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为了提高低温等离子体对柴油机有害排放物的净化效率,提出了大气隙同轴圆柱结构低温等离子体反应器的设计思想;在电场分析与起始放电电压分析计算的基础上,设计了一种用于柴油机排气后处理的线管式低温等离子体反应器;对反应器的放电形貌、工作电压、介质等效电容等参量进行了试验研究及理论分析。结果表明,线管式低温等离子体反应器存在介质阻挡电晕放电和介质阻挡丝状放电两种不同的放电形式,二者的放电形貌与工作特性显著不同,介质阻挡丝状放电时放电区域更大,更有利于污染物处理;放电形式由介质阻挡电晕放电转变为介质阻挡丝状放电时,反应器工作电压会瞬时降低;电源工作频率对反应器工作性能影响显著,为了更有利于实现介质阻挡丝状放电,电源工作频率应该调至回路的谐振频率附近。
In order to improve the decontamination efficiency of low-temperature plasma on harmful emissions of diesel engine, a design idea of low-temperature plasma reactor with large air gap coaxial cylindrical structure was proposed. Based on the analysis of electric field and initial discharge voltage, Pipeline low-temperature plasma reactor after exhaust gas treatment of diesel engine was used. The discharge morphology, working voltage and equivalent capacitance of the reactor were studied experimentally and theoretically. The results show that there are two kinds of discharge modes, dielectric barrier corona discharge and dielectric barrier filament discharge, in the tubular low temperature plasma reactor. The discharge morphology and working characteristics of the two reactors are significantly different. The discharge area Larger and more conducive to pollutant treatment; discharge form from dielectric barrier corona discharge into a dielectric barrier filament discharge, the reactor voltage will be instantaneous decrease; power supply frequency of the reactor performance significantly, in order to be more conducive to Dielectric discharge to achieve a filamentous discharge, power supply operating frequency should be adjusted to the loop near the resonant frequency.