Study of the influence of melamine polyphosphate and aluminum hydroxide on the flame propagation and explosion overpressure of aluminum magnesium alloy dust |
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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. Fire & Explosion Protection Laboratory, Northeastern University, Shenyang 110004, China;3. Department of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China;4. Department of Process Engineering & Applied Science, Dalhousie University, Halifax, NS, Canada;1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, 232001, PR China;2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, PR China;1. School of Chemical Machinery and Safety Engineering, Dalian University of Technology, Dalian 116024, China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, China;3. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;1. Department of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology (YunTech), Douliou, Yunlin, 64002, Taiwan, ROC;2. College of Safety Science and Technology, Xi’an University of Science and Technology, Xi’an, Shaanxi, 710054, China;3. Graduate School of Engineering Science and Technology, YunTech, Douliou, Yunlin, 64002, Taiwan, ROC;4. Centre for Process Safety and Industrial Disaster Prevention, Department and Graduate School of Safety, Health, and Environmental Engineering, YunTech, Douliou, Yunlin, 64002, Taiwan, ROC;1. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;2. Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao 266590, China |
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| Abstract: | When aluminum magnesium alloy dust floats in the air, a certain ignition energy can easily cause an accidental explosion. To prevent and control the occurrence of accidental explosions and reduce the severity of accidents, it is necessary to carry out research on the explosion suppression of aluminum magnesium alloy dust. This paper uses a vertical glass tube experimental device and a 20 L spherical explosive experimental device to carry out experimental studies on the suppression of the flame propagation and explosion overpressure of aluminum magnesium alloy dust with melamine polyphosphate (MPP) and Al(OH)3. With increasing MPP and Al(OH)3 concentrations, the flame brightness darkened, the flame velocity and propagation distance gradually decreased, and Pmax and (dp/dt)max decreased significantly. When the amount of MPP added reached 60%, the flame propagation distance decreased to 188 mm, which is a decrease of 68%, and the explosion overpressure decreased to 0.014 MPa, effectively suppressing the explosion of aluminum magnesium alloy dust. The experimental results showed that MPP was more effective than Al(OH)3 in inhibiting the flame propagation and explosion overpressure of the aluminum magnesium alloy dust. Finally, the inhibitory mechanisms of the MPP and Al(OH)3 were further investigated. The MPP and Al(OH)3 endothermic decomposition produced an inert gas, diluted the oxygen concentration and trapped active radicals to terminate the combustion chain reaction. |
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| Keywords: | Aluminum magnesium alloy dust MPP Flame of explosion Explosion overpressure Suppression mechanism |
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