Study on the characteristics of gas explosion affected by induction charged water mist in confined space |
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| Institution: | 1. College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, China;3. Collaborative Innovation Center of Coal Safety Production of Henan Province, Jiaozuo, 454003, China;1. Nanjing Tech University, College of Safety Science and Engineering, China;2. Jiangsu Key Laboratory of Urban and Industrial Safety, College of Safety Science and Engineering, Nanjing Tech University, Nanjing 210009, China;1. State Key Lab of Gas Geology and Control-Cultivation Base, Henan Polytechnic University, Jiaozuo, Henan 454003, China;2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;1. State Key Laboratory Cultivation Bases Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo, Henan 454003, PR China;2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, PR China;2. State Key Laboratory of Safety and Control for Chemicals, Sinopec Research Institute of Safety Engineering, Qingdao, PR China;1. Department of Mechanical Engineering, Tokyo Denki University, 5 Senju-Asahicho, Adachi-ku, Tokyo 120-8551, Japan;2. Fire Prevention Division, Fire and Disaster Management Agency, 2-1-2 Kasumigaseki, Chiyoda-ku, Tokyo 100-8927, Japan |
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| Abstract: | To investigate the suppression effect of charged water mist on gas explosion, a small charged water mist generator and a gas explosion simulation device were designed based on the principle of electrostatic induction. Experiments for testing characteristics of the gas explosion in a confined space under different charged polarities, charged voltages and mist fluxes were carried out. Experimental results indicated that, compared with the normal water mist, the explosion peak overpressure and the flame propagation speed could be more effectively reduced by the charged water mist. And this suppression effect could be promoted by increasing the charged voltage. To visualize the effect of the charged water mist's polarity on gas explosion, comparative experiments were conducted. The results showed that the explosion peak overpressure, the overpressure rising rate, and the propagation speed of the flame were reduced by 64.7%, 33.0% and 19.4%, respectively, when a +8 kV charged voltage was applied. In situation where a -8 kV charged voltage was applied, 64.1%, 26.5% and 16.0% reductions were achieved for the explosion peak overpressure, the overpressure rising rate, and the flame propagation speed respectively. Comparison of this data leads to the conclusion that the gas explosion could be more efficiently suppressed by the positively charged water mist. |
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| Keywords: | Confined space Induction charging Charged water mist Gas explosion |
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