What is the commonly used fire extinguishing method, chemical inhibition

There are many ways to extinguish a fire, but there are also many reasons. In general, there are two ways to extinguish the fire, one is the cooling method, any burning material has its ignition point, and when extinguishing the fire with the cooling method, it is only necessary to reduce the temperature of the burning object to below its ignition point, and the common practice of this method is to cool down with water or blowing; The other is called the isolation method, most of the combustion in our lives is maintained by the oxygen in the air, and when the fire is extinguished in this way, it is only necessary to cover the combustion with some non-flammable substances, so as to achieve the effect of isolating the air and extinguishing the fire. But it should also be noted that the fire extinguishing supplies in our lives should be the right choice.

Take fire extinguishers and fire hydrants as an example, if the fire is caused by electricity, it is better to use a fire extinguisher, because water also conducts electricity; If some special substances catch fire, such as magnesium, it can still burn in an environment with carbon dioxide, and the internal composition of the fire extinguisher just has carbon dioxide, so it should not be able to use a fire extinguisher, magnesium is also easy to react with water, so it is not possible to use a fire hydrant, then it should be covered with sand to achieve the effect of isolating the air to extinguish the fire. Therefore, the best fire extinguishing method still depends on the specific cause of the fire, and the specific situation should be analyzed on a case-by-case basis.

**The main reasons are to meet the following points; 1.Reach ignition point 2Adequate oxygen 3

Combustible. So we can use this to extinguish the fire. Of course, different situations are different.

For example. If magnesium catches fire, dry ice should not be used.

The fire was extinguished because of carbon dioxide.

The round magnesium reaction accelerates combustion. Hope.

Cooling method: reduce the ignition temperature.

Isolation method: control of combustibles. Asphyxiation method:

Control of combustibles. Inhibition method: It is to interrupt the chain reaction of combustion.

If the inhibiting fire extinguishing agent is sprayed into the combustion area, the combustion will be terminated, so as to achieve the purpose of fire extinguishing). The inhibiting fire extinguishing agent is sprayed into the combustion zone and participates in the process of controlling the combustion, thereby stopping the combustion. It is mainly used for dry powder fire extinguishers and "1211" fire extinguishers.

In chemical inhibition fire extinguishing, common fire extinguishing agents are dry powder and alkyl halides.

Types of fire extinguishing agents and their scope of application:

Substances that can effectively destroy the combustion conditions in the combustion zone and achieve inhibition or stop combustion are called fire extinguishing agents. Fire extinguishing agents can be broadly divided into two categories.

Physical and chemical extinguishing agents. The physical fire extinguishing agent does not participate in the combustion reaction, and plays a role in isolating the air and combustibles in the process of fire extinguishing to achieve the effect of extinguishing the fire, including water, foam and carbon dioxide.

Nitrogen, helium, and other inert gases.

Chemical fire extinguishing agents inhibit combustion by inhibiting the free radical chain reaction in the flame during the combustion process, mainly including dispersion halogen fire extinguishing agents, dry powder fire extinguishing agents and so on.

The main types of commonly used extinguishing agents are: water, water vapor, foam fire extinguishing agent, dry powder fire extinguishing agent, carbon dioxide balance stove rubber extinguishing agent and haloalkanes.

Extinguishant. 1.Water is a commonly used fire extinguishing agent, which has a significant cooling effect, can quickly cool the combustible, so that the combustion stops, but can not be used for the following substances: relative density.

flammable liquids smaller than water and insoluble in water (such as benzene, gasoline, etc.); In contact with water combustibles (e.g., the active metal potassium.

calcium, sodium, etc.); Strongly acidic substances (e.g., sulfuric acid, nitric acid.

hydrochloric acid, etc.); electrical equipment that has not been cut off; chemical equipment at high temperatures; Molten iron and molten steel.

2.Water vapor mainly plays a suffocating role in fire extinguishing, so that the combustible gas in the combustion area is diluted, and can also absorb certain gases, vapors and smoke, which helps to extinguish the fire and prevent poisoning.

3.Foam fire extinguishing agent is an effective fire extinguishing agent for extinguishing flammable and flammable liquids (or solids), which is divided into two categories: chemical foam fire extinguishing agent and air foam fire extinguishing agent.

Chemical foam fire extinguishing agent is mainly used to extinguish fires of non-water-soluble flammable and flammable liquids such as oil, but cannot be used to extinguish fires of chemical substances and electrical equipment that are water-resistant and acid-resistant.

There are mainly the following types of air foam fire extinguishing agents: protein foam fire extinguishing agents, which are mainly used to extinguish all kinds of water-insoluble combustible, flammable liquids and general combustible solid fires; Insoluble foam extinguishing agent, mainly used to extinguish methanol.

Ethanol, acetone.

fires of water-soluble flammable liquids; Fluoroprotein foam fire extinguishing agent, suitable for oil fire extinguishing at higher temperatures and liquid spray fire extinguishing; High multiples foam fire extinguishing agent, suitable for occasions where the fire source is concentrated and the foam is easy to accumulate.

The fire extinguishing principle of the inhibition method is the chemical interruption method, which is to make the fire extinguishing agent participate in the combustion reaction process, so that the free radicals generated in the combustion process disappear, and form stable molecules or low-activity free radicals, so that the combustion reaction is stopped, such as dry powder fire extinguishing agent extinguishing gas fire.

Dry powder fire extinguishing agent is made of fine particles made by mixing fire extinguishing base materials, such as baking soda, ammonium carbonate, ammonium salt of phosphoric acid, etc., and an appropriate amount of lubricant, such as magnesium stearate, mica powder, talcum powder, etc., and a small amount of moisture-proof agent, and uses volcanic carbon dioxide as the injection power.

The powder sprayed out, with dense concentration and fine particles, can form an isolation layer that hinders combustion when covered on solid combustibles, and at the same time precipitate non-combustible gas, so that the concentration of oxygen in the air is reduced and the flame is extinguished. The 8kg fire extinguisher can spray for 14 to 18 seconds, with a range of about 4m, which is suitable for extinguishing the initial disaster of oil, flammable gas, electrical equipment and other items.

Dry powder fire extinguishing agent can be filled in various types of portable and fixed dry stool hall powder leakage fire extinguishing devices, and can be used in combination with fluoroprotein foam fire extinguishing agent and water film-forming foam fire extinguishing agent to extinguish the initial disaster of the oil tank, which can quickly control the development of flames and play a role in rapid fire extinguishing.

Answer]: Noisy d

Chemical inhibition fire extinguishing method refers to the chain reaction of inhibiting the generation of free radicals or reducing the concentration of free radicals in the flame and interrupting the combustion chain reaction by making the fire extinguishing agent participate in the combustion reaction process. The fire extinguishing measure is to spray heptafluoropropane, hexafluoropropane fire extinguishing agent or dry powder fire extinguishing agent on the combustible material to interrupt the combustion chain reaction.

The common fire extinguishing agents for chemical inhibition fire extinguishing include dry powder fire extinguishing agent, foam fire extinguishing agent, etc.

1. Dry powder fire extinguishing agent.

Dry powder fire extinguishing agent can be filled in various types of portable and fixed dry powder fire extinguishing devices, and can be used in combination with fluoroprotein foam fire extinguishing agent and water film-forming foam fire extinguishing agent to extinguish the initial disaster of the oil tank, quickly control the development of flames, and play a role in rapid fire extinguishing. The products are widely used in oil fields, oil depots, oil refineries, chemical plants, chemical warehouses, ships, airports and industrial and mining enterprises.

2. Foam fire extinguishing agent.

Foam fire extinguishing agent can be an effective fire extinguishing agent for extinguishing flammable and flammable liquids, which mainly generates a condensed foam floating layer on the surface of the liquid, which plays the role of suffocation and cooling. Foam fire extinguishing agents are divided into chemical foams, air foams, fluoroprotein foams, aqueous film-forming foams and anti-soluble foams. It has a wide range of applications.

Effect of chemical inhibition on fire extinguishing:

The chemical inhibition method of fire extinguishing is fast, and when used properly, it can effectively extinguish the initial fire and reduce the loss of personnel and property. However, the inhibition method has a good effect on flamed fires, and the fire extinguishing effect is not ideal for deep fires due to poor permeability. If conditions permit, the fire extinguishing agent of the inhibition method will be used in combination with water, foam and other fire extinguishing agents to achieve satisfactory results.

Precautions for the use of fire extinguishers:

1. Do not put the ear killing liquid and the cover and bottom of the firearm against the human body to prevent the cover and bottom from popping out and hurting people.

2. Do not spray it with water at the same time, so as not to affect the fire extinguishing effect.

3. When extinguishing electrical fires, cut off the power supply as much as possible to prevent personnel from being electrocuted.

4. When extinguishing the fire, personnel should stand upwind. Distance about 2-5m from the fire source.

5. The hand holding the spray cartridge should be held at the glue nozzle to prevent frostbite.

6. After indoor use, ventilation should be strengthened. <>

Chemically inhibited fire extinguishing bucket refers to a fire extinguishing method that uses chemical reactions to extinguish fires. Common chemical extinguishing agents include carbon dioxide, foam, dry powder, and chloride.

Carbon dioxide is a colorless, odorless, and non-toxic gas that can react with oxygen in the air to form carbon dioxide and water vapor, thereby reducing oxygen concentration and extinguishing fires. Carbon dioxide fire extinguishers are widely used in fire extinguishing in electrical equipment, computer rooms, automobiles and other places.

Foam extinguishing agent is a chemical agent containing surfactant and foam stabilizer, which inhibits the spread of fire by creating foam and covering the fire source to isolate oxygen. Foam fire extinguishers are suitable for both liquid and solid fires.

Dry powder fire extinguishing agent is a powder containing silicates and carbonates, which achieves the effect of extinguishing fire through chemical reaction and physical action. Dry chemical fire extinguishers are suitable for liquid fires, gas fires and solid fires.

Chloride is a chemical substance containing chloride ions, which can react with hydrogen ions in the fire source to produce a large amount of water and hydrochloric acid gas, thereby reducing the temperature of the fire source and achieving the effect of extinguishing the fire. Chloride extinguishing agents are suitable for both liquid and gas fires.

In general, different kinds of chemical fire extinguishing agents are suitable for different types of fires, so when choosing a fire extinguishing agent, you need to choose it on a case-by-case basis. At the same time, it is necessary to pay attention to the lack of full operation of the Anyu car to avoid the occurrence of secondary accidents caused by misuse or improper operation.

Answer] :d chemical inhibition method refers to the participation of the fire extinguishing agent in the combustion reaction process, inhibiting the production of free radicals or reducing the concentration of free radicals in the flame, and interrupting the combustion chain reaction. The fire extinguishing measure is to spray heptafluoropropane, hexafluoropropane fire extinguishing agent or dry noise trapped powder fire extinguishing agent on the combustible material to interrupt the combustion chain reaction.

The inhibition method is also known as the chemical interruption method in the basic method of fire extinguishing. Right.

Inhibition method: The inhibition method mainly uses an inhibitory fire extinguishing agent to spray the flame to form stable molecules in the free radicals in the flame, so as to extinguish the flame, such as dry powder fire extinguishing agent and 1211 extinguishing fire extinguishing agent. Asphyxiation method:

The combustion of fire requires oxygen, and when it is ignited, the concentration of oxygen is reduced, which will reduce the fire, and inert gases such as carbon dioxide, nitrogen, and water vapor are used in real life to reduce the air concentration and achieve the purpose of extinguishing the fire.

1. Inhibition method: Inhibition method is one of the basic methods of fire extinguishing, also known as chemical method, which mainly uses inhibiting fire extinguishing agent to spray the flame to form stable molecules in the free radicals in the flame, so as to extinguish the flame, such as common dry powder fire extinguishing agent and 1211 fire extinguishing agent.

2. Suffocation method: The suffocation method is the basic method of extinguishing fire. The combustion of fire requires oxygen, and when it is ignited, the concentration of oxygen is reduced, which will reduce the fire, and inert gases such as carbon dioxide, nitrogen, and water vapor will be used to reduce the air concentration in real life, so as to achieve the purpose of extinguishing the fire.

3. Cooling method: Cooling method is the basic method of fire extinguishing. When using the cooling method to extinguish a fire, carbon dioxide or clean water is used to reduce the temperature of the surface of the burning material below the ignition point, and the flame will be extinguished, but the flame that has just been extinguished may rekindle, so when using the cooling method, it is necessary to continue watering for a period of time after the flame is extinguished.

4. Isolation method: The basic method of fire extinguishing is the isolation method. In the event of a fire, remove all the combustibles near the burning items in time to prevent the spread of the fire and avoid the fire from becoming too large, such as when the forest is on fire, the trees near the fire source will be cut down to create a separation zone to protect most of the trees.