What is the reaction principle of foam fire extinguishers in fire suppression?

[LydiaAnn]

Foam fire extinguishers primarily work through cooling and suffocation effects. Below is a detailed introduction to foam fire extinguishers: Fire suppression by foam fire extinguishers: A continuous foam layer is formed on the surface of the burning material. This layer cools the burning surface through the foam itself and the released mixed liquid, while also isolating the burning material from oxygen via the covering effect of the foam layer, thereby achieving fire suppression. Foam fire extinguishers are categorized into portable foam fire extinguishers, trolley-type foam fire extinguishers, and air foam fire extinguishers. Storage methods for foam fire extinguishers: Foam fire extinguishers should be stored in dry, cool, well-ventilated, and easily accessible locations. They should not be placed near high-temperature areas or places exposed to direct sunlight to prevent the decomposition of carbonates, which would render them ineffective. In winter, anti-freezing measures should be taken to prevent freezing. Additionally, dust should be regularly wiped off, and the nozzle should be kept clear to ensure smooth operation.