Experimental study on CO2/CF3I suppression of methane-air explosion and flame propagation |
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| Institution: | 1. Xi''an University of Science and Technology, Xi''an, 710054, Shaanxi, China;2. Xi''an Key Laboratory of Urban Public Safety and Fire Rescue, Xi''an, 710054, Shaanxi, China;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. UFRJ, Brazil;2. ANP, Brazil;1. School of Emergency Management and Safety Engineering, China University of Mining and Technology - Beijing, D11 Xueyuan Road, Haidian District, Beijing, 100083, China;2. China Oil & Gas Pipeline Network Corporation, 5 Dongtucheng Road, Chaoyang District, Beijing, 100020, China;1. College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China;2. Saifeite Engineering Group Co. Ltd., Qingdao, 266061, China;3. Department of Safety, Health, And Environmental Engineering, National Yunlin University of Science and Technology, Yunlin, 64002, Taiwan, ROC;1. Laboratoire de L’Ingénierie de La Sécurité Industrielle et de Développement Durable, Institut de Maintenance et de Sécurité Industrielle, Université Mohamed Ben Ahmed Oran 2, Sécurité Industrielle et Environnement, Oran, 31000, Algeria;2. Laboratoire Matériaux LABMAT, Ecole Nationale Polytechnique D’Oran- Maurice Audin, Oran, 31000, Algeria |
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| Abstract: | To explore the inhibitory effects of CF3I and CO2 gas on the explosion pressure and flame propagation characteristics of 9.5% methane, a spherical 20 L experimental explosion device was used to study the effect of the gas explosion suppressants on the maximum explosion pressure, maximum explosion pressure rise rate and flame propagation speed of methane. The results indicated that with a gradual increase in the volume fraction of the gas explosion suppressant, the maximum explosion pressure of methane and maximum explosion pressure rise rate gradually decreased, and the time taken to reach the maximum explosion pressure and maximum explosion pressure rise rate was gradually delayed. At the same time, the flame propagation speed gradually decreased. Additionally, the time taken for the flame to reach the edge of the window and the time taken for a crack as well as a cellular structure to appear on the flame surface was gradually delayed. The fluid dynamics uncertainty was suppressed. The explosion pressure and flame propagation processes were markedly suppressed, but the flame buoyancy instability was gradually enhanced. By comparing the effects of the two gas explosion suppressants on the pressure and flame propagation characteristics, it was found that at the same volume fraction, trifluoroiodomethane was significantly better than carbon dioxide in suppressing the explosion of methane. By comparing the reduction rates of the characteristic methane explosion parameters at a volume fraction of 9.5%, it was observed that the inhibitory effect of 4% trifluoroiodomethane on the maximum explosion pressure was approximately 4.6 times that of the same amount of carbon dioxide, and the inhibitory effect of 4% trifluoroiodomethane on the maximum explosion pressure rise rate and flame propagation speed was approximately 2.7 times that of the same amount of carbon dioxide. The addition of 0.5%–1.5% trifluoromethane to 4% and 8% carbon dioxide can improve the explosion suppression efficiency of carbon dioxide. This enhancing phenomenon is a comprehensive manifestation of the oxygen-decreasing effect of carbon dioxide and the trifluoroiodomethane-related endothermic effect and reduction in key free radicals. |
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| Keywords: | Methane explosion Gas explosion suppression Explosion pressure Flame propagation |
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