隨著因人類活動造成的全球暖化日漸嚴重，若人們持續製造並排放大量溫室氣體，將會使全球暖化加劇。因此，致力於降低二氧化碳排放量，以避免未來不可挽回的氣候變遷，為目前重要的議題。 近年來，科學家們提出許多捕獲二氧化碳的技術。因壓力變動式吸附捕集技術具有低能耗、低建廠設備投入且高工作量的優勢，我們採用此技術進行二氧化碳捕集的研究。本研究使用華懋科技股份有限公司製造之吸附性管式膜作為吸附材，並模擬分離電廠煙道氣成分，採用15%二氧化碳和85%氮氣的混合器作為進料氣體。 在此研究中，我們使用數位記錄微量天平，測量吸附材在二氧化碳與氮氣環境下之等溫吸附平衡曲線，並從等溫吸附曲線計算吸附劑之平衡選擇率來評估吸附性管式膜之吸附效能，再將實驗數據用Langmuir-Freundlich等溫吸附式擬合得到式中各參數。 第二部分我們對填塔式管式膜模組進行突破實驗，在相同壓力、室溫且進料氣體成分為15%二氧化碳的進料條件下，改變吸附材的再生方法或進料流量測量其飽和吸附容量，並探討其影響。 最後，利用田口品質工程方法配合實驗設計法，規劃各個實驗的實驗變因配置，以在最少的實驗次數下，準確的統計實驗性能及預測其在單塔四步驟操作下最佳的表現。此研究選定吸附脫附時間、進料流量和同向減壓壓力為主要分析的因子，並針對此三個主要因子，分析計算其回歸模型以預測其他配置的實驗結果，得到當操作條件為270秒吸附脫附時間、進料流量3.98 L/min和同向減壓壓力為0.3 bar時，有最高純度84.06%，此時回收率為65.98%。 ;The effects of human-caused global warming are getting serious year by year, and will worsen as long as humans generate more greenhouse gases, especially carbon dioxide, to the atmosphere. If we can reduce carbon dioxide emission, we may avoid some of the worst effects. Currently, there are various technologies for capturing carbon dioxide. Due to the advantages of low energy consumption, low capital investment and highly operating capability, the pressure swing adsorption (PSA) technology was chosen in this study. The adsorptive tubular membrane fabricated by Desiccant Technology Co., Ltd. (DTECH) will be used as the adsorbent material for separating capturing carbon dioxide (15% v/v) and nitrogen, simulating the flue gas from coal-fired power station. In this study, Thermo Cahn D-200 Digital Recording Balance is used to measure the isotherm behaviors of pure carbon dioxide and nitrogen gases. The equilibrium selectivity was calculated from isothermal data to consider the separating performance of DTC tubular membrane. The Langmuir-Freundlich isotherm model was used to fit the experimental data of the isotherm and to obtain the parameters. Subsequently, the breakthrough experiments were conducted by using the tubular-membrane-filled bed to measure the fully saturated adsorption capacity of the adsorbent bed under different flow rates at constant pressure and room temperature with the feeding composition of 15% CO2 and 85% N2. Finally, the single-bed four-step PSA experiment was processed and serial designed experiments by Taguchi method and design of experiments will be tested and analyzed. The major impact factors of adsorption and desorption time, feed flow rate and co-current depressurization from the data analyzed from PSA experiments are determined and the regression model are investigated. The optimal operating conditions are 270 s adsorption and desorption time, 3.98 L/min feed flow rates and 0.3 bar co-current depressurization pressure with CO2 product purity 84.06% and recovery 65.98%.
