细水雾对于油盘火的灭火机理实验研究

Experimental study on fire extinguishing mechanism of oil pan by water mist

利用烟气分析仪、热电偶温度测试仪对高压细水雾系统的窒息作用对于油盘火灭火效果的影响进行了实验研究。通过在室温条件下对比分析不同喷头位置、油盘位置、通风面积以及压强条件下窒息作用对灭火效果的影响,发现喷头位于密闭试验箱顶部时存在窒息作用,喷头在侧面时无窒息作用,但灭火速度和效率高,灭火所用时间很短。无论高压强还是低压强的情况,灭火主要靠冷却、火焰拉伸和吹熄作用。油盘越近,窒息作用越明显,灭火时间越短。油盘在最远端角落时窒息作用较小,灭火效果主要为冷却和火焰拉伸。通风面积由0.14 m^2增加到0.28 m^2时,灭火时间变长,窒息作用减缓,一氧化碳的产生量增加。

The flue gas analyzer and thermocouple temperature tester were used to study the influence of the asphyxiation of high pressure water mist system on the fire extinguishing effect of oil pan.The influence of asphyxiation on fire-fighting effect under different nozzle position,oil pan position,ventilation area and pressure conditions is analyzed by comparison analysis at room temperature.It was found that there is asphyxiation when the nozzle locates on the top of the closed test chamber.There is no suffocation effect when the nozzle is on the side,but the fire extinguishing speed and efficiency are very high,and the time for extinguishing the fire is very short.The fire extinguishing effect is mainly cooling,flame stretching and blowing out no matter the pressure is high or low.The closer the oil pan,the more obvious the effect of suffocation and the shorter the fire extinguishing time.When the oil pan is at the farthest corner,the suffocation effect is small,and the fire extinguishing effect is mainly cooling and flame stretching.As the ventilation area increased from 0.14 m^2 to 0.28 m^2,the fire extinguishing time became longer,the asphyxiation effect slowed down and the amount of generated carbon monoxide increased.