The fire extinguishing mechanism of the foam fire extinguishing system is the oxygen suffocation effect, the radiant heat barrier effect, and the endothermic cooling effect. Foam fire extinguishing systems (such as using F-500 Foam Fire Extinguishing Agent) are mainly used to extinguish water-insoluble flammable liquids and general solid fires. The principle of fire extinguishing is that the aqueous solution of the foam fire extinguishing agent forms a large number of small bubbles by filling a large amount of gas (CQ, air) through chemical and physical action, covering the surface of the burning object, so that the burning object is insulated from the air, thereby blocking the heat radiation of the flame, thereby Form fire extinguishing capacity. At the same time, the foam precipitates liquid during the fire extinguishing process, and the combustion product can be cooled. The water vapor generated by the heat can also reduce the oxygen concentration near the combustion product, and can also achieve a better fire extinguishing effect.
There are many types of foam fire extinguishing systems: they can be divided into fixed type, semi-fixed type and mobile type according to the way of installation. According to the foam spray method, they can be divided into three types: liquid spray, liquid spray and foam spray; The bubble multiple can be divided into three types: low, medium and high.