关键词: 燃煤发电机组, 高温熔盐, 储能系统, 灵活性, 调峰

Abstract:

Under the promotion of the "dual carbon" target, the installed capacity and power generation of renewable energy in China have steadily increased, and molten salt energy storage technology plays a key role in supporting the integration of new energy and balancing power grid fluctuations. In the new energy system, thermal power units not only bear the basic power supply, but also need to have the flexibility of peak shaving to adapt to the volatility of renewable energy generation. To significantly enhance the peak shaving and frequency regulation capabilities of thermal power plants, the coupling between molten salt thermal storage systems and steam water systems of thermal power units has become an important approach. This article summarizes the key technologies and research progress of molten salt thermal storage coupled thermal power unit systems, compares the thermal properties, application scope, and existing problems of different molten salt thermal storage materials, and elaborates on the research status and future development directions of key components of thermal storage systems. Analyzed the coupling methods of molten salt thermal storage systems and compared the advantages and disadvantages of different methods. And an analysis was conducted on the economy of the molten salt thermal storage coupled thermal power system, and suggestions were proposed to improve the economic efficiency of the design scheme. Finally, the application prospects of molten salt thermal storage systems in thermal power units were discussed, which can provide some reference for the flexible operation of coal-fired power generation units.

Key words:  coal-fired generating units; high temperature molten salt, energy storage system, flexibility, peaking