The calculation formula of the heating surface metal temperature for hot section of the regenerative air heater has been deduced from the heat transfer principle

the problems existing in calculation of minimum wall temperature being analysed

and methods for improvement being put forward.For differently designed regenerative air heaters of two 200 MW boilers in one coal-fired power plant

the acid dew point temperature

the minimum wall temperature of hot section

and the inlet air temperature have been calculated and compared.The proposed method and results can be used as reference for choosing the reasonable inlet air temperature and optimizing the designed proportion of cold and hot sections of the heating surface.