要

The characteristics of high efficiency gas treatment system by bidirectional pulse corona discharge were investigated.The NOx removal efficiencies were measured using either bidirectional or unidirectional pulse discharges. The width of bidirectional pulse was 100 ns for each positive and successive negative voltage pulse. The NO and the NOx removal rates increase with applied voltage for any voltage waveform. In the case of the pulses of 200 ns for 5 Hz and the pulse of 100 ns for 10 Hz, the NO and the NOx removal rates of 88.6% and 84.5% are obtained for the unidirectional voltage of 100ns. However, these for the bidirectional pulse are the lowest. The reason, why the removal rate for the bi-directional pulse is low, is considered that the input energy for the bidirectional pulse is lower than that for the unidirectional pulse. Therefore, the removal rates as functions of input energy are investigated. As a result, the NO and the NOx removal rates increase with increasing input energy. The removal efficiency for unidirectional pulse of 100 ns is superior to that for the pulse of 200 ns. The removal efficiencies for the bidirectional voltage pulse of 200 ns and that for the unidirectional pulse of 200 ns are on the similar curve.Also, framing photographs of discharge were taken by using high-speed camera. It is thought that all pulses equally remove NOx up to 100 ns. After 100 ns, the corona discharge is occurring only near the inner electrode in the case of the bidirectional pulse and the unidirectional pulse of 200 ns. Therefore, the energy efficiency is not high. It is found that the best way is to finish the application of voltage before streamers reach the outer electrode and to prevent the generation of corona discharge limited to the vicinity of the inner electrode.

研究了双向脉冲电晕放电高效烟气处理系统的特性，并分别测定了双向和单向脉冲放电对NOx的去除率。对于每个正电压脉冲和连续的负电压脉冲，双向脉冲的宽度为100 ns。对于任何电压波形，NO和NOx去除率都随着所施加的电压而增加。在5Hz、200ns脉冲和10Hz、100ns脉冲的情况下，单向电压为100ns时，NO和NOx的去除率分别为88.6%和84.5%。然而，双向脉冲的这些是最低的。双向脉冲的去除率低的原因被认为是双向脉冲的输入能量低于单向脉冲的输入能量。因此，作为输入能量的函数的去除率进行了研究。结果，NO和NOx去除率随着输入能量的增加而增加。100 ns单向脉冲的去除效率比200 ns脉冲的去除效率高上级。200 ns的双向电压脉冲和200 ns的单向电压脉冲的去除效率在相似的曲线上。据认为，所有脉冲在高达100 ns的时间内同等地去除NOx。在100 ns之后，在200 ns的双向脉冲和单向脉冲的情况下，电晕放电仅发生在内电极附近。因此，能源效率不高。结果表明，最好的方法是在流光到达外电极之前完成电压的施加，防止电晕放电发生在内电极附近。