Isothermal pyrolysis and combustion of oil shale in steam

Conference · Sat Apr 01 04:00:00 EST 1989

OSTI ID:6226725

Coburn, T. T.; Taylor, R. W.; Morris, C. J.

In a solid-recycle retort, the burnt shale that serves as a heat carrier promotes coke formation. Steam inhibits coking reactions and has long been used for this purpose in hydrocarbon crackers. As part of a search for practical methods to minimize oil loss due to coking, we studied steam-moderated flash pyrolysis of Green river and Devonian oil shales. Volatile hydrocarbon production from a laboratory fluidized bed was monitored by using a high-temperature method that largely eliminated extraneous effects due to adsorption/desorption of oil vapors. Kinetics of oil shale flash pyrolysis in steam and in argon were comparable. The effects of steam on fluidize-bed experiments was compared with the effect on moving-bed, solid-recycle (pilot-scale) experiments and on temperature-programmed batch pyrolyses. Deuterium-exchange, carried out in the pilot retort, demonstrated the reactivity of hydrocarbons C-H bonds with high-temperature D/sub 2/O. We also investigated the effect of steam on spent shale combustion. 28 refs., 7 figs., 5 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6226725
• Report Number(s): UCRL-101002; CONF-8904193-3; ON: DE89011894
• Country of Publication: United States
• Language: English

Related Subjects

04 OIL SHALES AND TAR SANDS
040402* -- Oil Shales & Tar Sands-- Surface Methods
ARGON
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CARBONIZATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FLUIDIZED BEDS
FLUIDS
FOSSIL FUELS
FUELS
GASES
HEAVY WATER
HYDROGEN COMPOUNDS
KINETICS
MATERIALS
NMR SPECTRA
NONMETALS
OIL SHALES
OXYGEN COMPOUNDS
PYROLYSIS
RARE GASES
REACTION KINETICS
SPECTRA
SPENT SHALES
STEAM
THERMOCHEMICAL PROCESSES
WATER