碩士 / 國立臺北科技大學 / 化學工程研究所 / 100 / The membrane distillation (MD) has recently been developed to become an important technology in desalination become it owns some advantages，such as：simple design with modularity，high level of interface area and low installation and operating costs. Membrane distillation uses the driving forces coming from and the difference of vapor pressure across the membrane and the temperature difference between the hot sea water and the cold water，which is the difference between MD and other membrane technology for separation. In MD technology，the water vapor will pass a porous hydrophobic membrane and then the water comes out after the vapor goes through the cold end.
In this study，Teflon film PTFE (Polytetrafluoroethene) air gap membrane was used in the system to distill the simulated sea water，investigate the influence of the fluid flow pattern on the flux of permeation and estimate the theoretical flux of permeation. The water temperature at the cold end was set at 25℃ and the temperature difference between the hot and cold fluid was changed to enhance the efficiency of MD and the production of pure water. Based on the air gap membrane distillation model for desalination，there were four key factors：(a).the hot fluid inlet temperature (b). the volume of fluid flow (c). the size of membrane pores (d). sodium chloride (NaCl) concentration. Which would affect the water production and NaCl removal，to be discussed in this study. The experimental results showed that both of the NaCl removal rate and the water production were be increased with the hot fluid inlet temperature and the volume of fluid flow. The size of membrane pores did not affect the removal of NaCl that much but it would affect the water production rate.
| Identifer | oai:union.ndltd.org:TW/100TIT05063086 |
| Date | January 2012 |
| Creators | Chien-Chih Chen, 陳建智 |
| Contributors | Meng-Kang Huang, 黃孟槺 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 100 |
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