OSM membrane nitrogen generator with capacity 3000 cfm 95% used for oil and gas purging &blanketing with ASME verified

How does membrane technology work?

Membrane nitrogen generators are based on a simple working principle. The main part of a membrane generator is the membrane module (+- 10cm in diameter), filled with small, hollow polymer fibers. First, dry, clean compressed air enters and due to the structure of these fibers parts of the air will flow to the outside of the fiber. This process is called permeation. During this process, water, oxygen and some of the argon exit through the membrane sides of the fibers. In the end, only nitrogen will remain. This is possible since different molecules permeate at different speeds. H₂O will permeate very quickly, oxygen takes a little longer. Argon and Nitrogen permeate rather slowly, meaning that they will remain in the fibers long after the H₂O and oxygen are gone (some of the Argon will permeate as well, but it would be inefficient to completely remove it from the air stream). Learn more about Nitrogen purity here. Because of the permeation through the fiber wall, an overpressure would occur inside the membrane housing. The fibers would clog and the permeation efficiency would be significantly lowered. To prevent that from happening there is an opening in the housing, the permeate vent, where these 'exhaust' gases (including H₂O, oxygen and Argon) can escape.

Nitrogen purity and requirements for the intake air

It is very important for the intake air to be clean and dry before it enters the membrane. If this is not the case, the shallow fibers will quickly clog. In order to prevent this from happening, correct air treatment of the feed air has to be installed. In some cases the needed filters and dryers will already be built into the generator itself. This would mean that, in some cases, no additional filters should be installed between the compressor and generator. The fibers of the membrane can handle water vapor without much problems. It is however very important that the air doesn't contain liquid water, since this will have a detrimental impact on the membrane. Therefore, it is required for a good water separation solution to be in place upstream the generator, a refrigerant dryer for example. Taking care of the intake air of the generator will protect the membrane and ensure a long lifetime. Take a look at a typical installation below.

Choosing between a Membrane and PSA generator

Since the air factor is generally lower in PSA generators, which results in lower operating costs, you might think that choosing between the two is an easy choice. However, there are some notable advantages to using a membrane generator. The first one being the simpler working principle of membrane generators, this affects maintenance costs and results in a smaller footprint of the installation. They also start up faster and are a lot quieter than PSA generators, who typically have to cope with their blow-off noises at the end of each cycle. This last advantage makes a membrane nitrogen generator more suitable for places in which there are a lot of people working. When selecting the right type of generator, it's wise to look at the application it will be used for and then, considering the total package of (dis)advantages, make a choice.

Following are benefits and features of membrane type nitrogen generators and how they can improve efficiency in a variety of applications.

• An independent onsite supply of nitrogen, which means freedom from the industrial gas supplier and their long-term contracts and ever escalating nitrogen costs
• Fast Return on Investment (ROI); typical ROI can be expected within six to 18 months
• Fully automatic systems for on-demand operation; you only produce nitrogen as required
• Extremely reliable
• Easy, low cost maintenance
• Minimal space requirements
• Membrane type nitrogen generators can be housed in modified sea containers for system mobility or portability
• Eliminate wasteful venting of nitrogen gas that’s associated with bulk liquid nitrogen tanks
• Produces nitrogen purities from 95% to 99.5%; match nitrogen purities to the actual nitrogen purity requirement of your application
• Nitrogen flow capacities are available from 40 SCFH (1 m3/hr) to 200,000 SCFH+ (5,600 m3/hr+)
• Nitrogen discharge pressures to 300 psig (20 barg) without booster compressors
• High pressure systems to 20,000 psig (1,360 bar) available
• Features include touchscreen controllers with the following capabilities:
  • oxygen analyzer
  • air in pressure
  • nitrogen discharge pressure
  • low nitrogen purity alarm
  • low nitrogen pressure alarm
  • maintenance advisory
  • optional purity control setting (up to three purities)
  • optional remote monitoring, controlling and communications capability
  • optional nitrogen flow monitoring
  • optional off spec. gas vent
• Turnkey systems engineered, assembled, and installed to specification

Membrane Nitrogen Generator Applications

Some of the applications that are well-suited for onsite nitrogen generating systems include:

• autoclaves
• beverage manufacturing
• chemical plants and refineries
• coffee packaging
• controlled atmosphere fruit storage
• enhanced oil field recovery
• food/map packaging
• fuel and chemical tank inerting
• gas assist injection molding
• heat treating
• laser cutting
• leak cutting
• pharmaceutical manufacturing
• printing
• power plants
• reflow ovens
• shipboard inerting
• soldering

Advantages of membrane nitrogen plant :

Why Choose Nitrogen Generator Membrane Units:

• Extensive experience producing PSA and membrane units
• All the facilities are ISO 9001 Certified
• Modular design for easy installation
• Systems designed for long-term reliability

• Smallest physical footprint available
• Strategic alliance with dryer and compressor suppliers
• Extensive global service network
• A top-rated membrane when comparing nitrogen/air ratio

Application :

• Aircraft Fuel Tank Inerting
• Agriculture
• Liquid Sparging
• Autoclave
• Bacteria Elimination
• Blanketing
• Carbon Fiber Cutting
• Bio-fuels
• Fire Suppression

Design reference :

Compressed air inlet pressure 9 bar(g)/130 psi(g)

Air quality 1.4.1 according to ISO 8573-1:2010

Nitrogen outlet pressure 7 bar(g)/101psi(g)

Nitrogen quality 1.2.1 according to ISO 8573-1:2010.

Designed working temperature max 50 ℃

Dew point at Nitrogen outlet - 50 ℃

Notes:

Compressed air inlet pressure decide membrane performance

Following request of membrane nitrogen generator will be customized :

Compressed air pressure ＞14 bar(g)/203 psi(g) max up to 24 bar(g)/350 psi(g)

Working pressure ＞24 bar(g)/350 psi(g)

Dew point ＜ - 50 ℃

Movable/containerized , plug and play

Diesel drive

Other special requirements as per site conditions

Sumairui Gas System CO., Ltd located Suzhou High technology district, the company size over 40000 m2, with two more than 8000 m2 modernized standard factories and one 2000 m2 Business office building.

Sumairui Gas devoted in gas equipment research and development, manufacture, sales with service, providing professional gas equipment and service, supply nitrogen generator, oxygen generator, hydrogen generator with other gas drying machine , purification also recovery device. We have obtained ISO, ASME, CE, GOST, SGS, BV, ABS, RINA, LR etc certificates, equipment widely used for over 40 industries field like Oil and gas, Chemical, food, heat treatment, steel, laser, coal mine, Lithium battery, electron, metallurgy, chemical fiber, cable, cooper, pharmaceutical, household,environmental, Tungsten molybdenum, AVIC with military etc . Our equipment had exported to many countries like Russia, Indonesia,, Vietnam, Malaysia, USA, Mexico, Brazil, Bulgaria, Romania, Macedonia etc.

We adheres to supply trustable machine, best service concept, has been committed machine research and development, improving various branches efficiency with service, to return the best service to every customer !

Provided trustable machine and best service for the world !