A sweep efficiency model for underground coal gasification

Journal Article · Tue Jan 01 04:00:00 EST 1985 · In Situ; (United States)

OSTI ID:5974437

Chang, H L; Edgar, T F; Himmelblau, D M

A new model to predict sweep efficiency for underground coal gasification (UCG) has been developed. The model is based on flow through rubble in the cavity as well as through the open channel and uses a tanks-in-series model for the flow characteristics. The model can predict cavity growth and product gas composition given the rate of water influx, roof collapse, and spalling. Self-gasification of coal is taken into account in the model, and the coal consumption rate and the location of the flame front are determined by material and energy balances at the char surface. The model has been used to predict the results of the Hoe Creek III field tests (for the air gasification period). Predictions made by the model such as cavity shape, product gas composition, temperature profile, and overall reaction stoichiometry between the injected oxygen and the coal show reasonable agreement with the field test results.

• Research Organization: Department of Chemical Engineering, The University of Texas at Austin, Austin, TX
• OSTI ID: 5974437
• Journal Information: In Situ; (United States), Journal Name: In Situ; (United States) Vol. 9:2; ISSN ISOMD
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
CARBONACEOUS MATERIALS
CAVITIES
COAL
COAL DEPOSITS
COAL GASIFICATION
COAL SEAMS
ENERGY SOURCES
FIELD TESTS
FOSSIL FUELS
FUELS
GASIFICATION
GEOLOGIC DEPOSITS
IN-SITU GASIFICATION
IN-SITU PROCESSING
MATERIALS
MATHEMATICAL MODELS
MINERAL RESOURCES
PROCESSING
RESOURCES
SWEEP EFFICIENCY
TESTING
THERMOCHEMICAL PROCESSES
WATER INFLUX