Study on the correlation between mechanical and oxidation characteristics of methanol/biodiesel particulate matter
2020
Lichuanjushi, | Zhang, Libin | Wang, Zhong | Li, You | Sun, Yong
In order to effectively reduce the number of diesel exhaust particles and reduce particulate emissions, it is necessary to have a deep understanding of the mechanical and oxidation characteristics of diesel exhaust particles. For the combustion particles of methanol/biodiesel (BM5, BM10, and BM15), atomic force microscopy and thermogravimetric analyzers were used to study changes of particle in mechanical parameters and oxidation rules, and association impact analysis was performed. Biodiesel (B100) was used as a reference. The results showed that with the increase of methanol content, the attraction force Fₐₜ, the cohesive force Fₐd, the adhesion energy Wₐd, and Young’s modulus E of the methanol/biodiesel particles all decreased significantly. During the oxidation process, the weight loss rate of SOF increased, while the content of soot decreased. In addition, the initial combustion temperature of the SOF component TSOF and soot component Tₛₒₒₜ in particles as well as the burn-out temperature Tₑₙd showed a downward trend. There was a certain correlation between the mechanical parameters and the oxidation properties of the particles. The smaller the mechanical parameters, such as the attraction force Fₐₜ, viscous force Fₐd, the cohesive force Fₐd, the adhesion energy Wₐd, and Young’s modulus E, the greater the looseness of the particles, the smaller the particle hardness and the degree of graphitization.
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