Hoe Creek II field experiment on underground coal gasification, preliminary results
A second in-situ coal gasification experiment was performed by Lawrence Livermore Laboratory at Hoe Creek in Wyoming. The Linked Vertical Wells scheme for in-situ coal gasification was used. The experiment took 100 days for air flow testing, reverse combustion linking, forward combustion gasification, and post-burn steam flow. Air was used for gasification except for a 2-day test with oxygen and steam. Reverse combustion linking took 14 days at 1.6 m/day. Air requirements for linking were 0.398 Mgmol per meter of link assuming a single direct link. The coal pyrolysed during linking was 17 m/sup 3/, which corresponds to a single link 1.0 m in diameter. There was, however, strong evidence of at least two linkage paths. The detected links stayed below the 3 m level in the 7.6 coal seam; however, the product flow from the forward-burn gasification probably followed the coal-overburden interface not the reverse burn channels at the 3 m level. A total of 232 Mgmols (194 Mscf) of gas was produced with heating value above 125 kJ/mol (140 Btu/scf) for significant time periods and an average of 96 kJ/mol (108 Btu/scf). During the oxygen-steam test the heating value was above 270 kJ/gmol (300 Btu/scf) twice and averaged 235 kJ/gmol (265 Btu/scf). The coal recovery was 1310 m/sup 3/ (1950 ton). Gasification was terminated because of decreasing product quality not because of burn through. The product quality decreased because of increasing underground heat loss.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7049918
- Report Number(s):
- UCRL-80592; CONF-780417-8
- Country of Publication:
- United States
- Language:
- English
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Hoe Creek No. 2: underground coal gasification experiment with air and oxygen/steam injection periods
Hoe Creek No. 2: underground coal gasification experiment with air and oxygen/steam injection periods
Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
AIR
BOREHOLE LINKING
CALORIFIC VALUE
CHEMICAL REACTIONS
COAL GASIFICATION
COMBUSTION
COMBUSTION PROPERTIES
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LOSSES
ENERGY SOURCES
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HEAT LOSSES
IN-SITU GASIFICATION
IN-SITU PROCESSING
NONMETALS
NORTH AMERICA
OXIDATION
OXYGEN
PROCESSING
REVERSE COMBUSTION
ROCKY MOUNTAIN REGION
STEAM
USA
WYOMING