摘要
題目：混合燃料燃燒特性之研究
研究生：田俊宏
指導教授：趙怡欽
多重成份燃料在未來當成能量的來源是一種相當有潛力的方式，直到現在，多重成份燃料之燃燒特性包括燃燒速度、以及成份間之互相影響機制仍然不清楚，尤其以低熱值燃料、氣化煤氣、氣化生質能等燃料為主的多重成份燃料。目前大部份燃燒研究針對單一燃料為主並詳細探討各種單一燃料之燃燒特性與燃燒機構之研究相當完備，而對低熱值多重成份氣態組合燃料的燃燒現象而言，其燃燒特性與反應機制是無法使用各種不同單一燃料的燃燒特性與反應機制直接加成，在有限現有研究明顯指出混合燃料與單一燃料明顯不同，適當調和可以比各單一燃料高出數倍燃燒效果，尤其是影響燃燒效率與燃燒室設計的燃燒速度與吹熄穩定極限等。
因此，在本研究中使用甲烷與一氧化碳混合氣體之探討做為一系列混合燃料研究的開始。混合燃料以人工方式調配並且利用對衝流火焰燃燒器加以燃燒，而且利用實驗法與數值模擬探討火焰外觀、燃燒速度，與燃料之可燃極限。在數值模擬部份，利用Chemkin 3.7搭配GRI 3.0反應機構所得之資料與實驗結果互相比對。除此之外，更利用靈敏度分析來探討燃燒中之主導機制。
結果顯示當燃料中甲烷的成分為10%時火焰的燃燒速度可以達到最大值，根據靈敏度分析的結果顯示當甲烷成分介於10%-100%時燃燒反應主要由甲烷控制，相反的當甲烷成分小於10%時反應主導機制由一氧化碳控制。

Abstract
Subject：A study of Combustion Characteristics for Blended Fuels
Student：Chun-Hung Tien
Adviser : Yei-Chin Chao

It will be a potential method to apply the fuels with multi-compositions as the energy source in future. Up to now, the combustion characteristics, mechanisms, and mutual interaction between species are still unclear especially for low-calorific fuels, gasified coal, gasified biomass and etc…In the past, research and efforts are mostly invested on combustion characteristics and reaction mechanisms of single component of high-grade fuels. From the limited research reports, it is clearly shown that the combustion behaviors and reaction mechanisms for the blended fuels is usually completely different from each component and can not be estimated by simple summation based on the proportion and the major combustor design parameters such as the flame velocity and the lean blowout limits can be enhanced by several folds by proper blending proportion.
Hence, the study of mutual interaction between fuels started with the binary mixture of methane and carbon monoxide. The fuels blended artificially and burned with a counterflow burner. A series of experimental method and simulation are performed to delineate the flame characteristics including qualitative flame appearances, burning velocity, flammable limits. In simulation, the data calculated by Chemkin 3.7 with GRI 3.0 mechanisms are compared with experimental results. In addition, sensitively analyses are also performed to verify the dominated reaction mechanisms.
The results show that when the concentration of methane in CO-CH4 mixture fuels is increased to 10%, the burning velocity increased to a maximum value. According to the results of sensitivity analysis, the combustion dominated by methane when the concentration of methane is lies between 10% and 100%. Conversely, the reaction mechanism is dominated by CO when the concentration of methane less than 10%.

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