PSA nitrogen unit
Nowadays, high-purity PSA nitrogen unit is regarded as one of the most vital targets in industrial gas production field. In petroleum industry, this industrial gas is essential for cleaning, process compressors sealing, and hydrocarbon storage tanks.
Nowadays, high-purity nitrogen generation is regarded as one of the most vital targets in industrial gas production field. In petroleum industry, this industrial gas is essential for cleaning, process compressors sealing, and hydrocarbon storage tanks.
Twin Tower
Nowadays, high-purity PSA nitrogen unit is regarded as one of the most vital targets in industrial gas production field. In petroleum industry, this industrial gas is essential for cleaning, process compressors sealing, and hydrocarbon storage tanks. It also should be mentioned that this conducive gas is applied in the annealing furnaces in the steel industry. Basically, there are two common methods for producing nitrogen.
The first way of manufacture is deep chilling, or so-called cryogenic, which produces liquid nitrogen with an extremely high level of purity.
Pressure Swing Adsorption, the second approach, is a feasible way to generate nitrogen at the consumption site. Two towers packed with carbon molecular Sieves (CMS) are used in PSA technology. Pressurized air enters the first tower through the nozzle located at the bottom of the vessel, and it rises by passing through the CMS bed. By passing adsorbent bed which adsorbs oxygen and other impurities, the generated Nitrogen with the desired purity leaves the adsorption tower through the nozzle located at the top. After reaching the end of the adsorption time, the adsorbent bed will be saturated and the tower enters the regeneration phase. In this step, a ratio of pure nitrogen which called purge ratio comes back to the tower with the aim of removing oxygen from the bed so that the tower is ready for operation again. Finally, one tower is always in operational mode and the other tower is in recovery mode so that the consumer receives the nitrogen flow continuously. The integrated system is illustrated in the figure below
It should be noted that Carbon molecular sieve is different from conventional activated carbons because it has much narrower pores. These adsorbents allow small molecules such as oxygen to penetrate the pores and separate from nitrogen molecules that are too large to enter the CMS. Larger molecules bypass the CMS and appear as gaseous nitrogen. PSA nitrogen generators are typically used in applications requiring greater than 95% purity (5% O2 or less). Today, HAVAYAR industrial group manufactures PSA Nitrogen generators with the wide range of flow rates and purities. The variety of products can handle flow rate of 10 Nm3/hr to 2000 Nm3/hr and a purity level of 95% to 99.9999% in its routine products. In nitrogen generator devices, the inlet air pressure of the device is restricted from 7 to a maximum of 10 bar gauge and these devices have the ability to produce nitrogen from 5 bar g to 8 bar g.
It should be noted that the nitrogen generation process includes the following steps:
- Compression of atmospheric air in the compressor
- Separation of moisture in the air by adsorption or refrigeration dryer
- Filtration
- Nitrogen production in a nitrogen generator
- Storage in the air and nitrogen receiver (one for storing the pressurized air coming out of the compressor and another for Nitrogen storage)
Also, a nitrogen generator consists of the following key components:
- pressurized cylindrical adsorbent vessel
- Adsorbent material (CMS)
- Temperature and pressure sensor and oxygen level analyzer
- Flow control valves
- Control panel
In the field of designing and producing nitrogen packages, the following actions are carried out in HAVAYAR Industrial Group:
- Detailed engineering and design of the package according to the customer’s needs
- Coordinating and determining suppliers based on customer requests
- Inspection and testing of equipment and consumable parts
- Production of all technical documents required for the project
- Holding design, layout, construction, operation and maintenance review meetings
- Pre-startup, start-up and training of the employer’s staffs
The benefits of using the nitrogen generator produced by HAVAYAR
- Taking advantage of the most modern nitrogen production generators based on the state of the art today
- Using high quality CMS with at least 10 years life time.
- 100% automatic operation without the need for an operator
- Having a PLC with the ability to display the percentage of purity, pressure and capacity of produced nitrogen and display the entire process on the touch screen
- Having a zirconium oxide type oxygen analyzer with a long life (no need to replace)
- Minimum energy consumption due to the use of the lowest air factor
- The possibility of adjusting the degree to prevent the exit of nitrogen with a purity lower than the value determined by the cut off system
- Minimum noise pollution
- Ease of maintenance, repair and service
Frequently Asked Questions
Nowadays, high-purity nitrogen generation is regarded as one of the most vital targets in industrial gas production field. In petroleum industry, this industrial gas is essential for cleaning, process compressors sealing, and hydrocarbon storage tanks. It also should be mentioned that this conducive gas is applied in the annealing furnaces in the steel industry.
Basically, there are two common methods for producing nitrogen. The first way of manufacture is deep chilling, or so-called cryogenic, which produces liquid nitrogen with an extremely high level of purity. Pressure Swing Adsorption, the second approach, is a feasible way to generate nitrogen at the consumption site.