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

Junfeng Wang, Yansong Zhang, Huifeng Su, Jinshe Chen, Bo Liu and Yuyuan Zhang
Additional contact information
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
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
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

Energies, 2019, vol. 12, issue 20, 1-13

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.

Keywords: oil shale and coal dust; ignition sensitivity; flame propagation; explosion mechanism (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.mdpi.com/1996-1073/12/20/3807/pdf (application/pdf)
https://www.mdpi.com/1996-1073/12/20/3807/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:12:y:2019:i:20:p:3807-:d:274400

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().