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Experimental study on the physical and mechanical variations of hot granite under different cooling treatments

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  • Kang, Fangchao
  • Jia, Tianrang
  • Li, Yingchun
  • Deng, Jianhui
  • Tang, Chun'an
  • Huang, Xin

Abstract

Geothermal energy arrested in HDR (hot dry rock) is commonly harvested from the reservoir fractured by artificial stimulations. Understanding the physical and mechanical behaviors of HDR after different cooling treatments is critical for selecting most efficient fluid to fracture the rock mass. Here we experimentally examine the physical and mechanical variations of a typical type of HDR, granite, after natural, water, and liquid-nitrogen cooling treatments, followed by a multi-scale investigation on the evolution of cracks. We find that the effect of cooling treatment on the physical and mechanical properties of heated granite specimens is increasingly remarkable as the peak temperature grows. The difference among the influences of different cooling treatments is unnoticeable when the specimens are heated to peak temperatures of 200 °C and 400 °C, but becomes highly pronounced as the peak temperature ascends to 600 °C and 800 °C. Liquid-nitrogen cooling treatment induces most alterations in the granite properties. The cracks in the granite specimens cooled by liquid-nitrogen coalesce together and form complex fracture networks, which are more intensive than those by natural and water cooling treatments. Previous studies claimed that the liquid-nitrogen cooling treatment had weaker influence on the granite specimen than water, possibly due to the Leidenfrost effect that impeded the heat transfer between rock and liquid-nitrogen. Our findings demonstrate that liquid-nitrogen is superior in cracking and thus enhancing the permeability of the granite specimens, particularly for those heated to a temperature over 400 °C. The good performance of liquid-nitrogen is attributed to that the granite specimen is easily cracked by the high tensile stress created jointly by the high temperature difference caused by its ultra-low temperature and large convective heat transfer coefficient induced by violent boiling.

Suggested Citation

  • Kang, Fangchao & Jia, Tianrang & Li, Yingchun & Deng, Jianhui & Tang, Chun'an & Huang, Xin, 2021. "Experimental study on the physical and mechanical variations of hot granite under different cooling treatments," Renewable Energy, Elsevier, vol. 179(C), pages 1316-1328.
  • Handle: RePEc:eee:renene:v:179:y:2021:i:c:p:1316-1328
    DOI: 10.1016/j.renene.2021.07.132
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    References listed on IDEAS

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    Cited by:

    1. Zhao, Peng & Liu, Jun & Elsworth, Derek, 2023. "Numerical study on a multifracture enhanced geothermal system considering matrix permeability enhancement induced by thermal unloading," Renewable Energy, Elsevier, vol. 203(C), pages 33-44.
    2. Qu, Hai & Li, Chengying & Chen, Xiangjun & Liu, Xu & Guo, Ruichang & Liu, Ying, 2023. "LN cooling on mechanical properties and fracture characteristics of hot dry granites involving ANN prediction," Renewable Energy, Elsevier, vol. 216(C).
    3. Soumen Paul & Somnath Chattopadhyaya & A. K. Raina & Shubham Sharma & Changhe Li & Yanbin Zhang & Amit Kumar & Elsayed Tag-Eldin, 2022. "A Review on the Impact of High-Temperature Treatment on the Physico-Mechanical, Dynamic, and Thermal Properties of Granite," Sustainability, MDPI, vol. 14(22), pages 1-24, November.
    4. Xue, Yi & Liu, Shuai & Chai, Junrui & Liu, Jia & Ranjith, P.G. & Cai, Chengzheng & Gao, Feng & Bai, Xue, 2023. "Effect of water-cooling shock on fracture initiation and morphology of high-temperature granite: Application of hydraulic fracturing to enhanced geothermal systems," Applied Energy, Elsevier, vol. 337(C).
    5. Shi, Yu & Xu, Fuqiang & Song, Xianzhi & Wang, Gaosheng & Zuo, Yinhui & Li, Xiaojiang & Ji, Jiayan, 2023. "Rock damage evolution in the production process of the enhanced geothermal systems considering thermal-hydrological-mechanical and damage (THM-D)," Energy, Elsevier, vol. 285(C).

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