Journal
PROCEEDINGS OF THE COMBUSTION INSTITUTE
Volume 37, Issue 2, Pages 1741-1748Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2018.06.138
Keywords
Mechanism validation; Nitrogen oxides (NOx); Nitrous oxide (N2O); Nitrogen dioxide (NO2); High-resolution transmission molecular absorption database (HITRAN)
Funding
- Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), Energy Carriers (Japan Science and Technology Agency (JST))
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Ammonia (NH3) direct combustion is attracting attention for energy utilization without CO2 emissions, but fundamental knowledge related to ammonia combustion is still insufficient. This study was designed to examine effects of radiation heat loss on laminar ammonia/air premixed flames because of their very low flame speeds. After numerical simulations for 1-D planar flames with and without radiation heat loss modeled by the optically thin model were conducted, effects of radiation heat loss on flame speeds, flame structure and emissions were investigated. Simulations were also conducted for methane/air mixtures as a reference. Effects of radiation heat loss on flame speeds were strong only near the flammability limits for methane, but were strong over widely diverse equivalence ratios for ammonia. The lower radiative flame temperature suppressed the thermal decomposition of unburned ammonia to hydrogen (H-2) at rich conditions. The equivalence ratio for a low emission window of ammonia and nitric oxide (NO) in the radiative condition shifted to a lower value than that in the adiabatic condition. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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