集成熔盐储热是有望大幅提高燃煤发电机组运行灵活性的有效手段。本文针对集成熔盐储热的燃煤发电系统，建立了变工况模型与火用分析模型，针对以再热蒸汽为热源且加热熔盐后分别返回低压缸入口和凝汽器的两种熔盐储热系统，研究获得了燃煤机组运行灵活性和能耗特性的变化规律。结果表明：采用不同储热系统构型对燃煤机组的灵活性与能耗特性的影响差异明显。集成两种熔盐储热系统，燃煤机组的最低工作负荷从额定负荷的30%分别降低到20.58%与24.43%，系统火用损失则分别增加了48.67 MW与18.7 MW。

Integration molten salt heat storage has been recognized as a promising technology to enhance the operational flexibility of coalfired power system. Variable condition and exergy analysis models were established for a coalfired power system integrated with molten salt heat storage, and the variation law of the operational flexibility and energy consumption characteristics of the coalfired power system was studied based on two molten salt heat storage systems with reheating steam as heat source which returned to lowpressure cylinder inlet and condenser rspectively after heating with molten salt. The results show that the effects of different molten salt heat storage system configurations on the operational flexibility and energy consumption characteristics of coalfired power system are different obviously. Integrating two molten salt heat storage systems allows the minimum working loads of coalfired power system to be reduced from 30% to 20.58% and 24.43% of the rated load respectively, and the system exergy losses are increased by 48.67 MW and 18.7 MW respectively.

国家自然科学基金项目（52276016）