In this study, combustion and emission characteristics of methane mixed with steam (CH4/ H2O) and the products of methane reforming with steam (CO/H-2/H2O) were compared. Four fuel compositions were analysed: CH4+H2O, CH4+2H(2)O, and products of complete methane reforming in these mixtures, respectively. A comparison was carried out through the numerical model created via Ansys Fluent 2019 R2. A combustion process was simulated using a non-premixed combustion model, standard k -e turbulence model and P-1 radiation model. The combustor heat capacity for interrelated fuel compositions was kept constant due to air preheating before combustion. The inlet air temperature was varied to gain a better insight into the combustion behaviour at elevated temperatures. The effect of steam addition on the emission characteristics and flame temperatures was also evaluated. NOx formation was assessed on the outlet of the combustion zone. The obtained results indicate that syngas has a higher combustion temperature than methane (in the same combustor heat capacity) and therefore emitted 27% more NOxcomparing to methane combustion. With the air inlet temperature increment, the pollutant concentration difference between the two cases decreased. Steam addition to fuel inlet resulted in lesser emissions both for methane and syngas by 57% and 28%, respectively. In summary, syngas combustion occurred at higher temperature and produced more NOxemissions in all cases considered. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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Univ Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, Brazil
Centeno, Felipe Roman
Brittes, Rogerio
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Univ Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, Brazil
Brittes, Rogerio
Franca, Francis H. R.
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Univ Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, Brazil
Franca, Francis H. R.
da Silva, Cristiano Vitorino
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Reg Integrated Univ Alto Uruguai & Miss, Dept Engn & Comp Sci, BR-99700000 Erechim, RS, BrazilUniv Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, Brazil
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Univ Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, Brazil
Centeno, Felipe Roman
Brittes, Rogerio
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Univ Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, Brazil
Brittes, Rogerio
Franca, Francis H. R.
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Univ Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, BrazilUniv Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, Brazil
Franca, Francis H. R.
da Silva, Cristiano Vitorino
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Reg Integrated Univ Alto Uruguai & Miss, Dept Engn & Comp Sci, BR-99700000 Erechim, RS, BrazilUniv Fed Rio Grande do Sul, Dept Mech Engn, BR-90050170 Porto Alegre, RS, Brazil