PSA nitrogen generator uses air as raw material, carbon molecular sieve as adsorbent, uses the principle of pressure swing adsorption, and uses carbon molecular sieve to selectively adsorb oxygen and nitrogen to separate nitrogen and oxygen, commonly known as PSA nitrogen production. This method is a new nitrogen production technology that was rapidly developed in the seventies. Compared with the traditional nitrogen production method, it has the characteristics of simple process flow, high degree of automation, fast gas production (15~30 minutes), low energy consumption, product purity can be adjusted according to user needs in a large range, convenient operation and maintenance, low operating cost, and strong adaptability of the device, so it is competitive in nitrogen production equipment below 3000Nm3/h, and is more and more popular with small and medium-sized nitrogen users, and PSA nitrogen production has become the preferred method for small and medium-sized nitrogen users.