Thermal power generation is a high-energy-consuming industry

in which auxiliary power accounts for a large proportion of expenditure costs. By taking several subcritical 300 MW and supercritical 350 MW circulating fluidized bed(CFB) units as the research objects

this paper compares the equipment configuration and layout of each power plant and digs the reasons for low auxiliary power consumption. The results show that

taking the HP supercritical 350 MW CFB unit as the example

the three equipments that consumes the largest proportion of auxiliary power are induced draft fan

primary fan and slurry circulating pump. At low and medium load

the steamdriven induced draft fan is relatively more energy-saving

and it has multiple advantages in combination with indirect air cooling. The centrifugal fan with variable frequency has significant energy saving advantages at low load. The power consumption of different types of fans is related to the operation mode. When the fan is adjusted by the inlet baffle

the power consumption of a single fan is relatively low

and when the frequency conversion is adopted

the load of the parallel fans is evenly distributed to save power. Big ash bucket design can reduce the number of air compressors to realize energy conservation. The system power consumption of semi-dry desulfurization is lower than that of wet desulfurization at medium and high load. The primary fan's current can be significantly reduced by reducing the chamber pressure through flow pattern reconstruction. The research results of this paper have reference value for CFB units participating in deep peak load regulation..