本研究以模擬方式，進行氫氣穿越鈀基膜管之濃度極化現象與分離氫氣效率研究與分析。藉由數值結果，了解極化現象對氫氣滲透的影響，並提供膜管最佳化操作參數，作為實驗之參考依據，本文主要分為兩大部分，如下所述。
第一部份首先依據實驗設備建立幾何模型，以四種操作參數分別為壓差、氫含量、雷諾數及滲透係數，探討參數對於極化現象之影響。模擬結果指出，在高操作壓差、高薄膜滲透係數、低氫含量及低混合氣流率等操作條件下，極化現象更趨嚴重；使得以穩態混流反應器（CSTR）概念之經驗式預測本柱塞流反應器（PFR）氫滲透通量失準，並指出以穩態混流反應器概念之席維斯定律預測氫滲透，僅於氫滲透率低於30%較為準確。
第二部分為在膜管中加入掃氣，研究流動型態及掃氣流率對於氫氣滲透現象與極化現象之影響。實驗結果指出，相較於同流向模式下，反流向模式可達到更高氫氣分離效率；且當混合氣進氣量低時，更是存在著達到完全氫氣回收之可能性。然而低混合氣及低掃氣進料會使薄膜表面極化現象更為嚴重，為找出在固定操作環境下之較佳氫氣分離效果，調整混合氣及掃氣進料流率以找出最佳化操作條件，並以一反正切函數描述之，作為實驗於固定混合氣進料下控制掃氣流率操作條件之參考依據。

The influence of concentration polarization and separation efficiency for hydrogen through palladium-based membrane was investigated by simulation. According the numerical results, how the concentration polarization affecting H2 permeation and finding out the optimized conditions to refer to experiment are mentioned in this study. There are two parts in this study.
In the first part of this research, a model base on the experimental equipment is constructed. Four important parameters which are the pressure difference, H2 molar fraction, Reynolds number, and membrane permeance affecting H2 permeation proceed a extensive survey. The predictions indicate that increasing pressure difference or membrane permeance facilitates H2 permeation rate; concentration polarization is thus triggered. Alternatively, when Reynolds number or H2 molar fraction decreases along with a higher permeance, the deviation of plug flow reactor (PFR) from continuous stirred tank reactor (CSTR) grows, even though H2 permeation rate declines. From the obtained results, it is concluded that the H2 permeation rate can be predicted by Sieverts’ law if the H2 permeation ratio is no larger than 30%.
In the second part of this research, the sweep gas is added into the membrane tube to seek the influences of flow pattern and sweep gas on hydrogen permeation and polarization. The predicted results suggest that the counter-current mode are able to give the better performance of hydrogen separation compared to the co-current mode, and complete hydrogen recovery can be achieved if the flow rate of feed gas is low to a certain extent. However, lower flow rates of feed gas and sweep gas will trigger serious concentration polarization on the membrane surface. The transport of feed gas into the membrane tube from the lumen side or the shell side is flexible. The optimum Reynolds number of sweep gas in accordance with the Reynolds number of feed gas can be correlated by an arc tangential function which is able to provide a reference for the operation of hydrogen separation by controlling sweep gas.

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