A coal gasification system (1) for gasifying coal, which is provided with: a coal gasification reaction furnace (13) which has a partial oxidation unit (21) and a thermal decomposition unit (22); a carbon dioxide recovery device (18) which separates a product gas produced in the coal gasification reaction furnace into a thin gas that has a low carbon dioxide gas concentration and a thick gas that has a higher carbon dioxide gas concentration in comparison to the thin gas; a thin gas channel (25) through which the thin gas is carried; a thick gas channel (26) through which the thick gas is carried; a first carrier device (11) which carries and supplies coal to the partial oxidation unit by air currents using the thin gas as a carrier gas; and a second carrier device (12) which carries and supplies coal to the thermal decomposition unit by air currents using the thick gas as a carrier gas.
