基于减压膜蒸馏除湿溶液再生过程实验研究  

Experimental Study on Vacuum Membrane Distillation Liquid Regeneration of Liquid Desiccant Air Conditioning System

作　　者：周君明 张小松[1] ZHOU Jun-Ming;ZHANG Xiao-Song(School of Energy and Environment,Southeast University,Nanjing 1210096,China)

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《工程热物理学报》2020年第11期2635-2640,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51520105009)。

摘　　要：用LiCl溶液作为除湿溶液进行减压膜蒸馏(VMD)溶液再生实验。研究了溶液温度、浓度,纤维膜的长度、数量对膜通量、传质系数、截留率和再生能力的影响。结果表明,溶液的温度对VMD的再生性能有很大影响,再生能力从0.1%升高到0.8%~1.2%,水通量、传质系数也随再生温度的升高而增大。在相同的再生能力下,30%LiCl溶液的再生温度比20%LiCl溶液高约7℃。为了提高高浓度溶液的再生效果,可以适当提高再生温度。此外,溶液的水通量和再生能力随着膜数的增加先降低再增加。因此,合理选择数量的纤维膜可以不仅节省材料,还可以提高再生能力。LiCl solution was used as the liquid desiccant for the vacuum membrane distillation(VMD)regeneration process of liquid desiccant air conditioning system.The effects of liquid temperature,concentration,length and number of membrane on water flux,mass transfer coefficient,interception and regeneration were studied.The results show that the temperature of the liquid has large influence on the regeneration performance of VMD,the regeneration capacity increases from 0.1%to 0.8%~1.2%,and the water flux and mass transfer coefficient also increase with the regeneration temperature.Under the same regeneration capacity,the regeneration temperature of 30% LiCl solution is about 7℃ higher than that of 20% LiCl solution.In order to improve the regeneration effect of high concentration solution,the regeneration temperature can be increased appropriately.In addition,the water flux and regeneration capacity of the solution first decreased and then increased with the increase of the number of membranes.Therefore,the reasonable selection of the number of fiber membrane can significantly save material,but also can improve the regeneration capacity.

关 键 词：溶液除湿 减压膜蒸馏 再生性能 膜通量 

分 类 号：TK123[动力工程及工程热物理—工程热物理]