Effect of admixture of solid inertant on fire hazard of dust layers oriented at varying degrees of inclination |
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| Institution: | 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. State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, 266590, China;2. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061, 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;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 |
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| Abstract: | Unlike metallic dust layers, the layer flammability levels (LFL) of non-metallic dust layers exhibit a wide range from Class 1 (No self-sustained combustion) to Class 6 (explosive combustion). However, determinations of layer flammability have not considered the effect of inclination angle, thereby potentially underestimating fire hazard of combustible dust layers in many industrial situations. In this research, inclined dust layers showed greater fire hazard than did horizontally oriented dust layers. For example, LFL of wood dust jumped from class 3 to class 5 when layers were positioned with an incline. Flame spread rate of PMMA dust layers increased from 1.8 to 3.6 mm/s when the angle of inclination increased from 0 to 40°. Even small amounts of solid inertant significantly decreased surface layer fires. The required amount of inertant to completely inert layer fires was far less than that for smoldering layer fires or dust explosions. |
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| Keywords: | Dust explosion Layer flammability level Layer fires Solid inertant Fire hazard |
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