Hangzhou air separation equipment manufacturing Co., Ltd. is based on pressure swing adsorption principle, the use of high quality carbon molecular sieve as an adsorbent, under a certain pressure, the production of nitrogen from the air. After purification of dry compressed air, the pressure of adsorption and desorption in vacuum adsorber. Due to the aerodynamic effect, oxygen diffusion rate in the carbon molecular sieve is much larger than that of nitrogen, and the oxygen is preferentially adsorbed by the carbon molecular sieve, and nitrogen is enriched in the gas phase. And then the pressure was reduced to normal pressure, and the adsorbent was attached to the oxygen and other impurities. General settings in the system of two adsorption towers, one tower of nitrogen adsorption capacity, the other tower desorption regeneration, through the PLC program controller to control gas valve opening and closing, so that the two towers cycle, in order to achieve continuous production of high-quality nitrogen purposes. The whole system consists of the following components: compressed air purification module, air storage tank, oxygen nitrogen separation device, nitrogen buffer tank.