【 Weak current College 】 four types of fire extinguishers and the use method---Power By 【 China power house network 】

1. carbon dioxide extinguisher principle and what is the use?

Carbon dioxide fire extinguishing agent is a kind one hundred years of history, fire extinguishing agent, cheap, easy access, preparation, mainly rely on suffocation and part of the cooling effect of fire. Carbon dioxide has higher density, about air 1.5 times. Under normal pressure, liquid carbon dioxide will immediately vaporization, General 1 kg of liquid carbon dioxide can produce about 0.5 cubic meters of gas. Thus, fire fighting, the CO2 can exclude air and surrounded by burning objects on the surface or in a confined space, reduce fuel around or protection space of the oxygen concentration, the role fire extinguishing suffocation. In addition, CO2 from the storage container, it will emit from the rapid vaporization of the liquid into gas and attract some heat from the surrounding, a cooling effect.

Carbon dioxide fire extinguisher is mainly used for fighting valuable equipment, archival materials, instrumentation, 600 volts the following electrical equipment and the beginning of the oil fires. When used, you should first place the fire extinguisher referred to fire extinguishers, put down, pull out the insurance, a hand hold megaphone root handle with one hand and hold the on-off valve for pressure. Do not spray hose extinguisher should push on megaphone to 70-90 degrees. When used, you cannot directly use hand seize megaphone wall or metal connection pipe to prevent hands were frostbitten. When using carbon dioxide fire extinguishers, outdoor use, you should choose the poop Jet; indoor narrow space use, fire after the operator should leave promptly to prevent suffocation.

Second, dry powder fire extinguishers principle and what is the use?

Dry powder extinguisher internal filling is powder extinguishing agent. Fire extinguishing agent is used for drying and easy flow of fine powder, consisting of a fire and a small amount of inorganic additives by drying, crushing, a mixture composed of fine powder. It is a widely used in fire-extinguishing agents, and is mainly used in fire extinguishers. In addition to fight metal chemical fire extinguishing agent of dedicated dry powder, powder extinguishing agent will generally be divided into BC powder extinguishing agent and ABC powder. Such as sodium bicarbonate powder, modified sodium salt powder, potassium powder, dry ammonium dihydrogen phosphate, phosphoric acid, phosphoric acid ammonium dihydrogen phosphate powder dry and amino powder extinguishing agent. Extinguishing gas under pressure, mainly through the action of powder spray and flame exposure, mixing occurs when the physical and chemical effects of fire: a by dry powder of inorganic salts of volatile decomposition, and the combustion of fuel by radical or activity groups occurring chemical restraint and catalytic role, so that combustion of chain reaction interrupt and fire-fighting; second, by dry powder on the surface of the fuel, chemical reaction, and in the heat of formation of a layer of glass, thus covering layer isolates the oxygen, and smothering. In addition, there are some diluted oxygen and cooling effect.

Dry powder fire extinguisher, the most commonly used open method for the pressure to act, the fire extinguisher referred to the appropriate distance from the fire source, the first upside down several times, so that the container of powder is loose, and then let the nozzles on the combustion, the fiercest pluck insurance pin, screw-down pressure, fire extinguishing agent is spraying out the fire. Also available rotation method. Open the dry powder extinguishing rods, left hand holding the Ministry, which will align the flame nozzle roots, right hand pull the insurance card, clockwise to turn knob, open storage cylinder, delay time 1-4 seconds, dry powder fire extinguishing is emitted.

3、water fire extinguishers principle and what is the use?

The extinguishing agent in the extinguisher as clear water. Water at room temperature with low viscosity, high thermal stability, high density and high surface tension, is an old and use a wide range of natural fire extinguishing agent, easy access and storage. It mainly depends on cooling and suffocation role for fire suppression. Because each kg of water from normal temperature heating to the boiling point and totally evaporate evaporation, can absorb 2593.4KJ heat. Therefore, it uses its own absorption of sensible heat and latent heat capacity to play the role of cooling fire, other fire extinguishing agent is unequaled. In addition, the water is vaporized steam for the formation of inert gases, and the volume will be expansive 1700 times. In the fire, the water vapor of steam will occupy the space of the combustion zone, diluting combustion of oxygen content around, impeding fresh air into the combustion zone, the combustion of oxygen concentration in the region greatly reduced, so as to achieve the purpose of the smothering. When water is spray mist, water droplets and the formation of the droplet surface area will greatly increase and enhance the water and the role of heat between the fire and hence its cooling and suffocation. In addition, on some easily soluble in water of combustible, flammable liquids can also play the role of dilution; use a strong jet of water mist can produce combustible, flammable liquid, emulsion so that rapid cooling of the surface of the liquid, flammable vapor generation slowdowns to fire-fighting purposes.

When you use extinguisher may use the slap method of the extinguisher upright stability, protection CAP, hand slap open bars at the top of the convex head, flow from the nozzle.

IV. scope of application of the simple-type fire extinguishers and what is the use?

Summary of fire extinguisher is in recent years the development of portable fire extinguishers. It is characterized by the amount of extinguishing agent for filling in the 500 grams, the pressure in the 0.8 MPA, and is a one-time use, not refillable small fire extinguishers. By filling-in of extinguishing agent type, simple type fire extinguishers, fire extinguisher 1211, also known as aerosol-halon fire extinguishers; summary of dry powder fire extinguishers, also called portable fire extinguishers; there are also simple air foam fire extinguishers, also called portable air foam fire extinguishers. Summary of fire extinguisher suitable for family use, simple-1211 fire extinguishers and summary of dry powder fire extinguishers can fight and LPG cylinder valve on the stove or gas range wait at the beginning of fire and extinguishing fires and wastebasket hotpot, solid fuel burning fire. Summary of air bubbles for cream, kerosene heaters, oil lamps and candles due to fire, in the beginning of the solid fuel burning fire suppression.

Use the simple-type fire extinguishers, fire extinguisher simplified upper hand, press down on the openRestart button, press down to Jet. In off the stove or LPG cylinder valve, gas combustion in the beginning of the fire, as long as the alignment of the burning flame spray, fire off after upcoming event comes alive again; if off cream fire response flame spray around the roots and rock, up to fight the fire. Fire extinguishing gas should be turned off immediately after the switch. Or will be removed from the furnace, Pan and prevent recurrence. Simple air bubbles cream fire, of coping with pot wall foam, cannot directly impact oil surface to prevent the oil out of cream, the expansion of the fire.