摘要
集成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。本文设计了以燃煤机组再热蒸汽为热源的储热系统,分析了储热系统设计的关键限制因素,建立了系统性能分析模型,研究了不同储热/放热速率下集成系统运行灵活性以及能质损失规律。结果表明:在锅炉保持稳定燃烧的情况下,集成储热系统使燃煤机组的最低电负荷从额定负荷的30%降低到17.64%,此时储热系统循环效率为64.98%。燃煤机组集成储热产生附加损,而附加损随着储热速率的降低而减小,熔盐换热器与凝汽器分别在储热过程与放热过程中具有最大的附加损占比。
Integrated heat storage is an effective way to greatly improve the operation flexibility of coal-fired power plants.In this paper,a molten salt heat storage system extracting heat from the reheat steam of a coal-fired power plant is designed.The key limiting factors of heat storage system design are analyzed.Thermodynamic analysis model is established.The operation fexibility and energy quality loss of integrated system under dfferent heat storage/heat release rates are studied.The results show that when the boiler maintains stable combustion,the integration of heat storage system reduces the minimum electric load of the coal-fired power plant from 30%of the rated load to 17.64%,and the round-trip efficiency of the heat storage system is 64.98%.The integration of heat storage in the coal-fired power plant produces additional exergy loss,which decreases with the decrease of heat storage rate.The molten salt heat exchanger and condenser have the largest proportion of additional exergy loss in the heat storage process and the heat release process,respectively.
作者
张可臻
刘明
赵永亮
严俊杰
ZHANG Kezhen;LIU Ming;ZHAO Yongliang;YAN Junjie(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《工程热物理学报》
EI
CSCD
北大核心
2023年第9期2331-2339,共9页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.52022079)
中央高校基本科研业务费专项资金资助(No.xzy022021018)
华能集团总部科技项目‘HNKJ20-H87技术研究’。
关键词
燃煤机组
储热
?分析
运行灵活性
coal-fired power plants
heat storage
exergy analysis
operational flexibility
