BLAST FURNACE INSTALLATION

摘要

This blast furnace installation (100) is configured such that when pulverized coal (18), which has been prepared by pulverizing high-grade coal (12) supplied by a feeder (152) to a roller mill (153), is pneumatically conveyed into a supply tank (120) by means of a combustion gas (108), pulverized coal (8), which has been prepared by drying, dry-distilling, cooling, and pulverizing low-grade coal (2) with a drying device (122), a dry-distillation device (123), a cooling device (124), and a pulverization device (125), is supplied from a storage tank (126) by a feeder (127) and pneumatically conveyed into the supply tank (120) by means of a nitrogen gas (102), and then the pulverized coals (8, 18) in the supply tank are pneumatically conveyed from a supply line (119) into an injection lance (116) by means of a carrier gas (107), a control unit (160) controls the feeders so as to gradually increase the supply amount (C2) of pulverized coal (8) while maintaining the total amount of supply amount (C1) of pulverized coal (18) and supply amount (C2) of pulverized coal (18) to be supplied to the tuyere at a prescribed amount (Ct).