Heterogeneous kinetics of coal gasification. Quarterly technical progress report, 1 February-30 April 1982. [680 to 770/sup 0/C; 8 to 30 atm]

Technical Report · Sat May 01 00:00:00 EDT 1982

OSTI ID:5323183

Calo, J M

The operation of the gradientless reactor system designed to study heterogeneous gas-char reactions under transient conditions was successfully demonstrated. CO/sub 2/ char gasification was studied at temperatures from 680 to 770/sup 0/C and at pressures from 8 to 30 atm. The transient response of the reactor resulting from a step change from inert gas (Ar) to pure CO/sub 2/ is adequately described by a simple, two-step mechanism. The determination of the rate parameters from the transient data was accomplished with the Marquardt optimization code developed for this purpose. For what is believed to be the first time in the same experiment, the active site concentration was uncoupled from the intrinsic rate constants. The active site concentration of the coconut char exhibits an Arrhenius type temperature dependence with an apparent negative activation energy. A preliminary design has been developed for a steam addition system to be used for steam-char gasification studies. This system will be constructed during the next reporting period. Various chars have been generated in a high temperature furnace system from fresh coals. These chars are to be used in the gradientless reactor system to determine the effects of char type on the intrinsic rate parameters and char reactivity.

• Research Organization: Brown Univ., Providence, RI (USA). Dept. of Engineering
• DOE Contract Number: FG22-81PC40786
• OSTI ID: 5323183
• Report Number(s): DOE/PC/40786-3; ON: DE82015637
• Resource Relation: Other Information: Portions of document are illegible
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON DIOXIDE
CHEMICAL REACTION KINETICS
CHARS
CALCULATION METHODS
COAL GASIFICATION
EXPERIMENTAL DATA
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DATA
GASIFICATION
INFORMATION
KINETICS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS PRODUCTS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification