Air cooling of the hearth bottom of No. 2 blast furnace

Summary

• 1. The air-cooling system of the hearth bottom resulted in a substantial drop and equalization of the temperature of the lower part of the hearth bottom and of the foundation of the furnace.

• 2. The small change in air temperature indicares that it is possible to lower the output of the blowers used.

• 3. The relatively rapid deterioration of the upper rows in the hearth bottom indicates that with underbottom cooling it will be advantageous to reduce the thickness of the hearth bottom considerably.