重油胶体结构及温度效应与剪切效应的模拟  

EFFECT OF TEMPERATURE AND SHEARING RATE ON COLLOIDAL STRUCTURES OF HEAVY OIL BY MESOSCALE SIMULATION

作　　者：任强[1] 代振宇[1] 周涵[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油炼制与化工》2013年第4期39-44,共6页Petroleum Processing and Petrochemicals

基　　金：国家重点基础研究发展计划"973"项目(2006CB202505)资助

摘　　要：为了研究重油的胶体结构及温度和流动状态等外部条件变化对胶体结构的影响,选用了十种模型化合物代表重油的组成,用耗散粒子动力学对重油胶体在不同温度、不同剪切速率下的变化情况进行了模拟。结果发现:重油体系以胶体的形式存在,胶粒是由一些从内到外极性逐渐变小的组分组成,在胶体体系中饱和分和单环芳烃为分散介质;重油体系的活化状态受温度的影响较大,并存在一个最佳活化温度;随着剪切速率的增加,重油体系的剪切黏度降低,表现出假塑性流体的特性。Heavy oil is an extremely complex colloidal system. In order to research the colloidal structure of heavy oil and its structure variation by change of external conditions such as temperature and shearing rate. Ten kinds of model compounds were selected to represent the composition of heavy oil. Dissipative particle dynamics （DPD） was applied to simulate the changes of colloidal structure of heavy oil at different temperature and different shearing rate. The simulation results show that heavy oil possesses a colloidal structure made of components and that the polarity of the colloidal structure be- comes gradually weaken from inside to outside. The dispersed phase is colloidal particle and the continu- ous phase is saturates and mononuclear aromatic. The heavy oil colloidal activation is greatly influenced by temperature. At certain temperature the heavy oil colloidal will has a most suitable activation status. Shear viscosity of heavy oil reduces with the increase of the shearing rate. Heavy oil exhibits the characteristics of pseudoplastic fluid.

关 键 词：重油 胶体结构 耗散粒子动力学 活化温度 剪切速率 

分 类 号：TE621[石油与天然气工程—油气加工工程]