When oxygen enters the adsorber, when the oxygen in the adsorber reaches a certain amount (pressure reaches a certain degree), the oxygen outlet valve can be opened to release oxygen. After a period of time, the amount of nitrogen adsorbed by molecular sieve increased gradually, the adsorption capacity decreased, and the purity of oxygen produced decreased. The nitrogen adsorbed on the molecular sieve must be pumped out with a vacuum pump, and then the above process is repeated. This method of producing oxygen is also called adsorption. Recently, a small oxygen generator has been developed to produce oxygen by adsorption, which is convenient for home use. Of course, it is also a kind of nitrogen making equipment.

It takes advantage of the fact that nitrogen molecules are larger than oxygen molecules and uses special molecular sieves to separate oxygen from the air. Firstly, the dry air is forced to enter the vacuum adsorber through the molecular sieve by the compressor, and the nitrogen molecules in the air are inhaled by the molecular sieve. The air separation oxygen production system includes air compressor system, air cooling system, water cooling system, molecular sieve purification system, booster expander system, distillation tower system, pressurized gasification system, oxygen system, oxygen compressor system and pressure regulating station system. In order to obtain high purity components.

After the air is cooled to the liquefying temperature, it is sent to the lower tower of the rectifying tower, and the air is mixed with the low-temperature reflux from bottom to top.

Full contact heat transfer, part of the air condensed into liquid. Because oxygen is a non-volatile component, nitrogen is a volatile component, so in the condensation process, the condensed oxygen is more than nitrogen, which improves the purity of nitrogen in the gas. At the same time, the latent heat of condensation should be released during gas condensation to vaporize part of the reflux liquid. Because nitrogen is a volatile component. Therefore, nitrogen evaporates more than oxygen, which improves the purity of oxygen in the liquid. In this way, the gas and the reflux liquid on each tray transfer heat and mass from bottom to top, and the purity of nitrogen in the gas phase increases once after passing through each tray. When the gas reaches the top of the lower tower, most of the oxygen has been condensed into liquid, making the purity of nitrogen in the gas phase reach 99.999%. A part of nitrogen enters the condensing evaporator to condense into liquid nitrogen, which is used as the reflux of the lower tower. At the same time, the liquid oxygen at the bottom of the upper column vaporizes as the rising gas of the upper column, and participates in the upper column distillation.