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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.
In order to reveal the difference between underground fire source and ignition source induced fire, targeted mine fire prevention and control was achieved. Based on the combustion characteristics of two types of fire sources, the fire dynamic simulation software FDS was used to establish a fire extinguishing system Coal mine roadway fire model, the law of flue gas movement, velocity distribution and temperature decay of two kinds of fire sources under the same fire scene were simulated and compared.The results show that under the wind speed of 1.2 m / s, During the process, the horizontal velocity of flue gas is greater than that of the ignition source, and the length of the countercurrent of the smoke flow is longer. The maximum velocity near the fire source in the roadway reaches up to 3.5 m / s. Due to the throttling effect and the obstruction of the conveyor, The wind speed at the rear of the conveyor decreases.The maximum temperature of the roof decays with the increase of the distance from the source of ignition and the attenuation speed of the source of ignition is less than that of the ignition source.The vertical temperature decreases from the roof to the floor of the roadway.Therefore, More harmful, in the fire prevention and treatment should give more attention.