2. Asphyxiation method: prevent air from flowing into the combustion zone or dilute the air with non-combustible substances, so that the combustion products can not get enough oxygen and go out. In practical use, such as using asbestos blanket, wet sack, wet quilt, wet towel quilt, yellow sand, foam and other incombustible or nonflammable substances to cover the combustible materials; Equipment for fil containers with inert gas such as steam or carbon dioxide; It is best to close the doors, windows and holes of burning buildings and equipment.
3. Cooling method: Spray the fire extinguishing agent directly on the combustible to reduce the temperature of the combustible. When the temperature of combustion products drops below its ignition point, combustion stops. Or spray the fire extinguishing agent on the combustible near the fire source to reduce its temperature and prevent it from catching fire due to the influence of radiant heat. Cooling method is the main method of fire fighting, which mainly uses water and carbon dioxide to cool down.
4. Suppression method: This method uses a chemical fire extinguishing agent containing fluorine and bromine (12 1 1) to spray flame, so that the fire extinguishing agent participates in the combustion reaction, and the reaction of free radical chain (commonly known as "combustion chain") is interrupted to achieve the purpose of fire extinguishing.
Mislit water makes the fire stronger.
As the saying goes, "Fire and water are incompatible." Once the oil pan catches fire, the first reaction of many citizens is to put out the fire with water. So, what if you water the burning oil pan? When the fireman poured a bowl of water into the burning oil pan, the flame exploded quickly, and the flame produced was more than two meters high. The reporter could feel a heat wave coming from four meters away, and the fire burned until the oil ran out.
Therefore, when the oil pan is on fire, don't use water to put out the fire, because oil is lighter than water, floating on the water can't produce the effect of isolating air, and splashing water will lead to oil splashing, which will easily expand the fire area.
Professionals explain that a small amount of water will sink to the bottom after entering the pot, and it will not play a role in extinguishing the fire. The boiling point of water is 100℃, and the oil pan that catches fire at least is 200-300℃. When water is poured into a hot oil pan, it will vaporize quickly and expand rapidly. At the same time, the vaporized steam will bring the oil in the oil pan into the air, forming atomized oil droplets, which will burn quickly when encountering fire, leading to the spread of fire.