Preheating of oil shale prior to pyrolysis

Details Preheating of oil shale prior to pyrolysis Preheating of oil shale prior to pyrolysis

1981-08-10

1983-05-24

Gantz, Delbert E.

Mineral oils: processes and products

Products and compositions

Lubricating oils

201 31, 202109, 202111, C10B 5306, C10G 100, C10G 102

Patent

active

043849474

ABSTRACT:
A process for preheating oil shale in which the oil shale is partially preheated to 200.degree. F. to 400.degree. F. in a first lift pipe followed by final preheat to temperatures of between 400.degree. F. and 650.degree. F. in a second lift pipe. Hydrocarbons released from the oil 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.

REFERENCES:
patent: 3925190 (1975-12-01), Whitcombe et al.
patent: 4087347 (1978-05-01), Langlois et al.
patent: 4210492 (1980-07-01), Roberts
patent: 4226699 (1980-10-01), Nutter

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