The role of cyanides and isocyanides in emissions formation of laminar premixed ammonia/methane flames

Kovaleva, Marina ORCID: https://orcid.org/0000-0002-6516-3658, Hayakawa, Akihiro, Ekenechukwu C, Okafor, Yamashita, Hirofumi, Alnasif, Ali, Valera Medina, Agustin ORCID: https://orcid.org/0000-0003-1580-7133 and Crayford, Andrew ORCID: https://orcid.org/0000-0002-6921-4141 2023. The role of cyanides and isocyanides in emissions formation of laminar premixed ammonia/methane flames. Presented at: 61st Symposium (Japanese) on Combustion, Tokyo, 15 - 17 November 2023.

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Abstract

As an intermediate step towards a low-carbon economy, blending of ammonia and fossil fuels in combustion devices are of interest as a method of CO2 emissions reduction. However, compared to pure ammonia, NH3/CH4 blends produce higher peak NO emissions. C-N reactions have rarely been noted to be significant in most NOx emissions studies of NH3/CH4 blends and are excluded from many major ammonia mechanisms. This study uses emission data of NO, HCN, HNCO species in a one-dimensional, laminar, premixed burner-stabilized stagnation flame configuration to explore the contribution of these pathways to NO through the CEU-NH3 (Wang) mechanism. This study highlights that rarely included hydrocarbon-nitrogen interactions contributed to 12.4% of NO formation in rich, ammonia heat ratio of 20% blends of NH3/CH4. Despite this, reactions with the highest contribution to the O, H, OH radical pool remain the controlling factor for NO formation.

Item Type:	Conference or Workshop Item (Paper)
Status:	Unpublished
Schools:	Engineering
Subjects:	T Technology > TJ Mechanical engineering and machinery
Last Modified:	31 Jan 2025 16:45
URI:	https://orca.cardiff.ac.uk/id/eprint/175577

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