Blast furnace operation methods

Abstract

The operation method of this blast furnace includes: a first blowing step, in which biochar or the aforementioned biochar and pulverized coal, and a first reducing gas are blown into the blast furnace through a general tuyer; and a second blowing step, in which a second reducing gas is blown into the aforementioned interior of the aforementioned blast furnace through the aforementioned general tuyer, the second reducing gas being obtained by separating and removing at least a portion of CO2 gas and H2O gas from blast furnace gas; and in the aforementioned first blowing step, when blowing in the aforementioned biochar, the aforementioned biochar blown in through the aforementioned general tuyer is selected using carbon content, hydrogen content and heat of decomposition as management indicators.

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