Where can dry powder fire extinguishers be used

There are many types of fire extinguishers, among which dry powder extinguishers are the most commonly used ones. Dry powder fire extinguishers use carbon dioxide gas or nitrogen gas as the power to spray the dry powder inside the bottle to put out the fire. Dry powder is a dry, easy-to-flow micro-fine solid powder, consisting of base material to extinguish the fire and additives such as moisture inhibitors, flow promoters, caking prevention agents. This article introduces the principle, scope of application, and usage of dry powder fire extinguishers.

Here is the list of contents

• Principle of dry powder fire extinguisher

• The scope of the dry powder fire extinguishers' application

• The use of dry powder fire extinguishers

Principle of dry powder fire extinguisher

The dry powder extinguisher is filled with a dry powder extinguishing agent. A dry powder extinguishing agent is a dry and easy-to-flow microfine powder used to extinguish the fire, consisting of inorganic salts and a small number of additives that are dried, crushed, and mixed into a microfine solid powder. The use of compressed carbon dioxide blowing dry powder (mainly containing sodium bicarbonate) to extinguish the fire. Dry powder fire extinguishers are used to prevent the flow of air into the combustion area so that the combustion material does not get enough oxygen and is extinguished to achieve the purpose of fire extinguishing, this method of fire extinguishing we usually call the asphyxiation method.

The scope of the dry powder fire extinguishers' application

Dry powder extinguishers can be divided into sodium bicarbonate dry powder extinguishers and ammonium phosphate dry powder extinguishers. Sodium bicarbonate dry powder fire extinguishers for flammable, combustible liquids, gases, and electrical equipment for the initial fire; ammonium phosphate dry powder fire extinguishers can be used in addition to the above-mentioned types of fires, but also to fight the initial fire of solid substances. But these two dry powder fire extinguishers cannot put out metal combustion fires.

The use of dry powder fire extinguishers

Dry powder fire extinguishers to put out flammable, flammable liquid fires, should be aimed at the flame to sweep the part, if the liquid fires being put out is flowing combustion, should be aimed at the root of the flame from near and far, and sweep around until the flame is all extinguished. If the combustible liquid burning in the container, the user should be aimed at the root of the flame left and right swaying sweep, so that the sprayed dry powder stream covers the entire surface of the container opening; when the flame is driven out of the container, the user should still continue to spray until the flame is completely extinguished. When fighting a flammable liquid fire in a container, care should be taken not to spray the nozzle directly against the liquid surface to prevent the impact of the jet stream to splash out the flammable liquid and expand the fire, causing difficulties in extinguishing the fire. If when the combustible liquid in the metal container burning time is too long, the wall temperature of the container has been higher than the spontaneous combustion point of the combustible liquid, it is very easy to cause the phenomenon of re-ignition after extinguishing the fire, if used in conjunction with foam fire extinguishers, it is more effective in extinguishing the fire.

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