Effects of combined porous media on quenching and re-ignition characteristics of methane/air premixed combustion in a duct |
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| Institution: | 1. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, PR China;2. State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo, 454003, Henan, PR China;3. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, 454003, Henan, PR China;1. Université de Lorraine, CNRS, LRGP, Nancy, France;2. INERIS, Parc Technologique ALATA, BP 2, F-60550, Verneuil-en-Halatte, France;1. School of Safety Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;2. Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Education Ministry, Anhui University of Science and Technology, Huainan, Anhui 232001, China;3. College of Safety Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, 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. State Key Laboratory of Coal Resources and Safety Mining, China University of Mining and Technology -Beijing, Beijing, 100083, China;2. College of Resource and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China;3. School of Safety Engineering, North China Institute of Science and Technology, Sanhe, 065201, China;1. Joint Institute for High Temperatures of Russian Academy of Science, 125412, Izhorskaya str., 13, build. 2, Moscow, Russia;2. Bauman Moscow State Technical University, 105005, 2nd Baumanskaya str., 5, Moscow, Russia |
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| Abstract: | During the study of foam metal suppression of methane combustion in ducts, it was found that under certain conditions, after the flame is extinguished, a re-ignition phenomenon occurs in the area upstream of the foam metal. In this paper, the process and mechanism for the occurrence of this phenomenon were investigated. The porous media used in the experiments is a two-layer structure consisting of a combination of iron-nickel foam and copper foam and was mounted in a transversal position. Each layer of foam metal has a thickness of 5 mm and a pore size of 20 or 40 holes pores per inch (ppi). The results show that flame extinguishment and re-ignition are highly dependent on the material and pore density of the porous media used. After the flame was quenched by the combination of iron-nickel foam with the same pore density of 40ppi, the re-ignition intensity was higher (a dazzling white light could be observed) and the flame area was larger. However, when a combination of iron-nickel foam with different pore densities was used, the re-ignition intensity, flame oscillation frequency and amplitude were significantly lower. However, both re-ignition flames can last for a long time. In addition, the incorporation of copper foam with high thermal conductivity resulted in the decay of flame propagation speed and the overpressure before and after quenching increased significantly with the increase of pore density of the first layer of iron-nickel foam. |
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| Keywords: | Porous media Re-ignition Quenching Flame oscillation Methane/air premixed combustion |
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