本研究探討氫氣擴散火焰於多孔性介質燃燒室中之特性，並利用其特性進行逆水氣轉移反應之可行性研究。實驗參數包括多孔性介質堆疊塊數(1~4塊)、孔徑大小(15、30PPI)、燃氣進氣流率(3~8 L/min)、當量比(0.25~2)、H2/CO2比(1、3、5)。量測參數為燃燒室的軸向溫度分佈、多孔性介質介面的徑向溫度分佈以及二氧化碳轉化率，並且以影像觀測燃燒室中火焰面，了解多孔介質對火焰的影響。由實驗結果得知，擴散火焰較預混火焰有更廣泛的燃氣操作範圍。在本研究設定的當量比範圍內(當量比=0.25~2)，進料的條件越貧油，燃燒室整體的溫度分佈越高。然而當空氣進氣流率固定時，改變氫氣進氣流率對燃燒室整體溫度無顯著之影響。在逆水氣轉移的實驗中，降低氫氣進氣流率，提高H2/CO2比與當量比能提高二氧化碳之轉化率。在參數H2=4 L/min、H2/CO2=5有最高的二氧化碳轉化率(31.6%)。氫氣擴散火焰於多孔性介質之燃燒特性值得更進一步的研究，期望能更深入了解擴散火焰與多孔性介質之間互相影響的關係，並將其廣泛的應用於現有的燃燒系統中。

This research investigates the characteristic of hydrogen diffusion flame and the practicability of the reverse water gas shift reaction in the porous media burner. Experimental parameters included the flow rate of the fuel (3~8 L/min), equivalence ratio (0.25~2), stacked number (1~4 piece), the pore size of the porous media (15, 30 PPI), and the H2/CO2 ratio (1, 3, 5). The measurements of the temperature variation of axial direction of burner and the radial direction of the interface between two porous media, the CO2 conversion efficiency were carried out. Moreover, the flame front in the porous media burner was observed to understand the influence of porous media on the flame characteristic. It was found that the operable range of the hydrogen diffusion flame in the porous media burner was larger than that of the premixed flame. The temperature becomes higher when the equivalence ratio (0.25~2) was more close to the lean-burn conditions. However, effects of hydrogen flow rate were not significant when the air flow rate was fixed. From the test of the reverse water gas shift reaction, decreasing the hydrogen flow rate or increasing the H2/CO2 ratio and the equivalence ratio increased the CO2 conversion efficiency. The highest CO2 conversion efficiency was 31.6% when hydrogen flow rate was 4 L/min and H2/CO2 ratio was 5. The result shows that it can be found at some particular conditions of the hydrogen diffusion flame with porous media burner, but it needs to be further studied in order to apply it to a present combustion system.

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