| 摘要 |
PROBLEM TO BE SOLVED: To provide a blow-pipe configuration of a blast furnace apparatus that is simple in configuration and can suppress the adhesion of slag even in the case where powdered coal without softening point adjustment is used.SOLUTION: A blow-pipe configuration, which is attached to a tuyere 22 of a blast furnace body 20 producing pig iron from iron ore, to blow therein supplementary fuel of powdered coal 3 together with hot air 2, and in which the slag of powdered coal 3 comprises a constituent that fuses by hot air 2 and/or combustion heat of powdered coal 3, has resistive elements 80 for converging the flow of hot air 2 and powdered coal 3 about the center of flow path axis by increasing the flow path resistance on the side of a pipe inner wall surface, on the downstream side of an injection lance 31 for charging powdered coal 3 into a blow-pipe 30. |
