燃煤机组集成双热源熔盐储热消纳可再生能源发电研究  

Research on Renewable Energy Consumption by Coal-fired Power Plants Integrated with Two Heat Sources Molten Salt Thermal Energy Storage System

作　　者：唐广通 杨海生 吴瑞涛 李路江 TANG Guangtong;YANG Haisheng;WU Ruitao;LI Lujiang(State Grid Hebei Energy Technology Service Co.,Ltd.,Shijiazhuang,China,050021)

机构地区：[1]国网河北能源技术服务有限公司,河北石家庄050021

出　　处：《热能动力工程》2025年第1期76-84,共9页Journal of Engineering for Thermal Energy and Power

基　　金：国网河北省电力有限公司科技项目(TSS2022-02)。

摘　　要：为解决过剩可再生能源发电的消纳问题,在熔盐储热系统中引入外部可再生能源电力,针对燃煤发电机组集成双热源(分流再热蒸汽和电加热)的熔盐储热系统开展研究,并结合660 MW超临界机组案例对集成系统的热力学性能及可再生能源电力消纳能力进行分析。研究结果表明:储热过程中以30%THA为基准工况,最大再热蒸汽分流流量为70.0 kg/s,通过分流再热蒸汽储热获得的燃煤发电机组最大输出功率降低量为84.33 MW(占额定负荷的12.78%),而增加电加热储热后,实现燃煤发电机组零电功率输出,同时还可消纳电网富裕可再生电力955.21 MW;释热过程中以75%THA为基准工况,集成系统的最大向上附加调峰容量为129.63 MW(占额定负荷的19.64%),1 h储热时长条件下集成系统的最短释热时长为3.31 h;在储释热循环过程中,集成系统综合发电标准煤耗有所降低,单位时间消纳的可再生能源电力为461.83 MW·h时,系统综合发电标准煤耗最大可降低26.71g/(kW·h)。To solve the consumption problem of excess renewable energy power generation,external re-newable energy was introduced into the molten salt thermal energy storage(TES)system.The molten salt TES system heated by two heat sources,such as split reheat steam and electric heater,integrated into coal-fired power plant(CFPP)was studied.The thermodynamic performance and the renewable energy consumption capacity of the integrated system were analyzed based on the case study of a 660 MW super-critical CFPP.The research results show that the maximum split mass flow of reheat steam is 70.0 kg/s at a benchmark condition of 30%THA during the thermal energy storage process.The maximum output power of CFPP can be reduced by 84.33 MW(accounting for about 12.78%of the rated load)by split-ting reheat steam,and the zero electric power output of CFPP can be achieved after adding electric heat-er.Meanwhile,the integrated system can also absorb excess renewable power of 955.21 MW from the power grid.During the discharging process,the maximum upward additional peak shaving capacity of in-tegrated system of 129.63 MW(accounting for about 19.64%of the rated load)can be achieved at a benchmark condition of 75%THA,and the shortest discharging duration of the integrated system is 3.31 hours under the condition of heat storage duration for 1 hour.For the cycle of charging and discharging process,the comprehensive standard coal consumption of power generation of integrated system is re-duced.With the renewable energy power consumed of 461.83 MW·h in 1 hour,the comprehensive standard coal consumption of power generation can be reduced by 26.71 g/(kW·h)at most.

关 键 词：机组灵活性 多热源 熔盐储热 深度调峰 可再生能源消纳 

分 类 号：TK219[动力工程及工程热物理—动力机械及工程]