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US 4,750,913 AGranted
Cooling of dried coal
AssigneeShell Mining Company
InventorMark A. Siddoway
Life of this patent
Estimating the term…
Abstract
Wet coal is processed in a dryer, producing dry, hot coal. More wet coal is blended with the dry, hot coal and the mixture is processed in a cooler, resulting in a cool, blended dry coal.
Claims12
A process for noncombustibly drying particulate coal comprising:
- separating the coal into a stream of coarse particles and a stream of small particles;
- noncombustibly heating and drying the stream of small particles;
- blending the heated stream of small particles with the stream of coarse particles;
- and
- cooling the combined stream of particles by passing ambient air through the combined stream.
2 more elements
A process for noncombustibly drying particulate coal comprising:
- separating the coal into two streams;
- noncombustibly heating and drying one of the streams;
- blending the heated stream with the other stream;
- and
- cooling the combined streams by passing ambient air through the combined streams.
2 more elements
A process for noncombustibly drying particulate coal comprising:
- separating the coal into two wet coal streams;
- passing one wet coal system into a dryer to form a bed;
- heating air in a furnace;
- admitting the heated air to the dryer to fluidize the bed;
- withdrawing dryer exhaust gas;
- passing the exhaust gas through a cyclone and withdrawing coal fines from the cyclone;
- withdrawing a hot, dry coal stream from the dryer;
- blending the drier hot dry coal stream with the cyclone coal fines;
- withdrawing cyclone exhaust gas;
- wet scrubbing the cyclone exhaust gas to form a coal fines slurry and scrubber exhaust gas;
- passing the coal fines slurry to a sedimentation pool;
- blending the second wet coal stream with the drier hot dry coal stream and the cyclone coal fines;
- passing the latter blended stream to a cooler to form a bed;
- fluidizing the latter bed with ambient air;
- withdrawing cooler exhaust gas and passing the gas to a cyclone;
- passing exhaust gas from the latter cyclone to a baghouse and collecting coal fines therein;
- passing the latter coal fines to the furnace as fuel for heating the air;
- and
- withdrawing cooled coal from the cooler and blending the cooled coal with coal fines from the latter cyclone.
16 more elements
Dependencies are inferred from the claim text.