Patent ID: 9650689
Date: 2017-05-16
CPC Classifications: C21B

Claim:
1. A method of operating a blast furnace comprising: providing two or more lances that inject reducing agents from a tuyere; injecting a solid reducing agent and a flammable reducing agent from different lances; and disposing the lances so that an axial line that extends in an injecting direction from an end of the lance that injects the solid reducing agent and is the axial line of the lance that injects the solid reducing agent and an axial line that extends in an injecting direction from an end of the lance that injects the flammable reducing agent and is the axial line of the lance that injects the flammable reducing agent cross each other, and so that a main flow of the solid reducing agent injected and a main flow of the flammable reducing agent injected overlap, wherein the lances are aligned in an injecting direction, or the end of the lance that injects the flammable reducing agent is disposed closer to a near side than the end of the lance that injects the solid reducing agent in the injecting direction.