减压膜蒸馏传热传质过程  

Heat and mass transfer in vacuum membrane distillation

作　　者：刘捷[1] 武春瑞[1] 吕晓龙[1] 

机构地区：[1]天津工业大学生物化工研究所,中空纤维膜材料与膜过程国家重点实验室培育基地,天津300160

出　　处：《化工学报》2011年第4期908-915,共8页CIESC Journal

基　　金：国家高技术研究发展计划项目(2008AA06Z303);高等学校博士学科点专项科研基金项目(20091208110003);天津市重点基金项目(09JCZDJC26300);天津市高校科技发展基金计划项目(20080507)~~

摘　　要：对减压膜蒸馏传热传质机理进行了研究,在已有理论模型的基础上,考虑温度极化和浓差极化的影响,引入减压膜蒸馏传热传质理论模型,并对模型进行了计算,结果表明:随温度的升高,传质系数Km升高,温度极化系数TPC减小,浓差极化系数CPC增大,通量呈近指数倍增加;随流速的增加,TPC增大,膜表面传热系数hf增大,CPC略有降低,Km略有升高,通量略有升高;随中空纤维填充数目的增大,通量减小;随真空度的增大,TPC减小,CPC增大,通量呈线性增长;模型计算值与实验值符合较好。Heat and mass transfer processes in a vacuum membrane distillation（VMD）were studied.A theoretical model that considers the temperature polarization and concentration polarization was used in the calculation of VMD process.It was found that as temperature increased,the mass transfer coefficient Km increased,the temperature polarization coefficient（TPC）decreased,the concentration polarization coefficient（CPC）increased,and the flux increased nearly exponentially.As the feed velocity increased,TPC and heat transfer coefficient hf increased,CPC decreased slowly,Km and the flux increased slowly.The flux decreased with the increase of number of fiber.As the vacuum increased,the TPC decreased,CPC and flux increased.The calculated results were in good agreement with the experimental data.

关 键 词：减压膜蒸馏 传热传质 通量 

分 类 号：TQ028.8[化学工程]