空气流量对低温等离子体再生DPF的影响

Effect of air flow rate on diesel particulate filter regeneration by non-thermal plasma technology

以空气为气源,利用低温等离子体(non-thermal plasma,NTP)喷射系统,在不同的空气流量下对DPF进行了再生试验.通过测量再生过程中主要活性物质(O_3,NO_2)以及再生产物中碳氧化物(CO_x)的流量变化,分析了空气流量对DPF再生的影响.结果表明:空气经NTP发生器放电击穿后产生具有强氧化性的活性物质O_3,NO_2等,能够实现对PM的氧化分解;随着空气流量的增加,O_3质量流量及NO_2体积流量均呈升高的趋势,进入DPF的O_3,NO_2增多,促进PM的分解,CO_x中C的质量呈升高的趋势,升PM分解量呈下降的趋势;当空气流量为18.5 L·min^(-1)时,PM被氧化分解的量最多,DPF的再生效果最为显著;当空气流量为5.0 L·min^(-1)时,升PM分解量最大,空气的利用率最高.

By non-thermal plasma（ NTP） injection system,the regeneration of diesel particulate filter（ DPF） was experimented with air as gas source. The effect of air flow rate on DPF regeneration was investigated by observing the flow rates of main active substances of O_3 and NO_2 and regeneration product of CO_x during regeneration process. The results show that the active substances of O_3 and NO_2 are generated through the discharge reaction of NTP reactor and play important role in the decomposition of PM. With the increasing of air flow rate,the mass flow rate of O_3 and the volume flow rate of NO_2 are increased remarkably,which promotes the decomposition of PM. With the increasing of air flow rate,the mass of C in CO_x is increased,while the mass of decomposed PM per liter is decreased. When the air flow rate is 18. 5 L · min^（-1）,the mass of C in CO_x achieves the maximum value,and the DPF regeneration effect is the most significant. When the air flow rate is 5. 0 L · min^（-1）,the mass of decomposed PM per liter shows the maximum value,and air has the highest utilization rate.