多层介质阻挡放电处理柴油机尾气颗粒物

Treatment of particle material from diesel exhaust using multilayer dielectric barrier discharge

研究柴油机尾气中颗粒物(PM)的排放特性,探讨多层介质阻挡放电(DBD)反应器中的反应单元及放电功率对PM的去除影响.研究发现,随着柴油机输出功率的增加,排气温度和尾气中PM粒子数密度都上升;随着反应单元的增加,柴油机尾气在DBD反应器中的停留时间增加,PM去除率呈增加趋势.当反应单元数为40时,PM去除率为88%;随着放电功率的增加,PM去除率增加,最大可达93%;粒径200nm以下的PM比粒径大于200nm的PM更加容易去除.

Particle material（PM）emission from a diesel engine was characterized.Effects of dielectric barrier discharge（DBD）reaction channels in a multilayer DBD reactor and discharge power on PM removal were investigated.Results showed that the temperature of exhaust gases and PM total number density increased with the increase of engine output power.PM removal improved with the increasing reaction channels due to the increase in residence time of exhaust gases in the multilayer DBD reactor.When the number of reaction channel was 40,PM removal efficiency was as high as 88%.PM removal increased up to 93%as maximum with increasing discharge power.PM with particle sizes smaller than 200 nm was removed more easily than those bigger than 200 nm.