Blast Furnace Operation Method

Abstract: Since blast furnace gas discharged from a blast furnace contains a large amount of CO gas that did not contribute to ore reduction, blast furnace gas containing unused CO gas is again blown into the blast furnace through blast furnace tuyeres to reduce carbon oxides discharged from the blast furnace. If CO2 is removed from the blast furnace gas containing unused CO gas, and CO gas removed of CO2 is blown into the blast furnace again, nitrogen accumulates in the blast furnace, and O2 should be blown in instead of air blowing. Then, since there is no nitrogen in front of the tuyeres, the amount of gas generated in front of the tuyeres is insufficient, the temperature in front of the tuyeres rises, and it becomes difficult to operate the blast furnace. According to the present invention, N2 gas or CO2 gas is blown and circulated along with CO gas blown from the tuyeres.

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