Patent ID: 9714394
Date: 2017-07-25
CPC Classifications: C10L

Claim:
1. A method for producing an ashless coal, comprising: a slurry preparation step of mixing a coal and a solvent, thereby acquiring a slurry; an extraction step of heating the slurry, thereby extracting a coal component soluble in the solvent, wherein a combustible gas is generated in the extraction step; a separation step of separating the slurry which has been obtained in the extraction step into a solution in which the coal component soluble in the solvent is dissolved and a solid-content concentrated liquid in which a coal component insoluble in the solvent is concentrated; an ashless coal acquirement step of evaporating and separating the solvent from the solution which has been separated in the separation step, thereby acquiring an ashless coal; a by-product acquirement step of evaporating and separating the solvent from the solid-content concentrated liquid which has been separated in the separation step, thereby acquiring a by-product coal; a step of combining the by-product coal as a fuel for heating the slurry with at least a portion of the combustible gas generated in the extraction step, the portion being sufficient to assure stable combustion of the by-product coal; and, wherein the combined by-product coal and portion of the combustible gas generated in the extraction step are combusted to create heat for the slurry which has been obtained in the slurry preparation step.