减压膜蒸馏海水淡化实验研究  

Experimental study on vacuum membrane distillation for seawater desalination

作　　者：曾辉[1,2] 王永青[3,2] 

机构地区：[1]集美大学轮机工程学院,福建厦门361021 [2]福建省清洁燃烧与能源高效利用工程技术研究中心,福建厦门361021 [3]集美大学机械工程学院,福建厦门361021

出　　处：《化学工程》2013年第5期19-23,共5页Chemical Engineering(China)

基　　金：福建省教育厅资助科技项目(JA10193);集美大学创新团队基金资助项目(2009A002)

摘　　要：利用减压膜蒸馏海水淡化实验台,以NaCl盐水代替海水进行了脱盐实验,研究了进料液温度、流量、质量分数和冷侧真空度对膜通量、截留率、淡水电导率、单位淡水能耗和回收率的影响。结果表明:膜组件入口进料液温度和冷侧真空度是影响系统性能的主要因素,进料液流量和质量分数的影响较小。聚丙烯膜(PP)表现出了良好的分离性能,产品淡水的电导率均小于30μs/cm,截留率大于99%。文中还讨论了淡水能耗高的原因和改进的途径。Using the experimental set-up of vacuum membrane distillation desalination system, and taking NaCl aqueous solution as feed, experiments were performed to investigate the influence of the feed temperature, feed flowrate, feed mass fraction and cold-side vacuum pressure on membrane flux, retention rate, electrical conductivity of fresh water produced, unit energy consumption and recovery rate. The results show that the feed temperature at membrane module inlet and the cold-side vacuum pressure are the main factors influencing the system performance, and the effects of the feed flowrate and the feed mass fraction are minor. The polypropylene （PP） membrane displays excellent separating performance, with the electrical conductivity of fresh water less than 30 μs/cm and retention rate higher than 99%. The reason for the high energy consumption of fresh water and the ways for performance improvement were also discussed.

关 键 词：减压膜蒸馏 膜通量 截留率 能耗 回收率 

分 类 号：X791[环境科学与工程—环境工程]