空气介质阻挡放电型间接低温等离子体系统性能实验分析

Experimental Analysis on the Characteristics of an Air-fed Indirect Non-thermal Plasma System Using Dielectric Barrier Discharge

利用自行设计的同轴圆柱介质阻挡放电(DBD)型低温等离子体(NTP)反应器,对用于分解柴油机排放污染物的间接NTP(INTP)系统性能进行实验研究,分析了供电电压峰峰值、供电频率、供气体积流量和放电区域温度等参数对产生的O3、NO2、NO等活性物质体积分数的影响。结果表明:O3、NO2体积分数随供电频率先增加后减小,电压峰峰值过高不利于O3、NO2的生成;放电区域的温升将加速O3的热分解效应,故需控制放电区域温度;加大供气体积流量将降低INTP产物体积分数,但单位时间内产物体积将增加。研究结果对开发用于分解柴油机排放污染物的空气DBD型INTP系统,优化它与不同后处理装置的匹配有重要指导意义。

The characteristics of an indirect non-thermal plasma（INTP）system used to decompose harmful exhaust emission from diesel engine were experimentally studied by using a self-designed DBD type NTP reactor coaxial-cylinder structure.The effects of peak-to-peak value（Up-p）and frequency of voltage-supplied,flow rate of air,and the temperature of discharge zone on the concentration of active materials such as O3,NO2and NO were investigated.The experimental results indicate that,over-high Up-pwould decrease the concentrations of O3and NO2,which have strong oxidizing property;with the increasing of the frequency of voltage-supplied,the concentrations of O3and NO2increase at first and then decrease;the temperature rising at discharge zone will promote the thermal decomposition of O3and thus increase its concentration and that of NO2;raising air flow rate will decrease the concentration of INTP products but increase their amount in unit time.These results are of great significance for development of DBD type INTP system and optimization of its matching with other after-treatment devices.