研究生: |
黃紀維 Huang, Chi-Wei |
---|---|
論文名稱: |
氫於多孔性介質燃燒室應用在觸媒煆燒之研究 Studies on a Porous Media Burner with Hydrogen for Catalyst Calcination |
指導教授: |
賴維祥
Lai, Wei-Hsiang |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics |
論文出版年: | 2011 |
畢業學年度: | 99 |
語文別: | 中文 |
論文頁數: | 129 |
中文關鍵詞: | 氫燃燒 、穩駐火焰 、多孔性介質燃燒室(PMB) 、觸媒煆燒 、碳化矽多孔材 、堇青石 |
外文關鍵詞: | Hydrogen combustion, Holding flame, Porous Media Burner (PMB), Catalyst calcination, SiC porous medium, Cordierite |
相關次數: | 點閱:153 下載:1 |
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本研究以自主建立之多孔性介質燃燒室(PMB),在適當參數條件、操作流程、控制邏輯與多孔性介質配置之下,可在燃燒段提供一穩駐供熱之火焰面,藉此可準確地將燃燒段特定區域之溫度控制於650 oC且持溫四小時,遂將以此溫度場應用於煆燒觸媒,再以相同升溫與持溫條件,使用高溫爐(Oven)進行觸媒煆燒,最後配合物性與化性分析進行比較。
由PMB進行觸媒煆燒實驗之結果得知,煆燒區溫度在平均25-30分鐘即可達到持溫650 oC的設定值,持溫過程中煆燒區可保持650 oC ± 3 oC以內,比較Sample 1 ~ 3之升溫與持溫曲線,可得知升溫越快,會造成煆燒區溫度越不均勻,但此趨勢並不影響持溫的穩定性。此外,在煆燒實驗中PMB與高溫爐之升溫及持溫曲線做比較,持溫曲線幾乎是重合的。
由此兩種煆燒製程後之觸媒置入重組器中,由部分氧化法(POX)進行實驗之結果可得知:隨著O2/C比的增加,Sample 2和Sample Oven之甲烷轉化率相當,且各重組氣體濃度比在0.94~1.10之間,沒有顯著的差異性;物性分析方面,表面形態與成分分析之差異性不大,且孔徑大小、比表面積值、等溫氣體吸脫附曲線等性質,Sample 2與Sample Oven之結果幾乎一致。
綜合以上,由實驗結果可得知PMB煆燒區之溫度場可應用在觸媒煆燒,為一可行之製程,應可進一步應用。
In this research, hydrogen is taken as fuel along the investigation of the combustion of a self-designed porous media burner(PMB). With appropriate operational parameters, operational processes, control logic, assembly of porous media and hydrogen concentration, it can provide a stable flame temperature at 650 oC for four hours to calcine the catalyst. Moreover, an oven was used to calcine catalyst at identical conditions for comparison by both physical and chemical properties analysis.
In catalyst calcination experiments, the hydrogen concentration was 12 %. It took 25 to 30 minutes in average to reach the holding temperature of 650oC, and maintained at 650±3oC. In addition, it can be seen that the temperature uniformity in the calcinations zone decreased with increasing the heating speed. However, the heating speed does not affect the stability of calcination temperature. From this work, it can also be seen that raising and holding temperature curve of a PMB and that of an oven are almost identical.
In the chemical properties analysis, the catalyst was placed in a reforming chamber. It can be seen that the methane conversion ratio of Sample 2 and Sample-oven were similar when increasing the O2/C ratio , and concentration ratios of a PMB and of an oven were in the range of 0.94 and 1.10. On the other hand, the results of the physical properties analysis showed that the surface morphologies and the composition of the PMB-calcined catalyst, and of the oven-calcined catalyst were similar after they were treated under partial oxidation(POX). In addition, catalyst pore sizes, BET values, physisorption isotherms and other properties were almost identical for Sample 2 and Sample-oven.
Results show that a porous media burner can provide a stable temperature at 650oC for four hours in the calcination zone to calcine the catalyst successfully.
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