To meet the demands of accuracy and reliability for controlled model of the coordinated control system

a method of calculating heat storage coefficient through boiler design data was proposed.In this method

the boiler steam-water system is divided into eight endothermic segments

according to heat storage ability and phase change of the working fluid.The steam-water heat storage coefficient and the heat storage coefficient of metallic material of each segment are calculated.Then

combining with the boiler design data

the total heat storage coefficient can be obtained.Finally

this method was applied on a supercritical 660 MW unit once-through boiler.The results show that

the heat storage coefficient of this boiler is about 4 000 MJ/MPa and the percentage of heat storage of metallic material is above 60%

which is larger than that of the steam-water heat storage.Compared with the data obtained

for once-through boiler

the heat storage coefficient per unit power load decreases with the increase of boiler capacity

and the heat storage coefficient per unit power load of drum boiler is higher than that of the once-through boiler.