Pressure swing adsorption nitrogen production is a process that uses air as the raw material and carbon molecular sieves as adsorbents. By utilizing the selective adsorption properties of carbon molecular sieves for oxygen and nitrogen in the air, the principle of pressure swing adsorption (pressure adsorption, pressure reduction desorption, and regeneration of molecular sieves) is applied to separate oxygen and nitrogen at room temperature to produce nitrogen gas. Pressure swing adsorption for nitrogen production is widely used due to its convenience

The pressure swing adsorption nitrogen generation equipment (air compressor nitrogen generator) mainly consists of a compressed air purification unit, a compressed air buffering unit, an oxygen nitrogen separation unit, a nitrogen buffering unit, and a control unit.

The equipment for preparing nitrogen using pressure swing adsorption in existing technology includes a control system, an air buffer tank, two adsorption towers, a pressure equalization valve, a blowback valve, and a nitrogen buffer tank. The oxygen molecules in compressed air are adsorbed by carbon molecular sieves, and the unadsorbed nitrogen passes through the adsorption bed and enters the nitrogen buffer tank through the left suction valve and nitrogen production valve. This process is called left suction and lasts for several tens of seconds. After the left adsorption process is completed, the left adsorption tower and the right adsorption tower are connected through upper and lower pressure equalization valves to achieve pressure balance between the two towers. This process is called pressure equalization and lasts for 2-3 seconds. After the pressure equalization is completed, the compressed air enters the right adsorption tower through the air inlet valve and the right suction valve. The oxygen molecules in the compressed air are adsorbed by the carbon molecular sieve, and the enriched nitrogen enters the nitrogen storage tank through the right suction valve and the nitrogen production valve. This process is called right suction and lasts for several tens of seconds. At the same time, the oxygen adsorbed by the carbon molecular sieve in the left adsorption tower is released back into the atmosphere through the left exhaust valve, which is called desorption. When the nitrogen generator adsorbs on the left tower, the right tower also desorbs at the same time. In order to completely release the oxygen released from the depressurization of the molecular sieve into the atmosphere, nitrogen is blown out of the adsorption tower through a normally open blowback valve to remove the oxygen inside the tower. This process is called blowback, which occurs simultaneously with desorption. After the right suction is completed, enter the pressure equalization process, then switch to the left suction process and continue cycling.