| 摘要 |
Provided is a method for operating a blast furnace in which further improvement in combustion temperature and further reduction of the specific consumption of reducing agents are possible. The mixture of a solid reducing agent and an inflammable reducing agent is injected through the same tube constituting a lance 4. For example, a solid reducing agent and an inflammable reducing agent are mixed and the mixture thereof is injected through a single tube lance 4. In addition, using a double tube lance 4 as the lance, while the mixture of a solid reducing agent and an inflammable reducing agent is injected through the inner tube of the double tube lance 4, a combustion improving gas is injected through the outer tube of the double tube lance. In addition, using a double tube lance 4 as the lance, while a combustion improving gas is injected through the inner tube of the double tube lance 4, the mixture of a solid reducing agent and an inflammable reducing agent is injected through the outer tube of the double tube lance. The solid reducing agent mainly consists of pulverized coal, and a utility gas, converter gas, blast furnace gas, coke oven gas and hydrogen are used as the inflammable reducing agent. O 2 is used as the combustion improving gas. |
