| 摘要 |
PURPOSE:To economize energy consumption by charging the formed reduced iron of high temp. together with a coke raw material into a shaft type half-carbonizing furnace, reducing the same to half-carbonized coke by the sensible heat of the reduced iron and charging the half-carbonized coke and the reduced iron into a melting and gasifying furnace. CONSTITUTION:In a melting and gasifying furnace 10, oxygen 9, pulverized coal 10, steam 11, and limestone powder 13a are blown through a tuyere 4, and the pulverized coal 10 is converted to combustion gas by the oxygen 9, whereby the high temp. gas consisting essentially of CO and H2 is formed. The gas is allowed to rise in a coke-packed layer (b) to melt the reduced iron (a) in the upper part thereof. The reduced iron is dropped in the counter current state with the high temp. gas to form pig iron C; at the same time, the reducing gas 12 recovered through a gas removal port 3 is blown into a shaft furnace 20 to reduce the iron ore in the furnace to reduced iron 7. The high temp. reduced iron 7 and the coke 8 are charged to a shaft type half-carbonizing furnace 30 to form half-carbonized coke. The half-carbonized coke and the reduced iron are charged through a charge port 2 into the furnace 1. |
