Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle
Abstract The sCO2 Brayton cycle has gained interest because of its flexibility and ability to provide higher thermomechanical conversion efficiency. Studies on failure conditions and corresponding emergency measures are of great significance to ensure the safety of the system, while there are limite...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-12-01
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| Series: | Energy Science & Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ese3.1300 |
| _version_ | 1798004816966844416 |
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| author | Rui Wang Xinyu Li Zheng Qin Lintao Wang Zhimin Lin Xuan Wang Hua Tian Gequn Shu |
| author_facet | Rui Wang Xinyu Li Zheng Qin Lintao Wang Zhimin Lin Xuan Wang Hua Tian Gequn Shu |
| author_sort | Rui Wang |
| collection | DOAJ |
| description | Abstract The sCO2 Brayton cycle has gained interest because of its flexibility and ability to provide higher thermomechanical conversion efficiency. Studies on failure conditions and corresponding emergency measures are of great significance to ensure the safety of the system, while there are limited studies related to the sCO2 Brayton cycle because the test circuit has not been applied in practice at present. In this study, we have developed a dynamic model of the CO2 Brayton cycle, and carefully validated its components against experimental data. Preliminary safety assessment and dynamic response under loss of cooling water (LOCW), loss of heat source (LOHS), and pipeline leakage have been analyzed. Emergency strategies are proposed to maintain the safe operation under failure conditions. The primary objective of this study is to reveal the dynamic performance and emergency measures under failure conditions of the sCO2 Brayton cycle. The results demonstrate that the system net power decreases at rates close to 10%/s and less than 0.1%/s under LOCW and LOHS, respectively. The system responds more dramatically under LOCW compared with LOHS. The system needs emergency measures under LOCW, while it has sufficient time to realize a normal slow shutdown under LOHS. The leakage rate is at least five times higher in the high‐pressure pipeline compared with the low‐pressure pipeline for the same area of the leakage hole. Under pipeline leakage, the heat source should be cut‐off slowly, and the rotation speeds of the main compressor and recompressor should be reduced simultaneously to protect the system. |
| first_indexed | 2024-04-11T12:29:20Z |
| format | Article |
| id | doaj.art-a615a36a739c46ef884e2267bace9011 |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-04-11T12:29:20Z |
| publishDate | 2022-12-01 |
| publisher | Wiley |
| record_format | Article |
| series | Energy Science & Engineering |
| spelling | doaj.art-a615a36a739c46ef884e2267bace90112022-12-22T04:23:50ZengWileyEnergy Science & Engineering2050-05052022-12-0110124726474610.1002/ese3.1300Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycleRui Wang0Xinyu Li1Zheng Qin2Lintao Wang3Zhimin Lin4Xuan Wang5Hua Tian6Gequn Shu7State Key Laboratory of Engines Tianjin University ChinaShanghai Marine Diesel Engine Research Institute Shanghai ChinaShanghai Marine Diesel Engine Research Institute Shanghai ChinaShanghai Marine Diesel Engine Research Institute Shanghai ChinaShanghai Marine Diesel Engine Research Institute Shanghai ChinaState Key Laboratory of Engines Tianjin University ChinaState Key Laboratory of Engines Tianjin University ChinaState Key Laboratory of Engines Tianjin University ChinaAbstract The sCO2 Brayton cycle has gained interest because of its flexibility and ability to provide higher thermomechanical conversion efficiency. Studies on failure conditions and corresponding emergency measures are of great significance to ensure the safety of the system, while there are limited studies related to the sCO2 Brayton cycle because the test circuit has not been applied in practice at present. In this study, we have developed a dynamic model of the CO2 Brayton cycle, and carefully validated its components against experimental data. Preliminary safety assessment and dynamic response under loss of cooling water (LOCW), loss of heat source (LOHS), and pipeline leakage have been analyzed. Emergency strategies are proposed to maintain the safe operation under failure conditions. The primary objective of this study is to reveal the dynamic performance and emergency measures under failure conditions of the sCO2 Brayton cycle. The results demonstrate that the system net power decreases at rates close to 10%/s and less than 0.1%/s under LOCW and LOHS, respectively. The system responds more dramatically under LOCW compared with LOHS. The system needs emergency measures under LOCW, while it has sufficient time to realize a normal slow shutdown under LOHS. The leakage rate is at least five times higher in the high‐pressure pipeline compared with the low‐pressure pipeline for the same area of the leakage hole. Under pipeline leakage, the heat source should be cut‐off slowly, and the rotation speeds of the main compressor and recompressor should be reduced simultaneously to protect the system.https://doi.org/10.1002/ese3.1300emergency measuresfailure conditionspipeline leakagesCO2 Brayton cycle |
| spellingShingle | Rui Wang Xinyu Li Zheng Qin Lintao Wang Zhimin Lin Xuan Wang Hua Tian Gequn Shu Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle Energy Science & Engineering emergency measures failure conditions pipeline leakage sCO2 Brayton cycle |
| title | Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle |
| title_full | Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle |
| title_fullStr | Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle |
| title_full_unstemmed | Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle |
| title_short | Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle |
| title_sort | dynamic response and emergency measures under failure conditions of sco2 brayton cycle |
| topic | emergency measures failure conditions pipeline leakage sCO2 Brayton cycle |
| url | https://doi.org/10.1002/ese3.1300 |
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