A waste heat boiler is a boiler that generates steam or hot water by utilizing gases, exhaust gases, and waste liquids from industrial production processes, as well as the heat from exhaust gases of certain power machinery. The waste heat boiler is an important energy-saving equipment. The exhaust temperature of various smelting furnaces and roasting kilns is 650-1250 ℃; The exhaust temperature of power machinery such as gas turbines and diesel engines is 370-540 ℃. Installing a waste heat boiler to absorb some of the heat from these exhaust gases can significantly improve the utilization rate of the entire system. For example, after installing a waste heat boiler in a steel rolling heating furnace, the overall utilization rate of the system can even be increased by about twice.