Effects of nitrogen and carbon dioxide on hydrogen explosion behaviors near suppression limit |
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| Institution: | 1. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo, China;2. Coal Production Safety Collaborative Innovation Center in Henan Province, Henan Polytechnic University, Jiaozuo, China;3. Safety Technology Training Institute, Henan Polytechnic University, Jiaozuo, China;4. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China;1. School of Safety Science & Engineering, Xi''an University of Science and Technology, 58, Yanta Mid. Rd., Xi''an, 710054, Shaanxi, PR China;2. School of Safety Engineering, Beijing Institute of Petrochemical Technology, 19, Qingyuan North Rd., Beijing, 102617, PR China;1. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing, 210000, China;2. China Automotive Technology and Research Center Co., Ltd., Tianjin, 300000, China |
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| Abstract: | By varying inert gas content, equivalence ratio and initial pressure, this study is aimed at investigating flame propagation behaviors and explosion pressure characteristics near suppression limit. For carbon dioxide, the weakest flame floating phenomenon is observed at Φ = 1.5 and the buoyant instability is enhanced when the equivalent ratio deviates to the rich and lean sides. For nitrogen, the buoyant instability decreases with increasing equivalent ratio. Both maximum explosion pressure and maximum pressure rise rate increase firstly and then decrease with the increase of equivalence ratio, and they decrease significantly with increasing content of carbon dioxide and nitrogen. For carbon dioxide, the critical suppression ratio of Φ = 0.6, 0.8, 1.0, 1.5 and 2.0 is 7.50, 7.18, 5.74, 3.83, and 2.87. For nitrogen, the critical suppression ratio of Φ = 0.6, 0.8, 1.0, 1.5 and 2.0 is 15.83, 11.87, 9.50, 6.33 and 4.75. Compared to nitrogen, the carbon dioxide is more effective on suppressing hydrogen explosion pressure. The adiabatic flame temperature, thermal diffusivity and mole fraction of active radicals continue to decrease with increasing content of carbon dioxide and nitrogen, which contributes to the decrease of laminar burning velocity. |
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| Keywords: | Hydrogen explosion behaviors Suppression limit Buoyancy instability Suppression mechanism |
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