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DB Series Nitrogen Generator DB5-20 Model
1. Description
Parker Balston DB Series Twin Tower Nitrogen Generators operate on the Pressure Swing Adsorption
(PSA) process to produce a continuous stream of nitrogen gas from clean dry compressed air.
Pressure Swing Adsorption (PSA) technology uses 2 vessels (or 2 sets of vessels) each filled with
carbon molecular sieve (CMS). One bed is “online” and generating nitrogen from the process air,
while the other bed is “offline” being regenerated.
Nitrogen is “generated” by taking clean, dry particulate free compressed air and flowing up through
the online bed of CMS. Oxygen and other trace gases are preferentially adsorbed by the CMS,
allowing nitrogen to pass through.
The “offline” bed of CMS is regenerated by releasing the pressure in one the vessels and venting
the waste gases to atmosphere, while the other vessel(s) continues to separate air and deliver
a continuous supply of nitrogen.
This process is called pressure swing adsorption because the operating pressure “swings” from
atmospheric pressure to line pressure to adsorb oxygen and from line pressure to atmospheric
pressure to desorb and release the waste gases.
A nitrogen buffer tank is supplied with the generator to aid in providing a consistent supply of nitrogen
with constant flow, pressure, and purity. This is not a nitrogen storage tank.
With the appropriate combination of compressed air purification equipment installed and properly
maintained, a PSA nitrogen generator can continuously provide clean, dry nitrogen gas with purities
up to 99.999% (10 ppm remaining oxygen content) and dewpoints down to -58°F atmospheric.
Each DB 5-20 nitrogen generator is fitted with a high efficiency pre-filter, which removes inlet air
particles down to 0.01 micron. This filter is equipped with an automatic float drain in the event that
any liquids accumulate within the filter housing.
For final filtration, each DB 5-20 generator is equipped with a Parker Balston Grade SA (sterile air)
filter which provides filtration efficiency of 99.9999+% at 0.01μm prior to the nitrogen leaving
the generator.
Nitrogen produced by PSA nitrogen generators contains argon which is also inert.
Therefore, when mentioning nitrogen purities, the composition of the product gas is
determined by the residual oxygen content. For example, 1% oxygen in product gas is
equivalent to 100%-1% = 99% (nitrogen + argon).
The pre-filter is present for final filtration of the incoming air only. The air supplied to the
system should be clean and dry prior to reaching this filter. Any accumulation of water
and/or oil in the pre-filter is an indication of insufficient or poorly maintained compressed
air treatment equipment upstream of the generator. This can lead to contamination of the
CMS which will result in performance degradation. The CMS cannot be regenerated if
contaminated and must be replaced to regain proper performance.
WARNING
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