CMS Carbon Molecular Sieve (CMS) nitrogen generation technology is a mature and widely adopted Pressure Swing Adsorption (PSA) nitrogen production technology in the industrial field, relying on the selective adsorption performance of carbon molecular sieves to separate nitrogen and oxygen in compressed air. The core advantage of CMS materials lies in their unique micropore structure, which can screen gas molecules according to molecular diameter and diffusion rate. Oxygen molecules have a smaller diameter and faster diffusion speed, so they can quickly enter the micropores of carbon molecular sieves and be adsorbed, while nitrogen molecules have a larger diameter and slower diffusion speed, making them unable to be adsorbed and thus separated as finished gas. This physical adsorption separation process does not involve chemical reactions, ensuring safe, efficient, and pollution-free nitrogen production.

The entire CMS nitrogen generation system operates in a cyclic alternating adsorption and desorption mode with two adsorption towers to achieve continuous gas production. Firstly, compressed air treated by pre-filtration, de-oiling, and dehumidification is transported to the adsorption tower. Under the set working pressure of 0.8 to 1.0 MPa, the carbon molecular sieve in the tower rapidly adsorbs oxygen, water vapor, carbon dioxide, and other impurities in the air, and pure nitrogen flows out from the outlet of the adsorption tower and enters the buffer tank for storage. While one tower is in the adsorption working state, the other tower is in the desorption regeneration state, realizing uninterrupted system operation.

The desorption and regeneration process is the key to the cyclic operation of the CMS system. After the adsorption tower works for a fixed period, the system automatically releases pressure to reduce the internal pressure to normal pressure. At this time, the oxygen and other impurity gases adsorbed in the micropores of the carbon molecular sieve are desorbed and discharged out of the tower with the exhaust gas, restoring the adsorption capacity of the molecular sieve. The two towers alternately switch working states through the automatic control system, with a switching cycle of generally 60 to 120 seconds. The purity and gas production volume of CMS nitrogen generators can be adjusted by controlling working pressure, adsorption time, and air intake flow, which can meet the nitrogen demand of different industrial scenarios from 99.5% to 99.99% purity.