摘要
为分析不同碘值生物柴油燃烧颗粒物的微观形貌和脂肪族碳氢官能团，利用高倍透射电镜和傅里叶变换红外光谱仪等仪器，研究了高压共轨柴油机燃用典型原料生物柴油燃烧颗粒物的平均粒径、计盒维数和官能团含量以及平均粒径和官能团与生物柴油碘值的关系。结果表明，大豆油生物柴油（SME）、棕榈油生物柴油（PME）和地沟油生物柴油（WME）颗粒物基本碳粒子平均粒径比柴油燃烧颗粒物分别小18.4%，20.3%和27.9%。与柴油燃烧颗粒物相比，生物柴油燃烧颗粒物的计盒维数较大，结构较紧密，团聚程度较高。SME、PME和WME燃烧颗粒物表面脂肪族C-H官能团含量分别比柴油颗粒物高6.8%，11.4%和18.2%，生物柴油颗粒物表面支链化程度均高于柴油颗粒物，柴油颗粒物中含有分子结构稳定的苯环。碘值对生物柴油燃烧颗粒物的微观形貌和官能团有着显著影响，颗粒物基本碳粒子粒径随碘值的增大而增大，脂肪族碳氢官能团含量随碘值的增大而减少。
Abstract
In order to analyze the micro morphology and aliphatic hydrocarbon functional groups of particulate matters from a high-pressure common rail diesel engine fueled with different iodine value biodiesels, the average particle size, box counting dimension, functional group content and the relationship of average particle size and functional group with iodine value were analyzed by using high power transmission electron microscope and Fourier transform infrared spectrometer. The results show that the average particle size of soybean oil biodiesel (SME), palm oil biodiesel (PME) and waste oil biodiesel (WME) combustion particulate matters is 18.4%, 20.3% and 27.9% smaller than that of diesel combustion particulate matters respectively. Compared with diesel combustion particulate matter, biodiesel combustion particulate matter has a larger box-counting dimension, a tighter structure, and a higher degree of agglomeration. The content of aliphatic C-H functional groups on the surface of SME, PME and WME combustion particulate matter is 6.8%, 11.4% and 18.2% higher than that of diesel particulate matter respectively. The degree of branched chain on the surface of biodiesel particulate matters is higher than that of diesel oil, and diesel particulate matter contains benzene ring with stable molecular structure. Iodine value has a significant effect on the micro morphology and functional groups of particulate matters. With the increase of iodine value, the particle size of biodiesel increases and the content of aliphatic hydrocarbon functional groups decreases.
关键词
生物柴油 /
颗粒 /
微观形貌 /
脂肪族 /
官能团 /
碘值
Key words
biodiesel /
particulate matter /
micro morphology /
aliphatic hydrocarbon /
functional group /
iodine value
张登攀，叶思祺，郭坤伟，蒋胜，杨启航，袁银男.
碘值对生物柴油颗粒物微观形貌及脂肪族官能团的影响[J]. 车用发动机. 2022, 0(3): 32-37 https://doi.org/10.3969/j.issn.1001-2222.2022.03.005
ZHANG Dengpan,YE Siqi,GUO Kunwei,JIANG Sheng,YANG Qihang,YUAN Yinnan.
Effect of Iodine Value on Micro Morphology and Aliphatic Hydrocarbon Functional Groups of Biodiesel Combustion Particulate Matters
[J].
Vehicle Engine. 2022, 0(3): 32-37 https://doi.org/10.3969/j.issn.1001-2222.2022.03.005
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