Principle of nitrogen production by nitrogen generator system

The diffusion speed of oxygen and nitrogen molecules on the surface of molecular sieve is different. The gas molecules with smaller diameter (O2) diffuse faster and more enter the micropores of carbon molecular sieve. The gas molecules with larger diameter (N2) diffuse slower and less enter the micropores of carbon molecular sieve. Due to the different selective adsorption of nitrogen and oxygen on carbon molecular sieves, oxygen is enriched in short-term adsorption phase, gas phase, oxygen nitrogen separation and gas phase enrichment under PSA conditions.

Variation curve of adsorption capacity of carbon molecular sieve for oxygen and nitrogen under different pressures: after a period of time, the adsorption capacity of carbon molecular sieve for oxygen reaches equilibrium. According to the different characteristics of carbon molecular sieve for adsorbing gas under different pressures, reduce the pressure to release the adsorption capacity of carbon molecular sieve for oxygen. This process is regeneration. According to the different regeneration pressure, it can be divided into vacuum regeneration and atmospheric regeneration. Atmospheric pressure regeneration is conducive to the complete regeneration of molecular sieve, and it is easy to obtain high purity gas.

PSA nitrogen generator is a nitrogen generator designed and manufactured according to PSA technology. Usually, two adsorption towers are used in parallel, and the automatic control system strictly controls the time sequence according to the specific programmable, alternately carries out pressurized adsorption and decompression regeneration, so as to complete the separation of nitrogen and oxygen, and obtain the required high-purity nitrogen.

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