Fire fighting methods and precautions

Four ways to extinguish fire

(1) Cooling method.

The fire extinguishing agent is sprayed directly onto the combustion product to lower the temperature of the burning substance below the ignition point and stop the combustion.

(2) Isolation method.

Evacuate or separate combustible materials at and around the source of ignition to stop combustion from being isolated from combustible materials.

(3) The suffocation method.

Prevent air from flowing into the combustion zone or dilute the air with non-combustible material, so that the combustion material does not get enough oxygen to extinguish.

(4) Interrupt chemical reaction method.

The fire extinguishing agent is involved in the combustion reaction process, so that the radicals generated in the combustion process disappear, and a stable molecular or active radical is formed, thereby interrupting the chemical reaction of the combustion.

Fire fighting precautions;

First, scouting first, then save. The concentration of fire smoke is large, and firefighters should not blindly save water when the situation of the fire is not clear. First, we should conduct reconnaissance and understanding of the storage and setting of fire materials, and then choose appropriate fire extinguishing agents to avoid mistakes or half the effort. For example, if a warehouse fires, the relevant personnel of the unit will immediately use water to save the fire. As a result, a large amount of bleach stored in the reservoir will generate heat and release a large amount of chlorine gas, which not only affects the fire but also increases the fire damage several times. In addition, for oil-insoluble substances such as oil, it is advisable to use foam fire extinguishing agent or sand to suffocate fire. For electrical equipment fires, use carbon dioxide fire extinguishing agent to save.

Second, choose a reasonable way of water. If the reconnaissance indicates that the fire is not afraid of moisture and water-repellent substances, then according to the different burning objects, due to the "love", use appropriate water to extinguish the fire. For cotton, paper and other combustibles, fires should be selected as small caliber water guns and flowering water guns. Spray-dilution and cooling of spray guns for combustible dust fires can be achieved by reducing the amount of water produced.

Third, timely timely evacuation of materials. The fire materials are threatened by fire to varying degrees. The general evacuation principle is to evacuate materials that have an impact on fire fighting and may expand the fire, such as poisonous products, flammable and explosive chemical dangerous goods and valuable materials. Sometimes, in order not to affect the water spray, the water-repellent materials should be first evacuated to the fire site. For large-scale fire sites, fire extinguishers can be used for partial cover, and personnel can be quickly evacuated. If you can't evacuate for a while, cover it with a waterproof covering such as plastic cloth, and then rescue it.

Fourth, properly resolve the contradiction between the protection of the scene and the rescue of materials, and minimize losses. After the fire is extinguished, in order to accurately investigate the cause of the fire, the site must be strictly protected, but this will increase the water loss to a certain extent. After a fire broke out in a finished tobacco warehouse, thousands of cigarettes were not evacuated in time during the three-day investigation of the fire, and they were lost due to water immersion and steam fumigation. Therefore, in the field protection, in accordance with the principle of reducing losses, under the guidance of the public security fire department, reasonable rescue of some of the remaining materials, or pumping water from the fire to reduce water loss.

What you said above is the basic method of extinguishing fire.

When you say the method, you have to say the elements of combustion. There are three elements and four elements in the combustion.

The three elements: the burning of any substance must have the following three conditions: combustibles, oxidants and temperature (ignition source). The three are indispensable.

The above can only represent the flameless combustion. Most of the combustion we usually refer to is flaming combustion. There must be four necessary conditions for flaming combustion: combustibles,

Oxidant, temperature and uninhibited chain reaction.

To extinguish a fire is actually very simple, it is necessary to remove any one of the necessary conditions.

Cooling method: temperature

Choking method: oxidant

Isolation method: remove combustibles

The details are not bad here.

Fire fighting methods: cooling, isolation, suffocation, chemical suppression

Note: 1. Electrical appliances can not use water and foam fire extinguishing agents, should use carbon dioxide fire extinguishers and dry powder

2. Liquid can not be used in a fire

The 3.1211 fire extinguisher is disabled and has damage to the ozone layer.

4. Household appliances cannot use dry powder, and carbon dioxide fire extinguishers should be used. What are the fire fighting methods and what are the precautions?

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