What are the principles and methods of using carbon dioxide fire extinguishers?

Update:03 Jun 2021

Carbon dioxide fire extinguishing agent is a kind of fire extinguishing agent with a history of more than one hundred years. It is cheap, easy to obtain and prepare. It mainly relies on suffocation and partial cooling to extinguish fire. Carbon dioxide has a higher density, about 1.5 times that of air. Under normal pressure, liquid carbon dioxide will vaporize immediately. Generally, 1kg of liquid carbon dioxide can produce about 0.5 cubic meters of gas. Therefore, when extinguishing a fire, carbon dioxide gas can exclude air and surround the surface of the burning object or distribute it in a relatively closed space, reduce the oxygen concentration around the combustible or in the protective space, and produce asphyxiating effect to extinguish the fire. In addition, when carbon dioxide is ejected from the storage container, it will quickly vaporize from the liquid into a gas, and attract some heat from the surroundings to play a cooling role.

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Carbon dioxide fire extinguishers are mainly used to extinguish the first fires of valuable equipment, archives, instruments, electrical equipment below 600 volts, and oil. When in use, first bring the fire extinguisher to the fire location, put down the fire extinguisher, pull out the safety pin, hold the handle at the root of the horn with one hand, and hold the handle of the opening and closing valve tightly with the other hand. For carbon dioxide fire extinguishers without spray hoses, the horn should be raised 70-90 degrees. When in use, do not directly grasp the outer wall of the loudspeaker or the metal connecting pipe by hand to prevent frostbite. When using a carbon dioxide fire extinguisher, if it is used outdoors, it should be sprayed in the windward direction; if it is used in a small indoor space, the operator should leave quickly after the fire is extinguished to prevent suffocation