摘要
构建以新能源为主体的新型电力系统需要燃煤机组作为调峰电源,但传统燃煤机组调峰能力不足,熔盐储热技术可有效解决这一难题。本工作针对660 MW燃煤机组的供汽工况,提出了多蒸汽源协同抽汽蓄热的双罐和三罐熔盐储热系统,并使用Ebsilon软件建立了相应的仿真模型。本工作研究了双罐、三罐储热系统的热力学性能、调峰性能和技术经济性,基于热力学评价指标和经济性评价指标对2种系统进行了全面的对比分析,探究了供汽量对系统性能的影响,分析了调峰政策对储热系统经济性的影响。结果表明:三罐系统由于多温区储热、释热特性,优化了耦合系统的不可逆损失,其储热、释热过程的热效率和㶲效率均高于双罐系统;调峰性能方面,双罐系统在储热阶段更好,三罐系统在释热阶段更好;经济性方面,三罐系统的储能成本为0.568元/kWh,低于双罐系统的0.581元/kWh;供汽量每增加10 t/h,双罐和三罐系统全过程热效率的最高增长比为1.7%,全过程㶲效率的最高增长比为0.4%。综合分析结果得出,三罐系统总体上优于双罐系统。相关研究结果可为燃煤机组灵活性改造项目提供设计思路和理论依据。
To build a new power system with renewable energy as the main component,coal-fired units are required to serve as peak-shaving power sources.Conventional coal-fired units have insufficient peak-shaving capacities.The molten salt thermal energy storage technology can effectively address this issue.This study proposes a dual-tank and triple-tank molten salt thermal energy storage system with multi-steam-source coordinated extraction for a 660 MW coal-fired unit under steam supply conditions,and establishes corresponding simulation models using Ebsilon software.The study investigates the thermodynamic performance,peak-shaving performance,and technical economy of the dual-tank and triple-tank storage systems.A comprehensive comparative analysis is conducted based on thermodynamic and economic evaluation indicators.The impact of steam supply on the system's performance and the effect of peak-shaving policy fluctuations on the economic performance of the storage systems are explored.The results indicate that,owing to its multi-temperature zone heat storage and heat release characteristics,the triple-tank system,optimizes the irreversible losses of the coupled system,with its heat storage efficiency,heat release efficiencies,and exergy efficiency higher than that of the dual-tank system.In terms of peak-shaving performance,the dual-tank system performs better during the heat storage phase,whereas the triple-tank system performs better during the heat release phase.In terms of economic performance,the energy storage cost of the triple-tank system is 0.568 CNY/kWh,which is lower than that of the dual-tank system(0.581 CNY/kWh).With each additional 10 t/h of steam supply,the maximum increase in the overall thermal efficiency of both the dual-tank and triple-tank systems is 1.7%,and the maximum increase in the overall exergy efficiency is 0.4%.The comprehensive analysis concludes that the triple-tank system is superior to the dual-tank system.The research results can provide design ideas and theoretical basis for flexibility transformation projects of coal-fired power units.
作者
杨灿
胡丽娜
魏俊
刘威
杨竟骁
张启帆
YANG Can;HU Lina;WEI Jun;LIU Wei;YANG Jingxiao;ZHANG Qifan(School of Electrical Engineering,Xinjiang University,Urumqi 830017,Xinjiang,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)
出处
《储能科学与技术》
北大核心
2025年第12期4795-4809,共15页
Energy Storage Science and Technology
基金
新疆维吾尔自治区重大专项计划项目(2023A01005-1)
新疆碳中和能源科学与技术研究项目(2022TSYCLJ0001)。
关键词
熔盐储热
三罐系统
双罐系统
调峰性能
经济性
molten salt thermal energy storage
triple-tank system
dual-tank system
peak shaving
economic performance
