Experimental study on the minimum explosion concentration of anthracite dust: The roles of O2 mole fraction,inert gas and CH4 addition |
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| Affiliation: | 1. School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China;2. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;1. School of Chemical Machinery, Dalian University of Technology, Dalian, Liaoning 116024, PR China;2. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, PR China;1. School of Chemical Engineering, Sichuan University, Chengdu, 610065, China;2. Division 2.1 “Explosion Protection Gases and Dusts’’, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, D-12205, Berlin, Germany;3. Otto von Guericke University, Universitätsplatz 2, D-39106, Magdeburg, Germany;1. Process Engineering & Applied Science, Dalhousie University, Halifax, NS, Canada;2. Martec Limited, Lloyd''s Register, Halifax, NS, Canada;3. Process Engineering, Memorial University, St. John''s, NL, Canada |
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| Abstract: | The explosion characteristics of anthracite coal dust with/without small amount of CH4 (1.14 vol %) were investigated by using a 20 L spherical explosion apparatus with an emphasis on the roles of oxygen mole fraction and inert gas. Two methods based on overpressure and combustion duration time were used to determine the minimum explosion concentration (MEC) or the lower explosion limit (LEL) of the pure anthracite coal dust and the hybrid coal-methane mixtures, respectively. The experiment results showed that increasing oxygen mole fraction increases the explosion risk of coal dust: with increasing oxygen mole fraction, the explosion pressure (Pex) and the rate of explosion pressure rise ((dp/dt)ex)) increase, while MEC decreases. The explosion risk of anthracite dust was found to be lower after replacing N2 with CO2, suggesting that CO2 has a better inhibition effect on explosion mainly due to its higher specific heat. However, the addition of 1.14% CH4 moderates the inhibition effect of CO2 and the promotion effect of O2 on anthracite dust explosion for some extent, increasing explosion severity and reducing the MEC of anthracite dust. For hybrid anthracite/CH4 mixture explosions, Barknecht's curve was found to be more accurate and conservative than Chatelier's line, but neither are sufficient from the safety considerations. The experimental results provide a certain help for the explosion prevention and suppression in carbonaceous dust industries. |
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| Keywords: | Non-atmospheric ambient Combustion duration time Explosion characteristics Hybrid mixture Explosion regimes |
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