【摘要】 液化空气储能（LAES）技术因其储能密度高、不受地理条件限制等优点，在平抑可再生能源电力的间歇性和波动性等方面表现出色。太阳能作为一种清洁的可再生能源，可有效提升液化空气储能系统的热力学性能。基于Mg（OH）₂/MgO热化学热反应体系，本文提出一种新型耦合太阳能的液化空气储能（LAES）系统。其在释能阶段，空气在进入透平做功发电前所吸收的热量不仅来源于储能阶段产生的空气间冷压缩热，也来源于太阳能热驱动Mg（OH）₂分解后得到的高温蒸汽和高温MgO；同时剩余的空气间冷压缩热驱动热电发电机产生额外电力。研究结果表明，与基准LAES系统相比，新型LAES系统的输出功率提高了10.5 MW；电往返效率从46.81%提高到56.96%。节流阀的阀前温度和阀前压力决定了空气液化率，随着阀前温度升高，液化率达到峰值时对应的阀前压力同步升高。此外，本文还研究了压缩机级数以及MgO和高温蒸汽的分流分率对系统性能的影响。更多还原

【Abstract】 The liquid air energy storage（LAES） technology, with high energy storage density and independence from geographical constraints, excels in smoothing intermittency and variability of renewable energy electricity. Solar energy, as a clean renewable energy source, could effectively enhance the thermodynamic performance of the LAES system. Based on the Mg（OH）₂/MgO thermochemical reaction system, a novel solar-coupled LAES system was proposed in this study. During the energy release period,the heat absorbed by the air before entering the turbines not only comes from the intercooling heat of the air but also from the hightemperature steam and MgO produced by the solar-driven Mg（OH）₂ decomposition. Besides, the remaining intercooling heat of the air is employed to drive a thermoelectric generator to produce additional electricity. Research findings show that compared to the baseline LAES system, the new LAES system increases 10.5 MW in power output, with the system’s round-trip efficiency rising from 46.81% to 56.96%. The air liquefaction rate was determined by the pre-valve temperature and pressure, with the pressure corresponding to the peak air liquefaction rate increasing when the pre-valve temperature rises. In addition, this study also investigated the impact of the air compressors’ stage and the splitting fraction of MgO and high-temperature steam on the system performance.更多还原