Coal drying method and equipment, method for aging reformed coal and aged reformed coal, and process and system for producing reformed coal

摘要

In drying coal to be used as fuel for a coal-fired boiler, the coal is dried at a temperature of 80 to 150° C. by using combustion exhaust gas having passed through an air heater for the coal-fired boiler. Moreover, after medium-quality or low-quality coal is heated to a temperature of 300 to 500° C. at a heating rate of not less than 100° C. per minute and then cooled to a temperature of 250° C. or below at a cooling rate of not less than 50° C. per minute, the resulting reformed coal is cooled to a temperature of 70° C. or below and stored for 1 month or more in a state of isolation from the atmosphere. In producing the aforesaid reformed coal, the medium-quality or low-quality coal is heated by using combustion exhaust gas obtained at the outlet of an economizer included in the coal-fired boiler equipment or at the outlet of a denitrator included therein.