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Huaqiang Security Network News ]
China Security Network Xiaobian This article mainly introduces the principle of foam fire extinguisher reaction.
Foam fire extinguisher reaction principle
Principle equation: Al2(SO4)3+6NaHCO3==3Na2SO4+2Al(OH)3↓+6CO2↑
According to the nature of carbon dioxide neither burning nor burning, various carbon dioxide fire extinguishers have been developed, including foam fire extinguishers, dry powder fire extinguishers and liquid carbon dioxide fire extinguishers. The following is a brief introduction to the principle and use of foam fire extinguishers:
There are two containers in the foam fire extinguisher, which are respectively filled with two kinds of liquids, which are aluminum sulfate and sodium bicarbonate solution, which are respectively placed in the inner tube and the outer tube, the inner tube is Al2(SO4)3, and the outer tube is NaHCO3. The two solutions are not in contact with each other and no chemical reaction takes place. (Do not touch the foam fire extinguisher in peacetime.) When a foam fire extinguisher is needed, put the fire extinguisher upside down and mix the two solutions together to produce a large amount of carbon dioxide gas:
In addition to the two reactants, some foaming agents were added to the fire extinguisher. The foaming agent enables the foam fire extinguisher to eject a large amount of carbon dioxide and foam when the switch is opened, can adhere to the burning articles, isolate the burning material from the air, and lower the temperature to achieve the purpose of extinguishing the fire. Since the foam fired from the foam fire extinguisher contains a lot of water, it is not as good as a carbon dioxide liquid fire extinguisher, which does not pollute the material after extinguishing the fire, leaving no trace.
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