METHOD FOR CONDUCTING BLAST-FURNACE MELTING Russian patent published in 2023 - IPC C21B5/00 

FIELD: ferrous metallurgy.

SUBSTANCE: blast furnace process. Charge materials and coke are loaded into the furnace, combined blast is blown in, and the parameters of the top gas are continuously monitored. Melting is carried out at a natural gas consumption of 140-250 m³/t of cast iron, the ore load is regulated by the mass of the iron ore feed, the change in the ore load along the radius of the furnace in the near-wall zone, limited by 0.9-1.0 radius, the top and the near-axial zone, is additionally determined, limited by 0.1-0.15 radius of the top. With an increase in the consumption of natural gas by more than or equal to 5.0% of the base value and an increase in the hydrogen content in the top gas by more than 0.5% of the base value, a decrease in ROL_rel. by 0.01-0.1 units, and the factor N is increased by 0.05-0.5 units for every 0.5% hydrogen contained in the top gas above the base value, where: ROL_rel. is the relative ore load in the axis in relation to the average ore load, units; N is the ratio of the relative ore load on the periphery to the relative ore load in the axis (POL_rel./ROL_rel.), units; POL_rel. is the relative ore load on the periphery in relation to the average ore load; units.

EFFECT: increased degree of gas utilization in the blast furnace under conditions of operation with its high consumption, as well as ensuring smooth high-performance operation of the blast furnace and reducing the specific consumption of coke.

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