熱輻射對多孔性介質爐中氫、甲烷燃燒之影響

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許文振(Wen-Chen Hsu) 查詢紙本館藏

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機械工程學系

論文名稱

熱輻射對多孔性介質爐中氫、甲烷燃燒之影響
(Effects of Thermal Radiation on Methane/Hydrogen Combustion in Porous Medium Burner)

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摘要(中)

本文以實驗方法與數值模擬探討氫氣、甲烷在多孔性介質燃燒爐中的燃燒現象。實驗依多孔性陶瓷介質排列方式及間隙的有無分為四種爐體，以LabView程式配合資料擷取卡控制各氣體流量、量測火焰溫度、速度與污染物的排放量，而數值模擬則利用熱流計算軟體STAR-CD以二維圓柱座標建構多孔性陶瓷介質燃燒爐，另外加入額外的副程式，以離散座標法來求解輻射熱傳方程式。
文中探討甲烷、氫氣及空氣混合氫在多孔性介質爐中之燃燒現象。討論爐體結構、當量比、流速、氫氣莫爾分率的改變對火焰造成的影響，並探討一氧化碳及氮氧化物對以上各參數之影響；在數值模擬方面以爐體B為爐體模型，進一步探討熱傳導係數、對流熱傳係數、光學厚度、散射比等的改變對燃燒現象之影響。
爐體以三明治結構表現的效能最好，可燃範圍相當寬廣，貧油極限可至當量比0.3以下；間隙的存在會改變火焰穩定的狀態，對爐體D而言，同一火焰速度可存在兩不同的穩定位置；添加氫氣對火焰溫度無明顯變化，但可增加火焰速度，約為自由火焰的6至9倍；對流熱傳係數及氫氣莫爾分率增加會使火焰位置往上游移動；光學厚度增加及散射比接近0.35時，氣體溫度曲線會下降。

摘要(英)

The lean combustion of hydrogen/methane mixtures within a highly porous medium has been investigated by experiment and numerical simulation. According to the ceramics arrangement and the gap, four burner structures are built. we use the LabView program to measure the flow rates, flame temperature, the NOx/CO emission. for the numerical simulation. we use STAR-CD to build a model and to compute the solution.
results show that for burners without a gap, the flame tends to stabilize at the upstream half. for the burners with a gap, the flame can stabilized in either the upstream half ot the downstreams one. Using small-pore ceramics blocks at the inlet and exit can cut radiative heat loss and lower the lean limit. Addition of hydrogen in the fuel doesn’’t change the flame temperature greatly. the flame speed, however, increases with the hydrogen fraction in the fuel.

關鍵字(中)

★ 多孔性介質
★ 燃燒
★ 熱輻射
★ 氫氣

關鍵字(英)

★ hydrogen
★ porous medium
★ combustion
★ radiation

論文目次

摘要 ………………………………………………i
誌謝 ………………………………………………ii
目錄 ………………………………………………iii
表目錄 ……………………………………………vi
圖目錄 ……………………………………………vi
符號表 ………………………………………………x
第一章緒論 ………………………………………………1
1.1 簡介……………………………………………1
1.2 文獻回顧………………………………………3
1.3 本文研究方向…………………………………9
第二章理論分析………………………………………11
2.1 基本假設……………………………………11
2.2 統御方程式…………………………………12
2.3 邊界條件……………………………………14
2.4 名詞定義……………………………………15
2.5 輻射熱傳方程式……………………………16
第三章實驗架構與流程………………………………19
3.1 實驗架設……………………………………19
3.2 實驗流程……………………………………22
第四章數值方法………………………………………24
4.1 爐體模型與格點系統………………………24
4.2 模擬燃燒的方法……………………………24
4.3 解題方法……………………………………25
第五章實驗之結果與討論…………………………26
5.1 爐體結構之比較……………………………26
5.2 加入氫氣對燃燒現象之影響………………30
5.3 改變各參數對有間隙爐體之燃燒現象的影響
…………………………31
5.4 污染物的排放…………………………33
第六章數值模型之比較與討論………………35
6.1 火焰速度與當量比…………………………35
6.2 熱傳導係數與對流熱傳係數………………36
6.3 氫氣…………………………………………36
6.4 輻射特性……………………………………37
第七章結論……………………………………………38
7.1 結論…………………………………………38
參考文獻 …………………………………………………63
附錄一誤差分析……………………………………69

參考文獻

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指導教授

曾重仁(Chung-Jan Tseng)

審核日期

2002-7-12

推文