能量回收式膜蒸馏组件的设计和性能  

Design of membrane distillation module with energy recovery and its performance for desalination

作　　者：耿洪鑫[1,2] 徐义明 李凭力[1,2] 黄益平 吴浩赟[1,2] 陈英才 陆晓咏 

机构地区：[1]天津大学化工学院,天津300072 [2]天津市膜科学与海水淡化技术重点实验室,天津300072 [3]中建安装工程有限公司,南京210046

出　　处：《膜科学与技术》2014年第2期85-89,共5页Membrane Science and Technology

摘　　要：针对膜蒸馏过程热效率低、耗能高的问题,设计了新型能量回收式膜蒸馏组件,其特点是膜蒸馏组件由中空纤维膜、换热管和隔网组成,通过换热管回收膜蒸馏过程的能量,通过隔网将中空纤维膜和换热管隔开,减少了膜蒸馏过程中热传导传递的热量,采用新型能量回收式膜蒸馏组件对质量分数3.0%的氯化钠溶液进行浓缩实验,考察膜管比例、组件长度以及空气隙宽度对膜蒸馏过程膜通量、造水比和热效率影响.实验结果表明,在原料液进料温度T1为40.0℃,T3为90.0℃,流量为10.0L/h,气隙间隙为0.5mm,换热管根数Nd/中空纤维膜根数Nm为2∶1时,膜通量为3.1kg/(m2·h),造水比为4.3,热效率为85%.In view of the lower thermal efficiency and high energy consumption of membrane distillation process, a new membrane module with energy recovery was designed. The module consisted of hollow fiber membranes,heat exchange tubes and plastic net. In the module energy was recycled by the heat exchange tubes,and the hollow fiber membrane and heat exchange tubes were divided by the plastic net in order to reduce heat conduction loss in membrane distillation process. The concentration of an aqueous solution containing 3. 0% sodium chloride was experimentally investigated by using the membrane modul. The effects of the ratio of the hollow fiber membrane and heat exchange tubes, the air-gap thickness and the length of the membrane module on the water permeat flux, water gained-output-ratio（GOR） and thermal efficient were studied. The results showed that when the feed temperature TlWaS 40.0 ℃ , Ta was 90.0 ℃ ,the feed flow flux was 10.0 L/h,the Na/Nmwas 2 ： 1,the length of membrane module was 0. 85 m,and the air-gap thickness was 0. 5 mm, the water permeat flux was up to 3.1 L/（m2 · h） ,GOR was 4. 3 and the thermal efficient was up to 85 %.

关 键 词：能量回收 膜蒸馏 盐水浓缩 

分 类 号：TQ028.8[化学工程]