DPF分区再生性能的试验研究

Experimental Study on DPF Partial Regeneration

基于外加热源再生性能测试台架,探索了柴油机颗粒捕集器(DPF)分区再生对再生性能的影响及其传热规律。试验结果表明:单区沉积再生时,Ⅰ区沉积和Ⅱ区沉积时容易出现较高的最高温度和最大温度梯度,同时再生效率也较高;沉积区域越偏离轴心,其再生效率越低。双区沉积再生时,沉积区域间距越小且越靠近轴心则越利于再生,再生效率也越高。多区沉积再生时,相比其他沉积情况,当Ⅱ区不沉积颗粒时,最高温度和最大温度梯度较低,同时具有较高的再生效率。DPF内部热量主要聚集在轴心末端位置,当DPF末端发生剧烈再生时热量具有向前传递的趋势。

Based on a diesel particulate filter（DPF） regeneration testing bench with additional heating sources, the influence of a partial deposited DPF on its regeneration performance and heat transfer characteristics were experimentally investigated. The results show that with single region deposition, the maximum temperature and maximum temperature gradient present with high values when carbon black deposits Region Ⅰ in the axial center of the DPF or in Region Ⅱ next to Region Ⅰ, leading to high regeneration efficiency. The regeneration efficiency decreases when a deposited region moves from the center to the edge of the DPF. When carbon black deposits in two regions, the DPF would be easily oxidized, and the regeneration efficiency would go higher if the distance of the two regions is smaller and the two regions are closer to the center of the DPF. With multi-region deposition, when carbon black deposits in other regions than Region Ⅱ, the maximum temperature and the maximum temperature gradient would be relatively lower, but the regeneration efficiency would not be reduced greatly. The regeneration heat is mainly concentrated in the rear center point of the DPF. If the heat is greatly concentrated at the rear center of the DPF, the heat would transfer reversely from the rear to the front.