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Effect of steam on H/sub 2/, CO/sub 2/, H/sub 2/S, CO, and COS concentrations in combustion-retort offgas

Technical Report ·
OSTI ID:6413063
The effect of steam on the offgas composition of combustion retorts was determined by interrupting the otherwise continuous steam flow in S-24 for one hour while other variables, including temperature, remained relatively constant. The offgas composition was determined by frequent gas analyses. The largest effect of interrupting the steam flow was to decrease the rate of H/sub 2/ production by a factor of 2.6, primarily due to elimination of one H/sub 2/O-char reaction. The rate of CO/sub 2/ production decreased by a factor of 1.7. After subtracting the CO/sub 2/ production due to carbon combustion, this result implies that steam accelerates the rate of carbonate decomposition by a factor of 3.0. In the absence of steam, the H/sub 2/S production rate dropped by a factor of 1.5, indicating the importance of steam-iron sulfide reactions. Finally, the production rates of CO and COS increased by factors of 1.5 and 1.7. These results are compared to results from laboratory studies of oil shale chemistry and to gas production during other parts of this and other LLNL pilot retort runs. Finally, the ability of steam to significantly decrease the pour point of shale oil from combustion retorts is noted.
Research Organization:
Lawrence Livermore National Lab., CA (USA)
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
6413063
Report Number(s):
UCID-19093; ON: DE81027836
Country of Publication:
United States
Language:
English

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Related Subjects

04 OIL SHALES AND TAR SANDS
040402* -- Oil Shales & Tar Sands-- Surface Methods
BITUMINOUS MATERIALS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CARBON OXYSULFIDE
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FLUIDS
FOSSIL FUELS
FUELS
GASEOUS WASTES
GASES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INFORMATION
MATERIALS
MINERAL OILS
NONMETALS
NUMERICAL DATA
OIL SHALES
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POUR POINT
RETORTING
SHALE GAS
SHALE OIL
STEAM
SULFIDES
SULFUR COMPOUNDS
WASTES