pulverized coal injection lance for blast furnace and method for operating blast furnace using it

摘要

The present invention relates to a pulverized coal injection lance for blast furnace and a blast furnace operating method using the same, the outer tube 10, the inner tube 23 inserted into the outer tube 10, and the outer tube 10 and the inner tube And a swirler 30 provided between 23. In addition, the appropriate range of the pulverized coal injection amount and the oxygen enrichment rate during the pulverized coal injection operation using the lance of the above configuration was confirmed. Therefore, by improving the dispersibility of pulverized coal, it is possible to increase the coke replacement amount of pulverized coal, thereby reducing the cost of molten iron production and reconsidering the efficiency of blast furnace operation.