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What is Aerosol hearth extinguishing

What exactly is aerosol fireplace extinguisher? Aerosol hearth extinguishing engineering is a whole new style of fireplace extinguishing technological know-how developed on the basis of navy pyrotechnics.

The very first generation of aerosol fire extinguishing technological know-how was born inside our place, generally known as smoke fire extinguishing engineering, which commenced within the early sixties. It absolutely was done by scientific scientists in the Tianjin Fireplace Study Institute of Public Safety, who independently developed an automated smoke fireplace extinguishing procedure, which is especially utilized to extinguish fires in school A, B, and C liquid storage tanks.

Inside the early eighties, Using the emergence of environmental protection complications of “halon fire extinguishing agent”, acquiring possibilities to halon grew to become an essential investigate subject.

At the end of the 1980s, Russian researchers very first succeeded in looking into aerosol fireplace extinguishing technologies which can extinguish fires inside a submerged fashion, which opened up a different way for halon substitution research. Subsequently, aerosol fire extinguishing technologies has attracted the eye in the Worldwide Local community, and nations like China, The us, Australia, Malaysia together with other nations around the world have also started research on new aerosol hearth extinguishing technologies.

Generally speaking, aerosol is often a stable condition system fashioned via the dispersion of fantastic strong or liquid particles in the gasoline. Professionally, it refers to your colloidal method that uses gas (commonly air) given that the dispersion medium and solid or liquid particles as being the dispersant.Prevalent aerosols in character—clouds, smoke, fog, and so forth.The size in the particles in aerosols is mostly during the order of ten-five to 10-1μm, which has gas fluidity and may diffuse about hurdles.

The medicament in the aerosol fire suppression technique gadget is good, as well as the element emitted because of the medicament through the oxidation-reduction reaction is aerosol. The main generation of aerosol fireplace extinguishing technological know-how-smoke hearth extinguishing technology.

K-variety aerosol hearth extinguisher, also known as potassium salt fireplace extinguishing technologies, is the second stage of the event of aerosol hearth extinguishing engineering, which commenced in the previous Soviet Union from the mid-sixties. Our place started off late With this regard, starting off in the early nineties.

In such a aerosol building agent, potassium nitrate is principally used as the primary oxidant. Its sprays have substantial hearth extinguishing performance, but since they contain a great deal of potassium ions, Uncomplicated to soak up moisture, forming a yellow and sticky robust alkaline conductive liquid film, this compound is very detrimental to Digital machines, so K-type aerosol computerized hearth extinguishing gadget can not be Employed in electronic products, precision devices and cultural relics Archive place. At this time, the use on the market is slowly reducing.

The 3rd-generation aerosol (S kind) is mainly made of strontium salt as the key oxidant. Contrary to the second-technology potassium salt (K-form) aerosol, strontium ions don’t soak up humidity, usually do not sort a conductive Alternative, and will likely not bring about harm to electrical machines. In 2001, China Mobile Communications Corporation selected the strontium salt aerosol (S-sort aerosol automated hearth extinguishing device) produced by the organization right after strict inspection and verification to shield its communication foundation stations and also other spots equipped with subtle Digital devices.

At the moment, strontium salt aerosol items have been utilized in A large number of engineering initiatives, plus the 3rd-technology aerosol is now An increasing number of acknowledged by end users

Aerosol hearth extinguisher application array

a. Electrical fire

Interaction room, conversation base station, electronic Laptop or computer place, and many others.;

Electrical fires in locations containing precision devices and products, for instance energy distribution rooms, generator rooms, cable interlayers, cable wells, cable trenches, and many others.

b. Sound area fire

Surface area fire of combustible good products in locations the place combustible good products are used or saved.

c. Liquid fireplace

Liquid fires in spots in which diesel oil is generated, made use of or saved (except -35 diesel), significant oil, transformer oil, animal and vegetable oil and various flammable liquids of Classification C; Before extinguishing a gas fireplace, the gasoline supply is often Slash off.

Aerosol fire suppression technique application .

d. The S-variety aerosol hearth extinguishing machine can’t be accustomed to set out the following fires

①Substances which can be oxidized without air, for instance nitrocellulose, gunpowder, etc.; Energetic metals, for instance potassium, sodium, magnesium, titanium, and so forth.; compounds which can decompose by by themselves, for example selected peroxides, hydrazine, etcetera. Metallic hydrides, which include potassium fluoride, sodium hydride, and so forth. Organic substances, like phosphorus. Robust oxidants, including nitrogen oxide, fluorine, and so on.

② Deep hearth of combustible good components.

③ Fire in crowded areas, for instance theaters, auditoriums, and many others.

④ Fireplace in locations with explosion hazard, for instance workshops with explosive dust.

⑤ Extremely-clean atmosphere, like pharmaceutical workshops, chip processing locations, health care rooms, etcetera.

Aerosol fire extinguishing Doing work theory

The 4 aspects of combustion: combustibles, oxidizer, temperature and uninhibited chain response. The fireplace extinguishing system of hearth extinguishing gas is to reduce a person or various from the four factors of combustion.

The good fireplace extinguishing agent while in the S-style aerosol fireplace extinguishing machine is started by electricity, and it undergoes redox response to type a large number of agglomerated fireplace extinguishing aerosols, and its composition is especially N2, a little level of CO2, and metallic salt strong particles.

Aerosol fireplace extinguishing system is as follows

Mechanism of endothermic cooling and fireplace extinguishing

Metallic salt particles take up a large amount of warmth at superior temperatures, and bear Bodily endothermic procedures for instance thermal melting and gasification. The flame temperature is decreased and afterwards radiated on the combustible combustion floor for gasification of combustible molecules and vaporized combustible molecules. The warmth of pyrolysis of combustion molecules into cost-free radicals will lower, and also the combustion reaction velocity is going to be suppressed to a certain extent.

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