Thermodynamic Characteristics of Compressed Air in Salt Caverns of CAES: Considering Air Injection for Brine Drainage
The air injection for brine drainage affects the thermodynamic characteristics of salt caverns in the operation of compressed air energy storage (CAES). This study develops a thermodynamic model to predict temperature and pressure variations during brine drainage and operational cycles, validated ag...
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| Language: | English |
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2025-07-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/14/3649 |
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| author | Shizhong Sun Bin Wu Yonggao Yin Liang Shao Rui Li Xiaofeng Jiang Yu Sun Xiaodong Huo Chen Ling |
| author_facet | Shizhong Sun Bin Wu Yonggao Yin Liang Shao Rui Li Xiaofeng Jiang Yu Sun Xiaodong Huo Chen Ling |
| author_sort | Shizhong Sun |
| collection | DOAJ |
| description | The air injection for brine drainage affects the thermodynamic characteristics of salt caverns in the operation of compressed air energy storage (CAES). This study develops a thermodynamic model to predict temperature and pressure variations during brine drainage and operational cycles, validated against Huntorf plant data. Results demonstrate that increasing the air injection flow rate from 80 to 120 kg/s reduces the brine drainage initiation time by up to 47.3% and lowers the terminal brine drainage pressure by 0.62 MPa, while raising the maximum air temperature by 4.9 K. Similarly, expanding the brine drainage pipeline cross-sectional area from 2.99 m<sup>2</sup> to 9.57 m<sup>2</sup> reduces the total drainage time by 33.7%. Crucially, these parameters determine the initial pressure and temperature at the completion of brine drainage, which subsequently shape the pressure bounds of the operational cycles, with variations reaching 691.5 kPa, and the peak temperature fluctuations, with differences of up to 4.9 K during the first cycle. This research offers insights into optimizing the design and operation of the CAES system with salt cavern air storage. |
| format | Article |
| id | doaj-art-d7305280ba524ba0a426cfeb2ed984c8 |
| institution | Matheson Library |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-d7305280ba524ba0a426cfeb2ed984c82025-07-25T13:21:10ZengMDPI AGEnergies1996-10732025-07-011814364910.3390/en18143649Thermodynamic Characteristics of Compressed Air in Salt Caverns of CAES: Considering Air Injection for Brine DrainageShizhong Sun0Bin Wu1Yonggao Yin2Liang Shao3Rui Li4Xiaofeng Jiang5Yu Sun6Xiaodong Huo7Chen Ling8China Energy Engineering Group, Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, ChinaChina Energy Engineering Group, Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, ChinaSchool of Energy and Environment, Southeast University, Nanjing 210096, ChinaChina Energy Engineering Group, Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, ChinaChina Energy Engineering Group, Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, ChinaChina Energy Engineering Group, Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, ChinaChina Energy Engineering Group, Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, ChinaChina Energy Engineering Group, Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, ChinaChina Energy Engineering Group, Jiangsu Power Design Institute Co., Ltd., Nanjing 211102, ChinaThe air injection for brine drainage affects the thermodynamic characteristics of salt caverns in the operation of compressed air energy storage (CAES). This study develops a thermodynamic model to predict temperature and pressure variations during brine drainage and operational cycles, validated against Huntorf plant data. Results demonstrate that increasing the air injection flow rate from 80 to 120 kg/s reduces the brine drainage initiation time by up to 47.3% and lowers the terminal brine drainage pressure by 0.62 MPa, while raising the maximum air temperature by 4.9 K. Similarly, expanding the brine drainage pipeline cross-sectional area from 2.99 m<sup>2</sup> to 9.57 m<sup>2</sup> reduces the total drainage time by 33.7%. Crucially, these parameters determine the initial pressure and temperature at the completion of brine drainage, which subsequently shape the pressure bounds of the operational cycles, with variations reaching 691.5 kPa, and the peak temperature fluctuations, with differences of up to 4.9 K during the first cycle. This research offers insights into optimizing the design and operation of the CAES system with salt cavern air storage.https://www.mdpi.com/1996-1073/18/14/3649compressed air energy storagesalt cavern air storagebrine drainagethermodynamic characteristics |
| spellingShingle | Shizhong Sun Bin Wu Yonggao Yin Liang Shao Rui Li Xiaofeng Jiang Yu Sun Xiaodong Huo Chen Ling Thermodynamic Characteristics of Compressed Air in Salt Caverns of CAES: Considering Air Injection for Brine Drainage Energies compressed air energy storage salt cavern air storage brine drainage thermodynamic characteristics |
| title | Thermodynamic Characteristics of Compressed Air in Salt Caverns of CAES: Considering Air Injection for Brine Drainage |
| title_full | Thermodynamic Characteristics of Compressed Air in Salt Caverns of CAES: Considering Air Injection for Brine Drainage |
| title_fullStr | Thermodynamic Characteristics of Compressed Air in Salt Caverns of CAES: Considering Air Injection for Brine Drainage |
| title_full_unstemmed | Thermodynamic Characteristics of Compressed Air in Salt Caverns of CAES: Considering Air Injection for Brine Drainage |
| title_short | Thermodynamic Characteristics of Compressed Air in Salt Caverns of CAES: Considering Air Injection for Brine Drainage |
| title_sort | thermodynamic characteristics of compressed air in salt caverns of caes considering air injection for brine drainage |
| topic | compressed air energy storage salt cavern air storage brine drainage thermodynamic characteristics |
| url | https://www.mdpi.com/1996-1073/18/14/3649 |
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