Foam fire extinguishing agent is an effective fire extinguishing agent for extinguishing flammable and combustible liquids. It mainly forms a condensed foam floating layer on the surface of the liquid to suffocate and cool. Foam fire extinguishing agents are divided into chemical foam, air foam, fluoroprotein foam, aqueous film-forming foam and alcohol-resistant foam. Foam fire extinguishing agent is a medicament that is miscible with water and produces foam through mechanical action or chemical reaction to extinguish fire.
Foam fire extinguishing agents are generally composed of foaming agents, foam stabilizers, viscosity reducers, antifreeze agents, cosolvents, preservatives and water. Mainly used for fighting non-water-soluble flammable liquid and general solid fires. Special foam extinguishing agent can also extinguish water-soluble flammable liquid fires.
Foam extinguishing agents are divided into chemical foam extinguishing agents and air foam extinguishing agents. The chemical foam extinguishing agent is sodium bicarbonate aqueous solution and aluminum sulfate aqueous solution; the air foam extinguishing agent is protein, fluorine-containing protein and other foaming agents. Carbon dioxide fire extinguishing agent is compressed carbon dioxide gas.
The main component Al2(SO4)3NaHCO3 reaction principle Al2(SO4)3+6nahco3==3nahso4+2al(oh)3↓+6CO2↓.
After a small amount of stabilizer (iron oxide) is mixed, the foam produced by the interaction is mainly acid salt (aluminum sulfate), basic salt (sodium bicarbonate) and a small amount of foaming agent (plant hydrolyzed protein or licorice powder), often used as a chemical Foam fire extinguishing agent. They are sticky and can cover the surface of the fire and isolate the air. At the same time, C2 is an inert gas. The foam density is low, and its reaction formula is: 6naHCO3+Al2(SO4)3→2Al(OH)3+3nA2O4+6CO2 chemical foam fire extinguishing agent produces a large amount of carbon gas after the action, which reacts with the foaming agent to produce multiple bubbles, which does not burn .