碩士生: 林伯鴻
畢業年月: 2022年8月
論文名稱: 氫氣對乙烯/空氣/氮氣反擴散火焰之熱釋放區與煙粒產生之效應 / Effects of hydrogen addition on the heat release zone and soot generation of ethylene/air/nitrogen inversed-diffusion flames
中文摘要:
不完全燃燒產生的煙煤危害人體健康並加劇暖化。本研究探討氫氣添加對三環逆擴散火焰（氧化劑為33%氧氣與67%氮氣）煙煤生成與預熱區分布的影響。實驗以雷射誘導白熾光（LII）量測煙煤濃度，以平面雷射誘導螢光（PLIF）量測甲醛（CH2O）分布，並以增強型相機擷取C2*與CH*化學發光訊號。在氧化劑流量固定下，氫氣體積比由0%增至20%。結果顯示氫氣增加使CH*與C2*發光強度下降，顯示煙煤抑制與火焰預熱區變化有關；氫氣20%時LII訊號下降60.6%，且煙煤與甲醛分布高度相關，暗示甲醛化學在抑制機制中扮演關鍵角色。
英文摘要:
Soot from incomplete combustion harms health and contributes to warming. This thesis explores how hydrogen enrichment affects soot formation and the preheat zone in a tri-annular inverse diffusion flame whose oxidizer is 33% O2 and 67% N2. Laser-induced incandescence (LII) measures soot concentration, planar laser-induced fluorescence (PLIF) maps formaldehyde (CH2O), and an intensified camera records C2* and CH* chemiluminescence. Hydrogen is varied from 0% to 20% by volume at a constant oxidizer flow rate. Adding hydrogen lowers CH* and C2* intensities, linking soot suppression to changes in the preheat zone, and the LII signal falls by 60.6% at 20% hydrogen. Soot and CH2O distributions are strongly correlated, suggesting formaldehyde chemistry plays a key role in soot suppression.
