600MW凝汽式机组熔盐储热系统设计及经济性分析OA
Design and economic analysis of molten salt thermal storage system for 600 MW condensing unit
为实现"双碳"目标下火电机组的深度调峰与灵活运行,提升大功率凝汽式机组的电网适应性,针对一台600 MW凝汽式机组,开展熔盐储热系统的耦合设计与经济性分析,旨在提出一种兼顾调峰能力与热经济性的技术改造方案.基于EBSILON软件构建机组热力系统仿真模型,并验证了其准确性.提出2种抽汽储热方案:方案1抽取再热蒸汽,方案2抽取主蒸汽.在额定工况下,以90 MW储热负荷为基础,建立储热-释热耦合系统模型,并从调峰容量、全厂热效率、绝对电效率、系统循环效率及工程适用性5个维度进行对比分析.结合河北省峰谷电价政策,估算系统的日均收益与静态投资回收期.仿真结果表明:方案1与方案2的调峰容量分别为38.85 MW与54.70 MW;系统循环效率分别为84.6%与60.1%;在典型峰谷电价下,方案1与方案2的日均净收益分别为9.81万元与7.05万元;静态投资回收期分别为2.08 a与3.53 a.方案1在系统循环效率、绝对电效率及经济性等方面均表现更优.对于大功率凝汽式机组的熔盐储热改造,抽取再热蒸汽的方案在保证显著调峰能力的同时,具有更优的热经济性与更短的投资回收期,综合性能更佳,可作为同类机组灵活性改造的推荐技术路线.
To achieve deep peak shaving and flexible operation of thermal power units under the"dual carbon"goals and to enhance the grid adaptability of high-capacity pure condensing units,a coupled design and economic analysis of a molten salt heat storage system for a 600 MW condensing unit is conducted.The aim is to propose a technical retrofit scheme that balances peak-shaving capability and thermal economy.A thermodynamic system simulation model of the unit was established based on the EBSILON software,and its accuracy was verified.Two steam extraction and heat storage schemes were proposed.Scheme 1 extracted reheated steam,and scheme 2 extracted main steam.Under rated operating conditions,and based on a heat storage load of 90 MW,a coupled heat storage and release system model was established.A comparative analysis was carried out across five dimensions:peak-shaving capacity,overall plant heat efficiency,absolute electrical efficiency,system cycle efficiency,and engineering applicability.Combined with the peak-valley electricity price policy in Hebei Province,the average daily revenue and static investment payback period of the system were estimated.The simulation results showed that the peak-shaving capacities of scheme 1 and scheme 2 were 38.85 MW and 54.70 MW,respectively,and the system cycle efficiencies were 84.6%and 60.1%,respectively.Under typical peak-valley electricity prices,the average daily net revenues of scheme 1 and scheme 2 were 98 100 yuan and 70 500 yuan,respectively.The static investment payback periods were 2.08 years and 3.53 years,respectively.Scheme 1 demonstrated more excellent performance in terms of system cycle efficiency,absolute electrical efficiency,and economic performance.For the molten salt heat storage retrofit of high-capacity condensing units,the scheme extracting reheated steam ensured significant peak-shaving capability while possessing better thermal economic performance and a shorter investment payback period.With better comprehensive performance,it can be recommended as a technical route for the flexibility retrofit of similar units.
岳柏杨;耿士敏;程思远
河北科技大学 机械工程学院,石家庄 050018河北科技大学 机械工程学院,石家庄 050018河北科技大学 机械工程学院,石家庄 050018
能源科技
凝汽式机组灵活性改造熔盐储热仿真模拟经济性分析
condensing unitflexibility retrofitmolten salt heat storagesimulationeconomic analysis
《综合智慧能源》 2026 (5)
64-73,10
国家自然科学基金项目(52206224)河北省教育厅青年拔尖人才项目(BJK2024030) National Natural Science Foundation of China(52206224)Youth Top-notch Talent Project of Hebei Provincial Department of Education(BJK2024030)
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