Blast furnace and method of operation.

摘要

A blast furnace having a cooling device between its hearth bottom and its foundation. The cooling device includes top and bottom groups of cooling fluid passages with a heat-insulating layer disposed therebetween, the top and bottom groups having independently regulable cooling capacities. Also provided is a method for operating a blast furnace including the steps of measuring a temperature in the hearth bottom, and controlling the cooling of the hearth bottom so that the specification point of the molten product in the hearth bottom maintains a predetermined level.