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Mechanism of Nozzle Position Affecting Coalbed Methane Mining in High-Pressure Air Blasting

Author

Listed:
  • Huaibao Chu

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Donghui Wang

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Xiaolin Yang

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Mengfei Yu

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Bo Sun

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Shaoyang Yan

    (College of Civil Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China)

  • Guangran Zhang

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

  • Jie Xu

    (School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

Abstract

The use of clean energy is an important part of promoting sustainable energy development. As a clean energy source, coalbed methane, during the mining process, the position of the nozzle can influence coalbed methane extraction efficiency by affecting the cracking effect of coal. To investigate the impact of nozzles on the effect of coal fracture, a test of simulated coal by high-pressure air blasting was executed using nozzles 100 mm, 200 mm, and 250 mm from the orifice. Based on the test results and theories of fracture damage mechanics, two damage fracture models were established for the nozzles located in the middle-upper and middle-lower of the blasthole, respectively. The fracturing process and increased permeability mechanism of the coal were revealed by these two models. The results show that: when the nozzle is 100 mm from the orifice, the high-pressure air impacts the blasthole wall first, similar to a uniform expansion. Multiple longitudinal cracks are formed penetrating the coal. The permeability of the coal seam is greatly improved. When the nozzle is 200 mm and 250 mm from the orifice, the high-pressure air first impacts the bottom of the blasthole. The bottom hole angle and apex hole angle first form horizontal cracks while longitudinal cracks only appear at the same depth as the blasthole. The nozzle is 250 mm from the orifice to form a compaction zone at the bottom of the blasthole. The crack density is small and the tangential depth is shallow, which is not conducive to coalbed methane mining. The results of the research offer a theoretical framework and point of reference for the use of high-pressure air blasting technology in the extraction of coalbed methane (CBM).

Suggested Citation

  • Huaibao Chu & Donghui Wang & Xiaolin Yang & Mengfei Yu & Bo Sun & Shaoyang Yan & Guangran Zhang & Jie Xu, 2023. "Mechanism of Nozzle Position Affecting Coalbed Methane Mining in High-Pressure Air Blasting," Sustainability, MDPI, vol. 15(14), pages 1-15, July.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:14:p:11171-:d:1196365
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    References listed on IDEAS

    as
    1. Huaibao Chu & Mengfei Yu & Bo Sun & Shaoyang Yan & Haixia Wei & Guangran Zhang & Donghui Wang & Jie Xu, 2022. "Experimental Study on Damage Fracture Law of Coal from Solid-Propellant Blasting," Energies, MDPI, vol. 15(21), pages 1-11, October.
    2. Xu, Jizhao & Zhai, Cheng & Ranjith, Pathegama Gamage & Sang, Shuxun & Sun, Yong & Cong, Yuzhou & Tang, Wei & Zheng, Yangfeng, 2022. "Investigation of the mechanical damage of low rank coals under the impacts of cyclical liquid CO2 for coalbed methane recovery," Energy, Elsevier, vol. 239(PB).
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