Abstract: At present, with the development of the urban economy, the heating area of Hohhot has increased year by year. At the same time, the small coal-fired boilers in the urban area are being demolished gradually due to the problems of high coal consumption and heavy pollution. Therefore, in order to meet the needs of heat users in Hohhot, we will maximize the heating potential of thermal power plants and upgrade the flue gas waste heat system of two units of our company. After the transformation, we can not only fully recover the flue gas waste heat, At the same time, it can reduce the auxiliary power consumption by about 3000kwh every day, and solve the steam collection problem of the flue gas waste heat device, making the system operation safer and more stable.。