Suppression of flame propagation in a long duct by inertia isolation with inert gases |
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| Institution: | 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 Key Laboratory of Prevention and Control of Coal Fire, 58, Yanta Mid. Rd, Xi''an, 710054, Shaanxi, PR China;3. Shaanxi Engineering Research Center for Industrial Process Safety & Emergency Rescue, 58, Yanta Mid. Rd., Xi''an, 710054, Shaanxi, PR China;4. Journal Center, Xi''an University of Science and Technology, 58, Yanta Mid. Rd., Xi''an, 710054, Shaanxi, PR China;1. East China University of Science and Technology, State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China;2. Beijing Institute of Petrochemical Technology, Beijing 102617, China;1. Jiangsu Key Laboratory of Urban and Industrial Safety, Institute of Safety Engineering, Nanjing Tech University, Nanjing 210009, China;2. Department of Fire Protection Engineering, University of Maryland, College Park, MD 20740, USA;3. Department of Safety Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China |
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| Abstract: | Experimental studies were done with a small pipe with a diameter of 0.043 m and a large pipe with a diameter of 0.49 m to demonstrate the flame propagation suppression with inertia isolation in a long duct. Tests were carried in an ignition section containing propylene/air mixture near stoichiometric concentration and generating a peak flame propagation speed of approximately 100 m/s. The ignition section is connected to a section filled with an inert gas, another section with flammable mixtures, and finally a sufficiently long, ambient section to accommodate flame propagation. The critical length of the inert gas section required for successful suppression of flame from the igniting the flammable section is found to be 0.6 m for CO2 and 0.9 m for N2 in the large pipe and 0.2 m for CO2 and 0.3 m for N2 in the small pipe. Additional tests with a 3 m of ignition section and peak flame propagation speed of 225 m/s showed that the critical length for successful suppression by CO2 is only increased slightly to 0.9 m, confirming that the suppression is a result of inertia isolation rather than inert gas dilution. Finally, application of the results in responding to large-scale leak into a long, underground duct is discussed. |
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| Keywords: | Flame propagation Long duct Suppression Inertia isolation Propylene |
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