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《The Chinese Journal of Geological Hazard and Control》 2015-02
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Numerical simulation of gas transport law in process of sealing fire zone

ZHOU Xihua;LI Chengyu;ZHANG Lili;SONG Dongping;MEN Jinlong;School of Safety Science & Engineering,Liaoning Technical University;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education;Xinjiang Institute of Engineering;  
In order to study the gas transport law in the process of sealing fire zone,the flow field of fire zone was stimulated by COMSOL software. The change laws of velocity field,gas,CO and O2 concentration field in the center of vertical section in tunnel were studied,as average wind speed of the entrance was separately set as 1. 5 m / s、1 m / s、0. 5 m / s、0. 25 m / s and 0. 1 m / s. The results show: during the sealing fire zone,the maximum wind speed section gradually decreases with the falling of average wind speed at the entrance,thickness of back-flow layer,length of back-flow and maximum current speed rise with the declining of the average wind speed at the entrance; the highest gas concentration in the fire area and on the side of leeward goes up with the decreasing of the entrance average wind speed; the concentration of CO section located on the side of fire leeward and upwind ascends with the dropping of average wind speed at the entrance,the concentration of O2 section located on the side of fire leeward reduces with the falling of the entrance average wind speed. According to the results stimulated,we can determine the gas explosion danger area,it plays a guiding role in closing fire zone in practice.
【CateGory Index】: TD712.7
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