长内走道排烟优化控制方式的适用条件研究

Suitable condition about the optimization control way for the smoke exhaust of the long internal corridor

分析了长内走道自然排烟效果的影响因素。依照不同风向、风速及排烟口面积,设置五个火灾场景。火源位置固定,火源功率1.5 MW。结果:①600 s时,2 m高处烟气温度均在60℃以下。②排烟口总面积在6 m2以下的火灾场景,2 m以下的能见度不足10 m;排烟口总面积为12 m2的火灾场景,能见度均达12 m以上。结论:排烟口达到一定面积才能起到良好的排烟效果,外界风向能影响长内走道的烟气排放,常规风速作用下即能达到安全疏散标准。

Effective factors of natural smoke exhaust for the long internal corridor are analyzed.According to the different wind direction,wind velocity and smoke vent area,five fire scenarios are built.The fire position is fixed.Fire power is 1.5 MW.Results show that： ①At 600 s on high of 2 m,the temperature of smoke is less than 60 ℃.②When the total area of smoke vent is less than 6 m2,the visibility on high of 2 m is less than 10 m.When the total area is up to 12 m2,the visibility is larger than 12 m.Conclusion： The area of smoke vent should be up to certain value, so that it has good smoke exhaust effect. The external wind direction may influence the exhaust of smoke in the long internal corridor. By the action of common wind velocity, the long internal corridor may be up to the standard of the safety evacuation.