| 摘要 |
PURPOSE:To save the consumption of energy, by forming the reducing gas to melt reduced iron in a melting-gasifying furnace, and reducing an iron ore into reduced iron with the reducing gas recovered from said furnace. CONSTITUTION:In a fluidized-bed reducing oven 20, a pulverized iron ore is converted into reduced iron with reducing gas recovered from a melting-gasifying furnace 1 through a line 12. Said reduced iron is formed into briquettes by a briquetting means 26 and then melted to form pig iron in the melting-gasifying furnace 1. Into this melting-gasifying furnace 1, fuel 10 based on C and H2 is blown through charging openings above tuyeres, while the same fuel 10 and O2 are blown through the tuyeres. The fuel 10 is burnt and gasified by O2 to form high-temp. reducing gas based on CO and H2. The high-temp. reducing gas is let flow upwards through a coke-packed layer and melt the reduced iron thereabove. The melted iron is let flow downwards and converted into pig iron. The reducing gas is recovered from the top of the furnace 1 and supplied to the fluidized- bed reducing oven 20. |
