乙醇柴油发动机的颗粒排放及其热解动力学分析

利用热重分析仪对柴油机燃用0#柴油和乙醇柴油排放的颗粒进行热重及其动力学分析。研究表明，柴油中添加乙醇有助于降低柴油机的颗粒排放。通过颗粒的热重分析得出，颗粒氧化过程主要发生水分挥发、可溶性物质氧化和固体碳氧化3个过程，其中，固体碳约占颗粒总量的70%，可溶性有机物约占颗粒总量的25%。通过Coats-Redfern法对颗粒热重数据进行动力学计算分析，得出柴油机燃用0#柴油的颗粒的活化能为130.3 kJ/mol，燃用乙醇柴油的颗粒的热解活化能为122.9 kJ/mol，两拟合曲线的线性回归系数均大于0.99。为开发高效的颗粒催化剂及柴油机颗粒捕集器选择适当的可再生技术提供理论依据。

Particulate matter emission and its pyrolysis kinetic analysis of ethanol-diesel engine

The thermo gravimetric and kinetic characteristics of particulate matter (PM) of diesel engine fueled with 0# diesel and ethanol diesel were studied by using thermo gravimetric analysis (TGA). Results show that adding ethanol to diesel fuel can help reduce the PM emission of diesel engine. The carbon oxidation mainly included three stages, water evaporation, oxidation of soluble substances and solid carbon oxidation. The contents of solid carbon and soluble substances were about 70% and 25% of total PM. The activation energy of PM of diesel engine fueled with 0# diesel was 130.3 kJ/mol, and that of ethanol diesel was 122.9 kJ/mol through the kinetic analysis by Coats-Redfern method. The linear regression coefficient of two fitted curves was over 0.99. The research can provide a theoretical basis for the development of efficient particulate matter catalysts and appropriate selection of renewable technologies of diesel particulate filter.