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44 / 2023-05-15 17:06:04
Research on CO migration and prevention and control technology in composite goaf of shallow -buried close distance coal seam group：A case study in the Lijiahao Coal Mine, China
Shallow buried thick coal seam,Multi-source air leakage,CO,Migration and accumulation law,Prevention and control technology
2. Mine ventilation, fire, water damage prevention
摘要录用
Xiaowei Zhai / Xi'an University of Science and Technology
Xintian Li / Xi’an University of Science and Technology
Qinyuan Hou / Xi’an University of Science and Technology
Teng Ma / Xi’an University of Science and Technology
Bobo Song / Xi’an University of Science and Technology
Le Hao / Xi’an University of Science and Technology
There are complex surface air leakage, interlayer air leakage, and goaf air leakage in shallow buried close distance coal seam group mining, which seriously affect the migration of CO gas in the goaf and interfere with coal spontaneous combustion warning, and prevention and control. Taking the shallow buried close distance coal seam group mining of Lijiahao Coal Mine as the engineering background, this study analyses the air leakage characteristics in goaf of shallow coal seam group, the CO migration and accumulation law in composite goaf under multi-source air leakage conditions. Proposed prevention and control measures for CO exceeding limit in goaf and return air corner of shallow buried close distance coal seams based on inhibiting oxidation of residual coal in goaf, preventing gas leakage in overlying goaf, and controlling low-speed eddy current in return air corner though theoretical analyses, on-site measurement, numerical simulation and on-site industrial experiment. The research results indicate that: The leakage air volume of 31115 working face is 20.83m3/min. The mining cracks within the range of 0-100m above the goaf have the ability to conduct air between the surface and the working face, and there is a leakage path from the surface through the 2-2 goaf. Under the pressure difference between the inlet and outlet air tunnels, the fresh air flow on the inlet side of the working face flows through a certain range of goaf behind the working face and is discharged through the outlet air tunnel. Under the action of multi-source air leakage, CO in the overlying goaf flows into the return air corner of the working face of this coal seam along with surface air leakage. The oxidation of residual coal in this coal seam generates CO gas, which transports the air leakage in the goaf towards the return air side. The air distribution of the working face has a significant impact on the risk area of spontaneous combustion of residual coal in the goaf, and the width of the oxidation temperature rise zone in the goaf increases with the increase of the air distribution of the working face. The air flow on the working face should be controlled between 1450~1550m3/min. Injecting nitrogen into the working face can effectively suppress the intensity of CO generated by the oxidation of residual coal in the goaf, reduce the concentration of CO in the goaf, but cannot change the trend of CO accumulation on the return air side of the goaf. The pressurized ventilation of the working face can reduce the pressure difference between the surface and the working face, reduce the amount of surface air leakage, and thereby reduce the range of dangerous areas for spontaneous combustion of residual coal in the goaf, indirectly reducing the intensity of CO generated by oxidation of residual coal in the goaf. The CO accumulation in the low-speed eddy current area of the return air corner has been controlled through the use of wind curtains for leak prevention, dilution of the air guide curtains, and extraction of non sparking fans. The research results can provide scientific guidance and theoretical reference for the early warning of coal spontaneous combustion and the prevention and control of CO exceeding limits in the goaf of shallow buried close distance coal seam groups.
重要日期

  • 会议日期

    08月18日

    2023

    至

    08月20日

    2023

  • 07月07日 2023

    初稿截稿日期

  • 08月20日 2023

    注册截止日期

主办单位
International Committee of Mine Safety Science and Engineering
承办单位
Heilongjiang University of Science and Technology
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