Hot air furnace equipment and hot air furnace operation method

摘要

A hot-blast stove system (1) includes: a hot-blast stove (4) for performing an on-blast operation for delivering a hot blast to a blast furnace (2) and an on-gas operation for combusting a fuel gas in the hot-blast stove; a fuel gas supply line (5) for supplying a BFG produced by the blast furnace (2) to the hot-blast stove (4) as the fuel gas; and a blower (52) provided in the fuel gas supply line (5) and configured to raise a pressure of the BFG. The fuel gas supply line (5) takes out the BFG from a part of a blast-furnace-top-gas recovery line (3) downstream of a top pressure recovery turbine system (35), the blast-furnace-top-gas recovery line (3) being configured to take out the BFG from a furnace top (21) of the blast furnace (2). A power of the blower (52) is supplied from a waste pressure recovery turbine system (441) for recovering a waste pressure and a waste heat from an waste gas of the hot-blast stove (4) during the on-gas operation.