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Explosion Characteristics and Flame Propagation Behavior of Mixed Dust Cloud of Coal Dust and Oil Shale Dust

Author

Listed:
  • Junfeng Wang

    (College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Yansong Zhang

    (College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China
    Key Laboratory of Ministry of Education for Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China)

  • Huifeng Su

    (College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China)

  • Jinshe Chen

    (College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China
    Key Laboratory of Ministry of Education for Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China)

  • Bo Liu

    (College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Yuyuan Zhang

    (College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

Abstract

Coal and oil shale are often mined and utilized together, and mixed dust is easily formed in these processes. In order to ensure safe production in these processes, the explosion characteristics of mixed dust were studied. Using a Godbert-Greenwold (G-G) Furnace experimental device, Hartmann tube experimental device, and 20 L explosion vessel, the oil shale and coal mixed dust ignition sensitivity experiment, flame propagation experiment, and explosion characteristics experiment were carried out. The minimum ignition temperature (MIT), minimum ignition energy (MIE), maximum explosion pressure ( P max ), maximum rate of pressure rise (( dp/dt ) max ), and explosibility index ( K St ) parameters and the flame propagation behavior of the mixed dust were analyzed in detail. A scanning electron microscope (SEM) analysis of the coal and oil shale dust before and after the explosion was carried out to study the changes in the microscopic morphology of the dust particles. The results show that due to the oil shale having a high volatile content and low moisture content, in the mixture, the greater the percentage of oil shale, the more likely the dust cloud is to be ignited and the faster the explosion flame is propagated; the greater the percentage of oil shale, the greater the ( dP/dt ) max and K St will be and, under a high dust concentration, a greater P max will be produced. During explosion, coal dust will experience particle pyrolysis and the gas phase combustion of the volatile matter, followed by solid phase combustion of coal char, whereas oil shale dust will only experience particle pyrolysis and the gas phase combustion of the volatile matter.

Suggested Citation

  • Junfeng Wang & Yansong Zhang & Huifeng Su & Jinshe Chen & Bo Liu & Yuyuan Zhang, 2019. "Explosion Characteristics and Flame Propagation Behavior of Mixed Dust Cloud of Coal Dust and Oil Shale Dust," Energies, MDPI, vol. 12(20), pages 1-13, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:20:p:3807-:d:274400
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    References listed on IDEAS

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    1. Yan Wang & Xiangqing Meng & Wentao Ji & Bei Pei & Chendi Lin & Hao Feng & Ligang Zheng, 2019. "The Inhibition Effect of Gas–Solid Two-Phase Inhibitors on Methane Explosion," Energies, MDPI, vol. 12(3), pages 1-10, January.
    2. Jan Skřínský & Tadeáš Ochodek, 2019. "Explosion Characteristics of Propanol Isomer–Air Mixtures," Energies, MDPI, vol. 12(8), pages 1-15, April.
    3. Yimin Zhang & Yan Wang & Ligang Zheng & Tao Yang & Jianliang Gao & Zhenhua Li, 2018. "Effect of Pristine Palygorskite Powders on Explosion Characteristics of Methane-Air Premixed Gas," Energies, MDPI, vol. 11(10), pages 1-12, September.
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    Cited by:

    1. Timur Valiullin & Ksenia Vershinina & Pavel Strizhak, 2019. "Ignition of Slurry Fuel Droplets with Different Heating Conditions," Energies, MDPI, vol. 12(23), pages 1-18, November.
    2. Dongmei Wu & Jie Gao & Ke Lu, 2022. "Dust Control Technology in Dry Directional Drilling in Soft and Broken Coal Seams," Energies, MDPI, vol. 15(10), pages 1-11, May.

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