Fluidized bed selective pyrolysis of coal
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United States of America Patent
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-
Dec 15, 1992
Issued Date -
N/A
app pub date -
Oct 17, 1990
filing date -
Apr 26, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention discloses a process for the pyrolysis of coal which comprises the effective utilization of two zonal inclined fluidized beds, where said zones can be selectively controlled as to temperature and heating rate. The first zonal inclined fluidized bed serves as a dryer for crushed coal and additionally is controlled to selectively pyrolyze said coal producing substantially carbon dioxide for recycle use. The second zonal inclined fluidized bed further pyrolyzes the coal to gaseous, liquid and char products under controlled temperature and heating rate zones designed to economically integrate the product mix. The gas and liquid products are recovered from the gaseous effluent stream while the char which remains can be further treated or utilized in a subsequent process step.
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