Preheating of oil shale prior to pyrolysis
A process is claimed for preheating oil shale in which the oil shale is partially preheated to 200/sup 0/ F to 400/sup 0/ F in a first lift pipe followed by final preheat to temperatures of between 400/sup 0/ F and 650/sup 0/ F in a second lift pipe. Hydrocarbons released from the shale in both the first and second lift pipes are incinerated in an incinerator/recuperator. In order to provide adequate incineration and combustion of the hydrocarbons released in the first low temperature lift pipe, the entrainment gas or first gas stream is a low Btu gas preferably produced from conventional gasification of carbonaceous material. The low Btu entrainment gas along with released hydrocarbons is utilized as a fuel in the incinerator/recuperator and also may be utilized for other combustion applications in oil shale pyrolysis processing. In oil shale pyrolysis carried out with ceramic balls as heat exchange bodies, a portion of the low Btu entrainment gas is conveniently utilized to fuel the ball heater. The heat generated in the incinerator/recuperator, is utilized to preheat various process gases to thereby recover and recuperate the heating value of the hydrocarbons released during preheat.
- Assignee:
- Tosco Corp
- Patent Number(s):
- US 4384947
- OSTI ID:
- 5963254
- Resource Relation:
- Patent File Date: Filed date 10 Aug 1981; Other Information: PAT-APPL-291360
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
OIL SHALES
HEAT TREATMENTS
PYROLYSIS
COMBUSTION
HYDROCARBONS
PIPES
WASTE HEAT UTILIZATION
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
ORGANIC COMPOUNDS
OXIDATION
THERMOCHEMICAL PROCESSES
WASTE PRODUCT UTILIZATION
040402* - Oil Shales & Tar Sands- Surface Methods
320304 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Waste Heat Recovery & Utilization