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研究生:陳柏志
研究生(外文):Bor-Chi Chen
論文名稱:錯流式旋轉填充床應用於二氧化碳吸收之研究
論文名稱(外文):Removal of Carbon Dioxide by Absorption in a Cross-Flow Rotating Packed Bed
指導教授:林佳璋林佳璋引用關係
指導教授(外文):Chia-Chang Lin
學位類別:碩士
校院名稱:長庚大學
系所名稱:化工與材料工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:138
中文關鍵詞:二氧化碳錯流式旋轉填充床吸收
外文關鍵詞:Carbon DioxideCross-Flow Rotating Packed BedAbsorption
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旋轉填充床是利用離心力的方式將填充床高速旋轉以產生超重力場,在此重力場中液體會因離心力的作用產生高度的分散現象,以增加氣、液的接觸面積,進而提升氣、液質傳效果,並達到快速混合與分離的目的。旋轉填充床相較於一般傳統填充床具有低液泛、高處理量、較小空間需求、高質傳效率、低能源耗用及低操作成本等優點。逆流式旋轉填充床在氣提、吸收、蒸餾、脫氧等單元操作程序上,已展現其強化氣、液間質傳,並成為高效率的氣、液接觸器。
本研究主要探討錯流式旋轉填充床應用於吸收二氧化碳的適用性,測試系統選用氫氧化鈉、單乙醇胺(MEA)和2-胺基-2-甲基-1-丙醇(AMP)水溶液作為吸收1%的二氧化碳的吸收劑。錯流式旋轉填充床內半徑為2.4cm、外半徑4.4cm、軸向高度為12cm。填充床中所使用的填充物為不鏽鋼金屬絲網,轉速在600~1800rpm之間變動。由實驗結果可知,氣相質傳係數會伴隨著轉速、氣體流量、液體流量及吸收劑濃度的增加而上升,並會隨著二氧化碳濃度的增加而下降,使用MEA時具有較好的質傳效果。與逆流式旋轉填充床比較,顯示具有相當於逆流式徐轉填充床的質傳效果,另外由於錯流式旋轉填充床具有無液泛點的特性,因此將其應用在處理高氣體流量中的煙道氣處理具有極大的潛力和競爭力。
A rotating packed bed (RPB) for enhancing gas-liquid mass transfer is to contact liquid and gas in a centrifugal field by rotating a doughnut-shaped packing element. It can provide a thinner liquid film and small droplet to increase gas-liquid contact area owing to high centrifugal acceleration. It has a low tendency of flooding, high process capacity, small spatial requirement, high efficiency, low energy consumption and low operating costs. A countercurrent-flow RPB has been demonstrated to be a high-efficiency gas-liquid contactor in distillation, absorption, stripping and deaeration.
A cross-flow RPB was investigated for its applicability in carbon dioxide absorption. The test system involved the absorption of carbon dioxide by sodium hydroxide, monoethanolamine (MEA) and 2-amino-2-methyl-1-propanol (AMP) solution. The cross-flow RPB has an inner radius of 2.4 cm, an outer radius of 4.4 cm and an axial height of 12.0 cm. Wire mesh was used as packing. Rotor speeds ranged from 600 to 1800 rpm. The overall volumetric gas-side mass transfer coefficient (KGa) increased with CO2 concentration. MEA aqueous solution was superior to NaOH and AMP aqueous solutions at the same absorbent concentration for CO2 absorption.
The obtained results demonstrated that a cross-flow RPB could achieve mass transfer efficiencies equivalent to countercurrent-flow RPB. Consequently, a cross-flow RPB without flooding point would be applicable in the removal of carbon dioxide from the gas stream with higher flow rate by absorption with great potential.
摘要 Ⅰ
Abstract Ⅱ
目錄 Ⅲ
圖目錄 Ⅵ
表目錄 Ⅸ
第一章 序論 1
1.1 前言 1
1.2 研究目的 2
第二章 文獻回顧 4
2.1 二氧化碳回收及再利用技術 4
2.1.1 二氧化碳回收技術 4
2.1.2 鹼液吸收二氧化碳的反應機制 8
2.1.2 二氧化碳再利用技術 10
2.2 旋轉填充床之簡介 10
2.2.1 旋轉填充床的起源與構造 11
2.2.2 逆流式旋轉填充床 12
2.2.3 錯流式旋轉填充床 13
第三章 實驗裝置、藥品與實驗方法 16
3.1 實驗裝置 16
3.2 實驗藥品及分析儀器 18
3.3 實驗方法 19
3.3.1 壓降測量 19
3.3.2 鹼液吸收二氧化碳實驗程序 20
3.4 吸收特性的探討 22
第四章 結果與討論 26
4.1 壓降特性探討 26
4.1.1 轉速對壓降的影響 26
4.1.2 氣體流量對壓降的影響 29
4.1.3 液體流量對壓降的影響 31
4.2 氫氧化鈉吸收二氧化碳 34
4.2.1 轉速對吸收特性的影響 34
4.2.2 氣體流量對吸收特性的影響 37
4.2.3 液體流量對吸收特性的影響 39
4.2.4 氫氧化鈉濃度對吸收特性的影響 41
4.2.5 二氧化碳濃度對吸收特性的影響 43
4.3 MEA吸收二氧化碳 47
4.3.1 轉速對吸收特性的影響 47
4.3.2 氣體流量對吸收特性的影響 50
4.3.3 液體流量對吸收特性的影響 52
4.3.4 MEA濃度對吸收特性的影響 54
4.3.5 二氧化碳濃度對吸收特性的影響 56
4.4 AMP吸收二氧化碳 60
4.4.1 轉速對吸收特性的影響 60
4.4.2 氣體流量對吸收特性的影響 63
4.4.3 液體流量對吸收特性的影響 65
4.4.4 AMP濃度對吸收特性的影響 67
4.4.5 二氧化碳濃度對吸收特性的影響 69
4.5 三種吸收劑的比較 73
4.5.1 三種吸收劑對二氧化碳去除效果的比較 73
4.5.2 三種吸收劑的成本比較 77
4.6 與逆流式旋轉填充床之比較 81
第五章 結論與建議 85
5.1 結論 85
5.2 建議 88
參考文獻 89
符號說明 94
附錄A 轉速、氣體及液體流量計校正曲線 97
附錄B 錯流式旋轉填充床壓降實驗數據 99
附錄C 鹼液吸收二氧化碳實驗數據 100
附錄D Matlab程式求質傳係數 130
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