What kinds of fire extinguishers do you use? What are the principles of fire fighting?
The flowing fine powder consists of fine inorganic powder which is dried, crushed and mixed with inorganic salts and a small amount of additives with extinguishing effect. Use compressed carbon dioxide to blow out dry powder (mainly containing sodium bicarbonate) to put out the fire.
Foam extinguisherPrinciple: there are two containers in the foam extinguisher, which contain two kinds of liquid respectively. They are aluminium sulfate and sodium bicarbonate solution. The two solutions do not contact each other, and no chemical reaction occurs. When you need a foam extinguisher, put the extinguisher upside down and mix the two solutions together, which will produce a large amount of carbon dioxide gas:Principles of foam extinguisherIn addition to the two reactants, a number of blowing agents were added to the fire extinguisher. Open the switch; the foam is ejected from the fire extinguisher, covering the burning material, isolating the burning substance from the air, and lowering the temperature to achieve the purpose of extinguishing the fire.Structure: fire extinguisher comprises a cylinder body, cylinder cover, sulfate liner, nozzle and other components. The cylinder body is provided with a sodium bicarbonate solution, sulfuric acid with sulfuric acid in the glass liner. The export of lead plug, used to seal the bottle, liquid mixed with anti dilution in concentrated sulfuric acid or water bottle with the bottle. The principle of acid base fire extinguisher is to use two chemicals to produce chemical reaction after mixing, to produce pressure, to release the medicament, and to extinguish the fire.
Structure: dry powder fire extinguisher uses carbon dioxide gas or nitrogen gas as motive power to spray dry powder out of the bottle. Dry powder is a dry, easy to flow micro solid powder, composed of fire extinguishing base and moisture-proof agent, flow enhancer, caking agent, and other additives.
