220Nm3/h High Quality PSA Nitrogen Genrator for SMT Industry,
Purity of 99.5%
Taking the clean compressed air as raw material and carbon
molecular sieve as adsorbent, PSA nitrogen generation is a new
technology of nitrogen which adopts the pressure swing adsorption
principle to obtain the nitrogen with purity of 98% to 99.99%.
Under the principle, the carbon molecular sieve full of micropore
would selectively adsorb the gas molecules.Carbon molecular sieve
is made through a series of processing, molding and sintering after
grinding the hard coal. The crystal particle of the activated
carbon molecular sieve has countless microporous caves after
molding. Diameter of the cave is controlled between oxygen
molecules and nitrogen molecules. (Note: the diameter of oxygen
molecules is smaller than nitrogen molecules).
The gas molecules with diameter less than that of the cave can
enter the cave, while those molecules whose diameter larger than
the cave will be obstructed outside the cave. The cave plays a role
of sieving the molecules. A large number of molecular sieve piles
up in the adsorption tower. At the beginning of operation, the air
pressure in the adsorption tower is atmospheric (i.e. gauge
pressure is 0MPa); when the air of 0.7 to 0.8MPa pressure enters
into the carbon molecular bed, the partial pressure of oxygen in
the molecular sieve cave (Note: air pressure consists of the
partial pressure of various gases; the air pressure is higher, the
partial pressure of the corresponding gas is higher) has pressure
difference with that outside the cave, therefore, oxygen molecules
outside has the trend to enter into the molecular sieve cave. With
the promotion of this force, lots of oxygen molecules can rapidly
enter into the cave. (Note: the bigger the pressure difference is,
the more quickly oxygen molecules enter into the molecular sieve
cave.) Large amounts of oxygen molecules enter into the molecular
sieve cave. While the nitrogen molecules cannot enter because their
diameter is greater than that of the molecular sieve cave. The
nitrogen molecules concentrate in the gas phase outside the
molecular sieve, thus separating nitrogen and oxygen from the air.
Because the molecular sieve cave has a certain volume, more and
more oxygen molecules enter into the molecular sieve after the
adsorption tower works for a certain time, and the oxygen partial
pressure inside the molecular sieve cave is higher and higher. When
the oxygen partial pressure inside and outside the molecular sieve
cave is equal, oxygen has no flow trend and it only freely expands
inside and outside the molecular sieve cave, which is the
saturation for molecular sieve’s oxygen -adsorption. (The maximum
oxygen-adsorption capacity of carbon molecular sieve increases with
the adsorption pressure rises and vice versa. So the adsorption
pressure should be controlled in a higher range of pressure, which
normally is 0.7 ~ 0.8MPa, to achieve better adsorption effect).
When the adsorption of the molecular sieve in the adsorption tower
reaches saturation, oxygen molecules inside the molecular sieve
cave shall be emitted for preparation of the next operation.
After the end of the operation when the exhaust gas is emitted by
the adsorption tower, the average pressure of the carbon molecular
sieve layer drops from 0.3 ~ 0.6MPa to normal pressure. The oxygen
partial pressure inside the carbon molecular sieve cave is greater
than that of the external, and the oxygen flows outward from the
cave, releasing the adsorbed oxygen molecules from the molecular
sieve cave. That’s all for the PSA nitrogen generation process.
Nitrogen flow: 0-2,000Nm3/h O2: ≤1ppm Dew point: ≤-70℃ Nitrogen
purity: 99.99%-99.999%
Application
Using before the seal-capping, tank-pressuring, blowing of the
beer, grape wine, fruit wine, edible oil, thus can wipe off the
oxygen and prevent the oxidation, decomposition and color fading of
the no carbonated drinks and edible oil. If cork is used, the
mildew will be prevented in the bottle and the nitrogen purity is
over 99%.
Prevent fried-popping food from becoming soft and stale and crushed
during the transportation.
Add the preservation time of baked food by 3 to 5 months.
Prevent the agglomeration of milk powder, soybean powder during the
long term storage.
Technological Advantages
Close Air Handling System;
Special Low Shunt and Non-Wear Soft Clamping Device.
endif]>Long-life Pneumatic Valve
Innovative Low Noise Silencer
Unique Touch Switch and Liquid Crystal Display
endif]>High Automation and Can be Unattended
Equipment Structure Compact and Reasonable
Produce Nitrogen Fast in Short Time