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Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity

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  • Wang, Yijiang
  • Jiang, Jinyi
  • Darkwa, Jo
  • Xu, Zeyuan
  • Zheng, Xiaofeng
  • Zhou, Guoqing

Abstract

A new laser irradiation fracturing method is employed to crack the Hot Dry Rock (HDR) and variations of rock temperature, specific energy (SE) and modified specific energy (MSE), thermal damages and open porosity of granite samples caused by moving laser beams with various irradiating conditions including laser power, diameter and moving speed of laser beam were investigated. Results indicate that rock temperature and the corresponding temperature gradients near the laser beam spots are strongly dependent on the laser power, beam diameter and irradiation time. The high temperature generated by the laser irradiation melts and cracks the HDR samples. The removed mass, cracked mass and size of grooving kerf induced by laser irradiation are also related to various irradiation conditions. SE and MSE are found nonlinearly reduced with the increased laser power density. Laser irradiation has a greater enhancement to thermal fracturing of granite than it does to thermal drilling. The open porosity (OP) of irradiated HDR samples increases with increasing laser power, decreasing diameter and moving speed of laser beam. The results can provide some guidance to those seeking a new economical and reasonable fracturing method for the HDR geothermal exploitation.

Suggested Citation

  • Wang, Yijiang & Jiang, Jinyi & Darkwa, Jo & Xu, Zeyuan & Zheng, Xiaofeng & Zhou, Guoqing, 2020. "Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity," Renewable Energy, Elsevier, vol. 160(C), pages 803-816.
    • Handle: RePEc:eee:renene:v:160:y:2020:i:c:p:803-816
    DOI: 10.1016/j.renene.2020.06.138
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    References listed on IDEAS

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