Thermochemical analysis of premixed ammonia/biogas flames in a model gas turbine swirl combustion system

Zhao, Xu, Ng, Jo-Han, Mong, Guo Ren, Mashruk, Syed, Lee, Chew Tin, Fang, Xueliang, Wong, Keng Yinn, Ooi, Jong Boon, Valera Medina, Agustin ORCID: https://orcid.org/0000-0003-1580-7133 and Chiong, Meng-Choung 2024. Thermochemical analysis of premixed ammonia/biogas flames in a model gas turbine swirl combustion system. Renewable Energy 236 , 121478. 10.1016/j.renene.2024.121478 Item availability restricted.

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Abstract

This study examined the premixed NH3/biogas combustion at near stoichiometric using an experimentally validated numerical method. Raising the NH3 wt.% in NH3/CH4 combustion at φ = 0.8 brought up the average reaction temperature (Tavg) due to heat retention. Intensified by CO2 addition, Tavg in NH3/biogas increased by a factor of 1.2 compared to NH3/CH4. At φ = 1.1, higher NH3 and CO2 wt.% reduced Tavg. The local Damköhler number (Da) was reduced marginally in the absence of CO2 as φ increased from 0.8 to 1.1. Conversely, local Da grew considerably in the presence of CO2 and was particularly sensitive to variations in the excess air ratio. Increased NH3 wt.% promoted NO emission, primarily via N + OH → NO + H and H + HCNO → CH2 + NO pathways. NH3/biogas produced more NO than NH3/CH4 from φ = 0.9 to 1.1, but as φ approached 1.1, NO is generally lowered. N2O is produced mainly by NH + NO → N2O + H. Fuel-lean operation generally results in a higher N2O than fuel-rich operation. The NH3/biogas combustion at φ = 0.8 is a potential clean fuel solution in lowering NO emissions, as compared to NH3/CH4 combustion.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	License information from Publisher: LICENSE 1: Title: This article is under embargo with an end date yet to be finalised.
Publisher:	Elsevier
ISSN:	0960-1481
Date of First Compliant Deposit:	3 October 2024
Date of Acceptance:	24 September 2024
Last Modified:	07 Nov 2024 23:00
URI:	https://orca.cardiff.ac.uk/id/eprint/172478

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