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On the Factors of Impact Pressure in Supercritical CO 2 Phase-Transition Blasting—A Numerical Study

Author

Listed:
  • Chao Pu

    (A Key Lab Low-Grade Energy Utilization Technol & Syst, Chongqing University, Ministry of Education, Chongqing 400030, China)

  • Zhenjian Liu

    (College of Civil Engineering, Yancheng Institute of Technology, Yancheng 221051, China)

  • Ge Pu

    (A Key Lab Low-Grade Energy Utilization Technol & Syst, Chongqing University, Ministry of Education, Chongqing 400030, China)

Abstract

Carbon dioxide phase transition blasting (CO 2 -PB) technology is an effective and economical technology used for breaking rocks. The use of CO 2 -PB can significantly reduce the vibration damage to surrounding rocks. There is little research on the shockwave generated by the CO 2 -PB, and simulation can better show the flow field characteristics. In order to clarify the mechanism of its blasting load process, a theoretical analysis and a numerical model were developed to study the flow-field characteristics and the impact pressure of CO 2 -PB. Our results show that the CO 2 absorbs heat from the surrounding environment, producing a significant low-temperature area. The overpressure is significantly lower than the driving gas pressure to the ambient pressure, limiting the maximum over-pressure that can be obtained. When the pressure in CO 2 -PB reaches 100 MPa, the shockwave is about 4.25 MPa. As the distance increases, the peak value of the shockwave decays rapidly. As the dimensionless distance increases from 1 to 5, the dimensionless overpressure decreases from 1 to 0.23. Under the same blasting pressure, increasing the filling pressure and increasing the filling volume slightly reduce the initial pressure of the shockwave. In the shock stage, strong compression is formed on the surface of the shockwave, resulting in a higher peak pressure value. Meanwhile, the stable pressure is influenced by the target distance, blasting pressure, and CO 2 -PB length.

Suggested Citation

  • Chao Pu & Zhenjian Liu & Ge Pu, 2022. "On the Factors of Impact Pressure in Supercritical CO 2 Phase-Transition Blasting—A Numerical Study," Energies, MDPI, vol. 15(22), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:22:p:8599-:d:975074
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    References listed on IDEAS

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    2. Shengtao Zhou & Nan Jiang & Xu He & Xuedong Luo, 2020. "Rock Breaking and Dynamic Response Characteristics of Carbon Dioxide Phase Transition Fracturing Considering the Gathering Energy Effect," Energies, MDPI, vol. 13(6), pages 1-16, March.
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    5. Bo Ke & Keping Zhou & Gaofeng Ren & Ji Shi & Yanan Zhang, 2019. "Positive Phase Pressure Function and Pressure Attenuation Characteristic of a Liquid Carbon Dioxide Blasting System," Energies, MDPI, vol. 12(21), pages 1-16, October.
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