Study on the Pseudo-Slope Length Effect of Buried Pipe Extraction in Fully Mechanized Caving Area on Gas Migration Law in Goaf

Pengxiang Zhao, Xingbao An (), Shugang Li, Xinpeng Kang, Yitong Huang, Junsheng Yang and Shikui Jin
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Pengxiang Zhao: College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Xingbao An: College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Shugang Li: College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Xinpeng Kang: College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Yitong Huang: Liuhuanggou Coal Mine, Yankuang Xinjiang Mining Co., Ltd., Changji 831100, China
Junsheng Yang: Liuhuanggou Coal Mine, Yankuang Xinjiang Mining Co., Ltd., Changji 831100, China
Shikui Jin: Xinjiang Uygur Autonomous Region Coal Science Research Institute, Urumqi 830000, China

Sustainability, 2023, vol. 15, issue 8, 1-24

Abstract: To study the law of gas transportation in mining areas, Fluent numerical simulation software was applied to examine the influence of different pseudo-slope lengths (PSL) on gas concentration in a U-ventilated working area under no-extraction conditions. Based on this, numerical simulation experiments were conducted on the buried pipe extraction arrangement parameters. The simulation found that when there was no extraction, the PSL had an impact on the airflow in the extraction area, which caused the airflow in the extraction area to be disordered, causing gas to accumulate locally at the working area. When the buried pipe depths (BPDs) and PSLs of the working area worked together, the gas concentration of the working area was lower when the inlet air influence zone and the extraction influence zone were through; otherwise, gas concentration accumulation occurred at the working area. The research results showed that when the PSL was at 25 m and BPD was at 20 m, the gas concentration at the working area was not abnormal, and the gas concentration in the upper corner was lower. By adjusting the PSL and BPD of the test working area, the maximum gas concentration in the upper corner was reduced to 0.46% and the maximum gas concentration in the return air outlet was reduced to 0.41%. The experimental and practical results provide important reference values for coal and gas co-mining.

Keywords: buried pipe extraction; inclined thick coal seam; pseudo-slope length; u-shaped ventilation; upper-corner gas concentration (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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