| 摘要 |
PURPOSE:To reduce the cost of sieving and transporting powder raw materials and to permit control of a blowing rate with high accuracy by conveying lump raw materials and powder raw materials, subjecting the materials to simple classification at the top of a blast furnace, charging the lump raw materials into the furnace from the furnace top, transferring the powder raw materials to tuyeres by making use of gravity and blowing the same into the furnace. CONSTITUTION:The lump raw materials 3 and the powder raw materials 5 are not classified and are conveyed to the top of the blast furnace 4 where the materials are introduced into a simple classifier 21. The materials 3 are charged into the furnace 4 by using furnace top charging equipment. The powder raw materials 5 are stored in a hopper 23 and are supplied from a distributing valve 24 to a powder raw material transport pipe 25. The materials 5 are moved by gravity and are fed through an intermediate hopper 26 to a powder blowing device 27. The materials are then supplied to a hopper 29 from which the materials are blown by a feeding device 29 into the furnace 4 from blast furnace tuyeres 15. The wear of the transport piping is thereby substantially obviated and the blowing rate of the materials 5 is controlled with high accuracy.
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