基于Ventsim的井下火灾模拟研究

Fire Modeling in Underground Mines Using Ventsim Visual VentFIRE Software

井下事故中矿井火灾是最严重的事故类型之一。为更好地控制火灾时期风流的扩散以及相关应急预案的制定,利用Ventsim可视化通风软件建立金属矿山通风系统三维模型。研究结果表明:相同燃烧环境下,不同材料燃烧产生的CO浓度呈现相同变化趋势:先增加后减少,然后增加至最大值,最后减小并趋近零。橡胶、柴油、干木柴燃烧释放的CO浓度最高约至13003、12742、8779ppm,可见橡胶产生的CO浓度明显高于柴油和木柴;热释放量方面,柴油燃烧释放的热量最高约至26500kW,明显高于木柴和橡胶;距离火源不同地点热和CO随时间变化规律不同,其中与回风巷直接相连的巷道因热膨胀等因素造成风流逆向,其CO气体在火灾中期出现浓度趋近于零的现象。

Underground mine fire accident is one of the most serious types of accidents, according to related documents and information. The author have built three-dimensional models of metal mine ventilation system by using the Ventsim ventilation visualization software for the sake of optimizing control of air current during fires and making related emergency plans. The results show that： the CO concentration in the combustion of different materials has showed the same trend： the figures increase firstly and then decrease, before rising to a top, which is followed by a decent to zero, under the same experiment conditions. The maximum of CO concentrations released by the combustion of rubber, diesel and dry firewood are at approximately 13003ppm, 12742ppm, 8779ppm respectively, which illustrate that the data produced by rubber was significantly higher than that of the other materials; as for the heat release, the highest level is at nearly 26500kw, produced by burning diesel fuel, which is obviously higher than that of rubber and firewood; the results posted a difference between the heat distribution by the distance and the CO variation over time, and the most important reason of the case of roadway which is directly connected with the return airway is air follow reverse caused by thermal expansion and other factors, whose CO concentration was closed to zero finally.