| 摘要 |
FIELD: oil and gas industry.SUBSTANCE: invention refers to a method for obtaining improved solid fuel by crushing low-grade coal, mixing the crushed low-grade coal with oily solvent so that s suspension is obtained, heating the suspension at least to the water boiling point for water evaporation with evaporation of moisture contained in the suspension, separating the oily solvent from the suspension so that pulverised coal is obtained; at that, the oil obtained by solid substance-fluid separation can be returned as a circulating oil, briquetting fine coal and heating the suspension at least to the water boiling point, non-volatile components contained in low-grade coal are extracted with an oily solvent, and outside surface of low-grade coal and inside surfaces of pores of low-grade coal are covered with extracted non-volatile components, and content of added heavy oil will be less than 0.5 wt % and preferably 0% relative to the solid fuel weight after the drying process is completed.EFFECT: reduction of manufacturing costs and load on the environment; high strength for transportation and improved solid fuel.1 cl, 2 ex, 5 dwg |
