Publication detail
Numerical Modelling of Combustion in 1.5 Mw Low-nox Burner
JUŘENA, T. BĚLOHRADSKÝ, P. SKRYJA, P. HUDÁK, I.
English title
Numerical Modelling of Combustion in 1.5 Mw Low-nox Burner
Type
conference paper
Language
en
Original abstract
Results from CFD simulations of swirling non-premixed gas flame using a low-NOx gas burner are presented and compared to experimental data measured during a testing campaign in a semi-industrial water-cooled combustion chamber. It is shown, how results are sensitive to the mixing rate constant of EDM, which is employed in a simulation of swirling turbulent diffusion flame. Specifically, temperatures are overestimated with the constant being set to 4 (the default value in Ansys Fluent), which leads to false prediction of NOx formation. Temperature peaks are reduced by lowering the mixing rate constant. An acceptable agreement with measured outlet and peak flame temperatures is achieved, when the constant is set to 0.6. With this value, however, highly increased concentrations of unburned species are reported at the outlet. Predicted values deviate from the measurements about three orders of magnitude. Based on the concentrations of unburned species and oxygen in the flue gas at the outlet, the best results are obtained with the constant 1.2.
English abstract
Results from CFD simulations of swirling non-premixed gas flame using a low-NOx gas burner are presented and compared to experimental data measured during a testing campaign in a semi-industrial water-cooled combustion chamber. It is shown, how results are sensitive to the mixing rate constant of EDM, which is employed in a simulation of swirling turbulent diffusion flame. Specifically, temperatures are overestimated with the constant being set to 4 (the default value in Ansys Fluent), which leads to false prediction of NOx formation. Temperature peaks are reduced by lowering the mixing rate constant. An acceptable agreement with measured outlet and peak flame temperatures is achieved, when the constant is set to 0.6. With this value, however, highly increased concentrations of unburned species are reported at the outlet. Predicted values deviate from the measurements about three orders of magnitude. Based on the concentrations of unburned species and oxygen in the flue gas at the outlet, the best results are obtained with the constant 1.2.
Keywords in English
combustion, CFD, swirling, non-premixed, NOx, burner
Released
01.10.2016
Publisher
Aidic Servizi, S.r.l.
Location
Milano, Italy
ISBN
978-88-95608-42-6
ISSN
2283-9216
Book
Chemical Engineering Transactions
Volume
52
Edition number
52
Pages from–to
1261–1266
Pages count
6
BIBTEX
@inproceedings{BUT132692,
author="Tomáš {Juřena} and Petr {Bělohradský} and Pavel {Skryja} and Igor {Hudák},
title="Numerical Modelling of Combustion in 1.5 Mw Low-nox Burner",
booktitle="Chemical Engineering Transactions",
year="2016",
volume="52",
month="October",
pages="1261--1266",
publisher="Aidic Servizi, S.r.l.",
address="Milano, Italy",
isbn="978-88-95608-42-6",
issn="2283-9216"
}