Lean flammability limits and laminar burning velocities of CH/sub 4/-air-graphite mixtures and fine coal dusts
Gas temperature, reactant concentrations, graphite burnup, and burning velocity have been measured close to the lean limit of CH/sub 4/-air-graphite mixtures on a low-pressure, premixed flame burner. The graphite dust was of about 4 /mu/m diameter. These experiments suggest a gas temperature of 1550 K at the lean flammability limit. This is the basis of a chemical kinetic model for fine coal dust combustion that assumes CH/sub 4/ to be devolatilized from coal and gas phase reaction to be dominant. Computed relationships of the dependence of lean limit coal concentration on the proportion of volatile matter in the coal agree well with those of experiments. The model also yields values of laminar burning velocity over a wide range of coal concentrations and volatile contents.
- Research Organization:
- Depts. of Mechanical Engineering (D.B.; S.E.-D.H.) and Fuel and Energy (G.D.-L.; S.E.-D.H.), Univ. of Leeds, Leeds LS2 9JT (GB)
- OSTI ID:
- 5863064
- Journal Information:
- Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 77:1; ISSN CBFMA
- Country of Publication:
- United States
- Language:
- English
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AIR
ALKANES
BURNERS
CARBON
CHEMICAL REACTION KINETICS
COAL FINES
COMBUSTION KINETICS
COMBUSTION PROPERTIES
DATA
DEVOLATILIZATION
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ELEMENTS
EXPERIMENTAL DATA
FLAMMABILITY
FLUID FLOW
FLUIDS
GASES
GRAPHITE
HYDROCARBONS
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KINETICS
LAMINAR FLOW
METHANE
MINERALS
MIXTURES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHASE STUDIES
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