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US 11,345,870 B2Granted
Processing of low rank coal
AssigneeEcogensus LLC
InventorBjornulf Ostvik
Life of this patent
Estimating the term…
Abstract
A method of processing coal includes placing coal having a heat content between about 3,000 BTU/lb and about 9,000 BTU/lb and a moisture content between about 20 wt % and about 60 wt % in a vessel. The coal is heated by conduction. A pressure in the vessel is reduced to below atmospheric pressure, thereby reducing the coal, such that an average primary particle size of the coal is less than 1 millimeter. The reduced coal is shaped to yield a fuel composition.
Claims20
A method of processing coal, the method comprising:
- placing coal having a heat content between about 3,000 BTU/lb and about 9,000 BTU/lb and a moisture content between about 20 wt % and about 60 wt % in a vessel;
- heating the coal by conduction;
- reducing a pressure in the vessel to below atmospheric pressure by pulling vapor from a vapor space of the vessel using a vacuum pump, thereby reducing the coal, such that an average primary particle size of the coal is less than 1 millimeter;
- and
- shaping the reduced coal to yield a fuel composition.
2 more elements
Dependencies are inferred from the claim text.