| 摘要 |
<p>[Problem] To propose a method for operating a blast furnace, the method making it possible to improve the degree of combustion of pulverized coal blown into the furnace from the tuyeres and to reduce the reducing-material unit. [Solution] A method for operating a blast furnace into which a solid reducing material is blown also from the tuyeres through the lances, wherein when the amount of the solid reducing material to be blown from the tuyeres is 150 kg/t or larger per ton of the pig iron, double-pipe lances are used as the lances to blow the solid reducing material into the furnace through each inner pipe and blow 100ºC or lower oxygen into the furnace through the space between each inner pipe and the outer pipe and pulverized coal is used as the solid reducing material to be blown into, the pulverized coal having an average volatile content that is higher than 25 mass% but not higher than 50 mass%.</p> |
