Pulverized coal drying system for pulverizer, pulverized coal drying method therefor, pulverized coal drying program, pulverizer, and integrated gasification combined cycle

A pulverized coal drying program for a pulverizer that dries a supplied carbonaceous feedstock by using a drying fluid, the program causing a computer to carry out a flow rate control process of controlling a flow rate of the drying fluid within upper and lower limits of the flow rate of the drying fluid that are set to dry a plurality of types of the carbonaceous feedstock having different moisture contents in such a way that a temperature of the drying fluid discharged from the pulverizer approaches a target temperature, wherein

• the drying fluid is a transport gas that transports the carbonaceous feedstock,
• the upper and lower limits are set with respect to a predetermined amount of supplied carbonaceous feedstock in a state in which the drying fluid discharged from the pulverizer has the target temperature in such a way that the upper limit is the flow rate of the drying fluid for drying the carbonaceous feedstock containing a largest moisture content and the lower limit is the flow rate of the drying fluid for drying the carbonaceous feedstock containing a lowest moisture content, and
• the target temperature is a temperature of the transport gas discharged from the pulverizer, the temperature being expected when the dried carbonaceous feedstock reaches a desired dryness.