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研究生:劉俊賢
研究生(外文):Jyun-SianLiou
論文名稱:二氧化碳稀釋富氧甲烷擴散火焰之數值研究
論文名稱(外文):A Numerical Study of Effects of Carbon-Dioxide Dilution on the Oxy-Fuel Methane Diffusion Flames
指導教授:趙怡欽
指導教授(外文):Yei-Chin Chao
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:2010
畢業學年度:98
語文別:中文
論文頁數:76
中文關鍵詞:富氧燃燒二氧化碳稀釋擴散火焰數值模擬甲烷二氧化碳
外文關鍵詞:Oxy-fuelCarbon-Dioxide DilutionDiffusion FlamesNumericalNumerical SimulationCarbon-Dioxide
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本文以實驗搭配數值模擬研究二氧化碳或氮氣稀釋氧氣為併流(co-flow)之富氧甲烷擴散火焰之燃燒特性。由於二氧化碳稀釋富氧甲烷燃燒系統可達到無氮燃燒,且可回收高濃度之二氧化碳做後續二氧化碳之高效率捕抓(capture)與有效封存(sequestration),此燃燒系統所有燃燒後的氣體幾乎都可被回收,對於降低環境汙染與降低溫室效應有相當大的幫助。以純氧燃燒將造成相當高溫的火焰,所以實務尚需要回流部分含二氧化碳的煙道氣(flue gas)作為火焰降溫稀釋之用,但由於回流稀釋量太多會造成火燄不穩定,稀釋量太低氧氣濃度高卻容易造成局部高溫,對燃燒室設計相當不利,且高溫對於燃燒室材料選用會變得極為困難,成本也隨之提高。
由模擬結果得知,當甲烷擴散燃燒時,周圍的併流場會捲入燃料底部,造成部分預混的效果,使得火焰提早獲得氧氣而提前反應,火焰長度進而變短,當氧氣濃度提高時,燃燒速度變快,火焰變得更為短小,溫度也跟著提升,高溫時的二氧化碳Cp值為氮氣的1.67倍,高吸熱效果會使整體火焰溫度降低、火焰速度降低,反應變得比氮氣時更加延緩,OH量減少且有延後的情況發生,不完全的燃燒使得CO量變多。

In this paper, experiments with a numerical simulation of oxygen to carbon dioxide or nitrogen dilution and flow (co-flow) of the oxygen-enriched combustion characteristics of methane diffusion flame. Dilution of oxygen-enriched combustion of methane as carbon dioxide to nitrogen-free combustion system, and the high concentration of carbon dioxide recycled to do the follow-up of carbon dioxide efficient catch them (capture) and the effective storage (sequestration), the combustion system almost all the combustion gases can be be recycled, for reducing environmental pollution and reduce greenhouse there is a big help. To pure oxygen combustion will result in considerable heat in the flame, so still need to return part of the practice of carbon dioxide containing flue gas (flue gas) used as flame cooling diluted, but dilution of the amount returned will cause too much instability in the flame, the amount is too dilute Low oxygen concentrations are likely to cause high local temperature on the combustion chamber design of considerable disadvantage, and high-temperature materials used for the combustion chamber will become extremely difficult, cost will increase.
From the simulation results, when the diffusion combustion of methane, and the flow field around the bottom will get involved in the fuel, resulting in some of the effects of premixed, the flame of oxygen and the early response of early, flame length and then shortened, when the oxygen concentration increases, combustion speed becomes faster, the flame becomes more short, temperature increase with high temperature when the nitrogen dioxide Cp value of 1.67 times, the high endothermic effect will reduce overall flame temperature, flame speed reduces the reaction time becomes more than the nitrogen delay, OH reduced to happen and there is delayed, incomplete combustion of CO made more quantitative.

摘要 I
Abstract III
致謝 V
表目錄 VIII
圖目錄 IX
符號表 XII
第一章 緒論 1
第二章 文獻回顧與動機目的 4
2-1 富氧燃燒 4
2-2 文獻回顧 5
2-3 研究動機與目的 6
第三章 實驗方法 7
3-1 實驗設備 7
3-2 燃料與空氣供應設備 8
3-3 操作方法 8
第四章 數值方法 10
4-1 軟體使用 10
4-2 基本假設 11
4-3 統御方程式 11
4-4 SIMPLEC 13
4-5 有限體積法 17
4-6 格點獨立性測試 19
4-7 邊界條件 20
4-8化學反應 21
第五章 結果與討論 23
5-1 外圍併流氣體對於擴散火焰長度及火焰溫度的影響 23
5-2 氧氣濃度對於火焰長度及火焰溫度的影響 25
5-3 氮氣與二氧化碳對於富氧火焰溫度之影響 26
5-4 氮氣與二氧化碳對於富氧火焰OH之影響 27
5-5 氮氣與二氧化碳對於富氧火焰CO之影響 27
第六章 結論 29
參考文獻 30
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