Patent ID: 9005317
Filing Date: 2015-04-14
Classification: C10L

Abstract:
1. A method for producing a solid fuel, the method comprising: pulverizing low-rank coal; preparing a slurry by mixing the pulverized low-rank coal with a solvent oil; evaporating water in the slurry by heating the slurry to a boiling point of water or more; producing fine coal by separating the solvent oil from the slurry, while a non-volatile component contained in the low-rank coal is not evaporated by performing solid-liquid separating against the slurry; and briquetting the fine coal, wherein, by heating the slurry to the boiling point of water or more, a nonvolatile component contained in the low-rank coal is extracted with the solvent oil and the extracted nonvolatile component covers an outer surface of the low-rank coal and inner surfaces of pores of the low-rank coal, a content of the non-volatile component is made in about 1 mass % with respect to the solid fuel having been dried; a content of a heavy oil added from outside is made less than 0.5 mass % with respect to the solid fuel having been dried; and in said solid-liquid separating the weight ratio of dewatered coal, kerosene, and the coal nonvolatile component in the solid phase is 99:33:1.