| 湘衡盐矿某采区盐腔压气蓄能可利用潜力数值模拟分析 |
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| 关键词:salt mining area compressed air energy storage underground energy storage cavern cavity stability numerical simulation |
| 基金项目:本文由地球深部探测与矿产资源勘查国家科技重大专项(编号: 2024ZD1004107)、中国地质科学院基本科研业务费项目“自然资源部碳封存与地质储能工程技术创新中心建设与运行”(编号: JKY202413)和国家自然科学基金项目(编号: U2244215; U2344226)联合资助。 |
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| Numerical Study on the Operational Potential for Compressed Air Energy Storage in Salt Caverns in the Xiangheng Salt Mine |
| The advancement of energy storage technologies has become a critical initiative in response to the urgent demands of China’s energy transition and strategic considerations for energy security. The Xiangheng salt mining area in Hunan Province, one of China’s super-large-scale deposits, contains salt caverns (formed after solution mining) that have the potential for energy storage reservoir construction. The focus of this study was on the construction of an integrated analysis framework for “geological model–numerical simulation–stability evaluation–economic and environmental benefits.” Specifically, based on morphological data of the Xiangheng Salt Mine obtained through geophysical exploration, a cavity structure model was established after equivalent simplification. A long-term energy storage numerical simulation was conducted using FLAC3D. In combination with a multi-index performance evaluation system, the evolution law of long-term stability of the connected double-cavity compressed air energy storage reservoir under different operating pressures was systematically analyzed. The results indicate that, while maintaining a constant cyclic injection-withdrawal pressure difference, a moderate overall increase in the cyclic operating pressure leads to a gradual increase in the cavern surrounding rock displacement and volume change rate. However, the plastic zone volume remained largely stable, and the area with a low dilatancy safety factor progressively shrank. This suggests that higher operating pressure is beneficial for ensuring the long-term creep stability of salt cavern energy storage reservoirs. Based on the simulation results, an optimal operational pressure range of 4.3–5.8 MPa is recommended for the CAES system in this salt caverns. The salt caverns can effectively store 1.57×107 m3 of air under standard conditions, equivalent to 1.46×105 kW·h of energy. This capacity is projected to meet the construction requirements for a 36.5 MW/146 MWh energy storage power station. Once operational, the facility is expected to generate an annual net economic profit of 3.6 to 6.3 million RMB while reducing CO2 emissions by 17 200 to 30 100 metric tons, offering both economic and environmental benefits. This study provides a valuable reference and case analysis for assessing the feasibility of using salt caverns for energy storage in Central China. |
| CI Huiling,DUAN Qinxia,LI Cai,GUO Chaobin,HE Qingcheng,RUAN Yuejun,HE Yang.2026.Numerical Study on the Operational Potential for Compressed Air Energy Storage in Salt Caverns in the Xiangheng Salt Mine[J].Acta Geoscientica Sinica,47(3):667-678. |
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