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Plant Layouts Molecular
Plant Layouts Molecular
Molecular Sieve Driers for Air Separation Plant, Oxygen Plant, Nitrogen Plant,
Acetylene Plant The drier valve seats should be in prefect condition and if
the air passes through valve seat both production of plant and regeneration
of driers will-be affected.
IMPORTANT Equipment for Molecular Sieve Driers
for Air Separation Plant, Oxygen Plant, Nitrogen Plant, Acetylene Plant:
The Heater should immediately be shut down either in case of Plant shut down
or Expansion Engine shut down. Otherwise, water and water vapor will be drawn
from evaporation cooler by the Blower and will flood the Heater and the drier
with water.
DRIER CHANGE OVER
When cooling is complete, the regenerated drier is to be lined up, as the other
drier would have become saturated by now. First, the Nitrogen blower is to be
switched off. The Nitrogen valves of regenerated drier are to be closed. Then
the regenerated drier will first be pressurized through pressurizing valve.
The pressuring shouldn't, be sudden and hence not through main air inlet valve.
The Molecular Sieve pallets will get disintegrated soon if pressurizing and
depressurizing is sudden. After pressurizing open air inlet valve completely.
Open air outlet valve gradually, watching the outlet air temperature. This temperature
will initially go up and thereafter will cool--down. Then open the outlet valve
completely. Start closing the outlet valve of the drier on line, taking care
of common air outlet temperature. Then close air outlet and inlet valves of
drier, which was on line tightly.
Depressurize the drier by depressurizing valve. The open the Nitrogen valves
of the drier to be regenerated. Start the Nitrogen Blower. Check flow of the
gas at the regeneration Nitrogen vent. The switch on the drier heater for
starting heating cycle of drier. Check for proper performance of drier heater.
DRIER CHANGEOVER (In Short)
Imagine No.1 drier is ready after regeneration. (In case of No.2 Drier adjusts
the valves given in brackets.)
1. Stop Heater.
2. Close N-5 and N-7. (N-6 & N-8)
3. Close A-9 and open A-7 and A-8
4. Watch P-5 to increase gradually for Y2 an hour. (P-6)
5. When P-5 and P-6 are almost equal, open A-3. (A-4)
6. Close A-:7, A-8 and A-9.
7. Open A-5 slowly watch T-4. (A-6)
8. After 15 minutes on A-5 fully and start Closing A-6 slowly. (A-6,
A-5)
9. After 15 minutes close A-6 and A-4 Completely. (A-5, A-3)
10. Open A-9 and A-8 (A-9, A-7)
11. P-6 will come down (P-5)
12. When P-6 reads minimum, open N-6 & N-8 (P-5, N-5, N-7) Start
heater and check the amperes in each phase To ensure that no heater is burnt.
All Starting Drier Heater and watch T-13.
REPLACEMENT OF MOLECULAR SIEVE FOR NITROGEN
ACETYLENE OXYGEN PLANT:
Molecular Sieve is to be replaced if:
It becomes powder.
If it gets contaminated by oil; or
If it looses its adsorption capacity:
The above will be known by frequent checking of Cold Box Equipments.
To change Molecular Sieve, open the top and bottom flanges of drier vessels.
Remove the filter at the bottom. Collect the old Molecular Sieve, which will
fall down. Clean the filters blow the drier vessel.
Fit the bottom filter. Charge about 3 kgs. of Alumina. Then charges Molecular
Sieve Type 13X, size 1.5 mm., size 1.5 mm. about 90 kegs. The Molecular Sieve
should be sieved and be free of all smaller size particles. It is better to
charge through a long funnel so that Molecular Sieve does not fall with a
force and break. Charging is normally done by hand. When leve1 of Molecular
Sieve is just at the brim of dished end of prier vessel, stop charging. Then
fill up the doomed portion with alumina. Fit the top filter after cleaning.
Contact us
Mr. Bharat (CEO)
ING. L&A. Boschi (India)
Phone: +(91)-(124)-4386250, +(91)-(124)-6519863, ;
(International calls only)
Mobile: +(00)-(91)-9810626301
(International marketing calls only)
Fax:+ (91)-(124)-4386234
Email : info@universalo2.com, info@universalboschi.com
Postal Address: A104/2, Okhla Industrial Area Phase - II,
New Delhi - 110020, India.
