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| A method to determine the operating pressure range of lined underground gas storage facility in a compressed air energy storage system |
| ZHANG Guohua1，2，3，WANG Xinjin2，KE Hong2，4，XIANG Yue2，GUO Hui3，XIONG Feng2，HUA Dongjie2 |
| (1. School of Sustainable energy，China University of Geosciences，Wuhan，Hubei 430078，China；2. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；3. Key Laboratory of Geological Survey and Evaluation of Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China；4. China Energy Engineering Group Yunnan Electric Power Design Institute Co.，Ltd. kunming，Kunming，Yunan 650011，China) |
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Abstract The operating pressure range of lined underground gas storage facilities is an important design parameter，which is related to its long-term satiability and cost. Currently，the operating pressure range is mostly determined from the perspective of anti-uplift stability. The plastic state of the surrounding rock，which threatens the long-term stability of the CAES system，is not taken into consideration. Therefore，starting from the force characteristics of the gas storage structure，the elastoplastic state of the gas storage structure is analyzed according to the elastic design concept. A method to determine the operating pressure is proposed and its physical meanings are explained. When the operating pressure range during gas injection and withdrawal cycles is in this range，the structures of the gas storage remain in an elastic state，avoiding continuous accumulation of plastic deformation and structural damage. It is helpful for the long-term operation of the gas storage facility. Furthermore，the influences of factors such as the radius of the gas storage facility，the grade and thickness of the concrete lining，the strength of the surrounding rock mass，the crustal stress and the lateral pressure coefficient on operating pressure range are analyzed. The results show that the physical meaning of the operating pressure range is to use the crustal stress typical points as the center，draw a circle tangent to the surrounding rock strength curve，and the two points where this circle intersects with the axis of normal stress are the upper and lower limits of the operating pressure；the crustal stress，the lateral pressure coefficient and the strength of the surrounding rock mass are the main factors that affecting the operating pressure range；factors such as the radius of the gas storage facility，the grade and thickness of the concrete lining can be neglected；When the grade of the surrounding rock mass is unknown during the survey stage，the operating pressure range is generally between 0.5 to 1.5 times the crustal stress and this range should be further reduced if the crustal stress is far away from the isotropic state. These findings can provide theoretical support for determining the operating pressure range of the LRC in a CAES system.
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CHEN Weizhong1*, LIU Xinyu1, 2, YANG Jianping1, WANG Wei1, 2, ZANG Zhonghai3, DING Hongyuan3, ZHANG Zheyuan3, WANG Xiaogang3, SHI Zhengrong1. Development of a large-scale 3D physical model test system for underground energy storage caverns and its model experimental study[J]. , 2026, 45(6): 1615-1628. |
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2024, Vol. 43 
