Modified coal production method and modified coal production apparatus

摘要

A method for producing modified coal, said method comprising: a first drying step (S11) for heating air taken from the outside, fluidizing high-water content coal using the heated air to give a fluidized coal bed, and evaporating moisture from the high-water content coal in the fluidized coal bed to give primarily dried coal; a second drying step (S12) for indirectly heating the primarily dried coal, further evaporating moisture from the primarily dried coal to give dried cool and, at the same time, recovering first steam evaporated from the primarily dried coal; a dry distillation step (S20) for dry distilling the dried coal to give modified coal and, at the same time, recovering, as exhaust gas, combustion exhaust gas that remains after supplying dry distillation heat required for dry distillation of the dried coal to thereby generate second steam; and a cooling step (S30) for cooling the modified coal. In the first drying step, the air is indirectly heated by the first steam. In the second drying step, the primarily dried coal is indirectly heated using the second steam.