以變壓吸附法回收水煤氣反應後合成氣中二氧化碳之模擬

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姓名

黃緯農(Wei-Nung Huang) 查詢紙本館藏

畢業系所

化學工程與材料工程學系

論文名稱

以變壓吸附法回收水煤氣反應後合成氣中二氧化碳之模擬

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摘要(中)

本研究利用變壓吸附法回收水煤氣反應後合成氣中二氧化碳，將二氧化碳濃縮並加以封存，根據美國能源部報告書之封存標準為二氧化碳濃度90%、回收率90%，如此可減少二氧化碳之排放，以避免溫室氣體對環境的持續惡化。
合成氣的進氣組成為41.4%二氧化碳、1.3%一氧化碳和57.3%氫氣，本研究使用UOP 13X沸石作為吸附劑，以Langmuir-Freundlich為模型迴歸吸附劑對各成份氣體的之等溫平衡吸附曲線以取得各項參數，利用理論計算線性驅動力質傳係數用於程序模擬，並與突破曲線實驗、脫附實驗及單塔四步驟程序實驗結果進行驗證，證明程式的可靠度。
最後採用雙塔六步驟變壓吸附程序進行模擬，藉由探討不同的操作變因以尋求最適化操作條件並嘗試提高溫度，以進料壓力3.95 atm，塔長110 cm，真空壓力0.05 atm、高壓吸附160秒，同向減壓10秒，抽真空130秒，平衡時間5秒，溫度393 K為最終操作條件，其塔底二氧化碳濃度達95.3%，回收率97.6%，預期可作為小型試驗工廠之操作條件。

摘要(英)

This research studies the separation and concentraion of carbon oxide from syngas after water gas shift reaction by pressure swing adsorption (PSA) process. According to the NETL report , the compositions of syngas are 41.4% carbon dioxide ,1.3% carbon oxide and 57.3% hydrogen.
The commercialized UOP 13X zeolite is used as adsorbent in this study. First of all, Langmuir-Freundlich isotherm equation is uesd to regress the isotherm data to obtain the parameters of CO2, N2, CO, H2. The linear driving force (LDF) model were calculated by theory. In order to test the reliability of the simulation program, we also compare the simulation program with breakthrough curve , desorption curve experiment and the results of a single-bed four-step process experiments.
Finally, we employ dual-bed six-step PSA process for syngas feed to find the optimal operating conditions and try to rise temperature. The optimal operating conditions can be obtained by assessing different operating variables. The results of final conditions are 95.3% purity and 97.6% recovery of CO2 in bottom product.

關鍵字(中)

★ 變壓吸附
★ 合成氣
★ 二氧化碳

關鍵字(英)

論文目次

摘要 I
ABSTRACT II
誌謝 III
目錄 IV
圖目錄 VIII
表目錄 XIV
第一章、緒論 1
第二章、簡介及文獻回顧 4
2-1 吸附之簡介 4
2-1-1 吸附基本原理 4
2-1-2 吸附劑及其選擇性 6
2-2 文獻回顧 8
2-2-1 PSA程序之發展與改進 8
2-2-2 理論之回顧 12
2-3 研究背景與目的 15
第三章、理論 19
3-1 基本假設 20
3-2 統制方程式 21
3-3 吸附平衡關係式 26
3-3-1 等溫吸附平衡關係式 26
3-3-2 質傳驅動力模式 26
3-3-3 吸附熱關係式 27
3-4 參數推導 28
3-4-1 軸向分散係數 28
3-4-2 熱傳係數 31
3-4-3 線性驅動力質傳係數 34
3-5 邊界條件與流速 37
3-5-1 邊界條件與節點流速 37
3-5-2 閥公式 38
3-6 求解步驟 39
第四章、等溫平衡吸附曲線與吸脫附曲線 42
4-1 吸附平衡(ADSORPTION EQUILIBRIUM) 43
4-1-1 氣體與吸附劑性質 43
4-1-2 等溫平衡吸附曲線(Isotherm) 45
4-2 吸附動力學(ADSORPTION KINETICS) 51
4-2-1 線性驅動力質傳係數 51
4-2-2 突破曲線模擬驗證 52
4-2-3 脫附實驗模擬驗證 57
第五章、製程描述 63
5-1 單塔四步驟變壓吸附程序 64
5-2 雙塔六步驟變壓吸附程序 66
5-3 產率與能耗計算 68
第六章、數據分析與結果討論 70
6-1 單塔四步驟變壓吸附法捕獲合成氣中二氧化碳之驗證 70
6-1-1 高壓吸附時間對雙成份單塔四步驟PSA製程之影響 72
6-1-2 抽真空時間對雙成份單塔四步驟PSA製程之影響 76
6-1-3 進氣組成對單塔四步驟PSA製程之影響 82
6-2 合成氣進料單塔四步驟變壓吸附程序之模擬 84
6-2-1 高壓吸附時間對單塔四步驟PSA製程之影響 85
6-2-2 抽真空時間對單塔四步驟PSA製程之影響 88
6-2-3 同向減壓時間對單塔四步驟PSA製程之影響 91
6-2-4 塔長對單塔四步驟PSA製程之影響 94
6-3 合成氣進料雙塔六步驟變壓吸附程序之模擬 97
6-3-1 進料壓力對雙塔六步驟PSA製程之影響 99
6-3-2 高壓吸附時間/抽真空時間對雙塔六步驟PSA製程之影響 104
6-3-3 高壓吸附時間/同向減壓時間對雙塔六步驟PSA製程之影響 110
6-3-4 壓力平衡時間對雙塔六步驟PSA製程之影響 115
6-3-5 塔長對雙塔六步驟PSA製程之影響 120
6-3-6 抽真空壓力對雙塔六步驟PSA製程之影響 127
6-3-7 溫度對雙塔六步驟PSA製程之影響 133
第七章、結論 138
7-1 結論 138
符號說明 144
參考文獻 149
附錄A、流速之估算方法 155

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指導教授

周正堂(Cheng-Tung Chou)

審核日期

2016-8-9

推文