Soft measurement method for calculating temperature of boiler after cold reheating temperature reduction through temperature reduction water flow

The invention provides a soft measurement method for calculating the temperature of a boiler after cold reheating temperature reduction through temperature reduction water flow, and belongs to the technical field of thermal power boilers. According to the method, the temperature value after the theoretical temperature of the cold reheating desuperheater is calculated according to the load of a current unit and the flow of cold reheating desuperheating water. Exhaust steam of a turbine high-pressure cylinder enters a boiler cold reheater, and due to the fact that the reheating temperature is low at the moment, the temperature difference between the exhaust steam and desuperheating water is small, vaporization of the desuperheating water is not facilitated; in addition, the reheater is small in front-and-back pressure difference, the steam flow speed is low, most of the steam flow is in a laminar flow state, and steam-water sufficient mixing is not facilitated. Therefore, under the normal condition, the tempera