低温等离子体降低柴油机颗粒物排放的试验

Experimental Study on Non-thermal Plasma Aftertreatment of Particulates Matter in Diesel Engine Exhaust

采用基于介质阻挡放电原理的低温等离子体试验装置及反应器,进行了低温等离子体处理柴油机排气中颗粒物的模拟和台架试验。结果表明,通过介质阻挡放电产生等离子体可有效分解柴油机排气中的颗粒物,并且相关的化学反应主要集中在介质阻挡放电微放电通道之中,颗粒物的分解率随能量密度的增加而增加。同时,介质阻挡放电所生成的低温等离子体使排气中的NO转化为NO2,但不能减少排气中NOx的总量。在同等能量密度下,排气中颗粒物含量的增加使低温等离子体转化排气中HC、NO的效率下降。

Using non-thermal plasma devices and reactor based on dielectric barrier discharge principles, simulation experiment and bench test were carried out. Experimental result indicated that non-thermal plasma produced by dielectric barrier discharge could decompose particulate matter in diesel exhaust effectively, and correlative chemical reaction mainly took place in the channels of micro discharge, decomposition rate of particulate matter increased with the energy density. The non-thermal plasma reactor could transform NO in the exhaust to NO2, but could not reduce the total amount of nitric oxides. Decomposition and conversion rate of HC and NO in diesel exhaust when treated with nonthermal plasma descend along with the quantity of particulate matter in the exhaust.