碘值对生物柴油颗粒物微观形貌及脂肪族官能团的影响

In order to analyze the microscopic morphology and aliphatic hydrocarbon functional groups of biodiesel combustion particulates with different iodine values, instruments such as a high-resolution transmission electron microscope and a Fourier transform infrared spectrometer were used to study the average particle size, box-counting dimension, functional group content of biodiesel combustion particulates from a high-pressure common-rail diesel engine using typical raw material biodiesels, as well as the relationships between the average particle size and functional groups and the iodine value of biodiesel. The results show that the average particle sizes of the basic carbon particles of soybean oil biodiesel (SME), palm oil biodiesel (PME), and waste oil biodiesel (WME) particulates are 18.4%, 20.3%, and 27.9% smaller than those of diesel combustion particulates, respectively. Compared with diesel combustion particulates, the box-counting dimension of biodiesel combustion particulates is larger, the structure is more compact, and the agglomeration degree is higher. The contents of aliphatic C - H functional groups on the surfaces of SME, PME, and WME combustion particulates are 6.8%, 11.4%, and 18.2% higher than those of diesel particulates, respectively. The degree of branching on the surfaces of biodiesel particulates is higher than that of diesel particulates, and diesel particulates contain benzene rings with a stable molecular structure. The iodine value has a significant impact on the microscopic morphology and functional groups of biodiesel combustion particulates. The particle size of the basic carbon particles increases with the increase of the iodine value, and the content of aliphatic hydrocarbon functional groups decreases with the increase of the iodine value.

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。