| 摘要 |
PURPOSE:To stably maintain the condition of a blast furnace operation by adjusting the charging rate of solid reducing agents to the axial center part region of the furnace according to the quantity of fluctuation in pressure drop at the time of charging the solid reducing agents for improving air permeability to the axial center part region of the solid reducing agent layers. CONSTITUTION:The blast furnace operation is carried out by alternately charging the solid reducing agents (coke, etc.) and ore to the blast furnace from the furnace top and laminating the solid reducing agent layers and ore layers. The solid reducing agents for improving the air permeability are properly charged to the axial center part region of the solid reducing agent layers and/or the solid reducing agents are properly charged to the axial center part region of the ore layers at this time. The pressure drop (difference between blowing pressure from tuyeres and furnace top pressure) during the blast furnace operation is momentarily measured simultaneously therewith and the rate at which the solid reducing agents are supplied to the axial center part region is so adjusted as to satisfy the equation according to the quantity of the fluctuation in the pressure drop. In the equation, P.I is the quantity of fluctuation in the pressure drop; RWc is weight % of the total quantity of the axial center charge solid reducing agents to be charged to the axial center part region with respect to the total charge quantity of the solid reducing agents constituting the solid reducing agent layers. The air permeability in the furnace core part is thereby kept stable and the furnace condition is stably maintained. |
