Abstract: 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.

Key words: pneumatic transport; cement powder; fire extinguishing; wood crib fire