生物柴油替代混合物化学动力学模型构建及路径分析

doi:10.3866/PKU.WHXB201312102

Abstract

Abstract:

In the present study, methyl decanoate (C₁₁H₂₂O₂) and n-heptane (nC₇H₁₆) were selected as a surrogate of biodiesel fuel. The molar ratio of the two constituents was determined to be 1:1, based on a comparison of the relative molecular weights, low heat values, and oxygen contents of the surrogate fuel and real biodiesel fuel. Furthermore, a chemical kinetic model including 691 species and 3226 elementary reactions of this biodiesel surrogate fuel was developed. The ignition delay times from experiments and calculations, under shock tube conditions, were compared; the computational results agree well with the experimental results. Comparisons of the in-cylinder pressure and main emissions under the engine conditions showed that the in-cylinder pressure calculated using this model agrees very well with the experimental result, and the trends in variations in the amounts of CO, unburned hydrocarbons, and NO_x emissions calculated using this model are also close to the experimental results. In addition, the lowtemperature reaction kinetics was analyzed in this study. The results show that the main products of methyl decanoate H- abstraction are MD2J and MDMJ. Besides the oxygen addition reaction, the main consumption paths of MD2J include reaction with C₇H₁₅O₂-3 (the product of the first oxygen addition of C₇H₁₅-1), decomposition to MP2D, and H-abstraction by O₂ forming MD2D. The main consumption paths of MDMJ are conversion to its isomers, MD2J and MD3J.

Key words: Biodiesel, Surrogate fuel, Kinetics, Ignition delay, Lowtemperature reaction

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PEI Yi-Qiang, ZHENG Zhao-Lei, ZHANG Bo. Chemical Kinetic Model Development of Biodiesel Surrogate Fuel and Reaction Path Analysis[J]. Acta Phys. -Chim. Sin. 2014, 30(2), 217-226. doi: 10.3866/PKU.WHXB201312102

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Chemical Kinetic Model Development of Biodiesel Surrogate Fuel and Reaction Path Analysis

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