| 摘要 |
PURPOSE: A blast furnace operation method when blast furnace circumstances are not balanced is provided to maximize productivity of blast furnace through the optimum blast furnace circumstances by promptly removing causes of non-balance of blast furnace circumstances and preventing long term non-balance of blast furnace circumstances. CONSTITUTION: In a blast furnace operation method for improving non-balance of blast furnace circumstances, the blast furnace operation method when blast furnace circumstances are not balanced comprises furnace heat recovery step of increasing furnace heat inside blast furnace to a temperature of 1,540 deg.C or more; inner furnace air-permeability securing step of satisfying control items including charging material drop, air pressure deviation, top temperature, air permeability of lump phase zone(32) and flow rate of furnace mouth after the furnace heat recovery step; and hot blast securing step of satisfying inner furnace conditions such as inner furnace gas flow rate, furnace mouth flow rate and increasing rate of hot blast volume in the state that stabilized air permeability is secured in the blast furnace, wherein the blast furnace operation method further comprises operation capacity increasing step of increasing charging ratio (O/C) of materials charged into the blast furnace, and wherein the furnace heat recovery step is accomplished by maintaining the charging ratio (O/C) of materials charged into the blast furnace through charging hole of the blast furnace to 3.0 or less.
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