本文以數值模擬方式探討固定床捕碳劑再生反應器製程放大之均溫設計，討論在不同條件下的反應器內部溫度均勻性與CO2脫附性能。利用內部裝設導熱零件及鰭片設計，以及討論內外部加熱方法，使反應管內部溫度分布更均勻，以消除熱點，讓捕碳劑可以發揮其最大效能，以增加捕獲效率及使用循環次數。模擬結果顯示，在脫附850 ℃的情況下，若將一般之反應圓管直徑由1吋放大到4吋時，在相同條件下，脫附性能約只剩下58 %。而在反應器中加入軸向鰭片之中空圓管，可以有效的改善管內溫度分布不均的問題，並提升脫附性能。結果也顯示內部裝設導熱零件的中空圓環，其最佳中空圓環半徑(Ri)會隨材質、鰭片數及加熱方法而有所不同。在相同材質和鰭片數的情況下，各取最佳Ri值時，內部加熱僅需較少的加熱面積即可與外部加熱有相同效果。

The aim of this study is to design a uniform temperature distribution in scale-up fixed bed reactors with inserting the internal heat conducting part and different heating methods by numerical simulation. The performance of sorbents, the relevant capture efficiency and the number of running cycles can be improved due to the absence of hot spots. The simulation results show that the performance of desorption is only 58 % at 850 ℃ for the original design as the diameter of the reaction tube is increased from 1 inch to 4 inches. The reactor can be effectively improved by adding axial fins in hollow reactors because the temperature distribution becomes more uniform. The results also show that the best hollow ring radius will vary with the material, the number of fins and heating method. The method of internal heating is better than that of external heating for fixed material and the number of fins.

摘要 I
Abstract II
致謝 III
第一章緒論 1
1.1 前言 1
第二章簡介與文獻回顧 3
2.1 二氧化碳捕獲技術概況 3
2.2 固態捕碳劑 4
2.3二氧化碳捕獲反應器 7
2.4碳酸鈣熱分解 9
2.5研究目的 15
第三章數值模型模擬 17
3.1 模擬軟體介紹 17
3.2 模型 18
3.2.1 物理說明與基本假設 19
3.2.2 統御方程式 19
3.2.3 化學動力學 20
3.2.4 邊界條件 22
3.2.5 模擬過程 23
3.3 分析目標 26
3.3.1 簡化模型分析 26
3.3.2 進階模型分析 30
第四章結果與討論 33
4.1 簡化模型分析 33
4.1.1 反應器尺寸對CO2脫附性能的影響 33
4.1.2 內部導熱零件對CO2脫附性能的影響 37
4.1.3加熱方式對CO2脫附性能的影響 41
4.2 進階分析 50
第五章結論 54
5.1 結論 54
5.2 未來展望 55
參考文獻 56

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