Inhibition effect on the ignition and flame propagation characteristic of methane explosion by N2/ultrafine water mist

被引：0
|
作者：
Pei B. [1 ,2 ]
Li S. [2 ]
Wei S. [2 ]
Kang Y. [2 ]
Pan R. [1 ,2 ]
Lu C. [1 ,2 ]
Jing G. [2 ]
机构：
[1] Collaborative Innovation Center of Coal Wok Safety and Clean High Efficiency Utilization, Henan Polytechnic University, Henan, Jiaozuo
[2] College of Safety Science and Engineering, Henan Polytechnic University, Henan, Jiaozuo
来源：
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | 2023年 / 52卷 / 02期
关键词：
flame instability; inhibitory mechanisms; methane explosion; minimum ignition energy; nitrogen; ultrafine water mist;
D O I：
10.13247/j.cnki.jcumt.20210772
中图分类号：
学科分类号：
摘要：
In order to improve the explosion suppression effect of water mist, the effects of a single inhibitor and their combination on the minimum ignition energy, flame propagation behavior and instability of methane/air explosion were studied by varying the N2/ultrafine water mist concentration using a constant volume combustion bomb and a precise ignition energy control instrument. The explosion suppression mechanism was discussed by using chemical dynamics software. The results show that after adding N2/ultra-fine water mist, the minimum ignition energy of methane/air premixed gas is significantly increased. The explosion overpressure and the maximum pressure rise rate are reduced, the arrival time of pressure peak and the time of flame formation are prolonged, the flame floats obviously, the number of flame cells are reduced, the length of Maxstein is increased, and the flame propagation speed is significantly increased, which indicating that the combination of N2/ultra-fine water mist can better inhibit the flame instability at the initial stage of methane/air explosion, and the inhibition effect on flame propagation is better than that of a single inhibitor, which can effectively prevent flame acceleration and even detonation. N2/ultrafine water mist can effectively reduce the peak value of production rate and molar fraction of active radicals such as H •, O •, • OH, and the absolute value of temperature sensitivity coefficient is greatly reduced, which indicating that the combination of N2/ultra-fine water mist can effectively reduce the explosion sensitivity and intensity of methane/air premixed gas, and effectively inhibit the ignition of methane/air premixed gas and the process of explosive chain reaction. © 2023 China University of Mining and Technology. All rights reserved.
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页码：329 / 341
页数：12
相关论文
共 40 条
  • [1] ZHANG Xuebo, GAO Jianliang, SHEN Shuaishuai, Et al., Numerical simulation of large scale shock wave propagation in mine[J], Journal of China University of Mining & Technology, 50, 4, pp. 676-684, (2021)
  • [2] JING Guoxun, ZHU Sijia, HE Xiang, Experimental study on gas explosion propagation law in T-shaped pipeline under different sealing conditions[J], China safety Production Science and Technology, 17, 7, pp. 84-90, (2021)
  • [3] YANG Ya, YANG Shigang, FANG Qin, Et al., Numerical simulation of large volume natural gas explosion load in open space [J], Journal of China University of Mining &. Technology, 49, 3, pp. 479-487, (2020)
  • [4] WEN X P, WANG M M, WANG F H, Et al., Combined effects of obstacle and fine water mist on gas explosion characteristics, Chinese Journal of Chemical Engineering, 40, pp. 131-140, (2021)
  • [5] HUANG Jiguang, MA Hanpeng, FAN Chunjiao, Et al., Statistical analysis and prediction of coal mine safety accidents in China[J], Shaanxi Coal, 39, 3, pp. 34-39, (2020)
  • [6] JING Q, WANG D, LIU Q M, Et al., Inhibition effect and mechanism of ultrafine water mist on CH4 /air detonation: Quantitative research based on CFD technology, Process Safety and Environmental Protection, 148, pp. 75-92, (2021)
  • [7] STEEPHAN P, FELIX S, SASCHA V, Et al., Experimental investigation of the impact of water mist on high-speed non-premixed horizontal methane jet fires, Fire Safety Journal, 114, (2020)
  • [8] ZHUANG Y J, ZHANG H W., Effects of water droplet evaporation on initiation, propagation and extinction of premixed spherical flames [J], International Journal of Multiphase Flow, 117, pp. 114-129, (2019)
  • [9] ZHANG W K, GUO X L, CHEN Z., Effects of water vapor dilution on the minimum ignition energy of methane, n-butane and n-decane at normal and reduced pressures[J], Fuel, 187, pp. 111-116, (2017)
  • [10] WEN X P, WANG MM, SU T F, Et al., Suppression effects of ultrafine water mist on hydrogen/methane mixture explosion in an obstructed chamber[J], International Journal of Hydrogen Energy, 44, 60, pp. 32332-32342, (2019)
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