Detailed analysis of flame propagation during dust explosions by UV band observations |
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| Institution: | 1. INERIS, Accidental Risks Division, Parc ALATA, BP 2, F-60550 Verneuil en Halatte, France;2. Laboratoire Réactions et Génie des Procédés, Université de Lorraine, UMR 7274 CNRS, 1 rue Granville, BP 20451, F-54001 Nancy, France;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211800, China;2. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing Tech University, Nanjing, 211800, China;1. College of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning, 110819, China;2. College Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong, 266590, China;3. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, NO. 3-11, Wenhua Road, Heping District, Shenyang, Liaoning, 110819, China;4. Acrylic Fiber Plant of CNPC Daqing Petrochemical Co., Ltd., No.93, Huagong Road, Xinghua Street, Longfeng District, Daqing, Heilongjiang, 163714, China;1. School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China;2. School of Chemical Engineering, Jiangsu Ocean University, Lianyungang 222005, China |
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| Abstract: | It is important to sufficiently understand the phenomena during the dust explosions in order to take appropriate measures preventing dust explosion accidents. However, at present basic knowledge on flame propagation mechanisms during dust explosions is not enough. In this study, therefore, the flame propagation mechanisms during dust explosions are examined by detailed analyses using a special observation at UV band. Small scale experiments were performed to analyze flame propagating processes in detail. In the experiments, the stearic acid was used as the combustible particle, suspended particles were ignited by an electric spark, and flame propagation through the combustible dust was observed by using a special observation system at UV band. The leading combustion zone is observed to consist of discrete burning blue spot flames by the observation using ordinary photograph system. It is questionable how the leading flame of such discrete structure propagates. In this study, high-speed video images at UV band through a band-pass filter were taken to detect OH emission from combustion reaction zone. Using this method, the propagating flame could be detected clearly and the flame propagation mechanism could be examined in detail. In the conditions performed in this study, discrete flame propagation was not observed and the leading flame was observed to propagate continuously. This result is of importance for understanding the flame propagation phenomena during dust explosion. |
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