Advanced Oxygen & Nitrogen Generation Technology

A world-leading manufacturer of energy-efficient PSA oxygen generators & nitrogen generators

Principle of PSA nitrogen generator

Pressure Swing Adsorption (PSA) is an advanced gas separation technology. It has an irreplaceable position in the on -site gas supply of today's world.

PSA (Pressure Swing Adsorption) is a physical process of approximate temperature change.It utilizes the different adsorption capacities of different components in the gas medium on the adsorbent. The adsorbent selectively adsorbs when the pressure increases and undergoes desorption regeneration when the pressure decreases. PSA air separation for nitrogen production generally uses two adsorption towers, filled with carbon molecular sieve (CMS) adsorbent. When one adsorption tower is engaged in oxygen absorption and nitrogen production, the other adsorption tower is engaged in deoxygenation regeneration, and nitrogen is continuously produced through alternating cycles.

Under adsorption equilibrium, the higher the gas pressure, the greater the adsorption capacity of any adsorbent when adsorbing the same gas. On the contrary, the lower the pressure, the smaller the adsorption capacity. As shown in the following

As mentioned above, when the air pressure increases, carbon molecular sieves will adsorb a large amount of oxygen, carbon dioxide, and moisture. When the pressure drops to normal pressure, the adsorption capacity of carbon molecular sieve for oxygen, carbon dioxide, and moisture is very small.

The pressure swing adsorption equipment mainly consists of two adsorption towers A and B equipped with carbon molecular sieves (CMS) and a control system. When compressed air passes through Tower A from bottom to top, oxygen, carbon dioxide, and moisture are adsorbed by carbon molecular sieves, while nitrogen is passed through and flows out from the top of the tower. When the molecular sieve in Tower A is saturated, it switches to Tower B for the above adsorption process and simultaneously regenerates the molecular sieve in Tower A. The so-called regeneration refers to the process in which the gas in the adsorption tower is discharged into the atmosphere, causing the pressure to quickly decrease to normal pressure, that from the CMS which releasing the oxygen, carbon dioxide, and moisture.

PSA process flow

The main components of nitrogen generator

PSA nitrogen generator is composed of five parts: A. Compressed Air Purification System, B. Air Tank System, C.O2/N2 Separation System, D. Nitrogen Buffer System, E. Electrical Control System.

Note: As differences in customer requirements leading to different equipment configurations, the above components are for reference only but not as acceptance criteria.

Brief description of process flow

PSA nitrogen-making process is mainly completed by four steps:

Air compressor provides compressed air with certain pressure

1. Fully communicate and confirm customer needs
2. Customized gas supply plan+multi version quotation

Air purification system purifies compressed air by removing the dust, oil and moisture

1. Real-time production progress synchronization
2. Comprehensive factory inspection
3. Professional installation guidance
4. Full-system debugging + on-site testing
5. Tiered Practical Training Services

Oxygen and nitrogen separation system produce qualified nitrogen gas through PSA technology

1. The entire equipment is covered by a warranty period of no less than 12 months
2. Remote technical support via phone or WeChat provides rapid response within 1–2 hours
3. Local engineers provide on-site emergency repairs 24 hours a day.
4. For domestic customers, a free comprehensive on-site inspection will be conducted every 6 months during the warranty period.
5. Common spare parts inventory

Nitrogen buffer system provides a stable source for follow-up equipment by the storage of nitrogen gas.

Air compressor compress the air through the consumption of electricity , for providing stable and sustainable raw materials for follow-up of oxygen and nitrogen separation system.

Compressed air enters the air purification systems from compressor. The role of air-purification system is to remove dust, oil and moisure by the three filters, freezing drier, and effective oil-removal. Oil-removal which is to protect the core component of nitrogen machine---CMS, to avoid oil poisoning

（*Notes: CMS Oil poisoning refers to the blockage of micropores on the surface of CMS by oil molecules, resulting in the inability to adsorb oxygen and nitrogen molecules, thereby affecting the performance of nitrogen generators.）

Purified compressed air enter the separation of oxygen and nitrogen process, O2/N2 (oxygen and nitrogen) separation system equipped full filling with CMS. The two adsorption towers worked alternatively to provide the stable production to meet the requirements of the user. The O2/N2 separation system sends the generated nitrogen into a nitrogen storage tank. The storage tank can store a certain capacity of qualified nitrogen and provide a stable nitrogen gas source for subsequent nitrogen equipment. The entire system is controlled by PLC, unattended, and automatically operates to ensure the minimum power consumption of electricity under the demand of nitrogen.

Description of various components of the nitrogen generator

PSA nitrogen generator is composed of five parts: Compressed Air Purification System, Air Tank System, O2/N2 Separation System, Nitrogen Gas Buffer System, and Electrical Control System.

Compressed Air Purification System

The function of compressed air purification system is to remove dust, moisture and oil from compressed air. It’s mainly composed of three grade filters, freezing drier and high-efficient oil-removal.

Carbon molecular sieve (CMS) is the core of PSA nitrogen generator. Oil poisoning is one of the main failure forms of CMS. The adsorption of moisture will reduce the adsorption capacity of CMS for oxygen. The compressed air discharged by oil lubricated type air compressors usually contains oil and water, so it is necessary to remove oil and moisture first before the compressed air enters the O2/N2 separation system.

Air buffer system

The function of air storage tank components is to ensure stable gas use of the system. When the oxygen isolation system is switched, the instantaneous air flow rate is prevented from being too fast, affecting the effect of air purification, improving the compressed air quality entered into the adsorbent, and it is conducive to extending the service life of the molecular screen.

Air tank system is composed of air tank, safety valves, closing valves, ball valves, pressure gauges etc.

O2/N₂ Separation System

The O₂/N₂ separation system is the core part of nitrogen generator, which achieves the separation of oxygen and nitrogen through PSA technology to attain the purpose of producing nitrogen.

There are two adsorption towers equipped with dedicated carbon molecular sieves, A and B. When clean compressed air enters the inlet end of Tower A and flows through the carbon molecular sieve towards the outlet end, O2, CO2, and H2O are adsorbed by it, and the product nitrogen flows out from the outlet end of the adsorption tower. After a period of time, the carbon molecular sieve in Tower A is saturated with adsorption. At this point, Tower A automatically stops adsorption, compressed air flows into Tower B for oxygen absorption and nitrogen production, and the molecular sieve of Tower A is regenerated. The regeneration of molecular sieves is achieved by rapidly lowering the adsorption tower to atmospheric pressure to remove adsorbed O2, CO2, and H2O. The two towers alternate for adsorption and regeneration, completing oxygen nitrogen separation and continuously outputting nitrogen.

O2, CO2, and H2O mainly consist of two alternating adsorption towers (filled with CMS) and pipeline pneumatic valves, mufflers, throttle valves, compression cylinders, pressure gauges, etc.

Nitrogen Buffer System

The nitrogen buffer system is used to balance the pressure and purity of nitrogen separated from the nitrogen oxygen separation system, ensuring a continuous supply of nitrogen. At the same time, after switching the operation of the adsorption tower, it will charge some of its own gas back into the adsorption tower, which not only helps to boost the pressure of the adsorption tower, but also protects the bed layer and plays a process auxiliary role in the equipment operation process. The nitrogen buffer system mainly composed of buffer tank, flow meter, dust filter, pressure regulating valve, throttle valve, safety valve, etc.

Electrical Control System

The electrical control system includes a programmable program controller CPU, gas source three connections, solenoid valves, indicator lights, micro-oxygen instruments etc., which are mainly installed in the electrical control cabinet.

The main functions of the electrical control system are: equipment start and stop operation, working status indicator light, fault sound and light alarm indication, purity display, and sound and light alarm, and driving the pneumatic valve according to the set program.

Huilin PSA nitrogen technology advantages

Carbon molecular sieve is tight, sinking automatic alarm system

The unique cylinder pressure device can continue and automatically compact molecular sieves, which is the guarantee of the safe use of molecular sieves. When the molecular sieve is sieved to a certain extent, the alarm will be automatically alarm, and it will be automatically stopped after excessive sinking.

Advanced process process

Multi -layered average pressure process, using the nitrogen -rich gas of the regenerative tower to restore the inherent purity gradient distribution of the bed layer, and the secondary average pressure helps the adsorption tower to increase again, reduce the impact of the gas on the bed, effectively protect the adsorbent of the adsorbent agent. Safety makes the entire process more scientific, efficient and energy -saving. And can produce nitrogen with a purity of 99.999%at a time.

Advanced loading technology, improve adsorption efficiency

The carbon molecule sieve adopts “ snowstorm ” method to load, makes the molecule sieve being distributed evenly and has no dead angle, and difficult in chalking.

Advanced energy -saving control technology

Huilin Patent Control System (Patent Number: ZL2021232570428), automatically extend the adsorption time, slow down the cycle cycle, reduce the amount of gas consumption to the maximum, and reduce energy consumption.

And it is equipped with a universal pressure difference energy-saving device as standard. When the user terminal is not using gas, the system automatically stops, and when the user starts using gas, the system automatically starts.

The mechatronics design realizes the automatic running

Huilin patent control technology has allowed the equipment control system to upgrade from traditional low -end vertical instructions to PC -level application software. The interface is friendly and intuitive. The purity of nitrogen flow pressure can be continuously adjusted and displayed, At the same time, a number of practical functions have been integrated, and strong control and monitoring functions further ensure the reliability and stability of the equipment. Realize the real unmanned operation.

The unqualified nitrogen automatic emptying system

The low purity nitrogen at the initial stage of starting the machine will be automatically emptying, and then supply gas to the working face after reaching its index.

Monitor the purity of nitrogen online, guarantee that the nitrogen required is steady in purity.

The high-quality carbon molecular sieve

Supporting Huilin special carbon molecular sieve. After years of practice, Huilin specialized carbon molecular sieve has reliable performance, stable quality, and a lifespan of over ten years. With the advanced process flow of Huilin, high-purity nitrogen with an oxygen content of less than 3Ppm can be obtained in one production.

The high-quality components and parts are the reliable assurance of steady operation

Select the parts of the well-known brand to ensure the long-term stable operation of the system.

The details are perfect, the overall beauty

The pipeline is made of stainless steel or aluminum alloy, and it will never rust.

Free debug , life-long maintenance

The strong technical strength and high -quality after -sales service provide continuous technical support, and the usage with no worries.

The design, manufacturing, testing, and acceptance of the design, manufacturing, testing and acceptance of Huilin Equipment

Design reference standard

"Design Specification for Compressed Air Stations" GB50029-2003

1. Fully communicate and confirm customer needs
2. Customized gas supply plan+multi version quotation

"Adsorbing Oxygen and Nitrogen Generator" JB/T6427-2001

"Fixed Pressure Vessel" GB 150-2011

"Supervision Regulations for Safety Technology of Pressure Vessels"

Nitrogen buffer system provides a stable source for follow-up equipment by the storage of nitrogen gas.

"Pressure Vessels Non-destructive Test" JB4730-94

"Safety Valve General Requirements" GB/T12241-1989

"Specifications and Tests of Compressed Air Dryer" GB/T10893-1989

"Seamless Steel Tubes for Liquid Service" GB/T8163-1999

"Steel Pipe Flanges, Gaskets, Fasteners" HG20592-2009

"Regulations for the Construction and Acceptance of Industrial Automation Instrument Project" GB50093-2002

"Design Specification of Petroleum Automation Instrument Selection" SH 3005-1999

"Design Specification of Petrochemical Instrument Gas Supply Design" SH 3020-2001

"Design Specification of Petrochemical Instrument Pipeline Line" SH/T 3019-2003

"Code for Ground Design of Petrochemical Instrument" SH/T 3081-2003

"Design Specification of Petrochemical Instrument Power Supply Design" SH/T 3082-2003

"Common Terms for Self-Control Design" HG/T 20699-2000

This product is implemented in accordance with relevant regulations and reference standards during the production, manufacturing and acceptance process.

All pressure vessels are manufactured, tested and accepted according to the GB150-2011 "Fixed Pressure Vessels".

1. Fully communicate and confirm customer needs
2. Customized gas supply plan+multi version quotation

All welded joints of the device are detected in accordance with the welding regulations JB/T4709-2000.

"Common Terms for Self-Control Design" HG/T 20699-2000

All components, pipelines, and joints are tested with gas static pressure test.

The electrical control line is detected according to the GB/T52261-2002.

The appearance protection and paint are detected according to JB/T4711-2003.

Functional detection: Complete equipment manufacturing is finished and debugged on the supplier's site. It’s to be allowed t to leave the factory only all technical indicators (under on-site testing conditions) are tested and qualified.

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Bridge Lei

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HUILIN Co. is a company specializing in the production, research and development, sales and service of PSA oxygen generators and nitrogen generators. The address of HUILIN Company is located in Guangzhou, China.

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