Mineral oils: processes and products – Products and compositions – Lubricating oils
Patent
1983-07-01
1984-03-13
Gantz, Delbert E.
Mineral oils: processes and products
Products and compositions
Lubricating oils
201 29, 201 34, 201 13, C10G 102, C10B 4902, C10B 5306
Patent
active
044366116
ABSTRACT:
Recycle gas for the indirect retorting of oil shale, is heated after the oil has been recovered from the gas, utilizing the residual carbon in hot oil depleted shale. The hot oil depleted shale is charged into a vertical shaft furnace where it is combusted by the introduction of air into the upper portion of the furnace. The heat so generated is recovered from the lower part of the furnace for heating the recycle gas and cooling the spent shale. A portion of the coarse fraction of the cooled spent shale discharged from the bottom of the furnace is recycled to the top to regulate the temperature of combustion. The recycle gas may be heated directly by countercurrent contact with the hot, spent shale in the lower portion of the furnace or indirectly in a heat exchanger by an inert gas which is circulated through the lower portion of the furnace. The gaseous products of stoichiometric combustion of the residual carbon from the upper part of the furnace are withdrawn at an intermediate level with, and as a component of, the recycle or inert gas withdrawn from the bottom of the furnace.
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Jaquay Louis H.
Venetti Mark
Caldarola Glenn A.
Dravo Corporation
Gantz Delbert E.
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