Modeling and Performance Analysis of Molten Salt Energy Storage System in the Flexibility Retrofit of Coal-fired Power Plant

A nonlinear dynamic mathematical model of the steam generation system was established for the molten salt energy storage system applicable to coal-fired power plants. The dynamic characteristics of the system under various disturbances were explored, and the accuracy of the model was verified. Results show that in the static experiment, the maximum error between the simulation results and the design values of the three heat exchanger models in the steam generation system was only 1.03 under rated conditions. The static performance of the steam generation system under different heat loads has also been verified, with maximum and minimum absolute error of 0.85 and 0.01, respectively. In dynamic experiments, the change in inlet temperature of molten salt has the greatest impact on the steam mass flow rate at the outlet of the steam generation system, followed by the change in molten salt mass flow rate.