Abstract: Abstract: This paper validates the practical effect of foam stacking fire extinguishing method in large?scale methanol pool fires through large?scale pool fire extinguishing experiments. The main considerations are the influence of wind direction and foam mixture supply intensity on foam spreading effect and fire extinguishing rate. Meanwhile, the foam stacking fire extinguishing mechanism was analyzed, with the whole process of the experiment recorded by temperature measurement and camera equipment. The research results show that AFFF/AR stacked fire extinguishing is suitable for extinguishing methanol pool fires; the larger the supply intensity of AFFF/AR mixture and the stronger the downwind force, the faster the foam spreading and the higher the fire extinguishing rate. During the fire extinguishing process, appropriately reducing the supply intensity of AFFF/AR mixture can enhance the fire extinguishing efficiency per unit of foam concentrate and reduce environmental pollution.

Key words: methanol pool fires, foam overlay, foam flow, wind direction, environmental protection