LLL In Situ Coal Gasification Project. Quarterly progress report, October--December 1977. [Hoe Creek No. 2]
- eds.
The gasification phase of Hoe Creek Coal Gasification Experiment No. 2 at Hoe Creek, Wyoming was carried out. The coal was ignited on Oct. 14, and two reverse-burn links were simultaneously initiated toward the injection well and a dewatering well. Data from traveling thermocouples, fixed thermocouples, and HFEM instrumentation indicated that there were several reverse burn paths near the bottom of the seam. The reverse-burn link to the injection well was completed on Oct. 28, and forward gasification continued for 57 days, until Dec. 25. During forward gasification, 2300 tons of coal were consumed, producing gas with a heating value of, in general, 100 to 150 Btu/scf. A steam-oxygen burn was carried out from Nov. 10 to 12; during this time a 250- to 300-Btu/scf gas was produced with no operational or safety problems. The results are quite encouraging for steam-oxygen gasification and show that a great deal remains to be learned about reverse combustion. Environmental testing continues at both Hoe Creek No. 1 and No. 2. Concentrations of phenolics in the groundwater at Hoe Creek No. 1 continue to decrease. All subsidence instrumentation at Hoe Creek No. 2 worked, including piezometers, shear strips, borehold extensometers, and slope indicators. Considerable subsurface ground motion was detected. A simple model of reverse-combustion link generation was developed that is in qualitative agreement with Hoe Creek No. 2 data. Because of the low thermal diffusivity of wet coal, the link must pass near a thermocouple for an appreciable temperature rise to be observed in a reasonable amount of time. For distances greater than 1 m, the thermal response within a week is very low. By the time a response is observed, the link would have passed many days earlier.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6818950
- Report Number(s):
- UCRL-50026-77-4
- Country of Publication:
- United States
- Language:
- English
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47 OTHER INSTRUMENTATION
AIR
BOREHOLE LINKING
CHEMICAL REACTIONS
COAL GASIFICATION
COMBUSTION
COMMINUTION
CRYOGENIC FLUIDS
ELEMENTS
ENERGY SOURCES
EXPLOSIVE FRACTURING
FLUIDS
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FUEL GAS
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LOW BTU GAS
MATHEMATICAL MODELS
MEASURING METHODS
NONMETALS
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OPERATION
OXIDATION
OXYGEN
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PERMEABILITY
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STEAM
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WATER
WYOMING