PSA (Pressure Swing Adsorption) nitrogen generation technology based on CMS carbon molecular sieve is the most mainstream and mature nitrogen production technology in the industrial field, relying on the selective adsorption characteristics of carbon molecular sieve to separate oxygen and nitrogen in compressed air to obtain high-purity nitrogen. The core of the PSA CMS nitrogen generator system is the carbon molecular sieve adsorption tower, which uses the difference in diffusion speed of oxygen and nitrogen molecules under different pressure conditions to realize rapid separation. When the system is pressurized, oxygen molecules with small particle size are quickly adsorbed by the carbon molecular sieve, while nitrogen molecules with large particle size are retained and output as finished gas; when decompressed, the adsorbed oxygen is desorbed, and the molecular sieve is regenerated to realize cyclic and continuous nitrogen production.

The system composition of PSA CMS nitrogen generators is complete and systematic, including air compression unit, air purification pretreatment unit, PSA adsorption separation unit, nitrogen buffering and pressure stabilization unit, and intelligent control unit. The pretreatment unit is composed of filters, dryers, and oil-water separators, which can effectively remove oil, water, and particulate impurities in compressed air, prevent molecular sieve pollution and failure, and ensure the service life and separation efficiency of CMS carbon molecular sieve. The dual-tower alternating adsorption design is adopted in the core separation unit, which ensures uninterrupted nitrogen output and stable gas purity. Compared with membrane separation and cryogenic nitrogen production technology, PSA carbon molecular sieve systems have prominent advantages of low investment cost, fast startup speed, and simple operation, and can reach stable nitrogen purity within 10–15 minutes after startup.

The performance advantages and application scope of PSA CMS nitrogen generator systems are extremely extensive. The equipment can stably produce nitrogen with purity ranging from 95% to 99.999% by adjusting system parameters, meeting the nitrogen demand of light industry, chemical industry, food, electronics, and mechanical processing industries. In terms of operation and maintenance, the system has a high degree of automation, realizing full-automatic unmanned operation, with low failure rate and simple daily maintenance. With the upgrading of carbon molecular sieve materials, modern PSA systems adopt high-strength anti-aging CMS materials, which effectively avoid molecular sieve pulverization and failure, greatly extending the service life of the equipment. In addition, the system has high energy utilization efficiency, no high energy consumption in low-temperature refrigeration, and low operating cost, making it the most cost-effective nitrogen production system for most industrial and commercial scenarios.