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Air is drawn from atmosphere through Suction Air Filter. (1).Air is drawn from atmosphere through Suction Air Filter to prevent dust from getting into the system. |
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The
air is then compressed in a four stage Air Compressor
(2) with after cooler (3) mounted on the process skid
to a maximum pressure of 45-50 Kgs./Cm2 for plant
starting conditions and a pressure of 38 – 40
Kgs./Cm2 for best results normal running conditions. Depending on ambient conditions and good operations the operating pressure of the Air Separations Unit is brought down to 40 Kg/Cm2 as per past experience. Air Compressor has inter-coolers between stages and an After-Cooler after 4th stage. For further details on Air Compressor, please refer to Air Compressor Manual supplied by the Air Compressor manufacturer . The air compressor should be maintained properly in good condition as it is the main source of air supply to the plant. |
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AIR COMPRESSOR
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PROCESS
SKID This consists of the following items: After cooler with Tank Nitrogen Cooler with Tank Moisture Separator (PURGER) Chilling Unit with Fream Unit Oil Absorber filled with Alumina Molecular Sieve Battery on skid Defrost Heater Gas / Air Lines as per standard Layout on skid/platform. |
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All the
above equipments are neatly mounted on a skid/ platform
complete with interconnecting piping and ready for
installation. |
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The air then enters
into cascade an Evaporating Cooler (5) on the process
skid where it gets cooled to about 20 Deg.C. This
unit is optional. The cooler is a cubical vessel where,
there is pipe coil and is inter connected. The coils
are half submerged in water in the vessel Dry Nitrogen
will be bubbled through this water to become wet gas.
As the water vaporizes, it requires latent heat which
is absorbed from water itself. So, water gets cooled.
Thus, air inside the pipe coil will get cooled. Compressed
air, cooled in evaporation cooler will enter into a Moisture Separator |
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Moisture condensed as water will
be separated and drained once in an hour. It is important
to drain moisture from the bottom of the Oil Absorber
(9) at regular intervals and also change the Alumina
every 6 to 12 months. After this the air will pass
through an additional cooler called Chilling Unit
(7). |
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After this the air will pass
through Oil Adsorber. (9) Packed with Alumina balls.
Here the Oil Vapor carried over from Air Compressor
will be removed. If this oil vapor is not removed
sufficiently, due to spent carbon or due to high temperature
of process air, the oil vapor will damage the Molecular
Sieves. To obtain a long life of Molecular Sieve ensure the Alumina is well maintained. |
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| Caution: Check any discoloration of alumina every three months. Ensure that oil and moisture is drained minute is set correctly as per the manual supplied by the air compressor manufacturer and no access oil is sent to the cylinder by the lubricator. | |||||||||||
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