There are three main ways to extinguish fire
Definition of fire suppression: according to the conditions of combustion (i.e., fire triangle: fuel, ignition point, combustion supporting substance), the combustion of the fire triangle can be prevented by preventing the combustion of the fire triangleThe process of occurring or burning;Extinguishing methods: to prevent the complete fire triangle, to maintain a combustible environment, cool and airy (special substances to isolate the air);For the fire that has occurred, use fire sand, fire water, special fire extinguishers and other tools to achieve the purpose of fire fighting.
Basic methods of extinguishing fire(1) the isolation method isolates or removes the material that is burning and its surrounding fuel, so that it will burnStop short of fuel. Remove flammable items near the fire source and remove flammable buildings approaching the source of fire,Turn off flammable gas, liquid piping, valves, reduce and prevent combustible material from entering the burning area, etc..(2) asphyxiation prevents air from flowing into the combustion zone or dilutes the air with non burning inert gasThe substance does not get enough oxygen to go out. Such as carbon dioxide, nitrogen, water vapor and other inert gas perfusion containersPrepared with asbestos blanket, wet gunny bag, wet quilt, yellow sand and other non combustible or nonflammable covering on the burning, closedFire building or equipment doors and windows, holes, etc..(3) the cooling method directly fires the extinguishing agent (water, carbon dioxide, etc.) to the burning substance, and the temperature of the burning substanceReduce to below the flammable point, cause the combustion to cease; or spray the extinguishing agent on the fuel near the fire sourceThe flame radiation threat, to avoid the formation of a new point. This method is the main method of extinguishing fire.(4) inhibition method (chemical method) will spray the inhibited flame into the combustion zone and participate in the combustion reactionIn the process, the free radicals generated in the combustion reaction disappear, forming a stable molecule or a low active free radical,Terminate a combustion reaction. Currently used dry powder, fire extinguishing agent, 1211 and so on belong to this kind of extinguishing agent.
Extinguishing form:Cover: method of contact through the fire sand, wet quilts and other tools from combustible and air fire;Isolation: fire that has not been controlled can be isolated from nearby combustibles to keep fire under control. It is common in forest fires;Cooling: a common method is to use water to put out fire, and fire brigades often use high-pressure water cannons to spray flames to control the fire. Also, fire extinguishers, such as foam extinguishers, can be used to extinguish the fire.
