风量对独头掘进巷道中部顶板火灾影响研究
Study on the influence of air volume on roof fire in the middle of single heading roadway
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摘要: 为研究独头巷道中部顶板火灾初期时局部通风机风量调节对人员避灾的影响，用PyroSim软件对450、675、900、1 125、1 350、1 575、1 800 m3/min 7种风量工况下巷道内烟流、温度、CO体积分数和能见度的分布情况进行模拟分析。研究得出：顶板火灾烟流直接沿顶板向两端射流，无上升羽流现象，当风量低于临界风速时，烟流逆退距离和烟流厚度随风量增加逐渐减小；顶板火灾稳定后，当存在烟流逆退时，沿纵向方向，CO体积分数、能见度峰值在烟流前锋后一定区域而温度峰值在火源附近，火源上风向巷道存在高温区和环境温度区，而下风向巷道各参数整体较为稳定；在火源下方，温度随高度增加总体呈升高趋势而能见度呈减低趋势；随风量增加,巷道内2 m高处温度峰值减小、最低能见度增加而CO体积分数峰值先增加后降低，且三者峰值位置均向出口方向移动；从人员逃生角度看，通风量越大越有利于逃生，1 350 m3/min时即可满足逃生条件。Abstract: In order to study the influence of local fan air volume on personnel disaster avoidance in the early stage of roof fire in the middle of single heading roadway, PyroSim software was used to analyze the distribution of smoke flow, temperature, CO concentration and visibility in the roadway under seven working conditions of 450 m3/min, 675 m3/min, 900 m3/min, 1 125 m3/min, 1 350 m3/min, 1 575 m3/min and 1 800 m3/min. The results show that the roof fire smoke flows directly to both ends along the roof, with no rising plume phenomenon, when the air volume is lower than the critical wind speed, the backflow length and smoke flow thickness gradually decrease with the increase of ventilation air volume. When the roof fire is stable and there is smoke backflow, along the longitudinal direction, the peak values of CO concentration and visibility are in a certain area behind the smoke front, while the peak value of temperature is below the fire source, and there is a high temperature zone and environmental temperature zone in the upwind direction of the fire source, while the smoke density, temperature, CO concentration and visibility in the exit direction are relatively stable; under the fire source, the temperature increases with the increase of height, while the visibility decreases; with the increase of wind volume, the peak values of temperature at 2 m gradually decrease, the minimum visibility in the roadway gradually increase, while the CO concentration first increases and then decreases, and the peak positions of the three parameters move towards the outlet. From the perspective of personnel escape, it is concluded that the greater theventilation is, the more conducive to escape, and 1 350 m3/min can meet the escape conditions.
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Keywords:
- local ventilation /
- air volume /
- single heading roadway /
- roof fire /
- numerical simulation /
- disaster avoidance
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