Experimental research on methane/air explosion inhibition using ultrafine water mist containing methane oxidizing bacteria |
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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. School of Civil Engineering, Hefei University of Technology, Hefei 230009, China;2. Anhui’s International Joint Research Center on Hydrogen Safety, Hefei 230009, China;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China;2. State Key Lab of Gas Geology and Control-Cultivation Base, Henan Polytechnic University, Jiaozuo, Henan, 454003, China;3. Northwest Institute of Nuclear Technology, Xi''an, Shanxi, 710024, China |
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| Abstract: | In order to deeply understand the inhibitory effect of ultrafine water mist containing methane-oxidizing bacteria on methane explosion, a small-sized semi-closed visual experimental platform was built. Five different application mist amounts (0.7 mL, 2.1 mL, 3.5 mL, 4.9 mL, 6.3 mL) of ultrafine water mist containing methane-oxidizing bacteria on 9.5% methane explosion were studied experimentally. Ultrafine water mist was generated by the ultrasonic atomization generator, and mist size was measured by a winner319 laser particle size analyzer. During the methane explosion, a high-frequency pressure sensor collected pressure change data, and a high-speed camera recorded the flame development process. The results indicated that the maximum explosion overpressure (ΔPmax) decreased with time, and the arrival time of the maximum explosion overpressure (ΔPmax) delayed. The appearance time of the “tulip” shaped flame delayed, and the flame propagation speed decreased. The ultrafine water mist and deposition can effectively inhibit the methane explosion. The explosion suppression effect of the second step spraying water mist was better. The improvement of the explosion suppression effect of the ultrafine water mist containing methane-oxidizing bacteria was attributed to the degradation effect of the methane-oxidizing bacteria. Under long-term degradation, methane-oxidizing bacteria in water mist play a role in inhibiting methane explosion. |
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| Keywords: | Ultrafine water mist Methane-oxidizing bacteria Methane explosion suppression The primary step spraying water mist The second step spraying water mist |
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