The influence of the charge-to-mass ratio of the charged water mist on a methane explosion |
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| Institution: | 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. School of Energy Engineering, Xi''an University of Science &Technology, Xi''an 710054, China;2. Key Laboratory of Western Mine Exploitation and Hazard Prevention with Ministry of Education, Xi''an 710054, China;3. Qinghe Branch of Hebei Natural Gas Company Limited, Shijiazhuang 050000, 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;1. East China University of Science and Technology, State Environmental Protection Key Laboratory of Risk Assessment and Control on Chemical Process, Shanghai 200237, PR China;2. East China University of Science and Technology, Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, Shanghai 200237, PR China;3. College of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, PR China;1. Henan Polytechnic University, School of Safety Science and Engineering, State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo 454003, PR China;2. Henan Polytechnic University, Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, PR China;1. State Key Laboratory Cultivation Bases Gas Geology and Gas Control (Henan Polytechnic University), Jiaozuo, Henan 454000, PR China;2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China;3. The Collaboration Innovation Center of Coal Safety Production of Henan Province, Jiaozuo, Henan 454000, PR China |
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| Abstract: | To study the influence of the charge-to-mass ratio of a charged water mist on a methane explosion, the induction charging method was used to induce charge on a normal water mist; a mesh target method was employed to test the charge-to-mass ratio of its droplets. The propagation images, propagation average velocities, and overpressures of a methane explosion suppressed by charged water mist were analysed. The influence of the charge-to-mass ratio of the suppressant water mist on a methane explosion was studied. Results show that the explosion temperature, propagation average velocity, and peak overpressure deceased more obviously with charged water mist than ordinary water mist. With increasing charge-to-mass ratio, the suppression effect of the charged water mist underwent a significant increase. Under experimental conditions, compared with ordinary water mist, when the charge-to-mass ratio was 0.445 mC/kg and the mist flux was 4 L, the minimum flame propagation average velocity was 3.456 m/s, with a drop of 2.37 m/s (40.68%), and the peak overpressure of the methane explosion was 10.892 kPa, with a drop of 10.798 kPa (49.78%). The suppression effect is considered from the changes of the physico-chemical properties of the water mist as affected by the applied charge-to-mass ratio. |
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| Keywords: | Charge-to-mass ratio Charged water mist Methane explosion Propagation average velocity Explosion overpressure |
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