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Optimizing Simulation and Analysis of Automated Top-Coal Drawing Technique in Extra-Thick Coal Seams

Author

Listed:
  • Qunlei Zhang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
    School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China)

  • Ruifu Yuan

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Shen Wang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
    College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Dongyin Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Huamin Li

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

  • Xuhe Zhang

    (School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China)

Abstract

A particle element approach based on continuum-discontinuum element method (CDEM) is applied to optimize the automated top-coal drawing techniques in extra-thick coal seams. Numerical models with 100 drawing openings are created according to the field engineering geological conditions of Tongxin coal mine in China. An automated coal drawing control approach in numerical modelling based on time criterion is proposed. The rock mixed rate, top-coal recovery rate and the variance of the drawn top coal amount are counted and set as the statistical indicators to evaluate the top-coal drawing techniques. The traditional top-coal drawing criterion, “rocks appear, close the opening”, leads to low recovery of top coal and waste of coal resources in extra-thick coal seams, significantly weakening the transport stability and efficiency of the scraper conveyer. A three-round unequal time top-coal drawing technique is proposed for automated top-coal drawing. Three drawing openings, corresponding to the three top-coal drawing rounds respectively, are working at the same time; in each round, the top-coal drawing sequence is from the first drawing opening at one end of the working face to last drawing opening at another end; the drawing time of each round is not equal and increases with the round number. The numerical inversion approach of iteration steps can be used for real top-coal drawing time estimation and automated drawing process design to achieve a better top coal drawing effect, while the exact time for each drawing round still needs to be corrected by engineering practice.

Suggested Citation

  • Qunlei Zhang & Ruifu Yuan & Shen Wang & Dongyin Li & Huamin Li & Xuhe Zhang, 2020. "Optimizing Simulation and Analysis of Automated Top-Coal Drawing Technique in Extra-Thick Coal Seams," Energies, MDPI, vol. 13(1), pages 1-20, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:1:p:232-:d:304683
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    Citations

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    Cited by:

    1. Hongbin Li & Dongyin Li & Weiyu Zhang & Huamin Li & Shen Wang & Hao Wang & Xiaokai Xu & Zhenfeng Li, 2021. "Numerical Damping Calibration Study of Particle Element Method-Based Dynamic Relaxation Approach for Modeling Longwall Top-Coal Caving," Energies, MDPI, vol. 14(9), pages 1-17, April.
    2. Yi Yang & Xinwei Li & Huamin Li & Dongyin Li & Ruifu Yuan, 2020. "Deep Q-Network for Optimal Decision for Top-Coal Caving," Energies, MDPI, vol. 13(7), pages 1-14, April.
    3. Yuming Huo & Defu Zhu & Zhonglun Wang & Xuanmin Song, 2021. "Numerical Investigation of Top Coal Drawing Evolution in Longwall Top Coal Caving by the Coupled Finite Difference Method-Discrete Element Method," Energies, MDPI, vol. 14(1), pages 1-18, January.

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