Regeneration of accumulated soot particles in the substrate walls of the diesel particulate filtration system is one of the major challenges faced by the automotive industry. This study investigated the conversion efficiency and filtration behaviour of the after treatment system comprising of diesel oxidation catalysis (DOC) and diesel particulate filtration (DPF) system. The average conversion efficiency of hydrocarbons was close to 54% and filtration efficiency of the particle number emissions was around 92%. Characterization of the DOC and DPF substrate were conducted using microscopic imaging, Fourier transform infrared spectroscopy (FTIR) and particle size analysis (PSA). The results of FTIR study indicated the presence of carcinogenic agents trapped in the porous walls of the filter substrate. A model for microwave based regeneration system is proposed in this article and CFD analysis were conducted to determine the temperature and electric field distribution in the DPF substrate for a regeneration time of 180 s. Results of simulation showed that the microwave radiations raise the temperature close to soot oxidation temperature (873 K), ensuring effective regeneration.

柴油机微粒过滤系统的底壁中积累的烟灰微粒的再生是汽车工业面临的主要挑战之一。本研究调查了由柴油氧化催化（DOC）和柴油微粒过滤（DPF）系统组成的后处理系统的转化效率和过滤性能。碳氢化合物的平均转化效率接近54％，颗粒物排放物的过滤效率约为92％。使用显微镜成像，傅里叶变换红外光谱（FTIR）和粒度分析（PSA）对DOC和DPF基材进行表征。FTIR研究的结果表明，致癌剂被捕集在过滤器基质的多孔壁中。本文提出了一种基于微波的再生系统模型，并进行了CFD分析，以确定再生时间为180 s的DPF基板中的温度和电场分布。模拟结果表明，微波辐射使温度升高至接近烟灰氧化温度（873 K），从而确保有效再生。