A numerical model to simulate smouldering fires in bulk materials and dust deposits |
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| Institution: | 1. Research Centre for Fire Safety Engineering, Hong Kong Polytechnic University, Hong Kong SAR;2. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China;3. Department of Mechanical Engineering, University of California, Berkeley, CA 94720, United States of America;1. Department of Civil and Environmental Engineering, The University of Western Ontario, London, Ontario N6A 5B9, Canada;2. Department of Civil Engineering, Lassonde School of Engineering, York University, Toronto, Ontario M3J 1P3, Canada;3. Department of Civil, Environmental and Geomatic Engineering, University College London, London WC1E 6BT, UK;1. Research Centre for Fire Safety Engineering, Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;2. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, Guangdong, China |
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| Abstract: | A numerical model is presented which consists of a set of partial differential equations for the transport of heat and mass fractions of eight chemical species to describe the onset of self-ignition and the propagation of smouldering fires in deposits of bulk materials or dust accumulations. The chemical reaction sub-model includes solid fuel decomposition and the combustion of char, carbon monoxide and hydrogen.The model has been validated against lab-scale self-ignition and smouldering propagation experiments and then applied to predictions of fire scenarios in a lignite coal silo. Predicted reaction temperatures of 550 K and propagation velocities of the smouldering front of about 6 mm/h are in good agreement with experimental values derived from lab-scale experiments. |
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