线火源与点火源在巷道火灾中烟流特性对比

发布时间：2018-05-09 02:14

本文选题：矿井巷道 + 线火源　；参考：《辽宁工程技术大学学报(自然科学版)》2017年02期

【摘要】：为揭示井下线火源与点火源诱导火灾的不同,达到有针对性的进行矿井火灾防治,依据两种火源类型的燃烧特性,应用火灾动力学模拟软件FDS,建立了符合井下火灾燃烧特点的矿井平巷火灾模型,模拟对比分析了两类火源在相同火灾场景下烟气运动过程、速度分布及温度衰减规律.研究结果表明:在1.2 m/s风速条件下,线火源在顶棚射流过程中烟气的水平运动速度大于点火源,烟流逆流长度较长;巷道中截面火源附近速度最大,可达3.5 m/s,由于节流作用和输送机的遮挡,上风向顶板附近及输送机后部风速减小.顶板最高温度随火源距离的增大出现衰减,且线火源的衰减速度小于点火源,竖向温度由巷道顶板向底板方向递减.因此,线火源的火灾危害性更大,在火灾防治中应该给予更高的关注.
[Abstract]:In order to reveal the difference between the fire source of underground line and the fire induced by igniting source, the fire prevention and control of mine is carried out according to the burning characteristics of two kinds of fire sources. The fire dynamic simulation software FDS was used to establish a mine roadway fire model in accordance with the characteristics of underground fire combustion. The smoke movement process, velocity distribution and temperature attenuation law of two kinds of fire sources in the same fire scene were compared and analyzed. The results show that under the wind speed of 1.2 m / s, the horizontal velocity of flue gas in the roof jet process is larger than that of the ignition source, and the length of the smoke flow countercurrent is longer, and the velocity near the cross section fire source is the largest in the tunnel. Up to 3.5 m / s, due to throttling and shielding of the conveyor, the wind speed near the upper wind direction roof and the rear part of the conveyor decreased. The maximum roof temperature attenuates with the increase of the fire source distance, and the attenuation speed of the line fire source is smaller than that of the ignition source, and the vertical temperature decreases from the roadway roof to the floor. Therefore, the fire hazard of line fire source is more serious, and more attention should be paid to fire prevention and control.
【作者单位】：辽宁工程技术大学安全科学与工程学院;煤矿重大动力灾害防控协同创新中心;
【基金】：辽宁省重点实验室项目(14-1176)
【分类号】：TD752.2

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