| 摘要 |
A method for operating a blast furnace is provided with which problems that arise when dust coal is used as a supplemental reducing material in a blast furnace operation are eliminated and it is possible to contribute to a reduction in CO2 emission by using biomass in place of dust coal. The method for operating a blast furnace into which dust coal is blown as a supplemental reducing material through the tuyeres is characterized by carbonizing biomass (1) in a carbonizer (2), pulverizing the resultant biomass char (3), and blowing the pulverized char into the furnace through the tuyeres simultaneously with dust coal (4). It is preferable that the dust coal and the biomass char be mixed with each other by means of a mixer (5) and then blown into the furnace through the tuyeres, and that the dust coal and the biomass char be blown through the tuyeres so that the total volatile concentration therein is 10 mass% or more. |
