Evaluation of NO sub x mechanisms for lean, premixed combustion

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Journal of Engineering for Gas Turbines and Power; (United States)

DOI:https://doi.org/10.1115/1.2906608· OSTI ID:5256906

Corr, R A; Malte, P C; Marinov, N M ^[1]

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1. Combustion Lab., Dept. of Mechanical Engineering, Univ. of Washington, Seattle, WA (US)

In this paper the formation of the oxides of nitrogen, NO{sub x}, is examined through experiments and chemical kinetic modeling for lean, premixed combustion in a laboratory, atmospheric pressure, jet-stirred reactor. The experimental conditions are as follows: fuel-air equivalence ratio ({phi}) of 0.6, temperatures of 1460 to 1730 K, and reactor loadings of 20 to 150 kg/sec-m{sup 3}-atm{sup 2}, which correspond to reactor mean residence times of 11.4 to 1.8 milliseconds. Two fuels are examined: ethylene because of its importance as a combustion intermediate, and methane, because of its importance as a component of natural gas. Besides the premixed operation, the reactor also is operated nonpremixed. For both modes, the NO{sub x} increases with decreasing loading, from abut 3-4 ppmv at the highest loading to about 11-21 ppmv at the lowest loading for the ethylene fuel. This increase in NO{sub x} occurs because a hot spot develops on centerline when the reactor is lightly loaded. Also for the lowest loading, the nonpremixed mode produces about twice as much NO{sub x} as the premixed mode, i.e., about 21 versus 11 ppmv. At the other reactor loadings, however, because of the intense mixing, the NO{sub x} levels are only slightly elevated for the nonpremixed mode compared to the premixed mode. Upon switching to methane fuel, the NO{sub x} decreases by about 25 percent.

• OSTI ID: 5256906
• Journal Information: Journal of Engineering for Gas Turbines and Power; (United States), Journal Name: Journal of Engineering for Gas Turbines and Power; (United States) Vol. 114:2; ISSN JETPE; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
AIR
ALKANES
ALKENES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMICAL REACTORS
COMBUSTION
EQUIPMENT
ETHYLENE
EXTRAPOLATION
FLUIDS
FUELS
GAS TURBINES
GASES
HYDROCARBONS
JETS
KINETICS
MACHINERY
MATHEMATICAL MODELS
MEDIUM PRESSURE
METHANE
MIXING
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
STIRRING
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMOCHEMICAL PROCESSES
TURBINES
TURBOMACHINERY