This paper firstly constructs a physical model of thermal power generation units

and compares the calculated data of the model with the design data of THA

75% THA

and 50% THA operating condition of 300MW units to verify the accuracy of the model. Then

the ternary molten salt is used as the heat storage molten salt. After comparing multiple combined conditions of heat storage and release

the optimal working condition of the heat storage process is to extract the main steam and heating the condensate

and the optimal working condition of the heat release process is to directly produce steam by molten salt. Finally

taking the subcritical 300 MW reheating heating unit as an example

the scheme design and technical and economic evaluation of the molten salt heat storage system are carried out. The results showed that according to the peak shaving auxiliary service rules of Fujian Province

with an average load rate of 50% and an average peak shaving compensation price of 0.2 yuan/kWh

the total investment of the molten salt heat storage system is about 38.7 million yuan

and the static investment recovery period is about 21.2 years.