To reduce equipment cost and to utilize finely powdered raw material by forming layers of a raw iron ore and coke on an upper part of a tuyere provided on a lower part of the furnace, providing an empty tank inside of a shaft on its upper part to reduce the speed of the combustion gas to prevent the blow-up of the dust.
In a vertical shaft cupola, blast furnace and melting furnace in which a plurality of tuyeres 7 are provided in a belly 4 above a hot metal hearth 2 and a slag floor 3 of a hearth 1, and a shaft 5 is provided thereabove, the raw material 9 such as iron ore, coke and lime is charged from a furnace top 10 through a conveyor 12, a throw-in hopper 13, etc., a raw material layer 24 is formed above the tuyeres 7 at a lower part of the furnace, and the inside of the shaft 5 is an empty tank 25. The distance (h) between the tuyeres 7 and a raw material charging surface 15 is approximately ≥1/2 of the height between the tuyeres 7 and the furnace top 10. Hot air is fed from the tuyeres 7 to form a raceway 8, and the iron is reduced to obtain the hot metal. The speed of the combustion gas is greatly reduced, and a large gas ash dust settling device is dispensed with.
KANEKO KOZO
YAGI JUNICHIRO
TAKAHASHI REIJIRO
KOJIMA KITOKU
