Theoretical estimation of the lower flammability limit of fuel-air mixtures at elevated temperatures and pressures |
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| Institution: | 1. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081, Beijing, China;2. School of Chemistry and Chemical Engineering, BOHAI University, 121031, Jinzhou, China;1. Department of Materials Science and Chemical Engineering, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;2. Department of Risk Management, Graduate School of Environmental and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;3. Department of Safety Management, Faculty of Environmental and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;1. São Paulo State University - UNESP, Campus of Guaratinguetá - FEG, Av. Ariberto P. da Cunha, 333 - Guaratinguetá, SP, CEP 12510410, Brazil;2. Federal University of Itajubá – UNIFEI, Mechanical Engineering Institute – IEM, Av BPS, 1303 - Itajubá, MG, CEP 37500903, Brazil;1. School of Safety Science and Engineering, Xi''an University of Science and Technology, 58, Yanta Mid. Rd., Xi’an 710054, Shaanxi, PR China;2. Shaanxi Engineering Research Center for Industrial Process Safety & Emergency Rescue, 58, Yanta Mid. Rd., Xi’an 710054, Shaanxi, PR China;3. Postdoctoral Program, Xi''an University of Science and Technology, Xi’an 710054, Shaanxi, PR China;4. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 58, Yanta Mid. Rd., Xi’an 710054, Shaanxi, PR China |
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| Abstract: | We present an approach for predicting the lower flammability limits of combustible gas in air. The influence of initial pressure and temperature on lower flammability limit has been examined in this study. The lower flammability limits of methane, ethylene and propane in air are estimated numerically at the pressure from one to 100 bar and the temperature from ambient to 1200 K. It was found that the predicted LFLs of methane, ethylene and propane decrease slightly with the elevated pressure at the high temperature. The LFLs variation for methane-air mixture is 0.17, 0.18, 0.18 volume% with the initial pressure from one to 100 bar at the initial temperature of 800 K, 1000 K and 1200 K respectively, which is significantly higher than that at lower temperature. And the LFL of methane-air mixture at 1200 K and 100 bar reaches 1.03 volume% which is much lower than that at 1 bar and ambient temperature. On the other hand, the LFLs variation is 0.11–0.12 volume% for ethylene-air mixture and 0.06–0.07 volume% for propane-air mixture with the initial temperature from 800 K to 1200 K at the same range of pressure. The LFL values at high temperatures and pressures represent higher risk of explosion. |
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| Keywords: | Lower flammability limits Adiabatic flame temperature High temperature High pressure Explosion |
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