Thermodynamic and economic analyses of a novel liquid carbon dioxide energy storage system incorporated with a coal-fired power plant

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2025-04-17 DOI:10.1016/j.energy.2025.136212

Lixing Zheng , Yongqiang Li , Yixiong Mao , Xiaojun Xue , Gang Xu , Xiao Lin

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引用次数: 0

Abstract

Liquid carbon dioxide energy storage (LCES) system is a promising technology for large-scale energy storage due to its small footprint and flexible operation, but is limited by low cycle efficiency. In order to effectively improve the efficiency of the LCES system, this paper proposes a design of integrating the system with a coal-fired power plant (CFPP). Based on the principle of energy cascade utilization, the condensate of CFPP directly recover the heat of compression in LCES system, whereas the condensate and feedwater of CFPP provide preheating when high-pressure CO₂ is introduced to the turbine input. The system performance is evaluated through energy, exergy, economic, and environmental (4E) analyses. According to the results, LCES system has a round-trip efficiency of 60.65 %, with an increase of 2.48 %, an exergy efficiency of 76.56 %, and an energy storage density of 16.38 kWh/m³. Furthermore, LCES system reveals a dynamic payback period of 6.71 years and a net present value of 10,403 k$. In a cycle process, the emission of CO₂ and SO₂ reduce by 183 ton and 4.97 ton. In addition, a sensitivity analysis is conducted to analyze the influence of the main parameters on the performance of the system.

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燃煤电厂新型液态二氧化碳储能系统的热力学和经济性分析

液态二氧化碳储能系统具有占地面积小、操作灵活等优点，是一种很有前途的大规模储能技术，但其循环效率较低。为了有效地提高LCES系统的效率，本文提出了一种与燃煤电厂（CFPP）集成的系统设计。基于能量梯级利用原理，CFPP的冷凝水直接回收LCES系统的压缩热，而CFPP的冷凝水和给水在高压CO2引入汽轮机输入时提供预热。系统性能通过能源、能源、经济和环境（4E）分析来评估。结果表明，LCES系统的往返效率为60.65%，提高了2.48%，火用效率为76.56%，储能密度为16.38 kWh/m3。此外，LCES系统的动态投资回收期为6.71年，净现值为10,403 k美元。在一个循环过程中，CO2和SO2的排放量分别减少183吨和4.97吨。此外，还进行了灵敏度分析，分析了主要参数对系统性能的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.