Effect of droplet size on the inhibition of methane/air explosion process by ultrafine water mist

被引：0
|
作者：
Cao X. [1 ]
Ren J. [1 ]
Bi M. [1 ]
Jiang H. [1 ]
Li Y. [1 ]
机构：
[1] School of Chemical Machinery and Safety Engineering, Dalian University of Technology, Dalian
来源：
Bi, Mingshu (bimsh@dlut.edu.cn) | 1600年 / China Coal Society卷 / 42期
关键词：
Heat exchange; Methane/air explosion; Numerical simulation; Ultrafine water mist;
D O I：
10.13225/j.cnki.jccs.2016.1387
中图分类号：
学科分类号：
摘要：
Three dimensional numerical model of methane-air explosion was established by using the large eddy simulation model. The processes of water mist evaporation and vaporization and the exchanges of the mass, momentum and heat between the gas and liquid phases were considered. The continuous phase and discrete phase were calculated through the Euler-Lagrange model respectively and alternately solving two phases control equation to realize the gas-liquid two phases coupling solution. The effects of the mist size on the interaction extent and the heat exchange rate of explosion reaction zone were analyzed, and the optimum size for explosion suppression was obtained and the reason of the suppression effect difference was explained respectively. The effect of mist size on gas-liquid two phase heat exchange rate was affected through the interaction extent of the flame reaction zone, the droplet and the evaporation rate; thereby the flame propagation speed and explosion intensity were affected obviously. The condition of mist size selection was that the mist should be completely vaporized in the reaction zone in order to effectively realize explosion suppression. © 2017, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：2376 / 2384
页数：8
相关论文
共 18 条
  • [1] Lu J., Liu J., Present status and development of mine disaster prevention and control technology, Coal Science and Technology, 34, 5, pp. 1-5, (2006)
  • [2] Adiga K.C., Willauer H.D., Ananth R., Et al., Implications of droplet breakup and formation of ultrafine mist in blast mitigation, Fire Safety Journal, 44, pp. 363-369, (2009)
  • [3] Ingram J.M., Averill A.F., Battersby P.N., Et al., Suppression of hydrogen/oxygen/nitrogen explosions by fine water mist: Part 1. Burning velocity, International Journal of Hydrogen Energy, 37, pp. 19250-19257, (2017)
  • [4] Zhu D., Liang D., Liu J., Numerical simulation of ultra-fine water mist extinguishing mechanism, Procedia Engineering, 71, pp. 28-33, (2014)
  • [5] Hiroshi S., Manai T., Yasuo Y., Et al., Experiments and numerical simulation on methane flame quenching by water mist, Journal of Loss Prevention in the Process Industries, 14, 6, pp. 603-608, (2001)
  • [6] Parra T., Castro F., Mendez C., Et al., Extinction of premixed methane-air flames by water mist, Fire Safety Journal, 39, 7, pp. 581-600, (2004)
  • [7] Tseng C.C., Viskanta R., Enhancement of water droplet evaporation by radiation absorption, Fire Safety Journal, 41, pp. 236-247, (2006)
  • [8] Ananth R., Willauer H.D., Farley J.P., Et al., Effects of fine water mist on a confined blast, Fire Technology, 46, 3, pp. 641-675, (2010)
  • [9] Zhang Z., Cui G., Xu C., Theory and Application of Turbulent Flow Large Eddy Simulation, (2008)
  • [10] Rao A.V., Dynamics of Particles and Rigid Bodies, (2006)
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