Reducing the Rate of Low-Temperature Corrosion of Regenerative Air Heaters of Steam Boilers

The article presents the results of calculating the temperature change of the metal plates of the packing of regenerative air heaters of boilers (RVP) for the period of one revolution of the rotor of the air heater. As object of research used RVP type VPR-7 type steam boiler PK-41. It is revealed that when the boiler operates on gas fuel heaters are disabled during low air temperature, a significant part of the metal plates of RVP has a temperature lower than the condensation temperature of water vapor of the flue gas. The recommendations on the required preheating temperature of the air in the considered mode of operation of the boiler and considered possible technical solutions to improve the coefficient of efficiency of the boiler by increasing the temperature of the air entering the RVP.