Experimental study and analysis of a novel layered packed-bed for thermal energy storage applications: A proof of concept
Experimental study and analysis of a novel layered packed-bed for thermal energy storage applications: A proof of concept
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DOI：
10.1016/j.enconman.2022.116648
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发表时间：
2023-02
影响因子：
10.4
通讯作者：
M. Ameen;Zhiwei Ma;A. Smallbone;R. Norman;A. Roskilly
中科院分区：
文献类型：
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作者：
M. Ameen;Zhiwei Ma;A. Smallbone;R. Norman;A. Roskilly
本文介绍了世界上第一个电网规模的150千瓦泵送热能储存（PHES）示范系统的调试和测试的一部分进行的研究。该系统采用了两种新型的分层填充床蓄热器。本研究实验研究的商店之一指定为“热蓄热”，它具有1072 MJ/m3的能量存储密度和存储在500 °C和12巴的热量。分层存储器是普通填充床存储器的改进，并提供更高程度的热分层。实验表明，分层可使压力损失沿着减小约64%，并使温跃层明显变窄.根据第一定律分析计算了往返效率、存储容量和利用率，同时考虑了标称设计条件下的简单模式和分层模式操作。考虑了两种循环控制方案：基于时间的和基于温度的。在基于时间的场景中，商店在两种模式下显示出几乎相似的性能。然而，在基于温度的场景中，分层模式优于。在循环操作期间，分层模式优于分层模式，因为它仅在第3个循环中达到稳态，而没有效率、容量和利用率的任何损失;简单模式产生有竞争力的效率，但容量和利用率在每个连续循环之后恶化，并且在第20个循环中达到稳态。此外，还进行了第二定律分析，以深入了解各种损失及其对性能的影响。
This paper presents a study carried out as part of commissioning and testing of world’s first grid-scale 150 kWePumped Heat Energy Storage (PHES) demonstration system. The system employs two novel layered packed-bed thermal stores. The present study experimentally investigates one of the stores designated as “hot thermal store”, which has an energy storage density of 1072 MJ/m3and stores heat at 500 °C and 12 bar. The layered store is an enhancement of a normal packed-bed store and offers a higher degree of thermal stratification. Experiments show that layering results in about 64 % reduction in pressure loss along with yielding considerably narrower thermocline. Round-trip efficiency, storage capacity and utilisation were calculated based on 1st Law analysis considering both simple and layered mode operation at nominal design conditions. Two cycle control scenarios were considered: time-based and temperature-based. In the time-based scenario, the store shows nearly similar performance in both modes. However, in temperature-based scenario, layered mode outperforms. During cyclic operation, layered mode outperforms as it reaches steady-state in merely 3rd cycle, without any loss in efficiency, capacity and utilisation; simple mode yields competitive efficiency but capacity and utilisation deteriorate after each successive cycle and steady-state is achieved in 20th cycle. 2nd Law analysis was additionally performed to gain insight into various losses and their impact on the performance.