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論文名稱(外文):Evaporation Research and Analysis of Different Fuels in Steam Reformer
外文關鍵詞:methanolmethanol-waterethanolhydrogenevaporatorsteam reformer
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本論文以數值模擬的方式探討不同燃料在重組器之蒸發器盤管的蒸發變化之研究分析。利用計算流體力學(Computational Fluid Dynamics,簡稱CFD)的數值分析,進行模擬研究及探討複雜的物理變化。本研究將對甲醇水比例分為甲醇占50%水為50%、甲醇占62%水為38%、甲醇占75%水為25%、甲醇占100%與乙醇占100%五種燃料在相同條件熱源和進料壓力條件下進行重組器之蒸發器盤管汽化模擬研究與分析。探討燃料於蒸發器盤管內部流場的速度、出口溫度、蒸發汽化的變化情形。
模擬結果顯示各燃料在常溫下之速度場呈現等速度狀態,而加入溫度場後,因燃料蒸發的變化,導致出口端速度呈現加速狀態。研究結果亦顯示燃料出口端的溫度甲醇水(50%:50%)為473K、甲醇水(62%:38%)為515K、甲醇水(75%:25%)為547K、甲醇(100%)為609 K與乙醇(100%)為713K,在蒸發器盤管內部的蒸發情形顯示,可以得知乙醇的蒸發速率優於其它四種燃料,其在進入盤管總長度為1300mm之距離入口端543mm處後達到完全汽化,而甲醇(100%)、甲醇水(75%:25%)、甲醇水(62%:38%)、甲醇水(50%:50%)則分別在距離盤管入口823mm、983mm、1023mm、1063mm處才完全達到汽化。根據文獻回顧得知燃料蒸發率越高,產氫效率也會提升,由此結果顯示出乙醇(100%)具有較高的產氫效率。而這些研究結果可作為設計蒸發器盤管之重要依據。

In this paper, the evaporation of different fuel in the evaporator coil of the reformer was studied by numerical simulation. Numerical analysis using computational fluid dynamics (CFD), conducted simulation studies and explored complex physical phenomenon. In this study, the ratio of methanol-water is 50% for methanol and 50% for water、62% for methanol and 38% for water、75% for methanol and 25% for water、100% of methanol、100% of ethanol. The vaporization simulation studies of five kinds of fuels under the same heat source and the same feed pressure. Discussing of velocity, outlet temperature and evaporative vaporization of different fuel in the evaporator coil were analyzed.
The simulation results show that the velocity field of the fuel at the normal temperature shows the same speed. After adding the temperature field, the velocity of the outlet is accelerated due to the change of evaporation. The results also shows that the temperature of the methanol-water (50%: 50%) at 473K, the methanol water (62%: 38%) at 515K, the methanol water (75%: 25%) at 547K and the methanol (100%) at 609 K and ethanol (100%) were at 713K. Evaporation in the evaporator shows that the evaporation rate of ethanol is superior to that of other fuels, ethanol in the coil length of 1300mm, 543mm away from the import end to achieve complete vaporization but methanol (100%), methanol-water (75%: 25%), methanol-water (62%: 38%) and methanol-water (50%: 50%) were at 823mm, 983mm, 1023mm, The vaporization fully achieved. The results of these studies can be used as an important basis for the design of evaporator coil.

摘要 VII
誌謝 IX
目錄 X
圖目錄 XII
表目錄 XIV
符號說明 XV
第一章 緒論 1
1.1前言導論 1
1.2產氫簡介 2
1.2.1電解水產氫 2
1.2.2生質能產氫 2
1.2.3石化能源產氫 2
1.3燃料電池簡介 3
1.4重組器簡介 5
1.5文獻回顧 7
1.6研究動機與目的 9
第二章 蒸發重組器系統各元件概述 11
2.1系統簡介 11
2.2系統主要元件 12
第三章 研究方法 15
3.1物理模型介紹 15
3.2基本假設 16
3.3 統御方程式 16
3.3.1 質量守恆方程式 16
3.3.2 動量守恆方程式 17
3.3.3 能量守恆方程式 17
3.3.4 雷諾數 17
3.4邊界條件 18
3.4.1蒸發器盤管入口與出口邊界條件 18
3.4.2 蒸發器盤管與流道 19
3.4.3 蒸發器盤管之邊界熱源 21
3.4.4 蒸發器盤管與燃料材料參數設定 24
第四章 數值方法 27
4.1 COMSOL Multiphysics模擬分析軟體介紹 27
4.2 有限元素簡介 28
4.2.1 網格建構 28
4.2.2有限元素法之分析程序 29
4.3 CFD計算流體力學介紹 29
4.3.1 單向流 29
4.3.2 非等溫流 30
4.4網格系統 30
4.5數值模擬流程 34
第五章 結果與討論 35
5.1 常溫下燃料於蒸發器盤管內速度場分析 35
5.2設定溫度下燃料在蒸發器盤管內的速度場分析 39
5.3不同燃料在蒸發器盤管內蒸發情形 43
5.4不同燃料在蒸發器盤管出口的反應溫度 47
第六章 結論與未來展望 50
6.1結論 50
6.2未來展望 50
參考文獻 51

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