METHOD OF OPERATING SMELTING REDUCTION FURNACE

摘要

PURPOSE:To assure the high-temp. necessary for smelting reduction of a metal and to improve productivity by heating powder coal to a specific temp. to lump the coal, then charging the lumped coal into the furnace at the time of blowing the powder coal from the furnace wall charge ports provided to the side wall between furnace top charge ports and tuyeres. CONSTITUTION:A packed layer 2 of a solid carbon reducing agent is formed in the lower part in the vertical reduction furnace 1 and a fluidized bed 3 of the solid carbon reducing agent is formed above the same. Powder ore 5 is blown from the tuyeres 4 provided along the outer circumference of the side wall of the reduction furnace 1 to effect the smelting reduction of the metal oxide. The wall charge ports 8 are provided to the side wall between the furnace top charge port 7 and the tuyeres 4 and the powder coal to constitute the solid carbon reducing agent 6 is charged from these ports 8 and is lumped while the coal is heated to 500-1200 deg.C by the sensible heat and/or latent heat of the in furnace gas flowing into the ports 8. The adequate packed layer 2 is formed by using the powder coal prepd. by mixing the powder coal having a high viscosity and low viscosity. The packed layer 2 of the coarse- grained solid coal reducing agent 6 is positively formed in this way at the low initial cost and the productivity of a molten metal 11 is enhanced.