本研究之目的在於利用理論分析工業爐單燒和混燒高爐氣的熱能轉換特性，以作為實務上單燒高爐氣之參考依據，進而評估其操作條件與時機。首先探討燃料使用量、化學計量空氣需求量、絕熱火焰溫度、煙道氣排放量等四項重要參數對製程氣燃燒特性的影響，接著分析單燒和混燒高爐氣之加熱能力比。結果得到：在化學計量比且無預熱條件下，單燒高爐氣時需要大量的燃氣才可達到預定產熱；以高熱值燃氣混燒高爐氣，則燃氣量會因而減少，但燃燒空氣卻會因此增加，而絕熱火焰溫度與加熱能力比均會隨之上升。在固定製程氣混燒比例之條件下，當爐壁溫度越高，則混燒系統對爐壁之加熱能力比越低。當單燒高爐氣時，煙道氣富含進氣時高爐氣本身的不可燃氣，故其體積流率高；若混燒高爐氣，煙道氣體積流率會隨高爐氣的減少而降低。此外，最後更進一步探討增加10%的過剩空氣和0.1MW的預熱條件下，對製程氣混燒後之燃燒特性與加熱能力比的影響。
其次，本研究亦利用空氣-乙烯對沖流擴散火焰進行燃燒合成碳米碳管的實驗分析，探討溫度場、沉積位置與硝酸鎳濃度等三項參數，對於火焰合成奈米碳管的影響。結果發現火焰面溫度過高，易使金屬觸媒與火焰區內的不飽和自由基反應變成碳-金屬合金；反之，遠離火焰面溫度過低，會使觸媒失去活性而得到碳煙。在相同的徑向位置中，沿著火焰面往燃料端軸向移動，熱解離產生的不飽和自由基濃度變化為由少變多再變少，故奈米碳管生成變化為由無變有再變無。在鎳網格塗佈硝酸鎳條件下，可以增加碳管管長與生成量。

BFG is blast furnace gas, which is a fuel gas produced in quantities in the steelmaking process. For effective use of this BFG, it is significant to develop the technology of firing BFG individually without the support fuel, such as natural gas (NG) and heavy oil. However, as compared with the fuel of BFG in combination with coke oven gas (COG) or NG, BFG is low in calorie because of high rate of inert gas such as nitrogen and carbon dioxide. Owing to this special fuel condition, many technical problems, such as slow burning velocity and flame stability, remain to be solved in using BFG individually as the fuel for hot gas stoves and boilers. The combustion characteristics of firing BFG, individually or in combination with COG or NG, including fuel gas volume flow rate, air volume flow rate, adiabatic flame temperature, flue gas composition, and thermal efficiency were analyzed.
Results show that under the operating conditions of stoichiometry and without preheat at the same heat release rate, the fuel gas volume flow rate of firing BFG individually is greater than that of firing BFG with support fuel. The smaller air volume flow rate, the lower adiabatic flame temperature and the lower thermal efficiency of the former are found for the former as compared with the latter. However, the volume flow rate of flue gas for the former is greater than the latter because it contains a large amount of inert gases in the flue gas. Additionally, the combustion characteristics of firing BFG, individually or in combination with COG or NG were also discussed under the operating conditions of adding ten percent excess air and/or 0.1MW preheat.
Moreover, the synthesis of carbon nanotubes (CNTs) on a catalytic nickel substrate in counter-flow diffusion flames was investigated experimentally. The effects of sampling positions, gas temperature distributions and the concentration of nickel nitrate on the synthesis of CNTs were examined. Curved and entangled tubular multi-walled CNTs are harvested, which have both typical straight tubular and bamboo-like structures. Besides curved CNTs, helically coiled tubular CNTs are also synthesized.
Because of the flame surface with high temperature, the metal catalyst can easily react with the unsaturated free radical in the flame zone to form the carbon-metal alloy; whereas, the metal catalyst can lose its activity and obtain the soot in the position away from the flame surface in which the gas temperature is low. In the same radial position, the variation of the yield of CNTs is from no CNTs to agglomeration and then no CNTs. This is because the sample position moves along a vertical line from the flame surface to the upper burner corresponding to the concentration of unsaturated free radical from rare to dense and then rare. Using a Ni(NO3)2-coated substrate has advantages over uncoated Ni substrates, which can increase the length and the quantity of CNTs.

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