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Nitrogen Generator

Nitrogen generator used in laboratory

1. What is nitrogen generator?
    1.1 Nitrogen generator working principle
    1.2 Parts of nitrogen generator
2. PSA nitrogen generator
    2.1 PSA unit for nitrogen production
    2.2 Advantages of PSA nitrogen generator
3. Types of nitrogen generator
    3.1 Liquid nitrogen generator
    3.2 Small nitrogen generator / portable nitrogen generator
    3.3 Membrane nitrogen generator
    3.4 Cryogenic nitrogen generator
4. How to buy nitrogen generator?

What is nitrogen generator?

Nitrogen generator is a device that uses air as raw material to obtain nitrogen gas by physically separating oxygen and nitrogen. Nitrogen compressor is used in a wide range of applications, such as in the oil and gas industry. In the process of oil and natural gas extraction, nitrogen is an important energy source to protect the process of oil extraction, with high safety performance, strong adaptability, and continuous production. In addition, it can also be used in chemical, metallurgical, coal, rubber and tire, pharmaceutical, electronic, and other industries. Therefore, nitrogen generators can be used in almost all industries.

Nitrogen generator working principle

A. PSA nitrogen

Carbon molecular sieves can adsorb both oxygen and nitrogen from the air. Its adsorption capacity increases with the increase of pressure, and there is no significant difference in the equilibrium adsorption capacity of oxygen and nitrogen at the same pressure. If the adsorption speed is taken into account, the adsorption characteristics of oxygen and nitrogen can be effectively distinguished. The diameter of oxygen molecules is smaller than that of nitrogen molecules, so the diffusion speed is hundreds of times faster than that of nitrogen. The carbon molecular sieve also adsorbs oxygen very quickly. The adsorption of oxygen by carbon molecular sieve reaches more than 90% in about 1 minute while the adsorption of nitrogen is only about 5% at this time. Therefore, at this time, what is adsorbed is largely oxygen, and what is left is largely nitrogen. In this way, the oxygen and nitrogen can be initially separated if the adsorption time is controlled within 1 minute. In other words, adsorption and desorption are achieved by pressure difference. Adsorption occurs when the pressure rises and desorption occurs when the pressure falls. The distinction between oxygen and nitrogen is made by the difference in the rate at which the two are adsorbed, and the time difference between them is achieved by controlling the adsorption time. By keeping the time very short, the oxygen is fully adsorbed and the adsorption process is stopped before the nitrogen has time to adsorb. Thus, variable pressure adsorption nitrogen production should have a change in pressure while controlling the time to less than 1 minute.

B. Cryogenic nitrogen

Cryogenic nitrogen can not only produce nitrogen but also liquid nitrogen, which can meet the process requirements of liquid nitrogen. It can be stored in the liquid nitrogen storage tank. When there is an intermittent load of nitrogen or minor repair of air separation equipment, the liquid nitrogen in the storage tank enters the vaporizer and is heated and sent to the product nitrogen pipeline to meet the demand for nitrogen in the plant. The operation cycle of cryogenic nitrogen production is generally 1 year or more, so backup is generally not considered. Pressure swing adsorption nitrogen can only produce nitrogen and has no backup means, so a single unit cannot guarantee continuous long-cycle operation.

C. Nitrogen membrane

The air is compressed and filtered by the nitrogen compressor and then enters the polymer membrane filter. Due to the different solubility and diffusion coefficients of various gases in the membrane, the relative permeation rates of different gases in the membrane are different. Depending on this characteristic, the various gases can be divided into fast and slow gases.

The gas mixture will be permeated by the pressure difference between the two sides of the membrane for gases first with a relatively fast permeation rate, such as water, hydrogen, helium, hydrogen sulfide, carbon dioxide, etc. These gases will be enriched on the permeate side of the membrane after permeating through the membrane. Gases with relatively slow permeation rates, such as methane, nitrogen, carbon monoxide, and argon, are retained on the permeate side of the membrane and are enriched. These result in the separation of the gas mixture.

Parts of nitrogen generator

A. Compressed air purification components

The compressed air supplied by the air compressor is first passed into the compressed air purification assembly, where most of the oil, water, and dust is removed by the duct filter. Then it is further de-watered by a freeze dryer, de-oiled and de-dusted by a fine filter, and deeply purified by a super fine filter in the immediate aftermath. The purification components ensure the longevity of the carbon molecular sieve.

B. Air storage tank

The purpose of the air storage tank is to buffer and reduce airflow pulsation, reduce system pressure fluctuations, and allow compressed air to pass smoothly through the compressed air purification assembly. This facilitates the full removal of oil and water impurities and reduces the load on the subsequent PSA oxygen and nitrogen separation unit. When the adsorption tower is being switched over, it also provides the PSA oxygen and nitrogen separation device with a large amount of compressed air needed for a rapid pressure increase in a short period of time, so that the pressure in the adsorption tower quickly rises to the working pressure, ensuring reliable and stable operation of the equipment.

C. Oxygen and nitrogen separation device

There are two adsorption towers, A and B, equipped with a special carbon molecular sieve. When clean compressed air enters the inlet end of tower A and flows through the carbon molecular sieve to the outlet end, the O2, CO2, and H2O contained therein are adsorbed and the output nitrogen flows out from the outlet end of the adsorption tower. After a period of time, the carbon molecular sieve in tower A saturates and automatically stops adsorption. Compressed air flows into the B tower for oxygen and nitrogen production, and regenerates the A tower molecular sieve. The regeneration of the molecular sieve is achieved by rapidly dropping the adsorption tower to atmospheric pressure and removing the adsorbed O2, CO2, and H2O. The two towers alternate between adsorption and regeneration to complete oxygen and nitrogen separation and continuous nitrogen output. The above processes are controlled by a programmable logic controller (PLC). When the nitrogen purity at the gas outlet reaches the set value, the PLC program automatically opens the valve and automatically evacuates the unqualified nitrogen to ensure that no unqualified nitrogen will flow to the gas consumption point. The noise is less than 75dBA by using anechoic when the gas is emptied.

D. Nitrogen buffer tank

The nitrogen buffer tank is used to equalize the pressure and purity of the nitrogen separated from the nitrogen-oxygen separation system and to ensure a stable continuous supply of nitrogen. After the adsorption tower has been switched, it will partially charge the gas back to the adsorption tower. On the one hand, it helps the adsorption tower to raise the pressure; on the other hand, it also plays the role of protecting the bed.

PSA nitrogen generator


PSA unit for nitrogen production

Installation requirements of PSA nitrogen generator

a. Choose the site according to the size of the equipment. The distance between the machine and the surrounding equipment should Keep more than 1 meter to facilitate operation and maintenance.

b. The installation site must have good ventilation and less dust.

c. It cannot be installed in a corrosive environment.

d. The muffler, which is the exhaust gas outlet of the nitrogen production unit, can be installed either indoors or outdoors. When the air compressor and nitrogen generator are in the same room, the muffler should be installed outdoors to avoid affecting the nitrogen output. If the nitrogen gas generator is placed in a place with poor ventilation, the muffler should be installed outdoors.

e. If the muffler is installed outdoors, it should have rainproof facilities. Note that its placement height cannot be higher than the exhaust gas outlet, otherwise it will lead to pipeline sewage cannot being discharged and easy to make sewage backflow.

f. To ensure safety, safety voltage electrical components must be effectively connected to the ground wire.

g. The grid voltage should be within ±10% of AC.

Advantages of PSA nitrogen generator

PSA N2 generator

a. Produce high-quality nitrogen gas to meet the requirements of various industries. Pressure swing adsorption nitrogen generator is equipped with a high precision filter to make the nitrogen gas have less than 0.01μm of fine dust particles and less than 0.01 ppm of oil content. Additional devices such as adsorption dryers and sterile filters are available to meet the high requirements of special industries such as liquid crystal displays, quartz oscillators, food, pharmaceuticals, etc.

b. It is a low-cost nitrogen generator. Using clean compressed air as raw material, you can produce nitrogen of various purity levels that meet your requirements without consuming any chemicals. The overall cost is about 10-35% of that of purchasing liquid or gas nitrogen, providing you with significant savings.

c. Advanced unmanned operation. Reliable PLC control for 24-hour automated unmanned operation.

Types of nitrogen generator

Liquid nitrogen generator


Small nitrogen generator / portable nitrogen generator


Membrane nitrogen generator


Cryogenic nitrogen generator


How to buy nitrogen generator?

ANTITECK provide lab equipment, lab consumable, manufacturing equipment in life sciences sector.
If you are interested in our nitrogen generator or have any questions, please write an e-mail to [email protected], we will reply to you as soon as possible.

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