METODA DAN PERALATAN PENGERINGAN BATU BARA, METODA UNTUK MENGAWETKAN BATU BARA YANGT KUALITASNYA TELAH DITINGKATKAN, BATU BARA YANG KUALITASNYA TELAH DITINGKATKAN, DAN PROSES SERTA SISTEM UNTUK MEMPRODUKSI BATU BARA YANG KUALITASNYA TELAH DITINGKATKAN

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 DEG 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 DEG C. at a heating rate of not less than 100 DEG C. per minute and then cooled to a temperature of 250 DEG C. or below at a cooling rate of not less than 50 DEG C. per minute, the resulting reformed coal is cooled to a temperature of 70 DEG 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.