本研究之目的為模擬計算直接接觸式薄膜蒸餾與真空式薄膜蒸餾於海水淡化之滲透通量，並比較其性能差異，透過改變不同的操作參數(進料流量、溫度、濃度)來探討各參數對於濾速之影響，以此做進一步討論最適化操作下之操作條件。
結果顯示本研究結合各項海水物性變數並由Dusty-Gas model模擬之滲透通量相當吻合實驗值。溫度極化效應對MD系統影響甚鉅，而VMD系統雖然其極化現象較易獲得改善而有效提高滲透通量，但在VMD系統會因滲透通量的上升而增加其操作成本。成本評估成果顯示，DCMD系統比VMD系統較適合達到經濟規模的設置。
在DCMD，增大物料流率可降低溫度極化及濃度極化現象，其中增大進料側流率會提高熱使用效率，但濾液側流率增大會因透膜熱傳導量增加而降低熱使用效率。

The objectives of this study included the flux estimation of DCMD and VMD in seawater desalination and their comparisons, and aimed to investigate the optimal operating conditions for seawater desalination. The operating parameters in the simulation included the feed flow rate, temperature and concentration.
    The simulation results based on considering the combination of Dusty-Gas model with the seawater properties agree very well with the experimental data. The results also show that the temperature polarization has a significant influence on the flux. The polarization phenomena in the VMD system can be easier improved to increase the distillate flux. However, the operating cost of VMD increases with the increase of distillate flux. The cost evaluation shows that the DCMD system is more economic than the VMD system.
Both the temperature and concentration phenomena can be reduced by increasing the flow rates in the DCMD system. It is noted that increasing the feed side flow rate also enhances the thermal efficiency, while increasing the flow rate in distillate side will raise the heat conduction through the membrane and result in lowering the thermal efficiency.

目錄
第一章	緒論	1
1.1前言		1
1.2薄膜分離程序	2
1.3薄膜蒸餾	8
第二章	文獻回顧	11
2.1薄膜蒸餾相關研究	11
2.2薄膜蒸餾法之種類	14
2.3薄膜之性質	16
2.4影響滲透通量的因素	18
2.5提高滲透通量的方法	20
第三章	理論計算	30
3.1理論分析之假設	30
3.2質量傳送	32
3.3熱量傳送	36
3.4極化現象之影響	38
3.5熱質傳經驗方程式	42
第四章	結果與討論	47
4.1模擬系統	47
4.2平板系統DCMD之滲透通量模擬	49
4.3VMD系統之滲透通量模擬	56
4.4各參數對溫度極化之影響	62
4.5各參數對濃度極化之影響	64
4.6各操作條件對熱使用效率之影響	67
4.7成本估算	70
第五章	結論	73
符號說明		75
參考文獻		78

圖目錄
圖 1.1	薄膜分離程序之分類……………………………………………………7
圖 2.1	DCMD 示意圖…………………………………………………24
圖 2.2	AGMD 示意圖…………………………………………………24
圖 2.3	SGMD 示意圖………………………………………………25
圖 2.4	VMD 示意圖………………………………………………25
圖 2.5	提高濾速之方法………………………………………………26
圖 2.6	逆洗程序示意圖………………………………………………27
圖 2.7	流體亂流產生器………………………………………………28
圖 2.8	氣液兩相的流動型態……………………………………………29
圖 3.1	DCMD系統熱質傳示意圖………………………………………44
圖 3.2	DCMD質傳阻力示意圖…………………………………………45
圖 3.3	Multipore size model之電路阻力類比示意圖……………………45
圖 3.4	DCMD熱傳阻力示意圖…………………………………………46
圖 4.1	薄膜蒸餾理論計算流程圖………………………………………49
圖 4.2	DCMD平板於不同進料溫度之純水滲透通量………………………51
圖 4.3	DCMD平板於不同進料流量之純水滲透通量……………………51
圖 4.4	DCMD平板於不同進料濃度之滲透通量………………………………53
圖 4.5	DCMD平板於不同進料濃度與極化係數關係……………………53
圖 4.6	DCMD平板於不同進料溫度之滲透通量………………………………54
圖 4.7	DCMD平板於不同進料速度與進料溫度之滲透通量…………………55
圖 4.8	VMD平板於不同進料溫度之純水滲透通量與DCMD比較……………………57
圖 4.9	VMD平板於不同進料溫度之純水滲透通量與DCMD比較…………57
圖 4.10	VMD 平板於不同真空側壓力之純水滲透通量………………………58
圖 4.11	VMD平板於不同進料濃度之滲透通量………………………………59
圖 4.12	VMD平板於不同進料溫度之滲透通量………………………………60
圖 4.13	VMD平板於不同進料溫度之滲透通量………………………………61
圖 4.14	DCMD平板海水於不同進料速度之TPC………………………………63
圖 4.15	VMD平板海水於不同進料速度之TPC………………………………63
圖 4.16	DCMD平板海水於不同進料速度之CPC………………………………65
圖 4.17	DCMD平板海水於不同進料溫度之CPC………………………………65
圖 4.18	VMD平板海水於不同進料溫度之CPC………………………………66
圖 4.19	DCMD平板海水於不同物料溫度之熱使用效率……………………68
圖 4.20	DCMD平板海水於不同物料流量之熱使用效率……………………69
圖 4.21	DCMD平板海水於不同物料溫度之下cost關係圖……………………71
圖 4.22	VMD平板海水於不同進料溫度及總壓cost關係圖………………71
圖 4.23	DCMD平板海水於不同物料流量之cost………………………………72
圖 4.24	VMD平板海水於不同進料溫度與流量cost關係圖……………72

表目錄
表1.1	不同操作程序之驅動力分類…………………………………………6 
表4.1	平板薄膜性質說明………………………………………………………48

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