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Suolong Fire Digital Science Museum-"Foam Fire Extinguishing Technology" (III)
Release time:
2021-08-05
<泡沫灭火剂分类>According to the foaming mechanism, the foam extinguishing agent is divided into chemical foam extinguishing agent and air foam extinguishing agent according to the foaming mechanism. Chemical foam fire extinguishing agent is the use of chemical reaction method to produce foam, see the following chemical reaction equation: air foam fire extinguishing agent is the use of foam generation device to inhale or blow into the air and generate foam. Air foam extinguishing agent is generally liquid, so it is usually called foam liquid. At present, there is also the use of air compressor to fill air into the foam mixture pipe foaming, called compressed air foam. China also for low boiling point flammable liquids, developed to the foam mixture pressure pipeline injection</泡沫灭火剂分类>
Classification by foaming mechanism
Foam extinguishing agent is divided into chemical foam extinguishing agent and air foam extinguishing agent according to the foaming mechanism.
Chemical foam fire extinguishing agent is the use of chemical reaction method to produce foam, see the following chemical reaction equation:
The air foam extinguishing agent generates foam by sucking or blowing air into a foam generating device. Air foam extinguishing agent is generally liquid, so it is usually called foam liquid. At present, there is also the use of air compressor to fill air into the foam mixture pipe foaming, called compressed air foam. China has also developed a fire extinguishing system that injects heptafluoropropane into the pressure pipeline of foam mixture and then releases it into the protected storage tank for low boiling point flammable liquid, which is called heptafluoropropane foam system.
Air foam fire extinguishing agent is classified according to foaming multiple
According to the classification of foaming multiples, foam extinguishing agents with foaming multiples below 20 are called low multiples foam extinguishing agents, foam multiples of 20-200 are called medium multiples foam extinguishing agents, and foam multiples of 200-1000 are called high multiples foam extinguishing agents.
High-multiplier foam extinguishing agent is generally shared with medium-multiplier foam extinguishing agent, which is a synthetic foam extinguishing agent. According to the applicable water source, it is divided into seawater-resistant type and seawater-resistant type; according to the applicable air condition of foaming, it is divided into smoke-resistant type and smoke-resistant type. At present, there is no high-performance foam fire extinguishing agent with both temperature and smoke resistance and seawater resistance.
Low multiple foam fire extinguishing agents are divided into ordinary foam fire extinguishing agents and anti-dissolving foam fire extinguishing agents according to their applicable combustion type. Common foam fire extinguishing agent is mainly suitable for fighting water-insoluble Class A, B and C liquid fires. It mainly includes protein foam fire extinguishing agent (P), fluorine protein foam fire extinguishing agent (FP), aqueous film forming foam fire extinguishing agent (AFFF), film forming fluorine protein foam fire extinguishing agent (FFFP), etc. In addition to the function of common foam fire extinguishing agent, it is mainly used for fighting water-soluble A, B and C liquid fires such as alcohol, ester, aldehyde and ketone. It mainly includes anti-soluble fluorine protein foam extinguishing agent (FP/AR), synthetic anti-soluble foam extinguishing agent (S/AR), anti-soluble water film foam extinguishing agent (AFFF/AR), anti-soluble film fluorine protein foam extinguishing agent (FFFP/AR), etc. Aqueous film-forming foam fire extinguishing agents are divided into seawater-resistant and seawater-resistant types according to their applicable water sources.
Classification by mixing ratio of foam extinguishing agent
The solution after the foam fire extinguishing agent is mixed with water is called foam mixture, and the volume percentage of the foam fire extinguishing agent in the foam mixture is called mixing ratio. At present, the common mixing ratio types of ordinary aqueous film foam extinguishing agent are 6%, 3% and 1%, and the common mixing ratio types of protein and anti-soluble foam extinguishing agent are 6% and 3%.
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