为有效应对可再生能源并网引发的电网功率波动问题，燃煤机组在全面深度调峰中的参与需求日益增强。以某1000MW二次再热超超临界火电机组为研究对象，设计了6种主、再热蒸汽抽汽储热方案及2种释热方案，并基于Ebsilon软件构建了火电机组耦合熔盐储释热系统的热力工艺流程。通过对不同耦合方案下的冷源损失、调峰深度以及热、?效率等热力性能指标的分析，研究旨在通过多级换热与能量回收，充分利用蒸汽潜热，减少汽轮机冷源损失，从而更高效地达到机组低负荷条件下参与灵活深度调峰的目的。结果表明，抽取主蒸汽并在高压加热器两侧添加换热器的储热方案CC1耦合加热高压加热器入口给水的释热方案S2在全过程热效率和?效率方面均表现出最佳性能，分别达到45.01%和43.65%，且相对冷源损失最小，仅为51.27%。为未来火电机组的高效运行提供了新的思路与参考。

To address the power fluctuation posed by the integration of renewable energy,the demand for coal-fired units to participate in deep peak shaving is increasingly growing. Six schemes of molten salt heat storage and two schemes of heat release are proposed for a 1000 MW double reheating ultra-supercritical unit. The thermal process of the coal-fired unit coupled with a molten salt thermal energy storage and release system is constructed. The thermodynamic performance indicators, including cold source losses, load cycling depth, thermal and exergy efficiency were analyzed. The objective of the study is to optimize the utilization of steam latent heat through multi-stage heat exchange and energy recovery. This approach aims to minimize cold source losses in the steam turbine and improve the efficiency in flexible deep peak shaving under low load conditions. Finally, the heat storage scheme CC1, which extracts the main steam and adds heat exchangers on the side of the high-pressure heater, and the heat release scheme S2, which heats the feed water at the high-pressure heater inlet, were selected. The combination scheme CC1-S2 shows the best performance in the cyclic thermal efficiency and exergy efficiency, reaching 45.01 % and 43.65 % respectively. Also, the relative cold source loss is the least, which is only 51.27 %. A new idea and reference is provided for the efficient operation of thermal power units in the future.

低碳智能燃煤发电与超净排放全国重点实验室开放课题项目（课题编号: D2023FK086）