Experimental and Kinetic Study of Laminar Burning Velocities for NH 3 /CH 4 /O 2 /NO/CO 2 Premixed Flames

Zuochao Yu, Yong He (), Junjie Jiang, Wubin Weng, Siyu Liu, Shixing Wang and Zhihua Wang
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Zuochao Yu: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Yong He: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Junjie Jiang: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Wubin Weng: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Siyu Liu: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Shixing Wang: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Zhihua Wang: State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Energies, 2025, vol. 18, issue 18, 1-15

Abstract: Ammonia, as a promising carbon-neutral fuel, has attracted growing attention for blended combustion applications from academia to industry. Low-NO x -combustion strategies such as staged combustion, oxygen-enriched combustion, and exhaust gas recirculation may lead to ammonia combustion in CO 2 -rich and NO-rich environments. In this work, the laminar burning velocities ( S L ) in NH 3 /CH 4 /O 2 /NO/CO 2 flames with various ammonia blended ratios under atmospheric pressure were investigated using the heat flux method. The addition of NO to the oxidizer significantly enhances S L , with the enhancement factor ξ proportional to the NO fraction in the oxidizer and strongly dependent on the fuel composition. Chemical effects rather than thermal-diffusion effects dominate the enhancement of S L . Kinetic analysis shows that NO actively participates in the reaction network during the early flame stage, promoting the formation of key radicals such as H and OH through pathways like NH 2 + NO = NNH + OH and NNH = N 2 + H, thereby accelerating chain-branching and sustaining flame propagation.

Keywords: ammonia; heat flux method; laminar burning velocity; CO 2 dilution; NO addition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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