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Process Description
Process Description
DETAILED PROCESS
Step 1 :- Air Compressor
The free saturated air is sucked from atmosphere through a highly efficient
dry-type suction filter into the first stage of the horizontally balanced opposed,
lubricated reciprocating air compressor.
Step 2 :- Purification of Air (Process Skid)
This consists of purification of the air by removing moisture, oil traces and
carbon-dioxide in the process air. Compressed air is chilled to 12°C in
a chilling unit and evaporation cooler, compressed air passes through the coils
of the chilling unit at a temperature of 12°C to a moisture separator, where
the condensed moisture gets removed before entering into Molecular Sieve Battery.
Before sending the air to MOLECULAR SIEVE BATTERY, air is passed through an
OIL ABSORBER where air becomes oil free.
Chilled air passes through the Molecular Sieve Battery consisting of Twin Tower
packed with molecular sieves to remove moisture and carbon dioxide present in
the air. Molecular Sieve Battery operates on Twin Tower System, when one tower
is under production the other tower is regenerated by passing waste nitrogen
gas at 200°C through a REACTIVATION HEATER. After interval of 8 to 10 hours,
the tower under production gets exhausted and regenerated by similar process
before use and, thus the cycle continues. Any dust particle gets filtered in
the DUST FILTER before air enters the AIR SEPARATION COLUMN All the equipments
are mounted on process skid.
Step 3 :- Expander (Expansion Engine)
The process air before liquefication in the air separation unit needs to be
cooled to temperatures sub-zero (cryogenic). The main portion of the air after
the process skid enters the expansion engine through the heat exchanger no.
I after pre-cooling. The temperature of the air drops to around -165degC by
the Expander which is a very highly efficient advanced design with Teflon piston
rings and completely hydraulic mechanism with leakproof ball valves.
Rest of air at (-80) deg C from Heat Exchanger No. I enters into a highly efficient
EXPANSION ENGINE, where the air further gets cooled down to (-150) deg
C before entering into bottom column. The liquefied air from both these streams
collected at the
BOTTOM COLUMN is known as
RICH LIQUID.
Step 4 :- Air Separation Unit
After the process skid, the air enters the air separation unit (cold box) where
the air converts into liquid air by deep cooling at cryogenic (low temperatures)
and is separated into liquid oxygen and nitrogen.
Chilled, Oil-free and moisture-free air enters into multi-pass
HEAT EXCHANGER
No. 1 where it gets cooled to (-80) deg C by cold gained from outgoing waste
nitrogen and oxygen. A part of air, this enters a multi-pass
HEAT EXCHANGER
NO. II or LIQUEFIER made of special alloy tubes. This air cools to (-170)
deg C before passing through an expansion valve. Due to Joule Thompson Effect,
after the expansion valve, air gets further cooled down and gets liquefied before
entering into Bottom Column.
The
RICH LIQUID in the
BOTTOM COLUMN enters into feed tray of
top column. Similarly the liquid nitrogen called POOR LIQUID enters into top
column as a reflux & it takes away the latent heat of condensing oxygen
and gets vaporized whereas the liquid oxygen flows down the trays of the TOP
COLUMN into the Condenser. Liquid Oxygen from CONDENSER passes through a
SUB-COOLER
to a
LIQUID OXYGEN PUMP.
Contact us
Mr. Bharat (CEO)
Better Deal Machineries Pvt. Ltd.
UV - 67, Phase - IV, Udyog Vihar, Gurgaon,
Haryana - India - 122001
Phone: +91-124-5519870; +(91)-(124)-4386230
Mobile: +91-9871056668
Fax: +(91)-(124)-4386231
Email: sales@bdmexport.com
