A new shock tube configuration for studying dust-lifting during the initiation of a coal dust explosion

Gildfind, David E. and Morgan, Richard G. (2014) A new shock tube configuration for studying dust-lifting during the initiation of a coal dust explosion. Journal of Loss Prevention in the Process Industries, 29 1: 198-208. doi:10.1016/j.jlp.2014.02.011

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Author Gildfind, David E.
Morgan, Richard G.
Title A new shock tube configuration for studying dust-lifting during the initiation of a coal dust explosion
Journal name Journal of Loss Prevention in the Process Industries   Check publisher's open access policy
ISSN 0950-4230
1873-3352
Publication date 2014-01-01
Sub-type Article (original research)
DOI 10.1016/j.jlp.2014.02.011
Open Access Status Not Open Access
Volume 29
Issue 1
Start page 198
End page 208
Total pages 11
Place of publication London, United Kingdom
Publisher Elsevier
Language eng
Abstract The traditional defence against propagating coal dust explosions is the application of dry stone dust. This proven and effective safety measure is strictly regulated based on extensive international experience. While new products, such as foamed stone dust, offer significant practical benefits, no benchmark tests currently exist to certify their dust lifting performance in comparison to dry stone dust. This paper reviews the coal dust explosion mechanism, and argues that benchmark testing should focus on dust lifting during the initial development of the explosion, prior to arrival of the flame. In a practical context, this requires the generation of shock waves with Mach numbers ranging from 1.05 to 1.4, and test times of the order of 10’s to 100’s of milliseconds. These proposed test times are significantly longer than previous laboratory studies, however, for certification purposes, it is argued that the dust lifting behaviour should be examined over the full timescales of an actual explosion scenario. These conditions can be accurately targeted using a shock tube at length scales of approximately 50 m. It is further proposed that useful test time can be maximised if an appropriately sized orifice plate is fitted to the tube exit, an arrangement which also offers practical advantages for testing. The paper demonstrates this operating capability with proof-of-concept experiments using The University of Queensland’s X3 impulse facility.
Keyword Coal dust explosion
Stone dusting
Low Mach number blast wave
Shock tube
Orifice plate
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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Created: Thu, 13 Mar 2014, 02:16:33 EST by Mr David Gildfind on behalf of School of Mechanical and Mining Engineering