THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Guoxun Jing

,

Yue Sun

,

Chuang Liu

,

Shaoshuai Guo

INVESTIGATION OF THE SUPPRESSION EFFECT OF INERT DUST ON THE PRESSURE CHARACTERISTICS OF GAS COAL DUST EXPLOSION

ABSTRACT
The suppression effect of inert powder on gas-induced suspension coal dust explosions was investigated using a semi-closed pipeline experimental platform. The shock wave overpressure propagation characteristics of gas explosions with different concentrations of mixed dust (calcium carbonate and coal dust) were measured and analyzed. The suppression mechanism of inert powder on the explosion process was also discussed. The results indicate that when the coal dust concentration is 200 g/m³, the peak overpressure of the explosion decreases gradually with increasing inert powder concentration, and the peak overpressure ratio in the pipeline shows a decreasing-increasing trend. The acceleration of the explosion pressure reduces with increasing mixed dust concentration, and when high concentration of mixed dust is involved in the explosion, the acceleration of the explosion pressure is lower than that when only coal dust is involved. The inhibitory effect of calcium carbonate on dust explosion increased linearly with its concentration when the ratio of inert dust to coal dust was 1:2. Inert powder mainly suppresses the explosive power by physical heat absorption and reducing heat ex-change efficiency. The experimental results established the theoretical basis for inert dust suppressing coal dust participation in explosions, and have reference significance for formulating mine explosion suppression measures.
KEYWORDS
gas coal dust explosion, inert dust, explosion pressure
PAPER SUBMITTED: 2023-12-09
PAPER REVISED: 2024-01-31
PAPER ACCEPTED: 2024-02-04
PUBLISHED ONLINE: 2024-04-14
DOI REFERENCE: https://doi.org/10.2298/TSCI231209095J
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 5, PAGES [3789 - 3799]
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Investigation of the suppression effect of inert dust on the pressure characteristics of gas coal dust explosion

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence