Oxides of nitrogen (NOx) are pollutants emitted by combustion processes during power generation and transportation that are subject to increasingly stringent regulations due to their impact on human health and the environment. One NOx reduction technology being investigated for gas-turbine engines is exhaust-gas recirculation (EGR), either through external exhaust-gas recycling or staged combustion. In this study, the effects of different percentages of EGR on NOx production will be investigated for methane–air and propane–air flames at a selected adiabatic flame temperature of 1800 K. The variability and uncertainty of the results obtained by the gri-mech 3.0 (GRI), San-Diego 2005 (SD), and the CSE thermochemical mechanisms are assessed. It was found that key parameters associated with postflame NO emissions can vary up to 192% for peak CH values, 35% for thermal NO production rate, and 81% for flame speed, depending on the mechanism used for the simulation. A linear uncertainty analysis, including both kinetic and thermodynamic parameters, demonstrates that simulated postflame nitric oxide levels have uncertainties on the order of ±50–60%. The high variability of model predictions, and their relatively high associated uncertainties, motivates future experiments of NOx formation in exhaust-gas-diluted flames under engine-relevant conditions to improve and validate combustion and NOx design tools.
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NOx Emissions Modeling and Uncertainty From Exhaust-Gas-Diluted Flames
Antonio C. A. Lipardi,
Antonio C. A. Lipardi
Alternative Fuels Laboratory,
Department of Mechanical Engineering,
McGill University,
Montréal, QC H3A OC3, Canada
e-mail: antonio.lipardi@mail.mcgill.ca
Department of Mechanical Engineering,
McGill University,
Montréal, QC H3A OC3, Canada
e-mail: antonio.lipardi@mail.mcgill.ca
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Jeffrey M. Bergthorson,
Jeffrey M. Bergthorson
Associate Professor
Alternative Fuels Laboratory,
Department of Mechanical Engineering,
McGill University,
Montréal, QC H3A OC3, Canada
e-mail: jeff.bergthorson@mcgill.ca
Alternative Fuels Laboratory,
Department of Mechanical Engineering,
McGill University,
Montréal, QC H3A OC3, Canada
e-mail: jeff.bergthorson@mcgill.ca
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Gilles Bourque
Gilles Bourque
Siemens Canada,
Power Generation, Distributed Generation,
Montréal, QC H9P 1A5, Canada
e-mail: gilles.bourque@siemens.com
Power Generation, Distributed Generation,
Montréal, QC H9P 1A5, Canada
e-mail: gilles.bourque@siemens.com
Search for other works by this author on:
Antonio C. A. Lipardi
Alternative Fuels Laboratory,
Department of Mechanical Engineering,
McGill University,
Montréal, QC H3A OC3, Canada
e-mail: antonio.lipardi@mail.mcgill.ca
Department of Mechanical Engineering,
McGill University,
Montréal, QC H3A OC3, Canada
e-mail: antonio.lipardi@mail.mcgill.ca
Jeffrey M. Bergthorson
Associate Professor
Alternative Fuels Laboratory,
Department of Mechanical Engineering,
McGill University,
Montréal, QC H3A OC3, Canada
e-mail: jeff.bergthorson@mcgill.ca
Alternative Fuels Laboratory,
Department of Mechanical Engineering,
McGill University,
Montréal, QC H3A OC3, Canada
e-mail: jeff.bergthorson@mcgill.ca
Gilles Bourque
Siemens Canada,
Power Generation, Distributed Generation,
Montréal, QC H9P 1A5, Canada
e-mail: gilles.bourque@siemens.com
Power Generation, Distributed Generation,
Montréal, QC H9P 1A5, Canada
e-mail: gilles.bourque@siemens.com
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 13, 2015; final manuscript received September 14, 2015; published online November 3, 2015. Editor: David Wisler.
J. Eng. Gas Turbines Power. May 2016, 138(5): 051506 (10 pages)
Published Online: November 3, 2015
Article history
Received:
July 13, 2015
Revised:
September 14, 2015
Citation
Lipardi, A. C. A., Bergthorson, J. M., and Bourque, G. (November 3, 2015). "NOx Emissions Modeling and Uncertainty From Exhaust-Gas-Diluted Flames." ASME. J. Eng. Gas Turbines Power. May 2016; 138(5): 051506. https://doi.org/10.1115/1.4031603
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