中空纤维膜萃取器内流动特性  

Hydrodynamics of hollow fiber membrane extraction modules

作　　者：王玉军[1] 骆广生[1] 王岩[1] 戴猷元[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2001年第12期56-58,共3页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目 (2 983 613 0 )

摘　　要：对中空纤维膜器内流动特性的研究是膜器设计和放大的基础。该文通过测量装填因子不同的 3个聚丙烯中空纤维膜萃取器壳程和管程的停留时间分布曲线 ,研究了不同流速下膜器的流动状况 ,并用轴向扩散模型描述了流动的非理想性。结果表明 ,中空纤维膜萃取器的管程和壳程流动与理想平推流和理想全混流相差较大 ,装填因子与流速对二者均有较大影响。采用轴向扩散模型得到的响应曲线的计算值与实验值符合较好 ,且中空纤维膜萃取器中轴向返混的影响不可忽略。Understanding of the flow characteristics in a hollow fiber module is very significant for the scale up and design of membrane modules. This work investigates the flow in hollow filber modules at different flow velocities. The residence time distribution (RTD) curves were measured for three polypropylene hollow fiber modules with various packing factors. An axial diffusion model was used to describe the non ideal flow in the membrane modules. The results show that the actual flow differs from ideal plug flow and continuous stirred flow. The flow velocity and the packing factor greatly influence the flow in both the tube and shell sides. The curves calculated from the axial diffusion model agree well with the actual RTD curves so the axial diffusion in hollow fiber modules should not be ignored.

关 键 词：中空纤维膜萃取器 膜萃取 轴向扩散模型 流动特征 装填因子 流速 停留时间 

分 类 号：TQ051.83[化学工程] TQ028.8