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Cryogenic Liquid Plants

Cryogenic liquid nitrogen systems/oxygen plants are available in size from 50 m³/hr (70 liter/hour) to 500 cum/hr (700 liters/hour) capacity. It is safe and efficient to operate and the oxygen confirms to North American and European Pharmacopia and standards. The output of LIQUID OXYGEN can be stored in a liquid oxygen tank. Liquid Nitrogen can be available as a by product simultaneously upto 99.999% (PPM GRADE) purity. The plant is extremely versatile and all the possible product variants are possible you can either take 100% Liquid oxygen out put or 50% Liquid oxygen output directly into cylinders or 50% Liquid oxygen and 50% Liquid nitrogen.


Manufacturing Process :

1. Compression Of Atmospheric Air By Air Compressor
In order to consume the free saturated air, an efficient dry-type suction filter is used to suck it from atmosphere into the first stage of the horizontal balanced opposed, lubricated reciprocating air compressor. This compressed air is then chilled to 12°C in a chilling unit at a temperature of 12 degree centigrade to a moisture separator. Prior to its entry into the Molecular Sieve Battery, the condensed moisture is first removed & in order to make air oil free, it is passed through an OIL ABSORBER before this is sent to MOLECULAR SIEVE BATTERY.

2. Purification of Air By Process Skid
Consisting of twin towers, the Molecular Silver Battery operates the packed Molecular Sieves. When chilled air passes through this particular tower, it helps in removing the moisture and Carbon dioxide present in the air. When one of the towers gets regenerated by passing waste Nitrogen gas at 200°C through a reactivation heater, then the other tower is under production which gets exhausted and regenerated by similar process after a gap of 8 to 10 hrs before use. The vicious cycle continues. Before entering the AIR SEPARATION COLUMN, the dust particles gets filtered in the DUST FILTER.

3. Cooling of Air By Expansion Engine (Expander)
The air should be cooled in the air separation unit to temperatures sub-zero (cryogenic) before the liquefication process. After this procedure, its main portion skid enters the expansion engine through the heat exchanger no. I where the air temperature drops to around -165°C by the Expander, which is sophisticatedly designed with Teflon piston rings assorted with hydraulic mechanism with leak proof ball valves.

4. Separation If Liquid Air Into Oxygen And Nitrogen By Air Separation Column
The cold gained from outgoing waste nitrogen & oxygen is used for cooling the chilled, oil free and moisture free air at (-80)°C . This enters into multi-pass HEAT EXCHANGER NO.I while a part of it even enters a multi-pass HEAT EXCHANGER NO. II or LIQUIFIER constructed of special Alloy tubes. The air cools to (-170)°C & prior to its entry into the bottom column & is further cooled, liquefied due to joule Thompson Effect before making its way through an expansion valve. Known as the rich liquid, it later enters into feed tray of top column in the bottom column. While in the top column, POOR LIQUID, a form of liquid nitrogen makes its entry as a reflux. It takes away the latest heat of condensing Oxygen and gets vaporised & on the other hand the liquid Oxygen flows down the trays of the top column into the Condenser passes through a Sub-Cooler to a LO Pump.

5. Compression and withdrawal of liquid and gaseous oxygen for storing in storage tank and cylinder filling




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