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Hydrogen Pipe Flame Arrestor

May 12, 2020

     Hydrogen Pipe Flame Arrestor

     At present, there are two main viewpoints about the working principle of the fire arrester: one is based on the heat transfer effect, the other is based on the wall effect. 

Heat transfer effect:

     One of the necessary conditions for combustion is to reach a certain temperature, the ignition point. below the ignition point, the burning will stop. According to this principle, the spread of the flame can be prevented by lowering the temperature of the burning material below its ignition point. When the flame passes through many small channels of the fire arrester, it becomes a few small flames. When designing the internal flame arresters, the contact area of the small flame and the wall of the passage is enlarged as far as possible, and the heat transfer is strengthened, so that the flame temperature drops below the ignition point, thus preventing the flame from spreading.

Wall effect:

     Combustion and explosion are not direct intermolecular reactions, but are stimulated by external energy, and the molecular bonds are destroyed to produce activated molecules, which are split into short-lived but active free radicals, which collide with other molecules to produce new products, also producing new free radicals that continue to react with other molecules. When the combustible gas passes through the narrow channel of the fire blocking element, the collision probability between the free radical and the channel wall increases, and the free radical participating in the reaction decreases. when the channel of the fire arrester is narrow to a certain extent, the collision between the free radical and the channel wall is dominant. because of the sharp decrease of the free base amount, the reaction can not continue, that is, the combustion reaction can not continue to propagate through the fire arrester.