Experimental investigation of limiting oxygen concentration of hybrid mixtures |
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| Institution: | 1. Dekra Process Safety, 113 Campus, Dr. Chilworth Technology, Princeton, NJ, USA;2. Dalhousie University, Process Engineering & Applied Science, Halifax, NS, Canada;3. Jensen Hughes, Inc., Halifax, NS, Canada;4. Otto von Guericke Universität, Institute of Instrumental and Environmental Technology, Department of Plant Design and Process Safety, 39106, Magdeburg, Germany;1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, 110819, China;2. Department of Civil Engineering, Shenyang Jianzhu University, Shenyang, 110168, China;3. Department of Process Engineering & Applied Science, Dalhousie University, 1360 Barrington Street, P.O. Box 15000, Halifax, NS, B3H 4R2, Canada;1. Beijing Institute of Technology, State Key Laboratory of Explosion Science and Technology, Beijing, 100081, China;2. Shanghai Jiao Tong University, School of Aeronautics and Astronautics, Shanghai, 200240, China;1. School of Chemical and Process Engineering, University of Leeds, LS2 9JT, UK;2. School of Civil Engineering, University of Leeds, LS2 9JT, UK;3. School of Mechanical Engineering, University of Leeds, LS2 9JT, UK;4. INERIS, Parc Technologique ALATA, B.P. 2, F-60550 Verneuil-en-Halatte, France |
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| Abstract: | An investigation into the limiting oxygen concentration (LOC) of fifteen combustible dusts and methane, ethanol and isopropanol hybrid mixtures in the standard 20 L explosion chamber was performed. Three ignition energies (10 J, 2 kJ and 10 kJ) were used. The results show that a 10 J electrical spark ignition leads to significantly higher limiting oxygen concentration values than either 2 kJ or 10 kJ pyrotechnic igniters. This could be due to the “overdriving” effect of the chemical igniters, which produce a hot flame that virtually covers the entire explosion chamber during combustion. With respect to hybrid mixture investigation, the 20 L sphere was modified to allow the input of methane gas and flammable solvents. The limiting oxygen concentrations of the hybrid mixtures were found to be considerably lower than those of dust air mixtures when the relatively weaker spark igniter was used. There was no significant change in limiting oxygen concentration when the higher energy chemical igniters were used. |
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| Keywords: | Limiting oxygen concentration Hybrid mixture explosion Dust explosion Gas/vapor explosion Mist explosion |
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