Introduction of PSA nitrogen generator

PSA (pressure swing adsorption) is an advanced air separation technology. It remains an irreplaceable part of the field of on-site natural gas supply.

Under the condition of adsorption equilibrium, for any kind of adsorbent, when adsorbing a kind of gas, the higher the air pressure, the greater the adsorption capacity, and vice versa. As shown in the figure below:

As mentioned above, when the air pressure is high, carbon molecular sieve will absorb a lot of oxygen, carbon dioxide and water. When the pressure is reduced to atmospheric pressure, the adsorption capacity of carbon molecular sieve to oxygen, carbon dioxide and water will be reduced.

PSA equipment is composed of two adsorption towers a and B. special carbon molecular sieve and control system are installed. When the clean compressed air enters the inlet of tower a and flows to the outlet through carbon molecular sieve (usually at a pressure of 0.8MPa), carbon molecular sieve absorbs O2, CO2 and H2O, while nitrogen products flow out from the top. Adsorption tower. After a period of time, the adsorption of carbon molecular sieve in tower a reaches saturation. This time, tower a will automatically stop adsorption, and compressed air will flow into Tower B for oxygen adsorption and nitrogen generation, and then regenerate to molecular sieve in tower a.

Regeneration refers to the process of discharging the gas from the adsorption tower into the atmosphere, reducing the pressure to atmospheric pressure rapidly, and then desorbing the oxygen, carbon dioxide and water adsorbed by the molecular sieve from the molecular sieve.

Characteristics of PSA adsorption technology

1. The production purity can be adjusted according to the change of flow;

2. Operation under low pressure and atmospheric pressure, safe and energy saving;

3. Simple equipment structure, convenient maintenance and low operation cost;

4. PLC control, fully automatic and unmanned operation.

Functions of eeto nitrogen generator

Through nearly 30 years of technology accumulation and market application, eeto never stops the pace of R & D and innovation, has always had the most cutting-edge core technology, constantly meets and exceeds customers' expectations, and is committed to providing the most appropriate and comprehensive products. Gas usage solutions for global users.

1. The purity of nitrogen produced by the equipment is 99.9995%. The purity of nitrogen can be adjusted according to the change of flow;

2. The gas consumption is only 60% - 70% of the products of the same industry, with low operation cost and the most energy-saving;

3. Eeto Research Center shall carefully test the adsorbent to improve the utilization efficiency as much as possible;

4. The most stringent adsorbent protection technology, continuous optimization of system technology, to ensure high stability of the equipment;

5. The independent intellectual property control system (H-Tang sys) with PC level operation has 29 functions, such as automatic system equipment, process monitoring, remote local switching, pressure start and stop control, calibration of instruments and sensors, energy saving and load adaptation, etc;

6. Reasonable design, compact structure and minimum floor area;

7. Quick start, gas supply within 30 minutes after start-up.

Basic design conditions

Ambient pressure 68.3kpa

Average temperature 20 ° C

Ultimate maximum temperature 40 ° C

Extreme low temperature 20 ° C

Annual average humidity 75%

Main technical indicators

According to your requirements for eeto nitrogen generator, eeto provides the following products and technical suggestions.

All functions of eeto nitrogen generator

According to the actual needs, users can expand the corresponding functions, and the eeto independent intellectual property control system (H-Tang sys) can achieve all the functions of users.

Technical process description

Pressure swing adsorption (abbreviated as eeto) is a physical process of approximately isothermal change. It uses the difference of adsorption capacity of different components in the gas medium. When the pressure increases, the adsorbent carries out selective adsorption. When the pressure increases, the adsorbent carries out selective adsorption. Reduction, desorption and regeneration of adsorbent. Eeto nitrogen production usually uses two adsorption towers, which are equipped with carbon molecular adsorbent. When one of them adsorbs oxygen to produce nitrogen, the other adsorbs oxygen to desorb and regenerate. This substitution process continues to produce nitrogen.

The components of nitrogen generator include air compressor, compressed air cleaning component, air tank component, PSA oxygen and nitrogen separation component, nitrogen buffer tank component and electrical control system.

The compressed air flows into the buffer tank, passes through the freeze dryer and three-stage filter to remove water, dust and oil, reduces the dew point of the compressed air to the atmospheric dew point below - 20 ° C, and then through the activated carbon, dry and clean compressed air can be obtained.

The clean compressed air flows into the air tank through the ball valve.

The compressed air from the gas tank passes through the throttle valve. Under a certain pressure and time interval, it alternately enters the adsorption tower a and B. the oxygen with small diameter is preferentially adsorbed by the carbon molecular sieve, and the nitrogen with large diameter is preferentially adsorbed. The flow passes through the top of the adsorption tower and into the nitrogen buffer tank for output through the pipeline pneumatic valve and throttle valve. When one adsorption tower a or B is in the process of nitrogen generation by air intake adsorption and the other adsorption tower B or a is in the process of exhaust desorption regeneration, the regeneration of exhaust desorption is carried out rapidly by opening the pneumatic butterfly valve. The oxygen rich gas adsorbed by molecular sieve is discharged into the atmosphere through muffler, so as to regenerate the carbon molecular sieve. Two adsorption towers alternately adsorb and desorb to continuously generate nitrogen. There is a short process of pressure balance between adsorption and regeneration. The so-called pressure balance is to make the pressure of two adsorption towers equal by opening the pneumatic butterfly valve. The throttle valve is used to control the circulating nitrogen flow to flush the adsorption tower.

The nitrogen produced by the adsorption tower is stored in the nitrogen buffer tank first, and then the dust is removed through the dust remover. Adjust the pressure regulating valve to the set pressure, and then adjust the throttle valve to the set flow output. Use the nitrogen analyzer and flowmeter to test the purity and flow of nitrogen.

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