碩士生: 黎明心
畢業年月: 2025年7月
論文名稱: 氨氣/空氣火焰與傾斜甲烷/空氣火焰交互作用之火焰行為與排放特性研究 / A study on flame behaviors and emissions of ammonia/air flames interacting with inclined methane/air flames
中文摘要:
氨（NH3）／甲烷（CH4）雙火焰燃燒可提升氨利用率並減少NOx，但兩道火焰各自的當量比如何影響穩焰與污染生成仍不清楚。本研究以具斜向側噴流的三縫燃燒器建立穩定、準二維且可光學觀測的火焰，可獨立控制CH4與NH3當量比。火焰影像顯示NH3火焰型態（開口、連續與綻放）受CH4火焰條件強烈影響：CH4越富燃，NH3反應速率越高、火焰越短、開口門檻越低；穩焰主要靠NH2*與CH*發光所見的自由基擴散與CH4傳輸。排放分析顯示NH3偏貧時，富燃CH4使NO與CO顯著下降，但過度富燃會經燃料NO路徑增加NO，CO—CO2關係則顯示涉及HCN的其他碳路徑。
英文摘要:
Ammonia (NH3)/methane (CH4) dual-flame combustion can improve ammonia use while limiting NOx, but how each flame's equivalence ratio affects stabilization and pollutants is poorly understood. This thesis uses a triple-slot burner with inclined side jets to make a stable, quasi-two-dimensional, optically accessible flame with independent control of the CH4 and NH3 equivalence ratios. Flame imaging shows NH3 flame behavior (tip-opening, continuous, and blooming regimes) is strongly influenced by the CH4 flame; richer CH4 raises NH3 reaction rates, shortens the flame, and lowers the tip-opening threshold. Radical diffusion (seen in NH2* and CH* chemiluminescence) and CH4 transport dominate stabilization. At lean NH3, NO and CO drop under rich CH4, but excessive enrichment promotes fuel-NO formation, and CO-CO2 trends suggest HCN-related carbon routes.
