The efficiency of industrial fuel, gas and coal-fired boilers is about 70%. In the waste heat, the flue gas heat accounts for the majority. Normally steam and hot water boiler flue gas temperature at 200 DEG C, the exhaust gas temperature above 280 DEG C in the furnace tail -350 C, the use of waste heat recovery equipment is waste heat boiler of the heat recovery, can be used to improve the boiler water temperature, air temperature or directly produce steam for production and living with gas