PSA technology (Pressure Swing Adsorption, PSA technology for short): a first intake of gas separation technology to the adsorbent (porous solid matter) of the interior surface of the physical adsorption of gas molecules on the basis of, at the same pressure using an adsorbent The separation of gas is achieved by the characteristics of easy absorption of high-boiling gas, difficulty of absorption of low-boiling gas, increase of adsorption of adsorbed gas under high pressure, and reduction of adsorption of adsorbed gas at low pressure. The process of adsorbing impurities under pressure and desorbing impurities under reduced pressure to regenerate the adsorbent is a pressure swing adsorption cycle.

As shown in the upper right figure, in the case of adsorption equilibrium, when the carbon molecular sieve adsorbs the same gas, the higher the gas pressure, the greater the adsorbent adsorption. Conversely, the lower the pressure, the smaller the amount of adsorption. At the same time, under a certain adsorption pressure, the adsorption of oxygen by the carbon molecular sieve is much higher than the adsorption of nitrogen.

PSA nitrogen production, also known as carbon molecular sieve air separation nitrogen, is the use of this principle, with air as raw material, carbon molecular sieve as adsorbent, the use of pressure swing adsorption principle, the use of carbon molecular sieve selective adsorption of oxygen and nitrogen, Nitrogen and oxygen in the air are separated and nitrogen is produced.

Nitrogen from PSA has simple process flow, high degree of automation, fast gas production (15 to 45 minutes), low energy consumption, high product purity, purity that can be adjusted according to user needs within a wide range, convenient operation and maintenance, and operating costs Lower, device adaptability and other characteristics. With the wide application of medium and small-scale nitrogen users under 3000Nm3/h, PSA nitrogen production has become the preferred method for users of small and medium-sized nitrogen gas.