Laboratory characterization of the spalling properties of the rock cores from the UCG (Underground Coal Gasification) test site near Porto Alegre in Brazil
Technical Report
·
OSTI ID:5596483
One of the principal problems encountered in most of the Underground Coal Gasification (UCG) field tests conducted thus far has been excessive water influx. Spalling-enhanced-drying of coal and overburdens rock has been identified as the principal mechanism of water influx observed in the Hanna UCG field tests in Wyoming Spalling is defined as the chipping, fracturing and breaking off of small rock fragments from the cavity roof due to the combined action of mechanical loading and thermally induced stresses. Spalling is also responsibble for vertical cavity growth and a portion of the heat losses during UCG. A laboratory core characterization method has been developed to determine the spalling properties of overburden rock which are essential to make influx and cavity geometry predictions for a prospective field test. In this study, the spalling properties of the representative rock cores from the UCG test site near Porto Alegre in Brazil have been determined using the laboratory core characterization test which utilizes the temperature-gradient-induced spalling hypothesis.
- Research Organization:
- Colorado Univ., Boulder (USA). Dept. of Chemical Engineering; Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5596483
- Report Number(s):
- UCID-21339; ON: DE88006720
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
014000 -- Coal
Lignite
& Peat-- Combustion
BENCH-SCALE EXPERIMENTS
BRAZIL
CARBONACEOUS MATERIALS
CAVITIES
COAL
COAL GASIFICATION
COMMINUTION
CONSUMPTION RATES
DATA
DEVELOPING COUNTRIES
DRILL CORES
ENERGY SOURCES
EXPERIMENTAL DATA
FEDERAL REGION VIII
FOSSIL FUELS
FRACTURING
FUELS
GASIFICATION
IN-SITU GASIFICATION
IN-SITU PROCESSING
INFORMATION
LATIN AMERICA
MATERIALS
MECHANICAL PROPERTIES
NORTH AMERICA
NUMERICAL DATA
PROCESSING
ROCKS
SEDIMENTARY ROCKS
SHALES
SILTSTONES
SOUTH AMERICA
STRESSES
TEMPERATURE GRADIENTS
TESTING
THERMAL STRESSES
THERMOCHEMICAL PROCESSES
USA
WATER INFLUX
WYOMING
010404* -- Coal
Lignite
& Peat-- Gasification
014000 -- Coal
Lignite
& Peat-- Combustion
BENCH-SCALE EXPERIMENTS
BRAZIL
CARBONACEOUS MATERIALS
CAVITIES
COAL
COAL GASIFICATION
COMMINUTION
CONSUMPTION RATES
DATA
DEVELOPING COUNTRIES
DRILL CORES
ENERGY SOURCES
EXPERIMENTAL DATA
FEDERAL REGION VIII
FOSSIL FUELS
FRACTURING
FUELS
GASIFICATION
IN-SITU GASIFICATION
IN-SITU PROCESSING
INFORMATION
LATIN AMERICA
MATERIALS
MECHANICAL PROPERTIES
NORTH AMERICA
NUMERICAL DATA
PROCESSING
ROCKS
SEDIMENTARY ROCKS
SHALES
SILTSTONES
SOUTH AMERICA
STRESSES
TEMPERATURE GRADIENTS
TESTING
THERMAL STRESSES
THERMOCHEMICAL PROCESSES
USA
WATER INFLUX
WYOMING