METHOD FOR PRODUCING ASHLESS COAL

摘要

Provided is a method for producing ashless coal, said method comprising a slurry preparation step in which a slurry is prepared by mixing coal and a solvent, the coal that is included in the slurry is dewatered, and the temperature of the slurry is increased. The slurry preparation step comprises a preparation/dewatering step and a preparation/temperature increase step. In the preparation/dewatering step, preparation of the slurry and dewatering of the coal are performed by mixing coal and a liquid solvent that is circulated during a circulation step. In the preparation/temperature increase step, the slurry is prepared and the temperature of the slurry is increased by mixing the slurry with solvent vapor that is circulated during the circulation step.

主权项

1. A method for producing ashless coal, the method comprising:
mixing coal and a solvent to prepare a slurry, and performing a dehydration of the coal contained in the slurry and a temperature increase of the slurry; heating the slurry to extract a solvent-soluble component of the coal, to obtain an extracted slurry; separating the extracted slurry into a solution containing the solvent-soluble component of the coal and a solid-content concentrated liquid having concentrated therein a solvent-insoluble component of the coal; evaporating and separating the solvent from the solution to obtain ashless coal; and circulating the solvent to a slurry preparation, wherein the slurry preparation comprises: mixing liquid solvent of the circulating step with the coal to prepare the slurry and dehydrate the coal; and mixing vapor solvent of the circulating step with the slurry to increase the temperature increase of the slurry.