AN IMPROVED SYSTEM TO PRODUCE LOW ASH CLEAN COAL AND SUPERCLEAN COALS

摘要

An improved system to produce low ash clean coal and superclean coal from high ash coals, comprising: at least a feed-preparation zone, an extraction zone, a solvent recovery zone, a precipitation zone, and an organic water separation zone, the feed-preparation zone (C) enabling mixing of specific quanti ties of coal (A), and solvent (B) to produce a coal slurry; the extraction zone allows extraction of the coal-solvent mixture through maintaining the temperature and pressure inside the reactor at prepderemined level, and allowing a varying residence time of the coal slurry corresponding to the process parameters, a filter unit (D) for filtrating the extracted coal-solvent mixture; a flash-unit (F) for receiving the filtrate from the filter unit (D) and allowing a recovery of the solvent (B) in the flash-unit (F), a sudden-pressure-drop in the flash-unit allowing a boiling off the solvent (B) thereby making it possible to recover a substantial portion of the solvent (B); and a storage means to receive the residue (E) fromthe filter unit (D) for storing,