Comparative species concentrations in CH[sub 4]/O[sub 2]/Ar flames doped with N[sub 2]O, NO, and NO[sub 2]

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(94)90200-3· OSTI ID:7178729

Williams, B A; Fleming, J W ^[1]

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1. Naval Research Lab., Washington, DC (United States). Chemistry Div.

Laser-induced fluorescence is used to monitor the relative concentrations of the species OH, CH, NH, CN, NCO, and NO in a 10-torr premixed stoichiometric methane/oxygen/argon flame doped with N[sub 2]O, NO, and NO[sub 2] at 0.0086 mole fraction. The relative yields of combustion intermediates for equivalent mole fractions of the different dopants are measured, and comparisons are made with PREMIX calculations based on currently accepted reaction rates. This procedure allows the chemical pathways followed by the different dopants to be compared under nearly identical conditions. Comparison of radical concentrations between the NO- and N[sub 2]O-doped flames shows that CN and NCO are underpredicted for the N[sub 2]O-doped flame, while NO is overpredicted. Conversely, NH is underpredicted for the NO-doped flame. These findings suggest that reburn consumption of NO is roughly 50% higher than predicted by current models. Nevertheless, the fraction of NO that reacts with hydrocarbon radicals in the reburn reactions is found to be fairly minor ([le] 20%). Under the present conditions, NO[sub 2] is rapidly converted to NO, leading to quantitatively similar behavior for these two dopants.

• OSTI ID: 7178729
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 98:1-2; ISSN 0010-2180; ISSN CBFMAO
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
034000* -- Natural Gas-- Combustion
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ALKANES
AMINES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMBUSTION PRODUCTS
CONCENTRATION RATIO
CYANIDES
DOPED MATERIALS
HYDROCARBONS
HYDROXYL RADICALS
KINETICS
MATERIALS
METHANE
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NITROUS OXIDE
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
REACTION INTERMEDIATES
REACTION KINETICS