Cable channel fire is a major factor impacting the safe operation and maintenance of power, data cables.
The following are the characteristics of a cable fire accident:
All types of cables have caught fire and burned, including oil-paper insulated cable, high voltage oil-filled cable, rubber insulated cable, and plastic insulated cable (including cross-linked poly-ethylene insulated cable and PVC insulated cable). Even if the oil-paper insulated cable is used in an open space layout with less than three layers of cable, it can often extinguish in a fire.
Many fire disasters have caused the entire factory, to halt production due to critical loop cable fires, which have resulted in the loss of backup power supplies or important public power supplies.
When a cable catches fire, it will spread to nearby cables, intensifying the burning and speeding up the process along the cable line.
Extinguishing technology for cable channels
1. Gas extinguishing technique:
A conventional fire-extinguishing method is the use of gas. Since carbon dioxide in the air signals poor speed and low fire-extinguishing efficacy, other fire-extinguishing methods have gradually replaced it in recent years.
Water mist is made up of microscopic water particles sprayed at high pressure with a particular nozzle.
Fire extinguishing mechanism -
Because water mist droplets have a small diameter, their surface area increases considerably when compared to the same volume of water, improving heat exchange efficiency and providing a good cooling effect. The fine water mist quickly vaporizes after absorbing heat, causing the volume to expand fast, frequently by more than 1700 times, lowering the oxygen concentration in the air, slowing the oxidation reaction in burning, and causing suffocation.
Furthermore, fine water mist has extremely high effectiveness in inhibiting heat radiation transfer and may effectively block powerful heat radiation.
3. Superfine dry powder extinguishing technology:
Active fire-extinguishing components, hydrophobic components, and inert fillers make up the majority of ultrafine dry powder fire extinguishing agents. This type of common dry powder extinguishing agent is frequently utilized both domestically and internationally.
Fire extinguishing mechanism -
The particle size of a typical dry powder extinguishing agent is between 10 and 75 m, resulting in poor dispersion and a tiny specific surface area.
As a result, the total specific surface area of quantitative dry powder is small, the mass of a single particle is large, the sedimentation rate is fast, and the decomposition rate is slow when heated, leading to a reduced ability to capture free radicals and thus limiting the scope of dry powder extinguishing agents.
Dry powder extinguishing agent particle size is directly connected to its extinguishing efficiency. The larger the better. The extinguishing component's critical particle size is, the more effective the extinguishing effect. By making ultra-fine powder, you may improve the efficiency of dry powder which can be spread and suspended in a uniform manner igniting space, ensuring extinguishing activity lowering the quantity of component particles per unit of space extinguishing agent.
4. Aerosol fire extinguishing technology:
Aerosol firefighting technology is a relatively new firefighting technique. Based on military fireworks, technology was developed.
Aerosol is a small suspension of solid or liquid particles distributed in a gas created by a stable state system; professionals refer to the gas (typically air) as a dispersion medium and the solid or liquid particles as colloidal dispersion.
K type aerosol fire extinguishing technique is also known as Potash class fire extinguishing technology. The potassium is mostly used by the type of aerosols in the agent.
Because it contains a lot of potassium, it is easy to absorb moisture and form a kind of yellow sticky strongly basic conductive liquid film, this kind of material for electronic equipment has a lot of damage, so K type automatic aerosol fire extinguishing device cannot be used in electronic equipment.
The S-type third-generation aerosol is mostly used, consisting primarily of strontium salt as the primary oxidant. The ion strontium does not absorb moisture. It does not form a conductive solution, and it does not cause any harm to Electrical equipment.
Fire extinguishing mechanism-
a) Chemical inhibition in the gas phase: under the influence of heat, decomposed vaporised metal ions or cations losing electrons in the fire-extinguishing aerosol can form an affinity reaction with the active groups in combustion, consuming a large number of active groups and lowering combustion-free radicals.
b) Chemical inhibition in the solid phase: the particles in the fire-extinguishing aerosol are very small, with a large surface area and surface energy, allowing them to absorb active groups in combustion and produce chemical action to consume a large number of active groups and reduce combustion-free radicals.
c) Lowering oxygen concentration: N2 and CO2 in fire-extinguishing aerosols can lower oxygen concentration in combustion, but at a slow rate, and the fire-extinguishing effect is significantly smaller than heat absorption cooling and chemical inhibition.
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