Foam fire extinguishing agent is an effective fire extinguishing agent that can put out combustible and combustible liquids. It mainly forms a condensed foam floating layer on the surface of the liquid, which acts as suffocation and cooling. Foam fire extinguishing agents are divided into chemical foam, air foam, fluoroprotein foam, aqueous film-forming foam and alcohol-resistant foam. The scope of application is very wide.
Air foam is produced by mechanically mixing and stirring the aqueous solution of air foam fire extinguishing agent and air in the foam generator. Therefore, air foam is also called mechanical air foam. The gas contained in the foam is generally air.
Air foam fire extinguishing agents can be divided into three categories: low expansion foam, medium expansion foam and high expansion foam according to the foam expansion ratio.
The foaming ratio of low-expansion foam fire extinguishing agents is generally below 20 times; according to the type and purpose of the foaming agent, low-expansion foam fire extinguishing agents can be divided into ordinary protein foam, fluoroprotein foam, aqueous film-forming foam, synthetic foam and anti-foam Five types of soluble foam.
Medium and high expansion foam fire extinguishing agents belong to the type of synthetic foam. According to the mechanism of foam generation, foam fire extinguishing agents can be divided into chemical foam fire extinguishing agents and air foam fire extinguishing agents. Chemical foam is produced by a chemical reaction between the aqueous solutions of two medicaments, and the gas contained in the foam is carbon dioxide.
The foaming multiple of medium multiple foam fire extinguishing agent is generally 20~200 times;
The foaming ratio of high-expansion foam fire extinguishing agent is 201~1000 times.
Therefore, foam fire extinguishing agents are suitable for extinguishing oil-like flammable liquids and flammable solid material fires. They cannot be used for extinguishing light metal fires, fires that burn or explode substances in water, and fires on live equipment. This is worthy of everyone's attention.