| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for operating a blast furnace by which the reduction material ratio of a furnace can be reduced while preventing the permeability of the blast furnace from being deteriorated when injecting partially reduced ore from a tuyere in the blast furnace. SOLUTION: In the blast furnace operation method, by which auxiliary fuel and the partially reduced iron ore are injected together with hot blast from the tuyere part in the blast furnace, the reduction rate of the iron ore is 40-80%, and the iron ore is injected to the hot blast from the downstream side than the auxiliary fuel. Alternatively, in the blast furnace operation method by which the auxiliary fuel and the partially reduced iron ore are injected from the tuyere part in the blast furnace through a lance inserted into a blowing pipe connected to the tuyere, the reducing ratio of the iron ore is 40-80%, and the lance has a double pipe structure composed of an inner pipe and an outer pipe, ther4eby injecting the iron ore and the auxiliary fuel from the outer pipe. COPYRIGHT: (C)2007,JPO&INPIT
|
