Flame arresters, also known as fire extinguishers and pipe flame arresters, prevent external flames from entering the equipment, pipes, or flames that contain flammable and explosive gases or prevent flames from spreading between equipment and pipes. I don't know if you understand its principle, structural performance and maintenance matters. Let's take a look at it with Xiaobian!
The principle of the flame arrester:
There are two main points about the working principle of the flame arrester: one is based on heat transfer; the other is based on the wall effect.
1, heat transfer
One of the necessary conditions for combustion is to reach a certain temperature, that is, the point of ignition. Below the point of ignition, the combustion will stop. According to this principle, as long as the temperature of the burning substance is lowered below its ignition point, the spread of the flame can be prevented. When the flame passes through many small passages of the fire arresting element, it will become a few small flames. When designing the fire-blocking element inside the flame arrester, the contact area between the small flame and the channel wall is enlarged as much as possible, and the heat transfer is enhanced to lower the flame temperature below the ignition point, thereby preventing the flame from spreading.
2, wall effect
Combustion and explosion are not direct reactions between molecules. Instead, they are excited by external energy. The molecular bonds are destroyed and activated molecules are generated. The activated molecules are split into short-lived but very active free radicals. The free radicals collide with other molecules. , to generate new products, while also generating new free radicals and then continue to react with other molecules. When the combustible combustible gas passes through the narrow passage of the flame arresting element, the collision probability of the radical with the passage wall increases, and the radicals participating in the reaction decrease. When the channel of the flame arrester is narrow to a certain extent, the collision of free radicals with the channel wall predominates. Due to the sharp decrease in the number of free radicals, the reaction cannot continue, that is, the combustion reaction cannot continue to propagate through the flame arrester.
As the size of the flame arrester channel decreases, the probability of collision between the free radical and the reactive molecule decreases, and the collision probability of the free radical and the channel wall increases, which promotes the reduction of the free radical reaction. When the channel size is reduced to a certain value, this wall effect causes the flame to continue to propagate, and the flame is prevented. The wall effect is therefore the main mechanism for preventing flames.
Structural performance of the flame arrester:
1. The anti-explosion performance is qualified. The flame arrester is tested for subsonic flame for 13 times in a row, which can prevent the flame from passing through each time.
2. It has good resistance to burning and has no tempering phenomenon for 1 hour. 3. The shell water pressure test is qualified, and the water pressure test is 2.4 MPa without leakage. Reasonable structure, light weight and corrosion resistance. Easy to repair and easy to install. The flame arrester core is made of stainless steel and is corrosion resistant and easy to clean.
The flame arrester is mainly composed of a casing and a filter. The housing should have sufficient strength to withstand the impact pressure generated by the explosion. The filter element is the main component that blocks the flame propagation. Commonly used are metal mesh filter and corrugated filter. The metal mesh filter element is made of stainless steel or copper mesh with a diameter of 0.23~0.315mm, and is composed of multiple layers. At present, domestic fire arresters usually use 16~22 mesh metal mesh, which is 4~12 layers.
The corrugated filter element is supported by stainless steel, copper-nickel alloy, aluminum or aluminum alloy. The corrugated flame arrester can block the violent flame of detonation and can withstand the corresponding mechanical and thermal effects, with low flow resistance and easy to clean and replace.
Maintenance of the flame arrester:
1. In order to ensure the performance of the flame arrester to achieve the purpose of use, before installing the flame arrester, you must carefully read the instructions provided by the manufacturer, and carefully check whether the label and the installed pipeline requirements are consistent.
2. The flow direction mark on the flame arrester must be consistent with the flow direction of the medium.
3. Check it every six months. Check the fire barrier for defects such as blockage, deformation or corrosion.
4. The blocked fire-retardant layer should be cleaned to ensure that each hole is unblocked, and the fire-resistant layer that is deformed or corroded should be replaced.
5. When cleaning the core of the flame arrester, it should be purged with high pressure steam, non-corrosive solvent or compressed air. It should not be brushed with sharp hardware.
6. When reinstalling the fire barrier layer, the gasket should be renewed and the sealing surface should be clean and free from damage and air leakage.
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