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研究生:林牧融
研究生(外文):Mu-rong Lin
論文名稱:薄膜反應器之水氣轉移反應數值計算
論文名稱(外文):The simulation study on the water-gas shift reaction with a membrane reactor
指導教授:陳維新陳維新引用關係江滄柳
指導教授(外文):Wei-shin ChenTsung Leo Jiang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:航空太空工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:89
中文關鍵詞:薄膜反應器數值計算水氣轉移反應
外文關鍵詞:membrane reactorwater-gas shift reactionsimulation
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由於石油能源即將耗盡,提升產氫技術,並以氫能取代石油在能源應用之地位,是一迫切而重要之研究課題。煤炭氣化是一重要產氫方法,然而,其產生之氣化合成氣,除了含有高濃度之氫氣外,亦含有相當高濃度之一氧化碳。為了純化並提高氫氣濃度,可藉由適當之觸媒材料進行水氣轉化反應,將合成氣中部份之一氧化碳轉化成為氫氣。同時,若透過如鈀或鈀合金之氫氣分離薄膜,將轉化之氫氣抽離水氣轉化反應器,可將轉化程度提高至超越熱力學平衡反應之極限值。本研究建立一可完整分析薄膜反應器之水氣轉化反應之數值模式,其物理模式包括:高溫水氣轉化反應模式、低溫水氣轉化反應模式、觸媒多孔性介質流體傳輸模式及薄膜氫氣滲透模式等。本研究以此計算模式分析探討薄膜反應器對於水氣轉化反應之影響。
Coal gasification is one of the useful approaches for hydrogen production. However, the syngas of coal gasification contains not only a high concentration of hydrogen, but also a relatively high concentration of carbon monoxide. The carbon monoxide in syngas can be transformed to hydrogen by the water-gas shift reaction through appropriate catalyst, raising the content of hydrogen in the syngas. If a membrane reactor, using Pd or Pd alloy membrane to separate the produced hydrogen from the reactor, is used for the water-gas shift reaction, the total hydrogen produced will reach an amount higher than the thermodynamic-equilibrium limit allows. In the present study, a numerical model was developed for the water-gas shift reaction in a membrane reactor. The physical models include: the high-temperature water-gas shift reaction model, the low-temperature water-gas shift reaction model, the flow model in a catalytic porous medium and the model for hydrogen permeating through a membrane. The numerical model is applied to the analysis of the influence of a membrane reactor on the water-gas shift reaction.
摘要 I
Abstract II
致謝 III
目錄 IV
表目錄 VIII
圖目錄 IX
符號說明 XIII
第一章 緒論 1
1.1前言 1
1.2研究動機及目的 3
1.3本文架構 4
第二章 文獻回顧 5
2.1文獻回顧 5
2.1.1薄膜材料分析評估 5
2.1.2數值計算 9
2.1.3國內相關研究 12
第三章 研究方法 13
3.1物理問題及模式說明 13
3.2模型問題之基本假設 13
3.3統御方程式(Governing Equation) 14
3.3.1非觸媒區之統御方程式(Governing Equations of non-porous region) 14
3.3.2觸媒區之統御方程式(porous region) 16
3.4成份傳輸方程式(Species transport equation) 18
3.4.1水氣轉移反應 19
3.4.2化學反應速率 19
3.7氫氣滲透性問題 22
3.7.1氣體滲透性 22
3.8數值方法 23
3.8.1離散(Discretization) 24
3.8.2SIMPLE運算法則 24
3.8.3鬆弛係數 25
3.8.4收斂標準 26
第四章 結果與討論 27
4.1 網格獨立與實驗驗證 29
4.2水氣轉移反應與實驗數據比較分析 30
4.2.1高溫水氣轉移反應(HTSR) 34
4.2.2低溫水氣轉移反應(LTSR) 43
4.2.3 串聯高溫及低溫水氣轉移反應管 52
4.3結合薄膜反應器(MR)之觸媒水氣轉移反應(WGSR) 60
4.3.1薄膜反應器(MR)及高溫水氣轉移反應(HTSR)之數值模擬 62
4.3.2薄膜反應器(MR)及低溫水氣轉移反應(LTSR)之數值模擬 69
第五章 結論與未來工作 77
5.1結論 77
5.2未來工作 78
參考文獻 80
附錄A 86
附錄B 87
自述 89
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