| 摘要 |
This invention relates to a process for retorting raw shale comprising the following steps: (1) passing raw shale downwardly through the upper zone of a two-zoned vertical retort; (2) introducing a gas comprising molecular oxygen and flue gas at a temperature of about 590 DEG to about 760 DEG C., and ambient pressure into said upper zone and passing the same upwardly through said upper zone in contact with said raw shale; (3) recovering from an upper part of said upper zone a product comprising shale oil and retort gas; (4) passing the treated shale from a lower part of said upper zone downwardly through the lower zone of said two-zoned retort; (5) introducing molecular oxygen at a temperature of about 25 DEG to about 100 DEG C. and flue gas at a temperature of about 25 DEG to about 200 DEG C., and ambient pressure into said lower zone and passing the same upwardly through said lower zone in contact with said treated shale; (6) recovering from an upper part of said lower zone a preheated gas comprising molecular oxygen and preheated flue gas; and (7) recovering from a lower part of said lower zone spent shale.
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