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研究生： 李柏翰
Lee, Po-Han
論文名稱： 二氧化碳甲烷化固定床反應器之數值分析
Numerical analysis of CO2 methanation in fixed-bed reactors
指導教授： 許文震
Sheu, Wen-Jenn
口試委員: 王訓忠
Wong, Shwin-Chung
陳炎洲
Chen, Yen-Cho
學位類別： 碩士
Master
系所名稱： 工學院 - 動力機械工程學系
Department of Power Mechanical Engineering
論文出版年： 2018
畢業學年度： 106
語文別： 中文
論文頁數： 58
中文關鍵詞： 二氧化碳 、甲烷化 、數值分析 、固定床 、管狀反應器
外文關鍵詞： Methanation, Carbon-dioxide, Fix-bed, Numerical, Tubular reactor
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    • 為因應全球暖化議題，二氧化碳之捕獲與回收再利用成為一具潛力之研究項目，本文旨在利用COMSOL軟體，以數值分析方式針對CO2甲烷化反應器做性能之探討。本文主要可分為兩個部分：(1)針對既有管狀CO2甲烷化反應器之實驗結果做模擬驗證，並進一步調整不同參數，探討溫度、觸媒量、入口成分比例等參數變化對於反應器性能之影響。(2)提出一種新式的反應器設計，在原有管狀反應器基礎結構上添加熱回收機制，並以數值分析方式，將其與原有之管狀反應器，在相同參數設定下，做性能比較。結果顯示：(1) 將操作溫度控制在300℃左右，流量低於3ml/s，H2/CO2大於4，適當增加觸媒填充量(高於入口CO2之莫爾數)，配合水氣轉移反應器的添加移除水蒸氣，可使反應器的反應條件達到最佳化。(2)熱回收機制的添加能有效優化原有反應器之性能，主要成果反映在均勻的熱分布能讓反應器在具有熱損耗之現實操作情況，不同參數調整所帶來之不利影響下，同樣保持著高甲烷化轉換效率。

    For the issue of global warming, the capture and utilization of carbon dioxide have significant potential in the research aspect of power generation. In this work, we use the COMSOL software to analyze numerically on performance of CO2 methanation reactor. This work can be divided into two main parts as follows. (1) We use the numerical method to verify the results from experiment of tubular CO2 methanator, furthermore; we investigate the effects of adjusting parameters such as operating temperature, catalyst loading, and consistent of inlet on performance. (2) We propose a new design of reactor- combine the reactor with heat recovery. Then we study on the relevant improvement which is compared with original geometry by numerical method. The results show that (1) To optimize the function of reactor, we need to control the operating temperature around 300℃, the volume flow rate lower than 3ml/s, H2/CO2 ratio higher than 4, appropriately increasing the catalyst loading and the water gas shift mechanism. (2) Considering the heat loss for the real situation in life, because of the even distribution of heat, the CO2 methanator with heat recovery can effectively improve the CO2 conversion and maintain a high efficiency under unfavorable conditions.

    摘要 2 第一章 緒論 6 1.1 前言 6 1.2 文獻回顧 9 1.3 研究目的 13 第二章 反應器 14 2.1 管狀CO2甲烷化反應器 14 2.2 熱回收型CO2甲烷化反應器 15 第三章 數學模式與數值方法 16 3.1 物理說明與基本假設 16 3.2 統御方程式 17 3.2.1 質量守恆方程式 17 3.2.2 動量方程式 17 3.2.3 能量方程式 18 3.2.4 物質方程式 19 3.3化學反應 20 3.3.1 CO_2甲烷化反應模式 20 3.4邊界條件 22 3.5數值方法 24 第四章 研究結果與討論 25 4.1 管狀甲烷化反應器 25 4.2 添加熱回收機制對反應器之效益 31 4.2.1管壁材質變化之效應 32 4.2.2管長變化之效應 46 4.2.3觸媒量變化之效應 48 4.2.4入口水氣比例變化之效應 50 4.3結論 52 第五章 未來展望與後續工作 54 參考文獻 55

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