燃煤发电机组的现有调峰能力难以满足日益增长的可再生能源发电容量。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以及可再生能源电力消纳能力进行分析。计算结果表明：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%)，1h储热时长条件下集成系统的最短释热时长为3.31h；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26.71 g/(kW·h)。

Coal-fired power plants (CFPPs) are required to improve peak shaving capacity due to the increasing renewable energy power generation capacity. To solve the consumption problem of excess renewable energy power generation, external renewable energy was introduced into the thermal energy storage (TES) system, and molten salt TES system heated by reheat steam and electric heater is integrated into CFPP. The thermodynamic performance and the renewable energy consumption capacity of the integrated system were analyzed with the case study of a 660MW supercritical CFPP. The results show that the maximum reheat steam split mass flow is 70.0 kg/s at a benchmark condition of 30%THA during the charging process, and the output power of CFPP can be maximumly reduced by 84.33MW (about 12.78% of the rated load), and the zero electric power output of CFPP can be achieved due to the power-to-heat process in electric heaters. In addition, the integrated system can also absorb excess renewable power with 955.21MW from the power grid. During the discharging process, the upward peak shaving capacity of 129.63MW (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 3.31h under the charging duration of 1h. For the cycle of charging and discharging process, the comprehensive standard coal consumption of power generation is reduced through energy storage of external renewable energy. With the renewable energy power consumed of 461.83 MW·h in 1 h, the comprehensive standard coal consumption of power generation can be reduced maximumly by 26.71 g/(kW·h).

国网河北省电力有限公司科技项目“新型灵活保效热电联供改造与运行优化技术研究”(TSS2022-02)