Use of Exhaust Waste Energy as Essential Element of Heat Economy in Furnaces Heating Steel Charge

The article presents the possibilities of using exhaust waste heat to preheat the combustion air in furnaces for heating steel charge. Calculations illustrating the effect of combustion air temperature on the amount of heat introduced into the heating process were demonstrated. The basic and supporting calculations of the combustion process using authorial computer programs were carried out. The influence of recuperation on the heat economy in heating units was presented. For the selected heating furnaces, analysis of the savings resulting from the use of heated combustion air was conducted.