Influence of different ignition delay times on the pressure rise rate in hybrid mixture explosions in the 20-L sphere |
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| Affiliation: | 1. Physikalisch-Technische Bundesanstalt, Bundesallee 100, DE-38116, Braunschweig, Germany;2. Otto von Guericke University, Universitätsplatz 2, DE-39106, Magdeburg, Germany;1. Université de Lorraine, CNRS, LRGP, Nancy, France;2. INERIS, Parc Technologique ALATA, BP 2, F-60550, Verneuil-en-Halatte, France;1. College of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China;2. Chongqing University of Science and Technology, Chongqing, 401331, China;3. The Mining Limited Company of Yiliang Chihong, Zhaotong, Yunnan, 657000, China;4. Key Laboratory of Mine Thermo-motive Disaster and Prevention, Ministry of Education, Huludao, Liaoning, 125105, China;5. College of Safety Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui, 232001, China;1. ETSI Minas y Energía, Universidad Politécnica de Madrid, Madrid, Spain;2. Laboratorio Oficial JM de Madariaga, Universidad Politécnica de Madrid, Getafe, Spain |
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| Abstract: | ![]()
For the development of a standardized method for measuring the explosion safety characteristics of combustible hybrid dust/vapor mixtures, the influence of the ignition delay time needs to be investigated. The ignition delay time, defined as the time between the injection of dust and the activation of the ignition source, is related to the turbulence of the mixture and thus to the pressure rise rate. The ignition source for pure vapors, however, has to be activated in a quiescent atmosphere according to the standards. Nevertheless, when measuring the explosion safety characteristics of hybrid mixtures, it is important that the dust be in suspension around the igniter. Like pure dust/air mixtures, hybrid dust/vapor/air mixtures need to be ignited in a turbulent atmosphere to keep the dust in suspension.This work will therefore investigate the influence of ignition delay times on the severity of hybrid explosions. It was generally found that at shorter ignition delay times, (dp/dt)ex increased due to higher turbulence and decreases as the dust sinks to the bottom of the 20 L-sphere. This effect is more pronounced for hybrid mixtures with higher vapor content compared to dust content. |
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| Keywords: | Hybrid explosions Safety characteristics Ignition delay time 20-L sphere |
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