METHOD OF PERFORMING BLAST-FURNACE SMELTING Russian patent published in 2003 - IPC

FIELD: ferrous metallurgy; blast-furnace process; control of blastfurnace process. SUBSTANCE: proposed method includes loading the furnace with charge, putting-on oxygen-enriched and humidified blast, injection of additional fuel into furnace hearth through tuyeres, control of blast and blast-furnace top gas parameters; lower pressure differential of gas flow is regulated through change of humidity of blast according to the following relationship: Δϕ = 100•(ΔP_i-ΔP₀)/ΔP₀•1/K or through change of content of oxygen in blast according to the following relationship: Δω_i = 100•(ΔP₀-ΔP₁)/ΔP₀•1/Z, where Δϕ is magnitude of change of humidity of blast in % relative to dry blast; ΔP₀, ΔP₁ are pressure differentials of gas flow in initial position and at present moment, respectively, kPa; Δω_i is magnitude of change of content of oxygen in blast, % relative to dry blast; K and Z are coefficients which are equal to 4.4-6.5 and 5.4-6.2, respectively. EFFECT: increased output of furnace; reduced consumption of coke; avoidance of emission of dust. 3 cl, 2 tbl, 1 ex