What is Aerosol hearth extinguishing
What on earth is aerosol hearth extinguisher? Aerosol fire extinguishing engineering is a new kind of hearth extinguishing technological know-how made on the basis of armed service pyrotechnics.
The 1st generation of aerosol hearth extinguishing technological know-how was born in our country, also called smoke fireplace extinguishing technological innovation, which commenced during the early sixties. It had been completed by scientific scientists from the Tianjin Fire Investigation Institute of General public Safety, who independently developed an automatic smoke fire extinguishing procedure, which is principally utilized to extinguish fires in school A, B, and C liquid storage tanks.
From the early nineteen eighties, With all the emergence of environmental defense challenges of “halon hearth extinguishing agent”, locating choices to halon grew to become a vital investigate topic.
At the end of the 1980s, Russian experts very first succeeded in studying aerosol fire extinguishing technological know-how that can extinguish fires in a very submerged method, which opened up a completely new way for halon substitution investigate. Subsequently, aerosol fireplace extinguishing technological know-how has attracted the eye from the Global Group, and nations around the world like China, The usa, Australia, Malaysia and other international locations have also started analysis on new aerosol hearth extinguishing systems.
Generally speaking, aerosol is actually a steady state technique formed by the dispersion of great stable or liquid particles in a gas. Skillfully, it refers to a colloidal procedure that uses gasoline (commonly air) given that the dispersion medium and strong or liquid particles since the dispersant.Prevalent aerosols in character—clouds, smoke, fog, and many others.The dimensions in the particles in aerosols is generally from the get of ten-5 to ten-1μm, that has fuel fluidity and will diffuse all-around obstacles.
The medicament during the aerosol fire suppression procedure device is sound, and also the ingredient emitted via the medicament through the oxidation-reduction response is aerosol. The main generation of aerosol fire extinguishing know-how-smoke fireplace extinguishing technologies.
K-style aerosol fire extinguisher, also known as potassium salt hearth extinguishing know-how, is the second phase of the development of aerosol fire extinguishing technology, which started in the former Soviet Union inside the mid-1960s. Our state commenced late During this regard, starting off from the early nineteen nineties.
In this type of aerosol generating agent, potassium nitrate is mainly utilized as the primary oxidant. Its sprays have superior hearth extinguishing performance, but mainly because they consist of a large amount of potassium ions, Effortless to absorb humidity, forming a yellow and sticky powerful alkaline conductive liquid film, this material is quite damaging to electronic products, so K-kind aerosol automated fire extinguishing device can't be Employed in electronic tools, precision instruments and cultural relics Archive area. At present, the use on the market is little by little decreasing.
The third-technology aerosol (S kind) is especially manufactured from strontium salt as the key oxidant. Contrary to the next-generation potassium salt (K-style) aerosol, strontium ions tend not to absorb moisture, usually do not form a conductive Option, and is not going to bring about damage to electrical gear. In 2001, China Cellular Communications Company selected the strontium salt aerosol (S-style aerosol automated fireplace extinguishing device) made by the corporate soon after strict inspection and verification to protect its conversation foundation stations and also other sites equipped with innovative Digital tools.
At present, strontium salt aerosol products and solutions have already been utilized in 1000s of engineering jobs, plus the third-technology aerosol is now Increasingly more recognized by users
Aerosol fire extinguisher application vary
a. Electrical fireplace
Interaction area, communication base station, Digital Laptop place, etc.;
Electrical fires in places containing precision instruments and products, like electric power distribution rooms, generator rooms, cable interlayers, cable wells, cable trenches, etc.
b. Reliable area hearth
Floor fireplace of combustible strong supplies in locations the place combustible strong products are utilized or saved.
c. Liquid hearth
Liquid fires in destinations where diesel oil is created, employed or stored (except -35 diesel), large oil, transformer oil, animal and vegetable oil along with other flammable liquids of Category C; Prior to extinguishing a gas fireplace, the gasoline supply is usually Lower off.
Aerosol fire suppression process software .
d. The S-style aerosol fireplace extinguishing system cannot be utilized to put out the subsequent fires
①Substances which might be oxidized devoid of air, for instance nitrocellulose, gunpowder, and many others.; Energetic metals, including potassium, sodium, magnesium, titanium, and so forth.; compounds which can decompose by on their own, which include certain peroxides, hydrazine, and so on. Metal hydrides, for example potassium fluoride, sodium hydride, etc. Organic substances, like phosphorus. Strong oxidants, including nitrogen oxide, fluorine, and so forth.
② Deep hearth of combustible stable resources.
③ Fire in crowded destinations, including theaters, auditoriums, etc.
④ Fireplace in places with explosion hazard, for example workshops with explosive dust.
⑤ Ultra-clean natural environment, for instance pharmaceutical workshops, chip processing locations, healthcare rooms, and many others.
Aerosol fireplace extinguishing Performing theory
The four factors of combustion: combustibles, oxidizer, temperature and uninhibited chain reaction. The hearth extinguishing mechanism of hearth extinguishing gas is always to reduce one or numerous of your 4 features of combustion.
The stable hearth extinguishing agent inside the S-kind aerosol fireplace extinguishing machine is started by electricity, and it undergoes redox response to kind numerous agglomerated fireplace extinguishing aerosols, and its composition is mainly N2, a little amount of CO2, and steel salt sound particles.
Aerosol fireplace extinguishing system is as follows
Mechanism of endothermic cooling and hearth extinguishing
Steel salt particles soak up a great deal of warmth at high temperatures, and endure physical endothermic procedures which include thermal melting and gasification. The flame temperature is decreased and after that radiated to the combustible combustion floor for gasification of combustible molecules and vaporized combustible molecules. The heat of pyrolysis of combustion molecules into totally free radicals will decrease, as well as combustion response pace might be suppressed to a particular extent.
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