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A trans-critical carbon dioxide energy storage system with heat pump to recover stored heat of compression

机译：具有热泵的跨临界二氧化碳能量存储系统，用于回收压缩的存储热量

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In this paper, the heat pump system is used as the thermal storage system to reheat the heat of compression of the trans-critical CO2 energy storage system based on the underground gas storage reservoir, and the thermodynamic analysis and sensitivity analysis of the main equipment of the energy storage system are carried out. Considering the limitation of the thermal properties of the heat storage medium, the influence of the energy storage system composed of different heat storage medium on the system performance is studied. Results have shown that the round-trip efficiency, energy storage efficiency and heat storage efficiency of the system are 66%, 58.41%, and 46.11%, respectively. With the increase of energy storage pressure, the round-trip efficiency and energy storage efficiency increase gradually, while the heat storage efficiency decreases first and then increases. When the energy storage pressure is 23 MPa, the system has the lowest heat storage efficiency. The round-trip efficiency, energy storage efficiency and heat storage efficiency increase with the increase of the energy recovery pressure. The study also shows that the energy storage system with water as the heat storage medium has the highest efficiency and the best performance. (c) 2020 Elsevier Ltd. All rights reserved.
机译：本文以热泵系统为储热系统，对基于地下储气库的跨临界CO2储能系统的压缩热进行再热，并对主要设备的热力学分析和灵敏度分析进行了研究。进行能量存储系统。考虑到储热介质热性能的局限性，研究了由不同储热介质组成的储能系统对系统性能的影响。结果表明，该系统的往返效率，储能效率和储热效率分别为66％，58.41％和46.11％。随着储能压力的增加，往返效率和储能效率逐渐增加，而储热效率则先下降然后上升。当储能压力为23 MPa时，系统的储热效率最低。往返效率，能量存储效率和储热效率随着能量回收压力的增加而增加。研究还表明，以水为储热介质的储能系统具有最高的效率和最佳的性能。 （c）2020 Elsevier Ltd.保留所有权利。

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