The integrated system of regasification of liquefied natural gas (LNG) and liquid air energy storage (LAES) has advantages of improving the LAES system efficiency and energy grade matching utilization of the LNG cold energy. But the influence of the cold energy storage efficiency on the combined system is ambiguous and the decoupling mechanism between the energy storage and release processes with the addition of the LNG cold energy was seldom investigated. Thus, a hybrid LAES system using LNG is proposed. The thermodynamic model is established to analyze the system performance. The influence of key parameters on the system and the removal of the coupling effect are originally analyzed. The results show that the electricity storage efficiency ( ${\eta }_{\text{ese}}$) and exergy efficiency ( ${\eta }_{\text{exe}}$) of the typical operational condition can reach 107.3% and 49.4%, respectively. With the cold energy storage efficiency varying from 0% to 100%, the ${\eta }_{\text{ese}}$ and ${\eta }_{\text{exe}}$ increase by 18.0% and 4.4% averagely. Furthermore, to investigate the influence mechanism of introducing LNG to the LAES system, the performance of four different systems is compared. With the decoupling between the energy storage and release processes, the ${\eta }_{\text{ese}}$ is improved obviously and the ${\eta }_{\text{exe}}$ can be maintained at a high level.

中文翻译：

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基于液化天然气终端液化天然气储能系统的调峰电站热力学分析

液化天然气（LNG）和液化空气储能（LAES）的再气化的集成系统具有提高LAES系统效率和LNG冷能的能量等级匹配利用的优点。但是冷能存储效率对组合系统的影响是模棱两可的，并且很少研究能量存储和释放过程之间的耦合机理以及添加LNG冷能的过程。因此，提出了使用LNG的混合LAES系统。建立热力学模型以分析系统性能。最初分析了关键参数对系统的影响以及耦合效应的消除。结果表明，蓄电效率（${\eta }_{\text{ese}}$）和火用效率（ ${\eta }_{\text{可执行程序}}$）的典型运行条件分别可以达到107.3％和49.4％。随着冷能存储效率从0％到100％不等，${\eta }_{\text{ese}}$ 和 ${\eta }_{\text{可执行程序}}$平均分别增长18.0％和4.4％。此外，为了研究将LNG引入LAES系统的影响机制，比较了四种不同系统的性能。随着能量存储和释放过程之间的解耦，${\eta }_{\text{ese}}$ 明显改善了， ${\eta }_{\text{可执行程序}}$ 可以保持较高的水平。