THERMAL SCIENCE

International Scientific Journal

Ping Wang

,

Wenfeng Liu

,

Weijia Qian

,

Kang Cheng

,

Yongqian Wang

,

Subhajit Roy

INVESTIGATION OF NO EMISSION CHARACTERISTIC OF AMMONIA-HYDROGEN FLAME IN A TWO-STAGE MODEL COMBUSTOR

ABSTRACT
The laminar burning velocity and NO formation process of ammonia-hydrogen combustion within a two-stage combustion chamber were investigated numerically in the present study. A chemical reactor network method involving perfectly stirred reactor, plug flow reactor, and partially stirred reactor configurations with the 24-species Xiao mechanism was implemented to simulate the premixed ammonia-hydrogen-air combustion process. The effects of inlet temperature and pressure conditions on the laminar burning velocity were investigated. Results proved that elevated pressure condition decreased primary flame thickness leading to lower laminar burning velocity while inlet temperature increased flame temperature which in turn increased the laminar burning velocity. Investigation of the effect of humidification on the laminar burning velocity showed that humidification can counteract the effect of high inlet temperature. The NO emission studies indicated a twofold impact of pressure on NO formation processes: preventing NO formation in the primary combustion zone, and promoting thermal NO formation in the lean combustion zone. The minimum amounts of NO emission were obtained at total equivalence ratios of 0.4. Humidification prevented the NO formation in the lean combustion through the competitive effect of H2O on O, whilst temperature effect was comparatively small. Humidity and pressure were optimized in the two-stage configuration achieve both low emission and high efficiency.
KEYWORDS
Ammonia-hydrogen combustion, Two-stage combustion, chemical reactor network, laminar burning velocity, NO emission
PAPER SUBMITTED: 2023-04-28
PAPER REVISED: 2023-08-06
PAPER ACCEPTED: 2023-08-23
PUBLISHED ONLINE: 2023-10-08
DOI REFERENCE: https://doi.org/10.2298/TSCI230428199W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 2, PAGES [1689 - 1699]
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Investigation of no emission characteristic of ammonia-hydrogen flame in a two-stage model combustor

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence