兩階段變壓吸附程序濃縮與回收廢氣中
CO2與SO2之研究

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姓名

周萬發(Wan-Fa Chou) 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

兩階段變壓吸附程序濃縮與回收廢氣中 CO2與SO2之研究
(Study of Recovery and Concentration of SO2 / CO2 from Flue Gas by Two-Stage Pressure Swing Adsorption )

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摘要(中)

在本論文中利用二階段真空變壓吸附(two-stage vacuum swing adsorption)製程來分離煙道氣中的SO2，CO2 和NO2。將進料組成設為18%CO2、0.5%SO2、0.13%NO2、其餘為N2 。第一階段SO2-VSA (vacuum swing adsorption) 程序吸附劑採用Doewx MWA-1處理二氧化硫與二氧化氮，吸附等溫線為loading ratio correlation等溫線；第二階段CO2-VSA程序吸附劑採用13X沸石處理二氧化碳，吸附等溫線為Langmuir等溫線。模擬時所用的氣體分離機構為平衡模式，假設吸附塔內的同一截面積上固、氣兩相瞬間達成平衡，且為非恆溫之變壓吸附模式，因吸附劑顆粒大，故可忽略吸附塔內壓力降。在操作過程中，將第一階段SO2-VSA所釋出的廢氣儲存在儲存槽中，而第二階段CO2-VSA是以儲存槽中的氣體為進料，進一步處理CO2 氣體。
二階段VSA係同時模擬，此程序可將為0.5﹪SO2濃縮至6.43%，回收率達92.13%；0.13﹪NO2濃縮至1.00%，回收率達54.99%；18﹪CO2濃縮至71.88%，回收率達84.31%；本研究並探討各操作參數(諸如：各個步驟操作時間、儲存槽體積與沖洗比，進料壓力和脫附壓力等)對程序效能的影響。

摘要(英)

This study uses a two-stage vacuum swing adsorption process to separate SO2, NO2 and CO2 from flue gas. Simulation is performed for the bulk separation of SO2/NO2/CO2/N2 (0.5/0.13/18/81.37 vol %) system. The first stage of SO2-VSA (vacuum swing adsorption) utilizes Dowex MWA-1 as adsorbent to recover SO2 and NO2, and the second stage of CO2-VSA utilizes 13X zeolite as adsorbent to recover CO2. The equilibrium mixture adsorption in SO2-VSA and CO2-VSA can be expressed by the loading ratio correlation (LRC) and extended Langmuir isotherm, respectively. This study uses the equilibrium model and the pressure drop can be neglected. We assumed instantaneous equilibrium between the solid and gas phase with non-isothermal operation. In operating process, the waste stream of SO2-VSA is taken as the feed stream of CO2-VSA.
Two-stage vacuum swing adsorption process is simultaneously simulated. The 0.5%SO2 in the feed can be concentrated to 6.43% in the product with a recovery of 92.13%, the 0.13%NO2 in the feed can be concentrated to 1.00% in the product with a recovery of 54.99%, and the 18%CO2 in the feed can be concentrated to 71.88% in the product with a recovery of 84.31%. The effects of operating variables such as tank volume, P/F ratio, adsorption pressure, desorption pressure, and steps time are investigated on the performance of this study.

關鍵字(中)

★ 模擬
★ 真空變壓吸附
★ 二氧化碳
★ 二氧化硫

關鍵字(英)

★ simulation
★ vacuum swing adsorption
★ carbon dioxide
★ sulfur dioxide

論文目次

目錄 I
表目錄 IV
圖目錄 VI
第一章緒論 1
第二章簡介與文獻回顧 2
2.1變壓吸附法之簡介 2
2.1.1變壓吸附基本原理 2
2.1.2 吸附劑及其選擇性 3
2.1.3 變壓吸附典型步驟 4
2.2 文獻回顧 7
2.2.1 PSA程序之發展與改進 7
2.2.2 理論之回顧 10
2.2.3 PSA製程在回收氣體污染物的應用 12
第三章理論 15
3.1 基本假設 16
3.2 統制方程式 17
3.3 吸附平衡關係式 21
3.3.1 第一階段SO2-VSA吸附平衡關係式 21
3.3.2 第二階段CO2-VSA吸附平衡關係式 28
3.4 參數推導 35
3.4.1 軸向分散係數 35
3.4.2 管壁的熱傳係數 36
3.5 起始條件與邊界條件 37
3.6 求解的方法 38
3.6.1 閥公式 38
3.6.2 求解步驟 39
第四章製程描述 41
4.1.1 第一階段SO2-VSA之三塔六步驟製程 44
4.1.2 第二階段CO2-VSA之三塔六步驟製程 45
4.2.1 第一階段SO2-VSA之常數與操作條件 49
4.2.2 第二階段CO2-VSA之常數與操作條件 55
第五章結果討論與數據分析 59
5-1儲存槽體積對SO2-VSA和CO2-VSA的影響 66
5-2 t1時間對SO2-VSA 和CO2-VSA的影響 78
5-3 t2時間對SO2-VSA 和CO2-VSA的影響 86
5-4沖洗比對SO2-VSA和CO2-VSA的影響 94
5-5進料壓力對SO2-VSA 和CO2-VSA的影響 110
5-6脫附壓力對SO2-VSA 和CO2-VSA的影響 118
5.4 結論 127
符號說明 129
參考文獻 131

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指導教授

周正堂(Cheng-tung Chou)

審核日期

2005-12-16

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