Cooling method
The principle of this method is to spray the fire extinguishing agent directly onto the burning object to reduce the burning temperature below the ignition point, so that the combustion stops. Or spraying the fire extinguishing agent on the material near the fire source so that it does not form a new point of ignition because of the heat radiation of the flame. Cooling fire extinguishing method is a main method of extinguishing fire, often using water and carbon dioxide as fire extinguishing agent cooling and cooling. The extinguishing agent does not participate in the chemical reaction during the fire extinguishing process. This method belongs to the physical fire extinguishing method.
Segregation
The isolation and extinguishing method is to isolate or remove the burning substance and the combustible material around it, interrupting the supply of combustible material and stopping the combustion because of the lack of combustible matter. The specific methods are:
1. To remove flammable, flammable, explosive and combustion-supporting items near the source of fire;
2. Close the valves of flammable gas and liquid piping to reduce and prevent combustible substances from entering the burning zone;
3. Try to block the dispersed flammable and combustible liquids;
4. Remove the flammable building adjacent to the fire source to form a space zone to prevent the spread of the fire.
Asphyxiation method
The suffocating fire extinguishing method is to prevent the air from flowing into the burning zone or to dilute the air with the unburned material and extinguish the burning material without enough oxygen. The specific methods are:
1. Using sand, cement, wet sacks, wet quilts and other nonflammable or combustible substances cover the burning;
2. Spraying mist-like water, dry powder, foam and other fire extinguishing agent covering the combustion;
3. Use of steam or nitrogen, carbon dioxide, such as inert gas perfusion of fire containers, equipment;
4. Closed fire construction, equipment and holes;
5. The spraying of nonflammable gases or nonflammable liquids (e.g. carbon dioxide, nitrogen, carbon tetrachloride, etc.) into the burning area or on the burning substance.