气力输送水泥粉体装置灭木垛火试验研究

Experimental study on fire extinguishing of pneumatic conveying cement powder device in wood crib fire

为了研究水泥粉体扑灭木垛火灾的可行性,通过自行设计的气力输送水泥粉体装置开展木垛火的灭火试验研究,利用温度采集装置和摄像机等仪器测试水泥粉体灭火前后木垛火的变化规律。结果表明,气力输送水泥粉体能有效抑制木垛表面明火,显著降低木垛火的燃烧温度,其中水泥粉体主要通过堆积覆盖作用进行灭火,而过大的木垛高度和孔隙率对水泥粉体灭火效果存在削弱作用。此外,水泥粉体灭火效果随水泥粉体的喷射角度和喷射高度变化而存在明显差异,其中喷射角度90°、喷射高度1.5 m时灭火效果最佳。

In order to study the feasibility of extinguishing wood crib fire by cement powder, the fire extinguishing experiment of wood crib fire was carried out through a self-designed pneumatic conveying device of cement powder. The temperature acquisition device and camera were used to test the change law of wood crib fire before and after extinguishing by cement powder. The results show that the pneumatic conveying cement powder fire-extinguishing device can suppress the fire effectively on the surface of wood stack and reduce the combustion temperature of wood stack fire significantly. Cement powder is used to extinguish fire by covering effect, and excessive wood stack height and porosity weaken the extinguishing effect of cement powder. The fire extinguishing effect of cement powder varies significantly with the spray angle and spray height of cement powder. When the spray angle is 90° and the spray height is 1.5 m, the fire extinguishing effect is the best.