介质阻挡放电(DBD)诱导低温等离子体预氧化NO

Experimental study on NO pre-oxidation in non-thermal plasma induced by dielectric barrier discharge

利用介质阻挡放电产生低温等离子体预氧化C3H6/NO/N2/O2混合气中NO,分析了NO的转化机理,研究了放电功率、C3H6初始浓度和O2浓度对NO2/NO比例以及NO x转化率的影响.研究结果表明,随着放电功率升高,NO浓度先降低后升高,NO2/NO比例呈先升高后减小趋势,NO x转化率和N2O浓度持续升高;相同功率下,提高C3H6初始浓度可增加NO2/NO比例和NO x转化率;随着O2浓度增加,NO2/NO比例增加而NO x转化率降低;控制气氛中C3H6和O2的浓度可使NO2/NO比例达到1,从而提高SCR系统还原NO x的能力.

Non-thermal plasma produced by dielectric barrier discharge was used to pro-oxidize NO in C3H6/NO/N2O2 mixture and NO conversion mechanism was analyzed. The influences of discharge power, C3 H6 initial concentration and O2 concentration on NO2/NO ratio and NOx conversion efficiency were also studied. The obtained results indicate that with the discharge power increasing, NO concentration decreases firstly and then increases, and NO/NO ratio increases firstly and then decreases. NOx conversion efficiency and N20 concentration rise. With the same discharge power, NO2/NO ratio and NOx conversion efficiency grow with the increasing of C3 H6 initial concentration, NO2/NO ratio rises and NOx conversion efficiency reduces with the increasing of O2 concentration. In addition, NO2/NO ratio could reach 1 by controlling C3 H6 and O2 concentration, which is benefit to NOx conversion with SCR system.