Coupling effects of hydrogen transport and reactivity on NO production in laminar nonpremixed methane/air flames

•Fabricating fuel was conducted to study hydrogen effect on NO production.•Hydrogen enrichment showed little transport effect on peak [NO].•Species diffusion is the dominated behavior of hydrogen transport.•Total NO production was effected by hydrogen diffusion and reaction promotion. A computationa...

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Bibliographic Details
Published in:Fuel (Guildford) 2021-03, Vol.288, p.119725, Article 119725
Main Authors: Liang, Mengqing, He, Yituan, Liao, Shiyong, Jian, Xiaochun, Shao, Yiming
Format: Article
Language:English
Subjects:
Comparative analysis
Computer applications
Convection
Counterflow
Coupling
Diffusion
Enrichment
Hydrogen
Hydrogen enrichment
Hydrogen reactivity
Hydrogen-based energy
Methane
Nitric oxide
Nonpremixed flame
Nonpremixed flames
Physical transport
Reactivity
Route selection
Transport properties
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Summary:•Fabricating fuel was conducted to study hydrogen effect on NO production.•Hydrogen enrichment showed little transport effect on peak [NO].•Species diffusion is the dominated behavior of hydrogen transport.•Total NO production was effected by hydrogen diffusion and reaction promotion. A computational simulation of counterflow nonpremixed flame was performed to study the effects of hydrogen enrichment on NO chemistry on the basis of the methodology of fabricating hydrogen enrichment. Normal hydrogen and the fictitious hydrogen enrichment with weakened transport properties were both introduced into flame modeling and the comparative analysis was implemented to explore the coupling effects of the physical transport and reactivity of hydrogen enrichment on NO production. The study focused on the variations in NO peak concentration and the total production rate of NO versus hydrogen enrichment rate. The contributions and sensitivities of key reactions to NO production were estimated to determine the influencing routes of hydrogen enrichment on NO chemistry. The flame structures were compared in terms of the convection, conduction, diffusion and reaction in flame energy and hydrogen species conservations. The coupling interaction between hydrogen diffusion and the reaction promotion caused by hydrogen diffusion is the dominant kinetic incentive of hydrogen enrichment on NO production in nonpremixed methane/air flames.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2020.119725