In this paper,the influence on the boiler efficiency from the operation of air heater was analyzed.

The surge alarm of the axial-flow forced fan on Side B of Unit 2 boiler in Zhuhai Power Station is analyzed,and the root cause is deemed to be the blockage of the air heater that increased the resistance in the air duct.

To cope with the excessive rise in exhaust gas temperature after the modification of the air heater of a 670 t/h boiler installed at Shengli Power Plant, it is decided to implement a technical scheme of adding a split-body heat-pipe warm-air heater.

The steam air heater is often used for preventing low-temperature corrosion and ash clogging in the boiler,but different influence upon economic efficiency of unit in operation may be resulted by different parameters of the said steam air heater.

Through analysis of operation parameters concerning the fan and inspection of the secondary air system,it is believed that the main cause was the increase of steam air heater s resistance,making the resistance in secondary air system of the boiler to be increased.

Constructional character and problems in coiled steam air heater of coal-fired boilers is analyzed and a thinking of new type of tube in tube air heater is proposed.

The use of power boiler air heaters is being discussed, as well as the necessity of its automatic control and its economy.

To solve the problem about the drain pump of boiler air heater during the operation of 600MW unit in Datong Power Generation Co.

trofit of drainage system of steam air heater in fossil-fired power plant;