再生温度和来流参数对柴油机颗粒过滤器再生和过滤特性影响的试验研究

基于外加热源再生性能测试台架,研究了不同再生温度和不同来流流量对柴油机颗粒过滤器(diesel particulate filter,DPF)出口颗粒排放的影响。试验结果表明:加载量为2.5g/L时,DPF出口颗粒物出现一个颗粒数浓度波峰;加载量为5.0g/L时,DPF出口颗粒物出现两个数量浓度波峰。相同来流流量下,再生效率和总质量浓度随着再生温度的增加而增加;升温阶段出口颗粒物以核模态为主;再生阶段时,内部出现温度波峰且出口颗粒物以50nm以上聚集态颗粒为主。相同再生温度下,加载量为2.5g/L时再生效率和总质量浓度随着来流流量的增加而增加,升温和再生阶段出口颗粒物均以核模态为主;加载量为5.0g/L时再生效率和总质量浓度随来流流量的增加呈现先增加后减少的趋势,升温阶段出口颗粒物以核模态为主,再生阶段在大流量时有部分聚集态颗粒物排出。

Experimental Study on the Effect of Regeneration Temperature and Input Exhaust Parameters on the Regeneration and Filtration Characteristics of a Diesel Particulate Filter

Based on the regeneration performance testing bench,based on the regeneration performance test bench, The effects of regeneration temperature and flow rate on particulate emission from diesel particulate filter (DPF) outlet were studied. The results show that:When the loading was 2.5g/L, there was a quantitative concentration peak at the DPF outlet, and when the loading was 5g/L, there were two quantitative concentration peaks at the DPF outlet. At the same flow rate, the DPF regeneration efficiency and total mass concentration increased with the increased of regeneration temperature, and the outlet particle dinameter was dominated nuclear mode. besides, during the regeneration phase, temperature peaks appear inside the DPF and the outlet particles are mainly accumulate mode. At the same regeneration temperature, the regeneration efficiency and total mass concentration increase with the increase of flow rate at 2.5g/L, and the nuclear mode dominates the outlet particulate matter at the heating and regeneration stage. When the loading is 5g/L, the regeneration efficiency and total mass concentration increased first and then decreased with the increase of flow rate at the heating stage. Outlet particulate matter was mainly in nuclear mode, and some aggregated particulate matter is discharged in the regeneration stage at high flow rate.