LNG槽车车载水喷雾装置抑制燃烧机理研究

Mechanism research on fire inhibition using water spraying device installed on LNG tank vehicles

以LNG槽车操作箱为研究对象,通过建立受限空间内介质泄漏后水雾抑制燃烧非稳态数值模型,研究水雾喷头高度、双喷头水平间距、雾化角度对抑制燃烧效果的影响规律和作用机理。结果表明:操作箱内相对湿度随着喷头高度、双喷头水平间距、雾化角度的增加先升高后降低。喷头高度越高,蒸发速率和平均湿度初始上升速度越快,达到的蒸发速率峰值越高,达到峰值后下降速度也越快。合理设置水喷雾装置能够显著加速流场流通速率,均匀流场分布,防止泄漏气体积聚,增加平均湿度,有效预防火灾爆炸事故的发生。

Taking LNG tank vehicle operation box as research object,by buliding unsteady numerical model of watermist inhibiting combustion after leakage in confined space,effects and mechanisms of different nozzle heights,intervals and spraying angle on fire inhibition were studied.The results showed that with the increase of nozzle height,intervals and spraying angle,the relative humidity in the control cabinet first increases and then decreases.The higher the nozzle height,the faster the initial rise rate of evaporation rate and average humidity,the higher the peak value of evaporation rate,and faster the decline rate after reaching the peak value.Reasonable arrangement of water spraying device can significantly accelerate the flow rate of the flow field,uniform flow field distribution,prevent leakage gas accumulation,increase average humidity,and prevent fire and explosion.