Inclined fluidized bed system for drying fine coal
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United States of America Patent
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Feb 11, 1992
Issued Date -
N/A
app pub date -
Aug 3, 1990
filing date -
Apr 3, 1989
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Expired
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Abstract
Coal is processed in an inclined fluidized bed dryer operated in a plug-flow manner with zonal temperature and composition control, and an inert fluidizing gas, such as carbon dioxide or combustion gas. Recycled carbon dioxide, which is used for drying, pyrolysis, quenching, and cooling, is produced by partial decarboxylation of the coal. The coal is heated sufficiently to mobilize coal tar by further pyrolysis, which seals micropores upon quenching. Further cooling with carbon dioxide enhances stabilization.
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