Compressed Gas Technologies Inc.
Since our inception, Compressed Gas Technologies Inc. has established itself as a leading supplier of non-cryogenic nitrogen gas generators throughout North America. Our gas generating systems produce dry gas from a compressed air source; in the quantity you need, at low cost. Compressed Gas Technologies Inc. systems (membrane or PSA) are used in applications ranging from chemical blanketing to food packaging to oil and gas production and much more. We realize the importance of product knowledge and customer service. Our goal is to help you choose the correct nitrogen generator and equipment for your particular applications and needs.
Compressed Gas Technologies Inc. offers a complete line of nitrogen generators (membrane & PSA- Pressure Swing Adsorption) and ancillary products such as nitrogen buffer tanks; nitrogen high pressure boosters; dedicated feed air compressor packages. In addition, Compressed Gas Technologies Inc. also offers a complete range of rental products, financing services including term leasing and a complete range of engineering services including turnkey installations.
At Compressed Gas Technologies Inc. you are guaranteed quality nitrogen generation products backed by unsurpassed service as well as the best warranties in the industry.
Take a few moments to browse our site and learn more about Compressed Gas Technologies Inc. and you will see why we have risen to the pinnacle of our industry.
If you are currently using nitrogen for tank blanketing, drying, product transfer, purging, flushing, inerting, you should then look at your plant's compressed air supply as a source to produce your own nitrogen on-site. This is a simple and reliable way that can save you money and give you more control over your gas use.
What are my Generator Product options?
Generally speaking there are two ways to make nitrogen onsite.
Hollow fiber membrane technology
PSA (Pressure Swing Adsorption) technology
The flow rate and purity will determine which technology is best suited for the application. Below is a brief description of both technologies and what applications they are best suited for.
Membrane technology works by filtering oxygen from the dry compressed air stream via hundreds of thousands of hollow, polymeric fibers each the diameter of a human hair to produce gaseous nitrogen. The purity of the nitrogen (O2 Content) can be adjusted by regulating the volume of air passed through the membrane. Membrane modules can be added as necessary, so it's easy to expand as requirements change.
Membrane nitrogen generators are typically used in applications where the purity requirement is below 99.5% (0.5% O2 of higher).
PSA (Pressure Swing Adsorption) Technology:
PSA technology utilizes two towers which are filled with carbon molecular sieve (CMS). Compressed air enters the bottom of the 'online' tower and flows up through the CMS. Oxygen and other trace gases are preferentially adsorbed by the CMS, allowing nitrogen to pass through. After a pre-set time the on-line tower automatically switches to the regenerative mode, venting contaminants from the CMS. Carbon molecular sieve differs from ordinary activated carbons as it has a much narrower range of pore openings. This allows small molecules such as oxygen to penetrate the pores and separate from nitrogen molecules which are too large to enter the CMS. The larger molecules by-pass the CMS and emerge as nitrogen gas.
PSA nitrogen generators are typically used in applications where the purity requirement is higher than 99.5% (0.5% O2 or below).
How Much Does a Nitrogen Generator Cost?
Typically a nitrogen generator will pay for itself in less than two years assuming the nitrogen is being used continuously (70% utilization factor is a rule of thumb) and the process can tolerate some oxygen. The price of industrial gas varies greatly based on geography (proximity to a nitrogen supply source) and volume (how much nitrogen is used) therefore each case will be different.
Maintenance for Generator Products
As with all equipment, service is required on both membrane and PSA nitrogen generators. Membrane nitrogen generators will require semi-annual filter changes as well as. PSA units will also require semi-annual filter changes. They will also require valve rebuilds every two years as well as muffler changes yearly. Both membrane and PSA units will require their oxygen sensors to be replaced every 2-3 years (on units equipped with this feature).
The Nitrogen generation plant based on the PSA-process (fig. 1) consist of two adsorption towers filled with carbon molecular sieve. Compressed and purified air is passing the adsorption towers. Mainly Oxygen is adsorbed on the carbon molecular sieve and Nitrogen enriched gas is leaving the tower. The Oxygen concentration can be reduced to client required purity levels. During adsorption in one tower the second tower is totally regenerated just by depressurization to ambient pressure. The Oxygen enriched off gas with 30-35 vol.-% Oxygen content is vented to the outside atmosphere. After about one minute adsorption in one adsorption tower the process controller is switching over to the second tower and the first one is regenerated.
Atmospheric air contains essentially 78% nitrogen and 21% oxygen. Ordinary dry compressed air is filtered and passed through a technically advanced bundle of hollow membrane fibers where nitrogen is separated from the feed air by selective permeation. Water vapor and oxygen rapidly permeate safely to the atmosphere, while the nitrogen gas is discharged under pressure into the distribution system. Pressure, flow rate and membrane size/quantity are the main variables that affect nitrogen production. Nitrogen purity (oxygen content) is controlled by throttling the outlet from the membrane bundle(s). At a given pressure and membrane size, increasing the nitrogen flow allows more oxygen to remain in the gas stream, lowering nitrogen purity. Conversely, decreasing nitrogen flow increases purity. For a particular purity, higher air pressure to the membrane gives a higher nitrogen flow rate. Purity ranges of less than 90% to 99.999% are possible. By combining multiple membrane bundles, an infinite number of flow/purity ranges are available to satisfy practically any application that requires nitrogen gas.