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Numerical study assessing various ammonia/methane reaction models for use under gas turbine conditions

Xiao, Hua, Valera Medina, Agustin, Marsh, Richard and Bowen, Philip John 2017. Numerical study assessing various ammonia/methane reaction models for use under gas turbine conditions. Fuel 196 , pp. 344-351. 10.1016/j.fuel.2017.01.095

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Abstract

Ammonia as an alternative fuel and hydrogen carrier has received increased attention in recent years. To explore the potential of co-firing ammonia with methane for power generation, studies involving robust mathematical analyses is required to progress towards industrial implementation. To explore the chemical kinetic mechanisms best suited to ammonia/methane combustion in gas turbines, five different detailed mechanisms are compared to assess their efficacy in representing the reaction kinetics under practical gas turbine combustor operating conditions. Ignition delay time is compared with recently published predictions showing that the mechanisms of Tian and Teresa exhibit the best accuracy over a large range of conditions. A one-dimensional simulation was also conducted using a Chemical Reactor Network (CRN) model, thus providing a relatively quick estimation of the combustion mechanisms under swirling combustion conditions. The simulation of NOx emissions indicate that the Tian mechanism performs better than the others considered. Hence, the Tian mechanism was selected as the most appropriate for further studies of ammonia/methane combustion through a set of experiments carried out at various equivalence ratios and pressure conditions. Finally, sensitivity and pathway analyses were also performed to identify important reactions and species under high-pressure conditions, areas that need more attention for model development and emission control in future studies.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TD Environmental technology. Sanitary engineering
T Technology > TJ Mechanical engineering and machinery
Uncontrolled Keywords: Ammonia/methane combustion, detailed kinetic mechanisms, gas turbine, Ignition delay, NOx
Publisher: Elsevier
ISSN: 0016-2361
Date of First Compliant Deposit: 10 February 2017
Date of Acceptance: 27 January 2017
Last Modified: 27 Jan 2019 00:10
URI: http://orca.cf.ac.uk/id/eprint/98241

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