Methods of producing water-resistant solid fuels
AssigneeGTL Energy Holdings Pty Limited
InventorsRobert R. French, Robert A. Reeves, Patrick B. Auell
Life of this patent
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Abstract
The invention provides a method by which high moisture low rank coal or other carbonaceous material may be transformed into a high-energy, water resistant product. The raw feed is comminuted then mechanically compacted by a roller press with rolls of a specified profile to mobilize the inherent moisture and collapse most of the interstitial pore space. The mobilized moisture is then removed by low-temperature drying and the material is sized and shaped to form a product that is resistant to re-absorption of water or other liquids. The present invention will promote the use of low rank coal for liquefaction and gasification.
Claims20
A method of beneficiating a solid carbonaceous fuel comprising
- comminuting a solid fuel feedstock to form a crushed feedstock;
- compacting the crushed feedstock in roll press comprising first and second counter-rotating rolls, to form a compacted material;
- and,
- drying the compacted material to produce a solid carbonaceous fuel.
A roll press comprising first and second counter-rotating rolls
- wherein the first and second rolls each comprise a circumferential profile of assemblages of ridge and valley arcs repeating at equal spacing around the circumference of the roll;
- wherein the ridge and valley arcs are connected by straight tangent segments;
- and
- wherein the roll press is configured to rotate the first and second rolls in timed counter-rotation to match together peaks and valleys of the first and second counter-rotating rolls, respectively.
A solid carbonaceous fuel having a bulk density between about 500 Kg/m3 and about 750 Kg/m3.
Dependencies are inferred from the claim text.