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

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College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China
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Key Laboratory of Ministry of Education for Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
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College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China
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Author to whom correspondence should be addressed.
Energies 2019, 12(20), 3807; https://doi.org/10.3390/en12203807
Received: 4 September 2019 / Revised: 28 September 2019 / Accepted: 6 October 2019 / Published: 9 October 2019
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 (Pmax), maximum rate of pressure rise ((dp/dt)max), and explosibility index (KSt) 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 KSt will be and, under a high dust concentration, a greater Pmax 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. View Full-Text
Keywords: oil shale and coal dust; ignition sensitivity; flame propagation; explosion mechanism oil shale and coal dust; ignition sensitivity; flame propagation; explosion mechanism
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MDPI and ACS Style

Wang, J.; Zhang, Y.; Su, H.; Chen, J.; Liu, B.; Zhang, Y. Explosion Characteristics and Flame Propagation Behavior of Mixed Dust Cloud of Coal Dust and Oil Shale Dust. Energies 2019, 12, 3807.

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