Fire Extinguishing Mechanism Of Foam Fire Extinguishing

The fire extinguishing mechanism of foam fire extinguishing system is oxygen isolation asphyxiation, radiant heat isolation effect, and endothermic cooling effect. Foam fire extinguishing system is mainly used to extinguish non-water-soluble combustible liquid and general solid fires. The principle of fire extinguishing is that the aqueous solution of foam fire extinguishing agent is filled with a large amount of gas (CQ, air) through chemical and physical action, forming countless small bubbles, covering the surface of the combustible, isolating the combustion material from the air, blocking the heat radiation of the flame, thereby forming a fire extinguishing ability. At the same time, the foam precipitates liquid during the fire extinguishing process, which can cool the combustible. The water vapor generated by heating can also reduce the oxygen concentration near the combustion material, and can also play a better fire extinguishing effect.

There are many classifications of foam fire extinguishing systems: according to the installation and use mode, it can be divided into three types: fixed, semi-fixed and mobile; According to the foam injection method, it can be divided into three types: liquid spray, liquid injection and foam spray; According to the foam foaming ratio, it can be divided into three types: low magnification, medium magnification and high magnification.