The purpose of an industrial furnace is to attain a higher processing temperature in comparison to open-air systems, as well as the efficiency gains of a closed system. Industrial furnaces typically deal with temperatures higher than 400 degrees Celsius.
An industrial furnace is an equipment used to provide heat for a process or can serve as reactor which provides heats of reaction. Furnace designs vary as to its function, heating duty, type of fuel and method of introducing combustion air.
Heat is generated by an industrial furnace by mixing fuel with air or oxygen, or from electrical energy. The residual heat will exit the furnace as flue gas.