(3.237.178.91) 您好!臺灣時間:2021/03/04 09:12
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:吳奇展
研究生(外文):Wu, Chi Chan
論文名稱:薄膜蒸餾之海水淡化之研究
論文名稱(外文):Study of Membrane Distillation Process for Seawater Desalination
指導教授:邱政勳, 馬哲儒
指導教授(外文):Chiu Cheng-Hsun, Ma Che-Ju
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:84
中文關鍵詞:薄膜蒸餾海水淡化疏水性空氣間隙
外文關鍵詞:membrane distillationdesalinationhydrophobicair-gap
相關次數:
  • 被引用被引用:11
  • 點閱點閱:426
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:1
近年來,由於世界各國的人口遽增及經濟的快速成長,水的需求日漸
增加,開發新水源已是一個世界性的重要問題,當然我國也不例外,有鑑
於此,本文將以薄膜蒸餾法(membrane distillation)來做為海水淡化
的另一種選擇。 而所謂的薄膜蒸餾就是兩種不同的溶液在不同的溫度
下,被一多孔且疏水性的薄膜分隔,因薄膜兩側溶液溫度的差異,相對地
產生不同的蒸氣壓力,由於這個壓力差所產生驅動力,使得高溫液體的水
分子在薄膜的一端蒸發,經過薄膜,然後在另一側凝結,稱之為薄膜蒸餾
。 在薄膜蒸餾法中,本文是以空氣間隙薄膜蒸餾(air-gap membrane
distillation)為主題,針對傳輸過程中的熱、質傳理論加以推導,並以
實驗相互證明,此外也針對薄膜的種種特性加以實驗分析,去探討薄膜的
使用壽命,最後將實驗前後的薄膜利用電子顯微鏡觀察,分析不同材質薄
膜的組織結構變化。 由實驗結果得知,滲透流量隨著飼水溫度的增加
成指數比例的增加,而對於飼水中鹽水濃度的增加其滲透量只有稍許的下
降,至於冷卻水流率對滲透量的影響可忽略不計。從電子顯微鏡觀察到薄
膜使用前後之結構變化發現,當薄膜兩側的溫差過大,將導致薄膜表面被
鹽結晶顆粒所阻塞,造成滲透流量的下降,甚至破壞薄膜本身之結構。
As the increase of global population compound with the rapid
economic growthin mant developing countries, the demand for
fresh water in those areas hasresen to a record level.
Therefore, seeking a good clean water resource hasbecome an
important domestic as well as worldwide issue. It is believed
thesea water desalination may be the ultimate way to provide
enough fresh water.Among many desalination methods, membrane
distillation method is chosen as the interesting method in my
study to investigate its performance in separatingthe fresh
water from brine water.Membrane distillation is a process in
which two solutions at different temperatures are separated by
a microporous membrane. Because temperaturedifference which
causes a corresponding vapor pressure difference across
themembrane provides the driving force of the membrane
distillation process. Thevapor evaporates through a porous
membrane, and condenses on a coolant surfaceat the other side of
the membrane. This paper is focused on air-gap membrane
distillation (AGMD). A single stageAGMD facility is set up to
investigate the transfer process, and the obtained data is
confirmed by the theory of heat and mass transfers. Various
kinds ofmembrane are used to examine the relationship between
the permeate flux andmany other important parameters such as
feed and cooling temperatures,membrane pore size, porosity etc.
Finally, the scanning electron microscopy(SEM) is used to
observe and analyze the detailed structure of membrane andthe
crystallized salt on the membrane surface.The obtained
experimental results show that the permeate flux increases
exponentially with an increase in hot side temperature and is
only slightly affected by the increase in salt concentration,
and it*s hardly changed with the coolant flow rate. As the
temperature difference between the feed solution and cooling
flow increases, the effect due to polarization become obvious.
The crystallized salts are found ( under SEM ) to block the
membrane pores and result in the reduce of permeate flux or even
the damage of membrane structure.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
無相關期刊
 
系統版面圖檔 系統版面圖檔