摘要
应用EEPS粒径谱仪、高分辨率透射电子显微镜、同步热分析仪等仪器分析了3种不同碘值生物柴油(大豆生物柴油、棕榈生物柴油和餐废油脂生物柴油)在高压共轨柴油机燃烧产生颗粒物的微观结构和氧化特性。结果表明:相较于柴油燃烧颗粒物,生物柴油燃烧颗粒物粒径偏小、聚集程度更高、基本碳粒子微晶碳层越发无序,起燃温度Ti、燃尽温度Te和氧化速率峰值温度Tp更低。大豆生物柴油、棕榈生物柴油和餐废油脂生物柴油燃烧颗粒物的盒维数比柴油颗粒分别变大0.8%、0.9%、1.1%;平均粒径分别降低5.1%、6.7%、13.9%;表观活化能分别降低12.4%、13.4%和16.9%,氧化反应所需能量降低。随着生物柴油碘值的降低,生物柴油燃烧颗粒物的数量浓度减小,盒维数增大,颗粒物内部碳层更短小、更弯曲,氧化活性升高。
The micro-structure and oxidation characteristics of combustion particulates in high pressure common rail diesel engine are analyzed for three types of biodiesel with different iodine values,respectively soybean oil methyl ester(SME),palm oil methyl ester(PME)and waste cooking oil methyl ester(WME),by using the EEPS particle size spectrometer,high-resolution transmission electron microscope and synchronous thermal analyzer.The results show that compared with diesel combustion particulate matter(PM),biodiesel PM has smaller particle size,higher aggregation degree and more disordered microcrystalline carbon layer,and lower initiation temperature(Ti),burnout temperature(Te)and peak temperature of maximum weight loss rate(Tp).The box dimensions of PM of SME,PME and WME are 0.8%,0.9%and 1.1%larger than that of diesel PM.Besides,compared with diesel PM,the average particle size decreases by 5.1%,6.7%,13.9%and the apparent activation energy decreases by 12.4%、13.4%and 16.9%respectively and the energy required for oxidation reaction decreases.With the decrease of iodine value of biodiesel,the quantity concentration of biodiesel combustion PM decreases,the box dimension increases,the internal carbon layer of PM becomes shorter and curved,and the oxidation activity increases.
作者
贾长凯
张登攀
赵根锐
苏力
梅德清
袁银男
Jia Changkai;Zhang Dengpan;Zhao Genrui;Su Li;Mei Deqing;Yuan Yinnan(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013;College of Energy,Soochow University,Suzhou 215006)
出处
《汽车工程》
EI
CSCD
北大核心
2022年第1期44-51,共8页
Automotive Engineering
基金
国家自然科学基金(51876133)资助。
关键词
生物柴油
碘值
颗粒物
微晶结构
氧化特性
biodiesel
iodine value
particulate matter
micro-structures
oxidation characteristics
