In daily life and industrial production, fire is a common and destructive disaster. In order to effectively deal with fire, people have invented a variety of fire extinguishing agents and fire extinguishing equipment, among which dry powder fire extinguishing agents are favored because of their wide applicability and efficient fire extinguishing ability.
The fire extinguishing principle of dry powder extinguishing agent is complex and comprehensive, mainly including the following aspects:
1.Chemical inhibition: This is the most core fire extinguishing mechanism of dry powder fire extinguishing agent. When the dry chemical powder is sprayed on the flame, its extinguishing group will decompose rapidly at high temperature and produce a large number of free radicals. These free radicals react with free radicals such as H and OH produced in the flame combustion reaction, thereby trapping and terminating the free radicals in the combustion chain reaction, reducing the combustion reaction rate until the flame is extinguished.
2.Asphyxiation: The dry powder extinguishing agent will be covered on the surface of the fuel during the injection process, forming a thick dry powder layer. This dry powder layer prevents the contact between air (mainly oxygen) and the fuel, thus preventing the combustion from continuing. This asphyxiating effect is particularly evident when putting out solid material fires.
3.Cooling effect: The dry powder extinguishing agent in the combustion flame will also occur a series of endothermic decomposition reactions, these reactions can absorb the heat in the flame, reduce the flame temperature. Although cooling is not the main extinguishing mechanism of dry powder fire extinguishing agent, it helps to accelerate the extinguishing process of flame to a certain extent.
4.Isolation: The dry powder layer formed after the spray of dry powder extinguishing agent can also isolate the combustible material from the flame and prevent the spread of the fire. This isolation is especially important when fighting a large area fire, which helps to control the extent of the fire and reduce fire losses.
As an efficient and multi-functional fire extinguishing tool, dry powder fire extinguishing agent plays an important role in fire prevention and control. Through in-depth understanding of its fire extinguishing principle and application methods, we can better use this tool to protect life and property safety.