The fire extinguishing effect of water mainly has the following kinds.
When the water and the Gertun thing to sleep or flow through the check Chu area, will be heated or vaporized, absorbing heat, so that the temperature of the burning area is greatly reduced, resulting in the suspension of combustion. Each kilogram of a water temperature rise 1 ℃, can absorb heat 4184J, each kilogram of water evaporation vaporization, can absorb heat 2259kJ.
After the water enters the combustion area, will produce a lot of water vapor to occupy the combustion area, can prevent fresh air into the combustion area, reducing the concentration of oxygen in the combustion area, so that combustible materials can not be supplemented by oxygen, resulting in the suspension of combustion.
Water itself is a good solvent, can dissolve water-soluble A, B, C liquids, such as alcohols, aldehydes, ethers, ketones, esters, etc. Therefore, when such substances on fire, if the capacity of the container allows or combustible material dispersion, can be diluted with water. Due to the concentration of combustible materials and the amount of combustible vapor is reduced, so that the combustion is weakened. When the concentration of combustible liquids down to below the combustible concentration, combustion is suspended.
Under the action of mechanical force, the DC water gunshot out of the intensive water flow, with a strong impact and kinetic energy. High-pressure water flows strongly impact the burning material and flame, can be scattered burning material so that the intensity of combustion is significantly reduced; water can also break the flame so that it is extinguished.
Non-water-soluble combustible liquids of the initial fire, before the formation of heatwaves, with a strong water mist jet (or drop jet) fire, can be formed on the surface of the liquid “water-in-oil” type emulsion, the degree of stability of the emulsion with the increase in viscosity of combustible liquids and increase, heavy oil can even form a water-containing oil foam. The emulsification of water can make the liquid surface is cooled, so that the rate of combustible vapor generation is reduced, resulting in the suspension of combustion.