Heating process gas for indirect shale oil retorting through the combustion of residual carbon in oil depleted shale
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United States of America Patent
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Mar 27, 1984
Grant Date -
N/A
app pub date -
Jul 1, 1983
filing date -
Jul 1, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Hot oil depleted shale from an indirect oil shale retorting process is charged into the top of a vertical shaft furnace together with sufficient oxygen to combust the residual carbon in the shale. Recycle process gas is fed into the bottom of the furnace for direct heating by the spent shale. The heated recycle process gas and combustion gases are withdrawn from the furnace separately to minimize dilution of the high BTU process gas. A selected quantity of coarse, cooled spent shale discharged from the bottom of the furnace is recycled to the top to moderate the temperature of combustion.
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