Roll press

摘要

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.

主权项

1. 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.