The raw air is compressed and purified by air and enters the fine filter. After spiral, agglutination and surface filtration, most of the liquid water and oil are removed, and then enters the refrigerated dryer. The pressure dew point of the compressed air is reduced to 2 ~ 3℃ by the refrigerant compressor refrigeration system, and a lot of water is removed, and then enters the super-fine filter. Further remove the solid particles contained in the compressed air, so that the compressed air mass reaches 0.01μm, and then enter an activated carbon tank, remove most of the oil, hydrocarbons, etc., and then enter two pressure swing adsorption separation systems filled with adsorbents through the air buffer tank, that is, NGN-110D type nitrogen production unit. Clean compressed air enters from the bottom of the adsorption tower, the air flow diffuses through the air diffuser, evenly enters the adsorption tower, carries out oxygen and nitrogen adsorption separation, and then flows out of the outlet nitrogen, into the nitrogen buffer tank, the nitrogen production process is about 1 minute, after the pressure and pressure reduction (to normal pressure), remove the adsorbed impurity components (mainly oxygen), to complete the regeneration of the adsorbent. The two adsorption towers are operated alternately, and the material air is fed consecutively to produce purity ≥99.9%; Output value ≥110Nm3/h; Pressure 0.6MPa (adjustable); Nitrogen with dew point ≤-40 ° C.

The nitrogen from the nitrogen machine is heated to a certain temperature by the heat exchanger and heater, and then enters the deoxidizer filled with carbon catalyst, the residual oxygen in carbon and nitrogen reacts to generate carbon dioxide and trace water, and then enters the high-efficiency cooler to normal temperature, and then passes through the suction machine filled with molecular sieve to remove carbon dioxide and water, and finally passes through the high-purity nitrogen buffer tank. Fine filter to obtain high purity nitrogen, nitrogen purity ≥99.999%; Output value ≥100Nm3/h; Outlet temperature ≤40℃, pressure 0.5MPa (adjustable) nitrogen atmospheric pressure dew point -70℃.