Carbon molecular sieve is a kind of carbon molecular sieve with a pore size of 3.0 angstrom on the surface and a space much larger than 3.0 angstrom inside, so that oxygen molecules in compressed air can enter the carbon molecular sieve through the pore size on the surface of high-quality carbon molecular sieve. Therefore, what actually plays the role of nitrogen production is only the surface part of carbon molecular sieve, and its interior is only used as the adsorption, storage and desorption of oxygen molecules. When the low-quality carbon molecular sieve tube cavity has tunnel effect, resulting in the peeling off of the carbon molecular sieve surface, when the dust of carbon molecular sieve peels off by one tenth, its effect may have been lost, rather than just one tenth.
Countermeasure 1:
In order to solve the above nitrogen production problems, the displacement of carbon molecular sieve in the lumen during pressure rise and pressure drop must be limited to avoid tunnel effect. Nitrogen production by multi lumen method is the only method that can limit the movement of carbon molecular sieve in the lumen to the tube wall. That is, the adsorption tower is changed into several cavities with different numbers, and then the modules are connected in parallel to meet the nitrogen demand. Through the analysis of experimental data, it is proved that the cavity diameter of 18cm carbon molecular sieve can just limit the displacement of carbon molecular sieve. When it is too thick, it will produce tunnel effect, and when it is too thin, it will increase pressure drop and energy consumption.
Countermeasure 2:
In order to solve the problem that the gap between molecular sieves is caused by the loose filling of carbon molecular sieves, the tunnel effect is caused in the process of pressure rise and pressure drop. The nitrogen generator uses the patented snowstorm filling method when filling carbon molecular sieve. The carbon molecular sieve is rotated and inserted into the lumen by pneumatic power. Due to the rotary compression power, the carbon molecular sieve is drilled into all spaces under the simultaneous action of pressure, gravity and centrifugal force. To obtain a tight fill. No spalling and pulverization will occur between carbon molecular sieves.
