A directly charged thermal store for compressed air energy storage systems
A directly charged thermal store for compressed air energy storage systems
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DOI：
10.1016/j.est.2023.108183
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发表时间：
2023
影响因子：
9.4
通讯作者：
B. Cárdenas;S. Garvey
中科院分区：
文献类型：
--
作者：
B. Cárdenas;S. Garvey
本文讨论了一种用于压缩空气储能系统的集成换热器蓄热单元（TES + HX）的设计。该装置可以直接由系统的加压空气流充能，无需额外的热交换器，减少了传热过程的数量。以中等规模、中等持续时间的CAES系统（250 kW/1 MWh）为例，研究了石英砂作为蓄热介质的蓄热性能。蓄热子系统包括一个填充床蓄热器、三个空气-空气热交换器和一个环境压力鼓风机。总的来说，这个子系统的成本约为14.7万英镑，效率为1.89%，换算成平准成本为1.48.5英镑/兆瓦时。一个综合TES + HX装置可以实现35英镑/MWh的平准化成本。该装置的估计成本为38.5k英镑，并实现了91.8%的总往返效率。集成的TES + HX单元不仅显著降低了CAES系统的资本成本并提高了效率，而且还允许更简单的整体架构。
This paper discusses the design of a heat storage unit with integrated heat exchangers (TES + HX), which is intended to work in a Compressed Air Energy Storage (CAES) system. The unit can be charged directly by the system's stream of pressurised air, eliminating the need for additional heat exchangers and reducing the number of heat transfer processes. Silica sand is used as the storage medium due to its high heat capacity, non-corrosivity and its ability to accommodate the thermal expansion of steel pipes.A medium-scale, medium-duration CAES system (250 kW/1MWh) is used as a case study. The heat storage subsystem comprises a packed-bed thermal store, three air-to-air heat exchangers and an ambient pressure air blower. Combined, this subsystem has an approximate cost of £147k and achieves an efficiency of ∼89 %, which translates into a levelized cost of ∼48.5 £/MWh. An integrated TES + HX unit can achieve a levelized cost of ∼35 £/MWh. The unit has an estimated cost of £38.5k and achieves an overall roundtrip exergy efficiency of ∼91.8 %. The integrated TES + HX unit not only offers a significant reduction in the capital cost of a CAES system and an efficiency improvement, but it also allows for a simpler overall architecture.