The integration of the molten salt Carnot battery energy storage system and coal-fired power plant is a significant technological advancement that enables large-scale renewable energy consumption and realizes the flexibility transformation of the unit. In this paper, the molten salt Carnot battery storage and power generation system is built in the EBSILON platform. The effects of key factors such as the circulating mass of the heat pump, the inlet and outlet temperatures of the compressor, and the temperature of the cold/heat source on the round-trip efficiency and exergy efficiency of the system are discussed. Then, the energy storage and heat pump systems are optimally designed for the given power generation. Finally, the economic performance of the molten salt Carnot battery energy storage and power generation system is analyzed using LCOE and payback period. The results show that the system has the highest round-trip efficiency when argon is used as the heat pump circulating medium. Appropriately reducing the heat inlet temperature of the heat source and increasing the inlet temperature of the cold source can effectively improve the round-trip efficiency of the system. When the flow rate of the argon circulating medium is 6780kg/s, the temperature of the cold source is 67℃, and the inlet temperature of the heat source is 290℃, the round-trip efficiency of the system can reach 57.46%. Under the condition that the charging tariff is 3¢/kWh medium charging tariff and the storage period is 12h, this retrofit system can realize about 4 years of payback investment period. This work offers strong theoretical backing for the design and evaluation of the Carnot battery system retrofit in retired power plants.

Ms.

Wen Qian