Abstract
During recent years our open hearth furnaces have been improved on their construction & practice. The total heat consumption per ton of small ingot is reduced to 125×104 or 105×104 calories; equivalent to 120-100kg of heavy oil. The Heat from the coke oven gas account for 70% of the total heat & the remain is fed with fuel tar. Our furnaces could wark with liquid fuel only or gas & liquid fuel efficiently. The open hearth furnace efficiency depend on the several condition & facters, but the Size of cheeker chamber & chimney are considered of paramount importance for practice e.g. larger Size is better. The article describes our practical features & some investigation with many tables & figures.
