Kinetic evaluation of the reactivity of various coal chars for gasification with carbon dioxide in comparison with steam

Journal Article · Tue Jan 01 00:00:00 EST 1985 · Int. Chem. Eng.; (United States)

OSTI ID:6507967

Kasaoka, S; Sakata, Y; Tong, C

Chars from coals of fuel ratio 1 to 8 were gasified with a CO/sub 2/ - N/sub 2/ mixture at atmospheric pressure. At 1,000/sup 0/ C or less, when the reaction is controlling, the rate of gasification is dependent on the type of coal, and the reactivity is minimal at a fuel ratio (fixed carbon/volatile matter) of about 3. The fractional gasification f and the dimensionless gasification time, when normalized by the time to reach f = 0.5, are correlated by a single curve for all chars, based on a modified volumetric model for the reaction. The rate of gasification and the reactivity of the char are considered to be more closely controlled by the chemical properties of the char surface than by its composition, mineral content, and pore structure.

• Research Organization: Okayama University, Okayama
• OSTI ID: 6507967
• Journal Information: Int. Chem. Eng.; (United States), Vol. 25:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON DIOXIDE
CHEMICAL REACTIONS
CHARS
ACTIVATION ENERGY
CHEMICAL REACTION KINETICS
GASIFICATION
COAL GASIFICATION
CHEMICAL PROPERTIES
COMPARATIVE EVALUATIONS
CONTROLLED ATMOSPHERES
FUELS
STEAM
SURFACE PROPERTIES
ATMOSPHERES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ENERGY
KINETICS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification