 |
|
|
 |
|
 |
| No. 2700-09A |
No. 2700-11A |
No. 2700-12A |
|
 |
 |
Nitrogen Generators
Purity vs. Flow Rates (@100 PSI Inlet feed, 72°F*) |
| Model |
|
Purity |
|
| |
99% |
98% |
97% |
| No. 2700-12A |
7.4CFH |
10.2CFH |
12.5CFH |
| No. 2700-11A |
49.0CFH |
65.0CFH |
75.0CFH |
| No. 2700-09A |
126.0CFH |
180.0CFH |
223.0CFH |
| *Higher flow rates for a given purity can be achieved with high feed pressure and temperature. Contact Terra for information on high-pressure compressors and inline gas heaters. |
|
| Specifications |
| Note:These are typical values for the most common models. Specialized systems can be tailor-made to suit individual applications. |
| Housing: |
Powder-coated white CR steel cabinet with polypropylene leveling feet |
| Feed Air Pressure: |
200 PSIG max. |
| Feed Air Temperature: |
40ºF to 122ºF |
| Nitrogen Outlet Flow: |
See graphs below |
| Prefilter: |
One-micron absolute filtration. Dual glass micro-fiber filter beds coalesce and remove water droplets. Remaining oil content: 1 ppm by weight. Includes slide indicator (to indicate need for filter change), liquid level indicator and internal drain. ISO 8573.1 Quality Class - Solids: Class 2, Oil Content: Class 4 |
| Coalescing Filter: |
Absolute filtration of 0.01µm particles; 99.999=% oil removal efficiency. Includes slide indicator (to indicate need for filter change), liquid level indicator and internal drain ISO 8573.1 Quality Class - Solids: class 1, Oil Content: Class 1 |
| Membrane Module: |
Semipermeable hollow fiber bundles |
| Electrical Requirements: |
Required only for user-supplied-air compressor |
|
| |
| |
Nitrogen Generator
- State-of-the-art membrane separation technology produces dry nitrogen up to 99.9% pure
- Eliminates drawbacks of conventional nitrogen sources—gives you control of rate and purity of nitrogen production
- Delivers gas flows up to 600 SCFH or more depending on nitrogen purity requirements (even higher flows possible if only dryness is desired)
- Compact, lightweight design allows set-up wherever there's a compressed air supply
- Ideal for the complete range of cleanroom applications—from glove boxes to automatic storage systems
- Simplicity of field-proven design ensures completely reliable, economical operation, virtually eliminates maintenance
- Three models available with three flow ranges.
This Nitrogen Generator represents a series of advances by the world leader in hollow-fiber membrane technology used in the first artificial kidney. It gives you complete control of the production of nitrogen for use in a wide range of cleanroom applications—and in most cases quickly pays for itself.
State-of-the-Art and State-of-the-Budget
A nitrogen membrane provides a low-cost, highly efficient means of separating air into its component gases. Because this technology requires no moving parts and consumes relatively little energy, it is surprisingly economical to operate and maintain—the main expense is the energy required to provide a stream of compressed feed air. Each system contains gas pressure control valves and instruments, a coalescing filter and carbon filter (which removes particles and liquid vapors from the feed line), and the nitrogen membrane module.
The membrane module consists of bundles of hollow fiber, semipermeable membranes. Each fiber has a perfectly circular cross-section and a uniform core through its center. The wall thickness of each fiber is thus consistent, which contributes to the physical strength of each membrane. Because the fibers are so small (about the diameter of a human hair), a great many can be packed into a limited space, providing an extremely large membrane surface area that can produce a relatively high volume product stream.
The hollow fibers are assembled parallel to a central core tube, and the bundle is inserted into an outer case to form the air separation module. Compressed air is introduced into the center of the fibers at one end of the module and contacts the membrane as it flows down to fiber bores. Oxygen, water vapor and other "fast gases" pass through the outside of the fibers. The oxygen-rich gas stream then flows through the fiber bundle to the periphery of the case, where it is discharged as a by-product.
While all but a small fraction of the oxygen passes through the membrane material to the exterior of the hollow fibers, most of the nitrogen present in the feed air is contained within the hollow fiber membrane. Since water vapor passes through the membrane along with the oxygen, this nitrogen product is essentially moisture-free. The nitrogen stream emerges at a pressure slightly below that of the feed air pressure.
Design Simplicity Means Easy, Reliable Operation
Because the heart of the system, the membrane module, contains no moving parts, it requires no maintenance. The only attention a system typically needs is an occasional recalibration of the oxygen analyzer and filter change. Even if one module's performance should drop below purity specifications, it can simply be valved off until it can be repaired or replaced
Once the system is set up, you simply switch to START and push the RESET button to open the feed valve. After about three minutes, when gas purity levels are met, a product valve opens to deliver the nitrogen gas to your process line.
Each Nitrogen Generator consists of a membrane module, controls and instrumentation, and coalescing filters and traps to remove oil and liquids, organic contaminants, and other particulates from the feed air. Installation merely requires piping compressed air to the system, piping the nitrogen and oxygen-rich streams to their destinations, and calibrating the system's oxygen analyzer from time to time. Order Terra's oil-less clean air compressor separately.
Nitrogen Membrane (See specification table below) |
| Dimensions |
Uncrated Weight |
Flow Range* |
Cat. # |
$/Each |
18"W x 18D x 81.25"H
(including 1.25" for leveling feet) |
157 lbs. |
0-400 SCFH |
2700-09A |
Login |
24"W x 12"D x 49.25"H
(including 1.25" for leveling feet) |
96 lbs. |
0-100 SCFH |
2700-11A |
Login |
20"W x 12"D x 35.25"H
(including 1.25" for leveling feet) |
58 lbs. |
0-10 SCFH |
2700-12A |
Login |
| * For 99% N2 purity. With 100psi inlet pressure |
Replacement Filter Elements |
| 1-µm Filter |
2700-15 |
Login |
| 0.025µm Coalescing Filter |
2700-16 |
Login |
 |
 |
| |
On-Site
Nitrogen Generation: The Practical, Reliable Alternative |
|
For more and more manufacturers, on-site nitrogen membrane
separation has become a preferable alternative to conventional
sources of purified nitrogen (whether in liquid customer
stations or nitrogen cylinders).
High-volume suppliers of purified nitrogen typically
rely on the cryogenic distillation process, which provides
excellent purity levels (99.99+%) but is energy intensive
and hence inherently expensive. For occasional nitrogen
requirements that demand ultra-high purity, these sources
remain the most economical; but for many other applications—including
most high-volume storage situations—non-cryogenic
generation on-site makes better sense.
Optimal Source of Purge Gas for
Glove Boxes, Desiccators, and Other Enclosures
Membrane systems can be sized to deliver as little as
100 SCFH efficiently and economically, and in most cases
lead to significant savings, even when high purity levels
are necessary.
For nitrogen-purged storage and process systems with
automatic humidity controls (like Terra desiccators,
glove boxes and automated stockers), this purity level
may not even be necessary. Terra systems automatically
regulate the nitrogen purge to maintain the most critical
humidity levels typically required, which can generally
be achieved with purity levels below the 99.99% you
are currently paying for.
Long-Term Stability, Complete
Supply Control
These membrane nitrogen separators provide additional
savings—and greater convenience—by eliminating
the need to rent tanks and pay for delivery services.
Of course, they also free you from price increases on
the part of your nitrogen distributor. Once your system
is installed, you pay only minimal electricity expenses:
your gas costs remain completely predictable.
And your supply remains secure. You'll never need to
worry about overbuying to compensate for tight supplies
or delivery disruptions.
|
|
| |
Complete
Product Control |
|
The purity of nitrogen, flow rate of the gas, and feed
air temperature and pressure all affect the performance
of the membrane separation system. By altering these
variables, you can deliver nitrogen with precisely the
right purity and flow for your applications.
Nitrogen purity can be regulated (up to a maximum of
99.9%) by adjusting the input air pressure and temperature.
In most cases, the greatest system efficiency is achieved
at purities of 95-99%, levels adequate for most cleanroom
applications. See Figure 1.
The flow rate of the enriched nitrogen product is a
function of the purity required. The higher the nitrogen
purity required, the lower the flow rate produced, assuming
constant feed air temperature and pressure. To produce
a higher purity nitrogen product, more oxygen must permeate
the membrane. You increase oxygen permeation by increasing
the pressure difference across the membrane. This transports
more gas, including more of the total oxygen content
of the feed air, through the membrane. With more oxygen
permeating the membrane, the oxygen level in the nitrogen
product gas is reduced and purity improved.
Feed air temperature also affects the performance of
the system. The higher the feed air temperature, the
higher the feed air flow rate required, assuming constant
air pressure and nitrogen purity. As feed air temperature
rises, the membrane permeability increases, requiring
an increased feed air flow rate to maintain product
flow. However, feed air temperature also affects the
membrane material. High feed air temperature shortens
the life of the membrane. See Figure 2 for the relationship
between feed air temperature and flow rate.
When the feed air temperature increases, the feed air
flow required rapidly escalates. Therefore, the system
must be designed to provide required feed air flow rate
of the maximum anticipated feed air temperature, or
an air conditioner must be used to control the feed
air temperature.
Dew point is the temperature at which a given mixture
of water vapor and gas is saturated. The dew point and
trace contaminants of the nitrogen-enriched product
gas are dependent on the water level and quality of
the feed air. Operating in the purity range of 95-99%
nitrogen, saturated feed air results in a product gas
that contains less than 5 ppm water, depending on feed
air conditions. The atmospheric dew point equivalent
is -65°C (-85°F).
Water level in the feed gas is dependent on temperature
and pressure. Therefore, if the feed air pressure is
reduced, the dew point of the product may increase.
If the temperature is increased, the feed dew point
increases and the product stream dew point increases.
Changes in dew point are minimized by using a refrigerated
air dryer to condition the feed air.
Carbon dioxide in the product stream is typically less
than .01% operating at 99% nitrogen, 135 psig and 25°C,
based on feed air containing .03% carbon dioxide.
|
|
| |
|
|
|
