變壓吸附法去除煙道氣中之SO2、NO2及CO2

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姓名

林英嫻(Ying-Xian Lin) 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

變壓吸附法去除煙道氣中之SO2、NO2及CO2
(Remove SO2,NO2 and CO2 from flue gas by pressure swing adsorption)

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摘要(中)

火力發電廠所排放出含有硫、氮、碳多成分氣體混合物是造成酸雨與溫室效應的主要原因。使用變壓吸附法濃縮及回收煙道氣中二氧化硫、二氧化氮與二氧化碳，使之再利用，為解決問題方法之一。近年來這方面的研究已成為處理火力發電廠廢氣之首要。
本研究主要利用模擬方式，採用雙塔四步驟與三塔六步驟兩階段真空變壓吸附程序，處理進料為0.5﹪SO2、0.13% NO2與18﹪CO2，其餘為N2之煙道氣，吸附劑分別採用Dowex MWA-1(weak-base resin)與13X zeolite。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。
此程序可將濃度為0.5﹪SO2濃縮至6.04%，回收率達83%；18﹪CO2濃縮至75%，回收率達62%；探討各製程操作變數(諸如：沖洗比、進料壓力與各個步驟操作時間等等)對程序效能的影響。

摘要(英)

The major cause for acid-rain and greenhouse-effect phenomena is the emission which carries gas mixture containing components sulfur，nitrogen and carbon from power plants that burn fossil fuel. The concentration and recovery of SO2，NO2 and CO2 from flue gas is important in solving such pollution problem. Vacuum swing adsorption (VSA) is a feasible technology for such purpose.
This study employes a two-stage VSA to concentrate and recover SO2，NO2 and CO2 from flue gas. The first SO2-VSA is a dual-bed four-step process using Dowex MWA-1 resin as adsorbent, and the second CO2-VSA is a three-bed six-step process using 13X zeolite as adsorbent. Non-isothermal simulation is performed for separation of SO2/NO2/CO2/N2 (0.5/0.13/18/81.37 vol %) system. This study uses the equilibrium model and the pressure drop can be neglected.
The SO2/CO2 (0.5/18 vol %) in the feed could be concentrated to (6.04/75 vol %) in product stream, having a recovery of (83/62 vol %) in this study. The effects of operating variables such as P/F ratio, adsorption pressure, steps time were investigated on the performance of this study.

關鍵字(中)

★ 變壓吸附

關鍵字(英)

★ pressure swing adsorption

論文目次

目錄 Ⅰ
表目錄 Ⅲ
圖目錄 Ⅴ
第一章緒論 1
第二章簡介與文獻回顧 3
2.1 變壓吸附法之簡介 3
2.1.1 變壓吸附基本原理 3
2.1.2 吸附劑及其選擇性 5
2.1.3 基本的變壓吸附程序 6
2.2 文獻回顧 8
2.2.1 理論之回顧 8
2.2.2 PSA程序的發展與改進 10
2.2.3 PSA製程在回收氣體污染物的應用 13
第三章理論 16
3.1 基本假設 17
3.2 統制方程式 18
3.3 吸附平衡關係式 22
3.4 參數推導 29
3.4.1 軸向擴散係數 29
3.4.2 管壁的熱傳係數 30
3.5 起始條件與邊界條件 31
3.6 求解的方法 32
3.6.1 閥公式 32
3.6.2 求解步驟 33
第四章製程描述 35
4.1 程式驗證 37
4.1.1 第一程序SO2-VSA(四步驟製程) 38
4.1.2 第二程序CO2-VSA(六步驟製程)…………….. 40
4.2 常數與操作條件 44
第五章結果與討論 51
5.1 模擬結果與驗證 51
5.2 沖洗比的影響….…………………………..…………56
5.3 進料壓力的影響….…………………………..………62
5.4 步驟時間的影響….…………………………..………68
5.5 結論………………….………………………..……... 81
符號說明 82
參考文獻 84
附錄A 流速之估算方法 90
附錄B 環保法規 94

參考文獻

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指導教授

周正堂(Cheng-Tang Chou)

審核日期

2004-6-26

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