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    Title: 螺旋通道型氣隔式薄膜蒸餾模組之海水淡化理論與實驗研究
    Other Titles: Theoretical and experimental studies of concentric-tube air gap membrane distillation with helical wire on saline water desalination
    Authors: 吳昆逸;Wu, Kun-Yi
    Contributors: 淡江大學化學工程與材料工程學系碩士班
    張正良;何啟東;Chang, Cheng-Liang;Ho, Chii-Dong
    Keywords: 同心管;螺旋檔板;純水產量;海水淡化;Concentric-tube AGMD;Wire helix;Pure water productivity;Desalination
    Date: 2015
    Issue Date: 2016-01-22 15:02:14 (UTC+8)
    Abstract: 氣隔式薄膜蒸餾原理乃是利用薄膜兩側的飽和蒸汽壓差為驅動力促使水蒸氣通過薄膜及其氣隔層後,在冷凝板上冷凝,進而達到分離的效果,然而,當薄膜蒸餾發生所謂的溫度極化現象時,其對於系統產能會有相當顯著的影響,此現象越明顯則產能相對低落。
    本研究針對套管型氣隔式薄膜蒸餾之主要設備進行效率改善的研究,目的為:(1)設計螺旋因子,以增加熱側熱流體在系統內部之滯留時間,並增加熱交換,進而提升透膜通量,並歸納出一新型納賽數經驗公式 (2)藉由一維數學模型針對氣隔式薄膜蒸餾熱量與質量傳送機制進行研究,配合實驗分析以驗證經驗公式與數學模型的正確性,並探討在不同之設計參數及操作條件對於薄膜蒸餾系統之流體溫度分佈、溫度極化現象、純水透膜通量增加百分率與水力損耗提升百分率的影響。
    根據研究結果顯示,套管型氣隔式薄膜蒸餾薄膜蒸餾系統之理論值與實驗值的相對誤差總平均為9.02 %,而添加螺旋檔板後能夠有效的提升系統透膜通量,在本研究設定的操作條件之中,最高可達到約31%的增益。
    The air gap membrane distillation (AGMD) module contains a stagnant air gap interposed between the membrane and condensation surface contacting with the cold stream. A new design of the capillary AGMD device winding a wire helix within the annulus of the concentric circular tube was investigated theoretically and experimentally in aiming to increase the pure water productivity in saline water desalination. The hot sea water stream flowing through the annulus of a concentric circular AGMD module, which a tight fitting wire spiral in a small annular spacing is inserted, could enhance the improvement of device performance. With decreasing of the concentric tube curvature as compared to the small thickness of the annulus, the heat transfer behavior in helical channel is approaching the heat transfer in straight flat channel. The effects of various operation parameters including the fluid inlet temperature, volumetric flow rate, air gap thickness and spiral wire pitch on the heat transfer efficiency and pure water productivity are also delineated. In addition, the mathematical treatment proposed in this study to correlate the simplified equation for estimating the heat transfer coefficient can also be applied to the porous membranes in MD processes.
    Appears in Collections:[化學工程與材料工程學系暨研究所] 學位論文

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