Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action
During the development of hot dry rock, the research on thermal fatigue damage caused by thermal shock of cold and heat cycles is the basis that ensures the long-term utilization of geothermal resources, but there are not enough relevant studies at present. Based on this, the thermal damage tests of...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-09-01
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| Series: | International Journal of Mining Science and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268621000835 |
| _version_ | 1818581526824091648 |
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| author | Jianjun Hu Heping Xie Qiang Sun Cunbao Li Guikang Liu |
| author_facet | Jianjun Hu Heping Xie Qiang Sun Cunbao Li Guikang Liu |
| author_sort | Jianjun Hu |
| collection | DOAJ |
| description | During the development of hot dry rock, the research on thermal fatigue damage caused by thermal shock of cold and heat cycles is the basis that ensures the long-term utilization of geothermal resources, but there are not enough relevant studies at present. Based on this, the thermal damage tests of granite at different temperatures (250, 350, 450 °C) and quenching cycles (1, 5, 10, 15 cycles) were carried out. Preliminary reveals the damage mechanism and heat transfer law of the quenching cycle effect on hot dry rock. The results show that with the increase of temperature and cycles, the uneven thermal expansion of minerals and the thermal shock caused by quenching promote the crack development of granite, resulting in the decrease of P-wave velocity, thermal conductivity and uniaxial compressive strength of granite. Meanwhile, the COMSOL was used to simulate the heat transfer of hot dry rock under different heat treatment conditions. It concluded that the increase in the number of quenching cycles reduced the heat transfer capacity of the granite, especially more than 10 quenching cycles, which also reflects that the thermal fatigue damage leads to a longer time for the temperature recovery of the hot dry rock mass. In addition, the three-dimensional nonlinear fitting relationship among thermal conductivity, temperature and cycle number was established for the first time, which can better reveal the change rule of thermal conductivity after quenching thermal fatigue effect of hot dry rock. The research results provide theoretical support for hot dry rock reservoir reconstruction and production efficiency evaluation. |
| first_indexed | 2024-12-16T07:34:54Z |
| format | Article |
| id | doaj.art-c8a95e2f1eac4e4692a0ac07015e4c71 |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-12-16T07:34:54Z |
| publishDate | 2021-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-c8a95e2f1eac4e4692a0ac07015e4c712022-12-21T22:39:16ZengElsevierInternational Journal of Mining Science and Technology2095-26862021-09-01315843852Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature actionJianjun Hu0Heping Xie1Qiang Sun2Cunbao Li3Guikang Liu4College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaGuangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy, Shenzhen University, Shenzhen 518060, China; Corresponding authors.Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China; Corresponding authors.Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy, Shenzhen University, Shenzhen 518060, ChinaCollege of Water Resource and Hydropower, Sichuan University, Chengdu 610065, ChinaDuring the development of hot dry rock, the research on thermal fatigue damage caused by thermal shock of cold and heat cycles is the basis that ensures the long-term utilization of geothermal resources, but there are not enough relevant studies at present. Based on this, the thermal damage tests of granite at different temperatures (250, 350, 450 °C) and quenching cycles (1, 5, 10, 15 cycles) were carried out. Preliminary reveals the damage mechanism and heat transfer law of the quenching cycle effect on hot dry rock. The results show that with the increase of temperature and cycles, the uneven thermal expansion of minerals and the thermal shock caused by quenching promote the crack development of granite, resulting in the decrease of P-wave velocity, thermal conductivity and uniaxial compressive strength of granite. Meanwhile, the COMSOL was used to simulate the heat transfer of hot dry rock under different heat treatment conditions. It concluded that the increase in the number of quenching cycles reduced the heat transfer capacity of the granite, especially more than 10 quenching cycles, which also reflects that the thermal fatigue damage leads to a longer time for the temperature recovery of the hot dry rock mass. In addition, the three-dimensional nonlinear fitting relationship among thermal conductivity, temperature and cycle number was established for the first time, which can better reveal the change rule of thermal conductivity after quenching thermal fatigue effect of hot dry rock. The research results provide theoretical support for hot dry rock reservoir reconstruction and production efficiency evaluation.http://www.sciencedirect.com/science/article/pii/S2095268621000835Alkaline graniteQuenching cycleThermal conductivityP-wave velocityHigh-temperatureDeep rock |
| spellingShingle | Jianjun Hu Heping Xie Qiang Sun Cunbao Li Guikang Liu Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action International Journal of Mining Science and Technology Alkaline granite Quenching cycle Thermal conductivity P-wave velocity High-temperature Deep rock |
| title | Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action |
| title_full | Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action |
| title_fullStr | Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action |
| title_full_unstemmed | Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action |
| title_short | Changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action |
| title_sort | changes in the thermodynamic properties of alkaline granite after cyclic quenching following high temperature action |
| topic | Alkaline granite Quenching cycle Thermal conductivity P-wave velocity High-temperature Deep rock |
| url | http://www.sciencedirect.com/science/article/pii/S2095268621000835 |
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