退役燃煤发电机组耦合卡诺电池并网储能改造研究

IF 11 1区工程技术 Q1 ENERGY & FUELS

Applied Energy Pub Date : 2025-09-26 DOI:10.1016/j.apenergy.2025.126796

Binghui Li , Wen Qian , Xiaoze Du

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引用次数: 0

摘要

本研究探讨了通过集成卡诺电池将退役燃煤电厂改造成长时间储能系统。提出的系统将高温热泵、双罐熔盐热能储存和原始汽轮机耦合在一起，形成一个闭环的电-热-电通路，从而充分利用现有基础设施。建立了详细的热力学模型，以评估系统在不同工作流体和操作条件下的性能。结果表明，在中等压缩比下，氩气具有最高的往返效率（59.67%），而CO₂具有更高的体积功率密度。火用分析和敏感性分析表明，主要的不可逆性发生在熔盐蒸发器和热泵子系统中。为了增强系统对可变条件的适应能力，提出了一种基于matlab - ebsiln的闭环控制策略，使系统的火用损失降低了16.2%，提高了部分负荷效率。技术经济评价：年套利利润7701万美元，投资回收期6.39年，平准化储能成本149.09美元/兆瓦时，显著低于主流电池技术。这些发现证实了拟议系统强大的技术和经济可行性，为重新利用燃煤电厂和推进低碳能源转型提供了可扩展的途径。

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Study on the retrofit of coupled Carnot battery in retired coal-fired power units for grid energy storage transformation

This study investigates the retrofitting of decommissioned coal-fired power plants into long-duration energy storage systems by integrating a Carnot battery. The proposed system couples a high-temperature heat pump, two-tank molten salt thermal energy storage, and the original steam turbine to form a closed-loop electricity–heat–electricity pathway, enabling full reuse of existing infrastructure. A detailed thermodynamic model is developed to evaluate the system's performance under varying working fluids and operating conditions. Results show that argon achieves the highest round-trip efficiency (59.67 %) at a moderate compression ratio, while CO₂ offers superior volumetric power density. Exergy and sensitivity analyses reveal that major irreversibilities occur in the molten salt evaporator and heat pump subsystems. To enhance adaptability under variable conditions, a MATLAB–EBSILON-based closed-loop control strategy is proposed, which reduces exergy losses by up to 16.2 % and improves part-load efficiency. Techno-economic evaluation indicates an annual arbitrage profit of USD 77.01 million, a payback period of 6.39 years, and a levelized cost of storage of 149.09 USD/MWh, significantly lower than mainstream battery technologies. These findings confirm the strong technical and economic viability of the proposed system, offering a scalable pathway for repurposing coal-fired plants and advancing the low-carbon energy transition.

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来源期刊

Applied Energy 工程技术-工程：化工

CiteScore

21.20

自引率

10.70%

发文量

1830

审稿时长

41 days

期刊介绍： Applied Energy serves as a platform for sharing innovations, research, development, and demonstrations in energy conversion, conservation, and sustainable energy systems. The journal covers topics such as optimal energy resource use, environmental pollutant mitigation, and energy process analysis. It welcomes original papers, review articles, technical notes, and letters to the editor. Authors are encouraged to submit manuscripts that bridge the gap between research, development, and implementation. The journal addresses a wide spectrum of topics, including fossil and renewable energy technologies, energy economics, and environmental impacts. Applied Energy also explores modeling and forecasting, conservation strategies, and the social and economic implications of energy policies, including climate change mitigation. It is complemented by the open-access journal Advances in Applied Energy.