This paper describes an experimental and numerical study of the emission of nitrogen oxides (NOx) from the lean premixed (LPM) combustion of gaseous fuel alternatives to typical pipeline natural gas in a high intensity, single-jet, stirred reactor (JSR). In this study, CH4 is mixed with varying levels CO2 and N2. NOx measurements are taken at a nominal combustion temperature of 1800K, atmospheric pressure, and a reactor residence time of 3 ms. The experimental results show the following trends for NOx emissions as a function of fuel dilution: (1) more NOx is produced per kg of CH4 consumed with the addition of a diluent, (2) the degree of increase in emission index is dependent on the chosen diluent; N2 dilution increases NOx production more effectively than equivalent CO2 dilution. Chemical kinetic modeling suggests that NOx production is less effective for the mixture diluted with CO2 due to both a decrease in N2 concentration and the ability of CO2 to deplete the radicals taking part in NOx formation chemistry. In order to gain insight on flame structure within the JSR, three dimensional computational fluid dynamic (CFD) simulations are carried out for LPM CH4 combustion. A global CH4 combustion mechanism is used to model the chemistry. While it does not predict intermediate radicals, it does predict CH4 and CO oxidation quite well. The CFD model illustrates the flow-field, temperature variation, and flame structure within the JSR. A 3-element chemical reactor network (CRN), including detailed chemistry, is constructed using insight from spatial measurements of the reactor, the results of CFD simulations, and classical fluid dynamic correlations. GRI 3.0 is used in the CRN to model the NOx emissions for all fuel blends. The experimental and modeling results are in good agreement and suggest the underlying chemical kinetic reasons for the trends.
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December 2011
Research Papers
Experimental and Numerical Study of NOx Formation From the Lean Premixed Combustion of CH4 Mixed With CO2 and N2
Philip C. Malte
Philip C. Malte
Department of Mechanical Engineering,
e-mail: malte@u.washington.edu
University of Washington
, Seattle, WA 98105
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Philip C. Malte
Department of Mechanical Engineering,
University of Washington
, Seattle, WA 98105e-mail: malte@u.washington.edu
J. Eng. Gas Turbines Power. Dec 2011, 133(12): 121502 (7 pages)
Published Online: September 1, 2011
Article history
Received:
April 11, 2011
Revised:
April 16, 2011
Online:
September 1, 2011
Published:
September 1, 2011
Citation
Fackler, K. B., Karalus, M. F., Novosselov, I. V., Kramlich, J. C., and Malte, P. C. (September 1, 2011). "Experimental and Numerical Study of NOx Formation From the Lean Premixed Combustion of CH4 Mixed With CO2 and N2." ASME. J. Eng. Gas Turbines Power. December 2011; 133(12): 121502. https://doi.org/10.1115/1.4004127
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