基于熔盐储能的热电联产供汽扩容可行性研究OA
Feasibility study on steam supply expansion of combined heat and power based on molten salt energy storage
热电联产机组将部分做功后的蒸汽作为二次产品进行供暖或工业供汽,是一种深度节能减排的重要方式,但热电联产机组以热定电的运行方式限制了其深度调峰能力,熔盐储能技术能够提高机组运行灵活性,在一定程度上实现了热电解耦.以某660 MW带150 t/h,1.8 MPa,300℃供汽的发电机组为案例,采用EBSILON软件建模,对常规的热段再热蒸汽减温减压供汽方案进行优化,结合汽机侧的引射器与热网侧的熔盐装置,提出主蒸汽抽引热段再热蒸汽耦合熔盐供汽方案,热量在电价谷段储存,在电价峰段释放.结果表明:为提供150 t/h,1.8 MPa,300℃的工业用汽,原供汽方案机组发电功率运行区间为39.34%～94.08%汽轮机热耗率验收(THA)工况,耦合熔盐供汽方案机组发电功率运行区间为21.74%～99.17%THA,熔盐供汽方案扩大了供热安全运行边界、扩展了火电机组运行范围,为蓄热系统参与机组运行调度提供了参考.在典型日内,配置熔盐系统后增加的收益主要来自补偿收益与节煤收益,煤耗成本减少17.87 万元/d,新增补偿收益35.10万元/d,利润增加39.23万元/d,系统回收期为5.54 a.
Combined heat and power(CHP)units utilize part of the steam that has performed work as a secondary product for heating or industrial steam supply,which is an important approach for in-depth energy saving and emission reduction.However,the operation mode of CHP units—where power generation is determined by heat demand—limits their deep peak shaving capability.Molten salt energy storage technology can improve the operational flexibility of units and achieve heat-power decoupling to a certain extent.Therefore,a 660 MW power unit with a steam supply of 150 t/h(at 1.8 MPa and 300℃)was taken as the case study,and the EBSILON software was used for modeling to optimize the conventional steam supply scheme of desuperheating and depressurizing the hot reheat steam.By combining the ejector on the steam turbine side and the molten salt device on the heating network side,a steam supply scheme was proposed—namely,the main steam extraction-induced hot reheat steam coupled with molten salt.This scheme stored heat during the off-peak electricity price period and released the stored heat during the peak electricity price period.The results showed that to provide industrial steam supply of 150 t/h(at 1.8 MPa and 300℃),the power operation range of the units under the original steam supply scheme was 39.34%～94.08%turbine heat acceptance(THA),while that under the molten salt-coupled steam supply scheme was 21.74%～99.17%THA.The molten salt steam supply scheme not only broadened the safe operation boundary of heat supply,but also extended the operation range of thermal power units,thereby providing a reference for heat storage systems to participate in unit operation scheduling.On a typical day,the increased benefits after configuring the molten salt system mainly came from compensation benefits and coal-saving benefits.The coal consumption cost was reduced by 178 700 yuan per day,the new compensation benefits reached 351 000 yuan per day,the daily profit increased by 392 300 yuan,and the system payback period was 5.54 years.
张永剑;李彬;邢阁玉;孙俊鹏;徐钢;薛小军
中国电力工程顾问集团华北电力设计院有限公司,北京 100120国能河北沧东发电有限责任公司,河北 沧东 061113国能河北沧东发电有限责任公司,河北 沧东 061113华北电力大学 能源动力与机械工程学院,北京 102206华北电力大学 能源动力与机械工程学院,北京 102206山西大学 电力与建筑学院,太原 030006
能源科技
熔盐储能热电联产电力调峰仿真模型经济性分析灵活性改造
molten salt energy storagecombined heat and power generationpower peak shavingsimulation modeleconomic analysisflexibility retrofit
《综合智慧能源》 2026 (5)
74-82,9
国家自然科学基金项目(52406019) National Natural Science Foundation of China(52406019)
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