Development of a five-step global methane oxidation-NO formation mechanism for lean-premixed gas turbine combustion

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.2817117· OSTI ID:351631

Nicol, D G; Malte, P C ^[1]; Hamer, A J; Roby, R J ^[2]; Steele, R C ^[3]

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1. Univ. of Washington, Seattle, WA (United States). Dept. of Mechanical Engineering
2. Combustion Science and Engineering, Inc., Columbia, MD (United States)
3. Solar Turbines, Inc., San Diego, CA (United States)

It is known that many of the previously published global methane oxidation mechanisms used in conjunction with computational fluid dynamics (CFD) codes do not accurately predict CH{sub 4} and CO concentrations under typical lean-premixed combustion turbine operating conditions. In an effort to improve the accuracy of the global oxidation mechanism under these conditions, an optimization method for selectively adjusting the reaction rate parameters of the global mechanisms (e.g., pre-exponential factor, activation temperature, and species concentration exponents) using chemical reactor modeling is developed herein. Traditional global mechanisms involve only hydrocarbon oxidation; that is, they do not allow for the prediction of NO directly from the kinetic mechanism. In this work, a two-step global mechanism for NO formation is proposed to be used in combination with a three-step oxidation mechanism. The resulting five-step global mechanism can be used with CFD codes to predict CO, CO{sub 2}, and NO emission directly. Results of the global mechanism optimization method are shown for a pressure of 1 atmosphere and for pressures of interest for gas turbine engines. CFD results showing predicted CO and NO emissions using the five-step global mechanism developed for elevated pressures are presented and compared to measured data.

• Sponsoring Organization: USDOE
• OSTI ID: 351631
• Report Number(s): CONF-980615--
• Journal Information: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 2 Vol. 121; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
33 ADVANCED PROPULSION SYSTEMS
CARBON DIOXIDE
CARBON MONOXIDE
COMBUSTION
COMBUSTION KINETICS
COMPUTERIZED SIMULATION
GAS TURBINES
METHANE
NITROGEN OXIDES