The non-oxidizing zone is consisted of entry sealed room, waste gas preheating zone, direct heating zone, and furnace nozzle and flue gas exhausting system.

After scaling the boiler flue gas temperature will increase, reducing the efficiency of the boiler heating, coal consumption increased.

This paper introduces the plan, equipment and effects of utilizing waste heat of flue gases of reheating furnace for second heating of heavy oil to improve the combustion conditions.