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Study of the chemical effect of steam dilution on NO formation in laminar premixed H2/Air flame at normal and elevated pressure

Lookup NU author(s): Dr Andrew AspdenORCiD

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

To promote the understanding and development of the steam diluted H 2 /air combustiontechnology, the chemical effect of steam dilution on NO formation in 1D laminar premixedH 2 /air flame is numerically studied over a wide range of conditions. The importance and theinfluence path of the chemical effect of steam dilution are analyzed, and the impact ofworking conditions is explored. This research makes up for the deficiencies in understandingthe chemical effect of steam dilution, and has significant reference value for optimizingworking conditions in practical application. Results show that the importance of steamdilution’s chemical effect on NO formation highly depends on the dilution rate and pressure.In this study, the chemical effect of steam accounts for -16.3% to 20.1% of the total NOreduced by steam dilution. The direct chemical effect of steam is the main cause of NOchange. It reduces the H and O concentration by inhibiting the reaction OH+H 2 <=> H+H 2 Oand H+O 2 <=> OH+O. However, the third-body effect of steam increases the O concentrationand then slightly promotes NO formation. Increasing pressure causes the direct chemicaleffect to gradually turns to promote the NO generation at low dilution rates.29 Keywords: H 2 flame, Steam dilution, Chemical effect, NO formation


Publication metadata

Author(s): Lyu Y, Aspden AJ, Zhang L, Liu L, Qiu P

Publication type: Article

Publication status: Published

Journal: International Journal of Hydrogen Energy

Year: 2021

Volume: 46

Issue: 24

Pages: 13402-13412

Print publication date: 06/04/2021

Online publication date: 18/02/2021

Acceptance date: 21/01/2021

Date deposited: 28/02/2021

ISSN (print): 0360-3199

ISSN (electronic): 1879-3487

Publisher: Elsevier

URL: https://doi.org/10.1016/j.ijhydene.2021.01.133

DOI: 10.1016/j.ijhydene.2021.01.133


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Funding

Funder referenceFunder name
National Natural Science Foundation of China (Grant No. 51976048)

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