Experimental Investigation of Modified Polypropylene Shell-Tube Column Using Humidification-Dehumidification Desalination Process  

作　　者：成怀刚 王世昌 

机构地区：[1]Chemical Engineering Research Center, State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Technology, Tianjin University

出　　处：《Transactions of Tianjin University》2007年第3期181-185,共5页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China;China Energy Conservation Investment Corporation as a key project(No.20236030) .

摘　　要：The polypropylene tubes with surface modification were installed in a baffled shell-tube column to conduct the thermally coupled humidification and dehumidification desalination process. The effects of several operating parameters （feed water temperature, water flow rate, carrier air flow rate, and external steam flow rate） on the productivity and thermal efficiency of this column were investigated experimentally. The results show that the feed water temperature has a positive effect on the productivity and thermal efficiency, while the flow rates of external steam, feed water, and carrier air should be optimized within the ranges of 0.006-0.020 kg·m^-2·s^-1 , 0.005-0.015 kg·m^-2·s^-1, and 0.7-1.3kg·m^-2·s^-1, respectively; the flow rates of feed water and carrier air are greatly controlled by the wetting state of the tubes. In comparison with the previous desalination column installing the coppery tubes, the present column can reach nearly the same production capacity of distilled water, which demonstrates the feasibility of applying such a plastic column to the humidification and dehumidification desalination process.The polypropylene tubes with surface modification were installed in a baffled shell-tube column to conduct the thermally coupled humidification and dehumidification desalination process. The effects of several operating parameters (feed water temperature, water flow rate, carrier air flow rate, and external steam flow rate) on the productivity and thermal efficiency of this column were investigated experimentally. The results show that the feed water temperature has a positive effect on the productivity and thermal efficiency, while the flow rates of external steam, feed water,and carrier air should be optimized within the ranges of 0.006—0.020 kg·m-2·s-1, 0.005—0.015 kg·m-1·s-1, and 0.7—1.3 kg·m-2·s-1, respectively; the flow rates of feed water and carrier air are greatly controlled by the wetting state of the tubes. In comparison with the previous desalination column installing the coppery tubes, the present column can reach nearly the same production capacity of distilled water, which demonstrates the feasibility of applying such a plastic column to the humidification and dehumidification desalination process.

关 键 词：DESALINATION HUMIDIFICATION dehumidification polypropylene shell-tube column 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]