Precisely what is Aerosol fire extinguishing
What on earth is aerosol fire extinguisher? Aerosol hearth extinguishing know-how is a fresh kind of fire extinguishing technological innovation designed on The idea of armed forces pyrotechnics.
The first generation of aerosol fire extinguishing technological innovation was born within our country, often called smoke fireplace extinguishing technological know-how, which started during the early nineteen sixties. It absolutely was concluded by scientific scientists within the Tianjin Hearth Investigate Institute of General public Stability, who independently designed an computerized smoke hearth extinguishing technique, which is mainly accustomed to extinguish fires in Class A, B, and C liquid storage tanks.
During the early 1980s, with the emergence of environmental defense troubles of “halon fireplace extinguishing agent”, locating choices to halon turned a crucial investigate subject.
At the conclusion of the 1980s, Russian scientists initially succeeded in researching aerosol fire extinguishing engineering which can extinguish fires in the submerged way, which opened up a fresh way for halon substitution analysis. Subsequently, aerosol hearth extinguishing technologies has captivated the attention on the Intercontinental Group, and international locations which include China, The usa, Australia, Malaysia as well as other countries have also begun exploration on new aerosol fire extinguishing technologies.
Generally speaking, aerosol can be a steady state technique formed because of the dispersion of fantastic stable or liquid particles in a gasoline. Professionally, it refers to your colloidal process that works by using gas (commonly air) since the dispersion medium and reliable or liquid particles because the dispersant.Frequent aerosols in mother nature—clouds, smoke, fog, and so forth.The size of the particles in aerosols is mostly in the buy of 10-5 to ten-1μm, which has gas fluidity and will diffuse close to hurdles.
The medicament during the aerosol fire suppression system system is strong, along with the ingredient emitted by the medicament from the oxidation-reduction reaction is aerosol. The very first era of aerosol fire extinguishing know-how-smoke fire extinguishing engineering.
K-variety aerosol fire extinguisher, also known as potassium salt hearth extinguishing know-how, is the next stage of the development of aerosol fire extinguishing technological know-how, which commenced in the previous Soviet Union inside the mid-sixties. Our country started out late On this regard, setting up from the early nineties.
In this sort of aerosol building agent, potassium nitrate is especially used as the key oxidant. Its sprays have significant fire extinguishing efficiency, but because they comprise a great deal of potassium ions, Straightforward to soak up dampness, forming a yellow and sticky potent alkaline conductive liquid film, this compound is very damaging to Digital equipment, so K-variety aerosol automatic fire extinguishing machine can not be Utilized in Digital products, precision devices and cultural relics Archive put. At the moment, the use available in the market is progressively decreasing.
The 3rd-technology aerosol (S type) is especially manufactured from strontium salt as the key oxidant. Contrary to the next-generation potassium salt (K-kind) aerosol, strontium ions tend not to take up moisture, tend not to kind a conductive Answer, and will not trigger damage to electrical equipment. In 2001, China Cell Communications Corporation picked the strontium salt aerosol (S-sort aerosol computerized hearth extinguishing product) made by the corporate immediately after demanding inspection and verification to guard its conversation foundation stations as well as other locations equipped with refined electronic tools.
At this time, strontium salt aerosol products are already used in 1000s of engineering tasks, as well as third-era aerosol is becoming A lot more accepted by buyers
Aerosol hearth extinguisher application assortment
a. Electrical hearth
Communication home, interaction base station, Digital Laptop or computer area, etcetera.;
Electrical fires in locations that contains precision instruments and equipment, like electricity distribution rooms, generator rooms, cable interlayers, cable wells, cable trenches, and so on.
b. Solid floor fire
Surface area hearth of combustible reliable resources in areas in which combustible reliable components are utilised or stored.
c. Liquid hearth
Liquid fires in destinations the place diesel oil is created, utilized or stored (besides -35 diesel), weighty oil, transformer oil, animal and vegetable oil and other flammable liquids of Class C; Before extinguishing a gasoline fire, the gas supply might be Reduce off.
Aerosol hearth suppression method software .
d. The S-style aerosol fireplace extinguishing unit can not be used to set out the next fires
①Substances that can be oxidized without air, which include nitrocellulose, gunpowder, and many others.; Energetic metals, which include potassium, sodium, magnesium, titanium, etcetera.; compounds which can decompose by by themselves, for example particular peroxides, hydrazine, and so forth. Metal hydrides, for example potassium fluoride, sodium hydride, and so on. Organic substances, for instance phosphorus. Strong oxidants, like nitrogen oxide, fluorine, etc.
② Deep fire of combustible stable resources.
③ Fire in crowded places, like theaters, auditoriums, etc.
④ Fireplace in sites with explosion hazard, such as workshops with explosive dust.
⑤ Ultra-clean up surroundings, including pharmaceutical workshops, chip processing sites, professional medical rooms, etcetera.
Aerosol fireplace extinguishing Doing work theory
The 4 factors of combustion: combustibles, oxidizer, temperature and uninhibited chain response. The fire extinguishing system of fire extinguishing gasoline will be to reduce 1 or various in the 4 things of combustion.
The reliable fire extinguishing agent in the S-variety aerosol fireplace extinguishing device is started off by electricity, and it undergoes redox response to type numerous agglomerated fireplace extinguishing aerosols, and its composition is mainly N2, a small number of CO2, and metallic salt strong particles.
Aerosol fire extinguishing system is as follows
Mechanism of endothermic cooling and fire extinguishing
Metallic salt particles soak up a large amount of warmth at large temperatures, and endure physical endothermic processes for example thermal melting and gasification. The flame temperature is decreased and after that radiated into the combustible combustion floor for gasification of combustible molecules and vaporized combustible molecules. The heat of pyrolysis of combustion molecules into free of charge radicals will decrease, as well as combustion response velocity is going to be suppressed to a specific extent.
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