Experimental Partition and Numerical Simulated “Three-Zone” of Spontaneous Combustion in the Gob

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Authors

  • Mining Engineering College, North China University of Science and Technology, Key Laboratory of Mining Exploitation and Safety Technology in Hebei Province, Tangshan 063 009, Hebei ,CN
  • Mining Engineering College, North China University of Science and Technology, Key Laboratory of Mining Exploitation and Safety Technology in Hebei Province, Tangshan 063 009 ,CN
  • Mining Engineering College, North China University of Science and Technology, Key Laboratory of Mining Exploitation and Safety Technology in Hebei Province, Tangshan 063 009, Hebei ,CN

Keywords:

Duct Monitoring System, Three Zones of Spontaneous Combustion, Numerical Simulation, Oxygen Concentration.

Abstract

Based on the mechanism of spontaneous combustion of coal, the theory of gas drainage and the theory of three zones of spontaneous combustion, the application and research status are summarized at home and abroad.The preliminary understanding of gas drainage and spontaneous combustion in gob is expounded. And research status and the source of subject of spontaneous combustion and gas drainage in gob in domestic and foreign on influence of spontaneous combustion is introduced in detailed. The application study of spontaneous combustion of abandoned coal in gob of numerical simulation is mainly studied. The research background that is based on 5242Z working face in gob in lvjiatuo coal of Kailuan group, it introduces duct monitoring system that is established in 12# coal seam of 5242Z working face. Beam tube monitoring is the main method in the experiment.Through the beam tube are arranged reasonable in gob, the gas bladder with regular sampling was analyzed by gas chromatography. It has achieved continuous monitoring to spontaneous combustion in gob and has measured the distribution situation of oxygen concentration of different locations inside the gob. To measure the “three zones” division of spontaneous combustion more accurate, by setting the parameters under the same conditions, the COMSOL numerical simulation software is used to solve the mathematical model of oxygen concentration and the field distribution of oxygen concentration in mined out area can be obtained. According to the simulated results, the range of three spontaneous combustion zones in goaf is determined, and the accuracy of the division of “three zones” is ensured. According to the oxygen concentration index, the result is that the heat dissipation zone is mainly distributed in the coal wall 0~15m area from the working face, the spontaneous combustion zone is mainly distributed in the coal wall 15~45m area from the working face and the suffocation zone is mainly distributed in gob outside the coal wall 45m of the working face, which provides a reference for the formulation of the technical scheme for mine fire prevention and control in the later period. The comparison between the measured and simulated the actual results of the monitoring of the beam pipe in the mined out area shows that the actual measurement coordinate points essentially coincide with the contour lines that are processed by simulation results. There is little difference in the division of “three zones” of spontaneous combustion in gob to monitoring results and simulation calculation results of beam and tube in mined out area. Therefore, the validity of the numerical simulation is verified.

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Published

2022-10-20

How to Cite

Yue-hong, W., Yi, W., & Zhi, L. (2022). Experimental Partition and Numerical Simulated “Three-Zone” of Spontaneous Combustion in the Gob. Journal of Mines, Metals and Fuels, 66(3), 194–198. Retrieved from https://informaticsjournals.com/index.php/jmmf/article/view/31683

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References

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