1. Fire extinguishing principle: The dry powder fire extinguisher uses compressed carbon dioxide gas or nitrogen as power to blow dry powder to extinguish the fire.
The dry powder used as a fire extinguishing agent in a dry powder fire extinguisher is a dry and easy-flowing fine solid powder. These powders are made of inorganic salts (such as sodium hydrogencarbonate, modified sodium salt, potassium salt, ammonium dihydrogen phosphate). , diammonium hydrogen phosphate, etc. as a base material, and a small amount of additives such as a moisture-proofing agent, a flow promoter, and an agglomerating agent are added, dried, pulverized, and mixed.
The physical and chemical action that occurs when the mist sprayed by the pressurized gas contacts and mixes with the flame causes fire extinguishing. The first is the volatile decomposition of inorganic salts in the dry powder, which is chemically inhibited and side-catalyzed by the free radicals or reactive groups generated by the fuel during the combustion process, so that the combustion chain reaction is interrupted and extinguished; second, the powder of the dry powder falls on Outside the surface of the combustibles, a chemical reaction takes place and a layer of glassy coating is formed under the action of high temperature to isolate oxygen and thereby suffocate the fire. In addition, there is partial dilution of oxygen and cooling.
2. Scope of application: Dry powder fire extinguishers are mainly used to extinguish flammable liquids such as petroleum and organic solvents, and the initial fire of flammable gases, and can also be used to extinguish general fires.
3. Type: Dry powder fire extinguishers are divided into three types: portable, piggyback and stroller.
4. Opening method: The most common opening method for dry powder fire extinguisher is pressure pressing method. After the fire extinguisher is mentioned at a proper distance from the fire source, first turn upside down several times to loosen the dry powder in the cylinder, and then let the nozzle align with the most violent burning. , remove the insurance pin, press down the pressure, the fire extinguishing agent will be sprayed out to extinguish the fire.
In addition, a rotation method can also be used. When opening the dry powder fire extinguishing stick, hold the middle part with your left hand, point the nozzle at the root of the flame, pull the insurance card with your right hand, turn the knob open clockwise, open the gas cylinder, and lag for 1-4 seconds, the dry powder will be fired. .
5. Note: The lithium-ion battery warehouse is on fire and the dry powder fire extinguisher cannot be effectively extinguished. When the fire is high, it is more difficult to extinguish the fire.
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