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Study on N2O production mechanisms of lean ammonia/hydrogen/air premixed laminar flames

Hayakawa, Akihiro, Hayashi, Masao, Kovaleva, Marina, Gotama, Gabriel Jeremy, Okafor, Ekenechukwu Chijioke, Colson, Sophie Valerie Anne, Mashruk, Syed, Valera Medina, Agustin, Kudo, Taku and Kobayashi, Hideaki 2021. Study on N2O production mechanisms of lean ammonia/hydrogen/air premixed laminar flames. Presented at: The 59th Japanese Symposium on Combustion, Virtual, 22nd - 24 November 2021.

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Abstract

Application of ammonia as fuel is a potential candidate to achieve carbon neutrality. As laminar burning velocity of ammonia is slow, hydrogen addition is also considered to improve combustion characteristics with no carbon emission. In this study, we experimentally investigated product gas characteristics of strain stabilized ammonia/hydrogen/air premixed laminar flames under atmospheric pressure for various equivalence ratios. In a lean condition, large amount of N2O production was observed. To clarify N2O production mechanisms, numerical simulations were conducted using a reaction mechanism developed by Gotama et al. In the Gotama reaction mechanism, major N2O production path was NH+NO=N2O+H and major N2O consumption paths were N2O+H=N2+OH and N2O(+M)=N2+O(+M). It was clarified that a decrease in N2O consumption via N2O(+M)=N2+O(+M) increases N2O emission for lean and strained conditions.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: In Press
Schools: Engineering
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Date of First Compliant Deposit: 20 January 2022
Date of Acceptance: 24 September 2021
Last Modified: 20 Jan 2022 11:48
URI: https://orca.cardiff.ac.uk/id/eprint/145629

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