柴油机油烟的燃烧:其可溶有机组分含量对动力学参数的影响(英文)

Diesel soot combustion: influence of the amount of soluble organic fraction on the kinetic parameters

论述了两种可溶有机组分含量(8w %,25w %)的柴油机油烟的燃烧机理。采用加热速率5℃ min～20℃ min非等温条件下的热重分析(TGA),考察了其在空气中的燃烧。应用Ozawa Flynn Wall方法,研究了析出物质的数据资料,并由复变非线性回归方法获得了各动力学参数。两种油烟的析出可根据三段机理予以模定,即:(1)可溶有机组分(SOF)的蒸发,(2)SOF热裂解,(3)炭基质燃烧。由于两种油烟所得的动力学参数非常近似,表明SOF含量对基质燃烧的影响极其有限。

The combustion mechanism of two types of diesel soot containing different amounts (8?w/% and 25?w/%) of Soluble Organic Fraction (SOF) is described. The combustion, performedin air, was studied by thermogravimetric analysis (TGA) in nonisothermal conditions with heating rates ranging from 5?℃ to 20?℃/min. The mass evolution data were studied by the OzawaFlynnWall method and the kinetic parameters were obtained from the multivariate nonlinear regression method. It is found that the evolution of both soots can be modeled by a three steps mechanism, namely: 1) SOF evaporation, 2) SOF thermal degradation and 3) combustion of the carbonaceous matrix. For both types of soot, the obtained kinetic parameters are very close, evidencing the limited influence of SOF amount on the combustion of the matrix.