Inclined fluidized bed system for drying fine coal
AssigneeWestern Research Institute
InventorsChang Y. Cha, Norman W. Merriam, John E. Boysen
Life of this patent
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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.
Claims66
A process for the drying and stabilizing of fine coal comprising:
- employing a zonal inclined fluidized bed containing coal and using an inert fluidizing gas;
- means for feeding coal;
- means for selectively heating said gas;
- means for rapidly quenching said fluidized bed;
- and
- means for collecting products.
A process for the drying and stabilizing of fine coal comprising:
- employing a zonal inclined fluidized bed using a coal feeder and an inert fluidizing gas;
- means for selectively drying said coal;
- means for selectively pyrolyzing said coal;
- means for rapidly quenching said coal;
- and employing a product coal transfer system.
A process for the drying and stabilizing of fine coal comprising:
- employing a three zone inclined fluidized coal bed with carbon dioxide as the fluidizing medium;
- using zone one for drying said coal;
- using zone two for partial pyrolysis of said coal;
- using zone three for rapid quenching of said coal;
- and
- employing a product coal collector.
Dependencies are inferred from the claim text.