摘要
考察了3种柴油加入低温流动改进剂前后的低温粘温特性和流变特性,利用差示扫描量热(DSC)法研究了柴油在低温下的结晶行为,运用Kissinger和Ozawa方法计算了柴油结晶过程中的表观活化能。从柴油低温下粘温曲线及流变曲线结果可知,随着温度降低,柴油由牛顿型流体向非牛顿型流体转化,由牛顿型流体向非牛顿型流体转化的温度反常点与柴油的冷滤点有一定的对应关系。通过回归流变方程发现,柴油在低温下为假塑性非牛顿型流体,并有可能向宾汉型流体转变,加入低温流动性改进剂T1804后,柴油的低温表观粘度显著降低。DSC研究表明:降温速率会影响柴油的结晶行为,加剂后柴油结晶表观活化能降低。
The properties of viscosity versus temperature and the rheological properties of diesel in low temperature (-4°C - 6°C) with cold flow improver T1804 were studied. The crystallization of diesel in low temperature was investigated by differential scanning calorimetry (DSC) and Kissinger and Ozawa methods were applied to calculate the apparent activation energy (Ea). The results show that diesel changes from Newtonian fluid to non-Newtonian fluid by cooling and the transition temperature is correlative with cold filter plugging point of diesel. After adding additives, the apparent viscosity of diesel decreases largely and the cold flow properties are improved. The DSC results indicate that the Ea of liquid-solid phase transitions of diesel in low temperature is lowered by adding additives T1804 and the cooling rate influences the diesel crystallization.
出处
《华东理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第1期43-47,共5页
Journal of East China University of Science and Technology
基金
国家科技部重大基础研究前期研究专项(2003CCA0090)
关键词
柴油
低温流动性能
粘温性质
流变特性
结晶
diesel
cold flow properties
properties of viscosity versus temperature
rheological properties
crystallization
