Effect of flame propagation regime on pressure evolution of nano and micron PMMA dust explosions |
| |
| Institution: | 1. Key Laboratory of Coal Methane and Fire Control (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, China;2. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;1. School of Safety Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China;2. Beijing Academy of Safety Engineering and Technology, Beijing, 102617, China;3. Department of Foreign Languages, Beijing Institute of Petrochemical Technology, Beijing, 102617, China;1. GexCon AS, Bergen, Norway;2. University of Bergen, Bergen, Norway;3. Mary Kay O''Connor Process Safety Center, TX, USA;4. Texas A&M University, College Station, TX, USA;1. School of Chemical Machinery, Dalian University of Technology, Dalian, Liaoning 116024, PR China;2. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, PR China;1. School of Chemical Machinery, Dalian University of Technology, Dalian, Liaoning 116024, PR China;2. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, PR China;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, China;2. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing Tech University, Nanjing, 211816, China |
| |
| Abstract: | Experiments using an open space dust explosion apparatus and a standard 20 L explosion apparatus on nano and micron polymethyl methacrylate dust explosions were conducted to reveal the differences in flame and pressure evolutions. Then the effect of combustion and flame propagation regimes on the explosion overpressure characteristics was discussed. The results showed that the flame propagation behavior, flame temperature distribution and ion current distribution all demonstrated the different flame structures for nano and micron dust explosions. The combustion and flame propagation of 100 nm and 30 μm PMMA dust clouds were mainly controlled by the heat transfer efficiency between the particles and external heat sources. Compared with the cluster diffusion dominant combustion of 30 μm dust flame, the premixed-gas dominant combustion of 100 nm dust flame determined a quicker pyrolysis and combustion reaction rate, a faster flame propagation velocity, a stronger combustion reaction intensity, a quicker heat release rate and a higher amount of released reaction heat, which resulted in an earlier pressure rise, a larger maximum overpressure and a higher explosion hazard class. The complex combustion and propagation regime of agglomerated particles strongly influenced the nano flame propagation and explosion pressure evolution characteristics, and limited the maximum overpressure. |
| |
| Keywords: | Nano and micron dust explosions Flame propagation regime Explosion pressure evolution Combustion reaction intensity Flame temperature distribution |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
