燃煤电站耦合储热系统实现机炉解耦提升运行灵活性，是实现大规模可再生能源消纳的有效技术路径。以典型1000 MW超超临界燃煤机组为对象，以中低温烟气为热源，提出了常压水和加压水两种储热方案；采用EBSILON软件建立了燃煤电站耦合中低温储热系统仿真模型，研究了其热经济性和技术经济性。结果表明：储存常压水可使机组最低负荷降低40.32 MW，等效循环效率为64.59 %，度电成本为700.37元/MWh，不是单一储热的最佳选择；储存125-165℃加压水，可降低负荷7.93-16.56 MW，等效循环效率为67.15-73.14 %，当储存温度为145℃时，度电成本为662.42元/MWh，热力性能与技术经济性均优于常压水储存，是高效经济的辅助储热方式。

Improving the flexibility of coal-fired power plants is an effective means to achieve large-scale renewable energy consumption, decoupling of the machine and furnace in the coupled thermal storage system of coal-fired power stations can greatly improve the flexibility of coal-fired power stations. Taking a typical 1000 MW ultra-supercritical coal-fired unit as the subject, two thermal storage schemes—atmospheric water and pressurized water—were proposed using low-to-medium temperature flue gas as the heat source. A simulation model for the coal-fired power plant coupled with a low-to-medium temperature thermal storage system was established using EBSILON software, and its thermal and technical economic performance was investigated. The results show that the storage of atmospheric water can reduce the minimum load by 40.32 MW (4.03% of the total load), and the equivalent round-trip efficiency is 64.59%, levelized cost of electricity is 700.37 RMB/MWh, which is poor as the main heat storage method, while the storage of 125-165 °C pressure water can reduce the load by 7.93-16.56 MW, and the equivalent round-trip efficiency is 67.15-73.14%, levelized cost of electricity is 662.42 RMB/MWh when the storage temperature is 145 °C, the thermal performance and economy are better than that of atmospheric water storage, which can be used as an efficient and economical auxiliary heat storage method.

国家自然科学基金项目（面上项目，重点项目，重大项目）