The influence of inert gas on limiting experimental safe gap of fuel-air mixtures at various initial pressures |
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| Institution: | 1. “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 202 Spl. Independentei, 060021, Bucharest, Romania;2. Physikalisch-Technische Bundesanstalt (PTB), 100 Bundesallee, 38116, Braunschweig, Germany;1. National Engineering Research Center of Electric Vehicles, Beijing Institute of Technology, Beijing 100081, China;2. Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education, School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;1. College of Petroleum & Gas Engineering, Southwest Petroleum University, Chengdu, 610500, PR China;2. Key Laboratory of Deep Underground Science and Engineering (Ministry of Education), College of Architecture and Environment, Sichuan University, Chengdu 610500, PR China;3. Sichuan Development Guorun Water Investment Co., Ltd., Chengdu, 610500, PR China;4. Petroleum Engineering Supervision Center of Southwest Petroleum Branch, SINOPEC, No. 398, South Taishan Road, Jingyang District, Deyang 618000, China;1. Department of Safety Engineering, College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China;2. University Gustave Eiffel, UPEC, CNRS, Laboratory Multi Scale Modeling and Simulation, (MSME/UMR 8208), 5 bd Descartes, 77454, Marne-la-Vallee, France;3. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China;4. Process Safety and Disaster Prevention Laboratory, National Yunlin University of Science and Technology, Douliou, Yunlin, 64002, Taiwan, ROC |
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| Abstract: | The Maximum Experimental Safe Gap (MESG) is an important criterion to assess the propagation of flames through small gaps. This safety-related parameter is used to classify the flammable gases and vapors in explosion groups, which are fundamental to constructional explosion protection. It is used both, for the safe design of flameproof encapsulated devices as well as for selecting flame arresters appropriate to the individual application. The MESG of a fuel is determined experimentally according to the standard ISO/IEC 80079-20-1:2017 at normal conditions (20 °C, 1.0 bar) with air as oxidizing gas. The aim of this work is to investigate the effect of inert gas addition on the MESG in order to assess the effectiveness of inertization in constructional explosion protection. The term limiting experimental safe gap (SG) is used for the result of these measurements. The fuel-air mixtures (fuels: hydrogen, ethylene, propene, methane) used as representatives for the explosion groups in flame arrester testing were chosen and diluted with inert gas (nitrogen, carbon dioxide) before testing. The dependence of the limiting experimental safe gap on the total initial pressure, amount and nature of inert additive is discussed. The initial pressure was varied up to 2.0 bar to include increased pressure conditions used in flame arrester testing. Apart from the well-known reciprocal dependence on the initial pressure, the added inert gas results in an exponential increase of SG. This effect depends on the inertizing potential of the gas and is therefore different with nitrogen and carbon dioxide. The ranking of the fuels is the same as with MESG. As a result, various mixtures of the same limiting experimental safe gap can now be chosen and tested with an individual flame arrester to prove the concept of a constant and device-related limiting safe gap. The work was funded by BG-RCI in Heidelberg (PTB grant number 37056). |
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| Keywords: | Inert gas Hydrogen Methane Propane Ethylene Maximum experimental safe gap |
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