Power plant fans mainly refer to the three fans of power plant boilers - forced draft fan, induced draft fan and primary fan (or dust exhaust fan). They are one of the main auxiliary machines of thermal power plant, and their power consumption accounts for about 1.5% - 2.5% of the power generation capacity of the power plant. The safety and economy of their operation are directly related to the safe and economic operation of generator units and even the whole power plant.