Suppression of premixed flames with inert particles |
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| Institution: | 1. School of Chemical and Environmental Engineering, North University of China, Taiyuan, Shanxi 030051, PR China;2. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, PR China;3. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China |
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| Abstract: | Dispersal of inert particles on a flame front is one of the techniques employed to suppress explosions. The current study investigates the influence of micron-sized (75–90 μm) inert (sand) particles on the laminar burning velocity of methane-air premixtures of different equivalence ratios (0.9–1.2) and reactant temperatures (297, 350, 400 K) using a Bunsen-burner type experimental apparatus. When an inert particle interacts with the flame zone, it extracts energy from the flame, thereby acting like a heat sink and hence reducing the flame temperature. Results show that for sand particle size in the range of 75–90 μm, a concentration of 380–520 g/m3 is necessary for extinction of a methane-air flame at ambient temperature. An increase in reactant temperature reduces the heat-sink effect necessitating a higher concentration of sand to extinguish the flame. A mathematical model is developed to generalize the results and make them applicable to a wide range of parameters. |
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| Keywords: | Burning velocity Heat sink Premixed flame Inert Sand |
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