24. Development of the HyperCoal (Ash-free coal) production system-1 : Solvent extraction of coal and caracteristics of ash removing

Abstract

To increase the coal utilization, it is essential to reduce CO_2 emission by developing more efficient coal combustion systems, such as gas turbines, than the conventional PCF systems. In order to fire coals in gas turbines, however, coal should be ash-free. As a fundamental study for producing Ash-free coal (named HyperCoal), coal extraction and filtration tests were performed using several kinds of coals and organic solvents. A coal extraction rate was increased with the increase in extraction temperature. As a result, 40wt% of bituminous Nantun coal was extracted with 1-methylnaphthalene and ash content in the extracted coal decreased to 200ppm.