| 摘要 |
PURPOSE:To uniformly transfer the combustion heat of CO generated from a molten iron to the molten iron in the stage of producing the molten from iron ore with an oxygen top blown converter by blowing the oxygen from plural nozzles provided under the molten iron surface toward the direction inclined in the axial direction of the converter. CONSTITUTION:The molten iron 2 is thrown into the oxygen top blown converter 1 and gaseous O2 is ejected from an upper lance 3; at the same time, the iron ore and coal which is a reducing agent are thrown into the converter to reduce the iron ore to the molten iron. The gaseous O2 is injected from the plural nozzles 4a-4n provided under the molten iron bath surface 2a in the direction inclined from the central axis of the converter 1. The CO-contg. gas generated by the decarburization reaction of the molten iron 2 is burned in a secondary combustion zone 6 by the O2 from the lance 3 and the generated heat is transferred to the liquid drops 5 of the molten slag and molten iron formed by the oxygen ejected from nozzles 4a-4n to heat the molten iron 2. Since the nozzles 4a-4n are inclined, the flying distance of the liquid drops of the molten slag and molten iron is long and the heat of the secondary combustion zone 6 is efficiently transferred to the molten iron 2, by which the thermal efficiency is improved and the amt. of coal to be used can be reduced. |
