| 摘要 |
PURPOSE:To decrease the amt. of the costly coke for a blast furnace to be used and to stabilize a blast furnace operation by forming a pulverized coal blowing nozzle at the tuyere of the blast furnace into specific double constructions for the pulverized coal and oxygen and blowing a specific amt. or above of the pulverized coal by said nozzle. CONSTITUTION:The pulverized coal blowing nozzle 11 provided in the tuyere 1 of the blast furnace is constituted of the pulverized coal blowing part 12 and the oxygen blowing part 13 formed on the outside thereof and is horizontally installed in a blast branch pipe 3 for hot wind. The top end of the oxygen blowing part 13 is closed and is provided with blowing holes 16 at 3 points. The pulverized coal of >=150kg per ton of a molten iron is blown at >=30% oxygen concn. during blasting while the distance between the top end of the pulverized coal blowing nozzle made into the double construction for the pulverized coal and oxygen and the top end of the blast furnace tuyere is maintained at <=300mm. The use amt. of the costly coke for the blast furnace to be supplied from the blast furnace top is reduced and the cost of producing the molten iron is reduced. |
