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Pressure Swing Adsorption & On-site Nitrogen Gas Generation

  Posted in news on 02th February 2017

On-site nitrogen gas generation technology for manufacturing and processing industries is increasingly recognized as a cost effective alternative of supplying nitrogen gas to industrial applications & processes. Today, the technology used for on-site nitrogen gas separation consists primarily of two key techniques: Hollow-Fiber Membrane and Pressure Swing Adsorption. Hollow-fiber membrane is a relatively efficient method of separating nitrogen gas from other atmospheric gases, however, it has limitations in terms of longevity and the purity of nitrogen it is capable of delivering to downstream applications. On the other hand, Pressure Swing Adsorption (PSA) is a highly effective and robust technology that can be scaled to meet the majority of flow rate requirements. Overall PSA is considered to be a better system of gas generation as it produces cleaner, dryer, better quality gas from a compressed air supply, with a lower dew point and at high purities.

What is nitrogen PSA & how does it work?

PSA is a technique that allows the separation of a gas mixture into its individual components by utilizing a solid molecular sieve as an adsorbent. In the case of nitrogen, the adsorbent used is carbon, to which certain molecules, preferentially adsorb under pressure.

A Carbon Molecular Sieve (CMS) is essentially a bed of small carbon beads or pellets. When a nitrogen purification column, packed with CMS, is pressurized with compressed atmospheric air (mainly consisting of nitrogen, oxygen, carbon dioxide and argon), oxygen, carbon dioxide and moisture are adsorbed by the carbon beads, whereas nitrogen does not. This occurs primarily due to the angstrom size of nitrogen and oxygen based molecules – the CMS pores are exactly the right size to adsorb oxygen and its molecular compounds (such as CO2 & H2O), whereas the nitrogen molecules are too large.

In PSA nitrogen generators, the process primarily consists of a two stage cycle...

Stage 1: Adsorption
Compressed, wet air is fed into the nitrogen purification column under pressure. Oxygen, H2O and CO2 molecules are adsorbed into the porous structure of the CMS whilst nitrogen molecules pass through the column and are collected downstream, in a storage vessel, where it can be fed to applications on demand.

Stage 2: Regeneration
When saturated, the nitrogen purification column undergoes a cycle of decompression, where the pressure is rapidly dissipated by venting adsorbed oxygen, CO2 and H2O molecules to atmosphere, eventually normalizing in preparation for the cycle to repeat.   

This whole process also requires a constant temperature, which should ideally be as close to ambient conditions as possible (20-25 degrees Celsius).


Why choose a Peak i-Flow PSA nitrogen gas generator?

Utilizing the latest gas generation technologies, i-Flow is the best in its class of pressure swing adsorption based nitrogen gas generators. It is a highly cost effective, efficient & reliable solution for supplying nitrogen gas to a broad range of manufacturing and processing applications, such as blanketing, drying, fire prevention, gas flushing, packaging, process inerting, sparging and many more.

A single i-Flow generator can produce over 4000 litres per minute (or 240+ Nm3/hr) of very clean, very dry nitrogen gas, at purities ranging from 5% to 99.9995% (ultra-high purity N2).  It is a modular and scalable solution that can be expanded retrospectively to grow in line with your facility needs. i-Flow is not only capable of meeting broad and varying customer supply requirements, it can also help companies improve manufacturing efficiencies, reduce costs and meet sustainability targets.

Want to find out more about how Peak’s nitrogen gas generation solutions can help maximize your productivity? CONTACT US TODAY.


References:

https://en.wikipedia.org/wiki/Hollow_fiber_membrane
https://en.wikipedia.org/wiki/Pressure_swing_adsorption
https://en.wikipedia.org/wiki/Molecular_sieve
http://www.dictionary.com/browse/angstrom
https://en.wikipedia.org/wiki/Nitrogen_generator

 

 

 

Nitrogen gas generation through Pressure Swing Adsorption

Pressure Swing Adsorption (PSA) with Carbon Molecular Sieve (CMS)

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Savings Calculator

Majority of industries buy nitrogen gas supplies via nitrogen cylinder packs, others meet their needs through liquid nitrogen dewars, micro-bulk tanks or bulk liquid nitrogen delivery. There is a better, more sustainable & safer option. Reduce the cost of nitrogen gas to your organisation & become self-sufficient. Find out how much you can save with a Peak industrial nitrogen generator system.

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*Figures for illustration purposes only & may vary based on specific requirements. Investment cost amortized over typical generator lifespan.

Liquid/Bottled N2

= value EURO

  • 120 000
  • 100 000
  • 80 000
  • 60 000
  • 40 000
  • 20 000

Typical On-site N2 Generator*

= value EURO

  • 120 000
  • 100 000
  • 80 000
  • 60 000
  • 40 000
  • 20 000

i-Flow Generator*

= value EURO

  • 120 000
  • 100 000
  • 80 000
  • 60 000
  • 40 000
  • 20 000

Liquid/Bottled N2

= value EURO

  • Cost of liquid/bottled N2 :value
  • Transport cost : value
  • Lease equipment : value
  • energy cost : value
  • Investment cost : value
  • Service cost : value
  • Environmental Tax : value
  • Total yearly cost : value

Typical On-site N2 Generator*

= value EURO

  • Cost of liquid/bottled N2 :value
  • Transport cost : value
  • Lease equipment : value
  • energy cost : value
  • Investment cost : value
  • Service cost : value
  • Environmental Tax : value
  • Total yearly cost : value

i-Flow Generator*

= value EURO

  • Cost of liquid/bottled N2 :value
  • Transport cost : value
  • Lease equipment : value
  • energy cost : value
  • Investment cost : value
  • Service cost : value
  • Environmental Tax : value
  • Total yearly cost : value
  • liquid/bottled N2Cost of liquid/bottled N2
  • InvestmentInvestment cost
  • TransportTransport cost
  • ServiceService cost
  • LeaseLease equipment
  • EnvironmentalEnvironmental Tax
  • EnergyEnergy cost