Effects of the lubricating oil and diesel mixture combustion on the oxidation and microphysical properties of particulate matter

This research focuses on the diesel and diesel/oil mixed fuel combustion particles as the research object and analyzes the characteristics of the two kinds of fuel oil under different parameters. The characteristics of the combustion particulate matter in the DPF discharge of the two fuels before and after carrying out TEM imaging of the sample particles were studied. The TEM image was obtained, and the morphology characteristics, level spacing, crystallite size, and curvature were discussed. The microstructure characteristics of the particulate samples were determined with Raman spectroscopy to analyze the degree of graphitization of the particulate matter. The results show that, during combustion, the lubricating oil is easily cracked to produce insoluble particles, sulfate and ash. The insoluble particles tend to saturate and condense into nuclei during the exhaust and dilution processes, which leads to an increase in the modal accumulation particles. The combustion of the lubricating oil has a great influence on the working efficiency of the DPF posttreatment system.