METHOD FOR BLOWING-IN OF BLAST FURNACE Russian patent published in 2004 - IPC

FIELD: ferrous metallurgy, in particular, equipment for blowing-in of blast furnaces after construction works and first-order and eleven-order repair works.

SUBSTANCE: method involves charging blast-furnace coke into hearth to the level of air tuyeres with following charging of pitch coke having sulfur content less than 0.25% in an amount of 1.156·V_s·√_c, t, where V_s is volume of shoulders, m³; √_c is bulk mass of blast-furnace coke, t/m³; filling remaining volume of furnace with blowing-in burden containing blast-furnace coke; charging burden with constant ore charge from height H=11-0.008/T-800/m above the level of air tuyeres, where T is blowing temperature, ⁰C, at initial stage of blowing-in procedure; blowing in natural gas in an amount providing for theoretical burning temperature of 1,750-1,800⁰C; increasing oxygen concentration in blowing gas from 21% to the level providing for theoretical burning temperature of 2,000-2,100⁰C.

EFFECT: increased efficiency by reducing introduction of sulfur together with fuel of blowing-in burden.

2 cl, 4 tbl