Temperature and pressure variations in salt compressed air energy storage (CAES) caverns considering the air flow in the underground wellbore
Temperature and pressure variations in salt compressed air energy storage (CAES) caverns considering the air flow in the underground wellbore
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DOI：
10.1016/j.est.2022.104846
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发表时间：
2022-08
影响因子：
9.4
通讯作者：
Yue Han;Hao Cui;Hongling Ma;Jianlin Chen;N. Liu
中科院分区：
文献类型：
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作者：
Yue Han;Hao Cui;Hongling Ma;Jianlin Chen;N. Liu
压缩空气在井筒中的流动对盐压缩空气储能(CAES)洞穴的热力性能有影响，但这种影响尚不清楚。本文提出了一种考虑井筒流动的耦合显式有限差分模型来计算空腔内压缩空气的热力性能。结果表明，热力性能直接取决于井筒出口空气温度和压力，而空气温度和压力又受井筒内流动的影响。敏感性研究表明，喷射质量比是关键参数，显著提高了洞室内的空气温度和压力。注入温度和井筒长度是次要因素。较高的注塑压力有利于储能。井筒内径、粗糙度和导热系数对采油效果影响不大。所开发的组合模型是一种更准确地预测深部CAES洞穴热力性能的工具。
The flow of compressed air in the wellbore affects the thermodynamic performance in the salt compressed air energy storage (CAES) cavern and this effect is still uncharted. In this study, a coupled explicit finite difference model considering the wellbore flow is proposed to obtain thermodynamic performance of the compressed air in the cavern. It is found that the thermodynamic performance is directly determined by the air temperature and pressure at the wellbore outlet, which are changed by the flow in the wellbore. A sensitivity study shows that the injection mass rate is the key parameter and significantly increases the air temperature and pressure in the cavern. The injection temperature and wellbore length are secondary factors. A high injection pressure is beneficial for energy storage. The inner diameter, roughness and thermal conductivity of the wellbore influence the performance slightly. The developed combined model is a more accurate tool for predicting the thermodynamic performance of a deep CAES cavern.