Separation principle of Nitrogen Carbon Molecular Sieve
Date:Separation principle of Nitrogen Carbon Molecular Sieve
After the gas is reduced and filtered by the compressor, it enters the filtration device of the polymer membrane because the solubility and diffusion coefficient of each gas in the membrane are different, which causes each vapor to be The rate of penetration in the membrane is different. According to this feature, the gas can be divided into "quick gas" and "slow gas".
In general, there are a total of two A, B in the Carbon Molecular Sieve adsorption tower for nitrogen production. Then, when pure compressed air flows from the inlet of the A column through the Carbon Molecular Sieve to the outlet end, O2, CO2 and H2O are adsorbed by it, and nitrogen is then discharged from the outlet end of the adsorption tower. After a while, the Carbon Molecular Sieve in Tower A will absorb saturation.
At this time, the A tower will automatically stop the adsorption, so that the compressed air will flow into the B tower to absorb oxygen to produce nitrogen, and then the Carbon Molecular Sieve of the A tower will be regenerated. The regeneration of Carbon Molecular Sieve is generally achieved by an adsorption tower that rapidly drops it, or removes adsorbed O2, CO2 and H2O at atmospheric pressure. Both towers are generally adsorbed and regenerated, thereby completing the separation of oxygen and nitrogen and continuously outputting nitrogen.
Therefore, when the nitrogen purity of the outlet end is set to a value, the automatic venting valve will open, and then the unqualified nitrogen will be automatically vented, thus ensuring that the unqualified nitrogen does not flow to the gas point, when the mixed gas is on both sides of the membrane. Under the effect of differential pressure, the permeation rate generally depends on the fast gas, such as hydrogen, helium and co2, after penetrating the membrane, it will be enriched on the infiltration side of the membrane, and the infiltration rate depends on the too slow gas, and then Achieve the purpose of the mixed gas separation.