Preheating zone: Leaving the fuel / oxidizer still lacks the necessary temperature to react by increasing the area according to following approaches. Reaction zone: Once the ignition temperature of mixture reached releasing heat and reacts forming products according to reactants. Post reaction zone: The reaction product gases are cooling and stop emitting light (flame arrester).
Automatic extinguishing barriers are used in conjunction with infrared fire detectors for initiating the release of pressurized extinguishing agents and thus extinguish a fire and possibly end the influx of explosive mixture. A blaze-arrester (or arresters or blaze arrestor) is a protection against fire and explosion whose function is to limit the combustion through the extinction of fire.
The effect is based on that a blaze front is cooled by internals (z. B. Coiled sheet metal screens, gravel) to extent that a fire cannot spread further behind the blaze-arrester. A distinction is made between: Which type is used by fire-arresters depends in practice on media, distance to source of ignition and the application (tube fuse, end stop) from.
The deflagration is used to prevent the spread of explosion in quasi pressureless closed systems by the blaze is extinguished in backup. To this end, tape backups are used with narrow gaps and earlier gravel beds. They must be installed close to location of ignition. Upstream and downstream straight pipe lines shall not exceed a ratio of diameter to length (D / L) of 1:50.
The elements that constitute the blaze-arrester must be durable enough since their rupture could result in formation of openings large enough to let pass a blaze, negating the function. An example of application of blaze-arresters is the Davy lamp used in mines; in this case the function of fire-arrester is carried out by a dense wire mesh surrounding the lamp, preventing fire from spreading to outside of that network. In home, sometimes you place a wire mesh (called "fire arrestor plate") above the kitchen stove: this wire mesh acts as a blaze-arrester. On the same principle underlying the operation of spark arrester of fireplaces.
The additional heat evaporates wax wick. Some of wax vapor forming burning carbon dioxide CO2 and water, moreover becomes lower molecular weight hydrocarbons, carbon and molecule fragments. Eventually, some of these intermediates also converted to carbon dioxide and water in combustion process. In chemistry labs are used frequently called bunsen burners, whose name is due to German chemist Robert Wilhelm Bunsen. In such devices, the gas used may be methane, propane or butane. If the gas supply is constant, blaze temperature depends on the amount of mix air with the combustion gas prior to combustion.
The detonation safety extinguish the flames in pipes after a gas explosion and prevent the spread. A stable detonation forms in a pipeline from a ratio D / L of greater than 1: 200 from. In case of D / L ratios from 1:50 to 1: 200, unstable detonations form, which should be avoided for the installation of detonation arresters as possible. Is characterized by a detonation fire speeds in supersonic range (about 1600 to 2000 m / s). The blaze spread through a detonation in more distant parts of plant can be prevented by detonation flame-arresters.
In this process more heat than in previous case, so that blaze temperature increases and the color changes from yellow to blue is released. The domestic gas (methane, propane, butane) used for cooking is usually premixed with air to make the blaze is blue (this is to ensure complete combustion of gas introduced into burners). In laboratory is used when working with glass, torch oxygen / methane for scientific glass blowing. Its blaze is hot enough to melt quartz (the melting point of quartz is about 1,600 degrees C). In industry for higher temperature fire cutting and welding metals are needed.
Automatic extinguishing barriers are used in conjunction with infrared fire detectors for initiating the release of pressurized extinguishing agents and thus extinguish a fire and possibly end the influx of explosive mixture. A blaze-arrester (or arresters or blaze arrestor) is a protection against fire and explosion whose function is to limit the combustion through the extinction of fire.
The effect is based on that a blaze front is cooled by internals (z. B. Coiled sheet metal screens, gravel) to extent that a fire cannot spread further behind the blaze-arrester. A distinction is made between: Which type is used by fire-arresters depends in practice on media, distance to source of ignition and the application (tube fuse, end stop) from.
The deflagration is used to prevent the spread of explosion in quasi pressureless closed systems by the blaze is extinguished in backup. To this end, tape backups are used with narrow gaps and earlier gravel beds. They must be installed close to location of ignition. Upstream and downstream straight pipe lines shall not exceed a ratio of diameter to length (D / L) of 1:50.
The elements that constitute the blaze-arrester must be durable enough since their rupture could result in formation of openings large enough to let pass a blaze, negating the function. An example of application of blaze-arresters is the Davy lamp used in mines; in this case the function of fire-arrester is carried out by a dense wire mesh surrounding the lamp, preventing fire from spreading to outside of that network. In home, sometimes you place a wire mesh (called "fire arrestor plate") above the kitchen stove: this wire mesh acts as a blaze-arrester. On the same principle underlying the operation of spark arrester of fireplaces.
The additional heat evaporates wax wick. Some of wax vapor forming burning carbon dioxide CO2 and water, moreover becomes lower molecular weight hydrocarbons, carbon and molecule fragments. Eventually, some of these intermediates also converted to carbon dioxide and water in combustion process. In chemistry labs are used frequently called bunsen burners, whose name is due to German chemist Robert Wilhelm Bunsen. In such devices, the gas used may be methane, propane or butane. If the gas supply is constant, blaze temperature depends on the amount of mix air with the combustion gas prior to combustion.
The detonation safety extinguish the flames in pipes after a gas explosion and prevent the spread. A stable detonation forms in a pipeline from a ratio D / L of greater than 1: 200 from. In case of D / L ratios from 1:50 to 1: 200, unstable detonations form, which should be avoided for the installation of detonation arresters as possible. Is characterized by a detonation fire speeds in supersonic range (about 1600 to 2000 m / s). The blaze spread through a detonation in more distant parts of plant can be prevented by detonation flame-arresters.
In this process more heat than in previous case, so that blaze temperature increases and the color changes from yellow to blue is released. The domestic gas (methane, propane, butane) used for cooking is usually premixed with air to make the blaze is blue (this is to ensure complete combustion of gas introduced into burners). In laboratory is used when working with glass, torch oxygen / methane for scientific glass blowing. Its blaze is hot enough to melt quartz (the melting point of quartz is about 1,600 degrees C). In industry for higher temperature fire cutting and welding metals are needed.
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