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Product gas analysis of laminar premixed ammonia-methane flames in stagnation flows

Kovaleva, Marina ORCID:, Hayakawa, Akihiro, Taku, Kudo and Hideaki, Kobayashi 2021. Product gas analysis of laminar premixed ammonia-methane flames in stagnation flows. Presented at: 38th International Symposium on Combustion, Adelaide, Australia, 24-29 January 2021.

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Ammonia is a promising hydrogen energy vector and a carbon-free fuel; hence the use of ammonia-hydrocarbon fuel blends can be viewed as an intermediate step towards a hydrogen economy. The characterization of methane-ammonia emissions is essential for designing combustors for a broader range of fuels while fulfilling strict NOx emission requirements and global warming targets. The product gas trends of laminar premixed ammonia-methane flames at atmospheric pressure were studied for 0.1 to 0.6 ammonia heat ratios at the operable range of equivalence ratios. Gases including NO, N2O, NO2, HCN, CO and NH3 were measured using the dual dilution gas method and compared against numerical predictions. Experimental results showed the highest NO emissions at approximately 8,000 ppm for the 0.3 and 0.4 ammonia heat ratios, reducing twofold at the extreme heat ratio conditions. The optimal condition for reducing NOx emissions while maintaining low unburnt NH3 was found to occur at a 1.20 equivalence ratio for higher ammonia ratios, moving incrementally closer towards 1.35 as the methane ratio was increased. These results can aid a further reaction model analysis due to the availability of stain stabilised stagnation flame models in numerical software.

Item Type: Conference or Workshop Item (Poster)
Status: In Press
Schools: Engineering
Date of Acceptance: 14 December 2020
Last Modified: 24 Jan 2021 03:05

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