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Pressure swing adsorption nitrogen machine (PSA nitrogen machine) is a carbon molecular sieve as adsorbent, the use of pressure adsorption, pressure desorption principle of adsorption and release of oxygen from the air, so as to separate nitrogen automatic equipment. Carbon molecular sieve is a kind of coal as the main raw material, after grinding, oxidation, molding, carbonization and special pass processing process, the surface and the interior is covered with micropores of the columnar granular adsorbent, black. No heat drying machine 1-- 201307


The pore size distribution of carbon molecular sieves enables the kinetic separation of O2 and N2. This pore size distribution allows different gases to diffuse into the pores of the molecular sieve at different rates, without repelling any of the gases in the mixture (air). The separation effect of carbon molecular sieve on O2 and N2 is based on the slight difference between the kinetic diameters of the two gases. The kinetic diameter of O2 molecule is small, so it has a faster diffusion rate in the micropores of carbon molecular sieve, while the kinetic diameter of N2 molecule is large, so the diffusion rate is slow. The diffusion of water and CO2 in compressed air is not much different from that of oxygen, while argon diffuses more slowly. Finally, the mixture of N2 and Ar is enriched from the adsorption column.

With the increase of adsorption pressure, the adsorption capacity of O2 and N2 increases at the same time, and the increase of adsorption capacity of O2 is larger. The pressure swing adsorption period is short, and the adsorption amount of O2 and N2 is far from reaching the equilibrium (maximum value), so the difference in the diffusion rate of O2 and N2 makes the adsorption amount of O2 greatly exceed the adsorption amount of N2 in a short time.


Pressure swing adsorption nitrogen machine (PSA nitrogen machine) is the use of carbon molecular sieve selection adsorption characteristics, the use of pressure adsorption, decompression desorption cycle, so that compressed air alternately into the adsorption tower (can also be completed in a single tower) to achieve air separation, so as to continuously produce high-purity product nitrogen.


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