Kinetics of hydrogen-oxygen-argon and hydrogen-oxygen-argon-pyridine combustion using a flat flame burner

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6233620

Peterson, R C

Fuels such as coal, oil shale and residual oils contain nitrogen which is converted to HCN, NO, and N/sub 2/ during combustion. The utilization of these energy sources in an environmentally acceptable manner requires combustion strategies which maximize conversion of bound nitrogen to the desirable product N/sub 2/. To understand the process of HCN, NO, and N/sub 2/ formation, a comprehensive fuel nitrogen reaction mechanism is proposed, tested, and verified in this study. Both H/sub 2/-O/sub 2/-Ar and H/sub 2/-O/sub 2/Ar-Pyridine flames are considered; the former have a known reaction mechanism and are used to verify the flame analysis procedures while the latter simulate the combustion of the nitrogeneous portion of coal or heavy oils. Experimental flame data is obtained using three diagnostics: a thermocouple (temperature), optical absorption (OH and OH rotational temperature) and a sampling probe (NO via chemiluminescent analyzer; HCN and NH/sub 3/ via bubbler and ion specific electrodes; H/sub 2/, O/sub 2/, Ar, N/sub 2/, N/sub 2/O, CO, CO/sub 2/, and CH/sub 4/ via two gas chromatographs). Water is determined by an argon atomic balance. Two flame analysis procedures are used. Integration of the conservation equations determines species and temperature profiles for direct comparison with measured data; and the measured mole fractions of species involved in the reaction. From the H/sub 2/-O/sub 2/-Ar-Pyridine flames a comprehensive fuel nitrogen reaction mechanism is proposed and verified. The rate coefficients of three reactions HCN + OH ..-->.. HNCO + H, NH + O ..-->.. NO + H, NH + NO ..-->.. N/sub 2/O + H are determined from experimental data. The mechanism describes HCN destruction, formation of NO, N/sub 2/, and N/sub 2/O and is consistent with all fuel nitrogen data in the literature. Both experimental data and calculated results show maximum N/sub 2/ conversion at an equivalence ratio of 1.3:1.4.

• OSTI ID: 6233620
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080800 -- Hydrogen-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
ARGON
AZINES
BURNERS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMILUMINESCENCE
CHROMATOGRAPHY
COMBUSTION KINETICS
CYANIDES
ELEMENTS
FLAMES
FLUIDS
GAS CHROMATOGRAPHY
GASES
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROCYANIC ACID
HYDROGEN
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
LUMINESCENCE
MEASURING INSTRUMENTS
METHANE
NITRIC OXIDE
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PROBES
PYRIDINE
PYRIDINES
RARE GASES
REACTION KINETICS
SEPARATION PROCESSES
TEMPERATURE GRADIENTS
THERMOCOUPLES