The Chevron STB process (also known as Staged Turbulent Bed Retorting Process) is an above-ground shale oil extraction technology. It is classified as a hot recycled solids technology.[1]
The Chevron STB process is a hot recycled solids technology, which processes small particles of oil shale. It was invented by Paul W. Tamm and Gordon E. Langlois in the Chevron Research Company laboratory in Richmond, California.[2] As a heat carrier, it uses oil shale ash, produced by combustion of spent oil shale in the separate combustor.[3]
In this process, crushed oil shale is fed into the top of the retort where it is mixed with the hot oil shale ash. The oil shale moves downward through the retort as fluidized bed of particles. While descending, the heat is transferred from the oil shale ash to the raw oil shale causing pyrolysis. As a result, oil shale decomposes to shale oil vapors, oil shale gas and spent oil shale. A stripping gas is inserted from the bottom of retort, which carries oil vapors into solids separation section. The fine particles are directed to the combustor while oil vapors are moved to the condenser. In condenser, shale oil is separated from water vapor and product gases. On the bottom of retort the spent shale is transported to the combustor.[3][4]
^Burnham, Alan K.; McConaghy, James R. (2006-10-16). "Comparison of the acceptability of various oil shale processes" (PDF). Golden: 26th Oil shale symposium. UCRL-CONF-226717. Archived from the original (PDF) on 2016-02-13. Retrieved 2007-05-29.
^US 4199432, Tamm, Paul W. & Langlois, Gordon E., "Staged turbulent bed retorting process", published 1980-04-22, assigned to Chevron Research Co.
^ ab
Agarwal, Ashok K. (May 1986). "Air Pollution Control Alternatives for Shale Oil Production Operations". United States Environmental Protection Agency. pp. 202–204. EPA-68–01-6487. Retrieved 2010-01-30.
^
Tamm, P.W.; Bertelsen, C.A.; Handel, G.M.; Spars, B.G.; Wallman, P.H. (1982-03-01). "Chevron STB oil shale retort". Energy Progress. 2 (1). New York: American Institute of Chemical Engineers: 37–42.
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