Propagation of smouldering in dust deposits caused by glowing nests or embedded hot bodies |
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| Institution: | 1. Federal Institute for Materials Research and Testing (BAM), D-12200 Berlin, Germany;2. Otto-von-Guericke University, D-39016 Magdeburg, Germany;1. Institute of New Energy Science and Engineering, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. Key Laboratory of Flow Control and Simulation, School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;3. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;1. Key Lab of Computing and Communication Software of Anhui Province School of Computer Science and Technology, University of Science and Technology of China, Hefei, 230027 Anhui, PR China;2. Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, 12180 NY, USA;1. National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk 634050, Russia;2. Université Libre de Bruxelles, CP165/62, Avenue F.D. Roosevelt 50, B-1050 Brussels, Belgium |
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| Abstract: | Smouldering fires in storage equipment are often caused by glowing nests or embedded hot bodies. Due to large temperature gradients near the glowing nest in a deposit of bulk material the detection of a smouldering fire is difficult and the smouldering fire may remain unnoticed until the reaction front breaks through the surface of the deposit. The present paper reports experimental investigations on thermal conditions, which may cause or promote an ongoing smouldering process, e.g. critical initial temperatures of embedded hot bodies or critical initial sizes of glowing nests. Propagation velocities of smouldering fires were dependent on the sample size, the oxygen content within the sample and on the caloric properties of three combustible dusts. |
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