Cryogenic Oxygen Plant Manufactures Pure Medical & Industrial Oxygen

06

Dec

Gurpreet Singh

At a cryogenic plant, liquefied oxygen can be produced by combining liquid nitrogen and air at temperatures up to -162 degrees Celsius. Cryogenic oxygen plants are the key equipment for air separation plants. It works on the way from a wide range of pressure, low temperature and high vacuum to crystallization pressure, low temperature and high vacuum.

With high performance of big diameter, large number of low pressure vessels, and strong automation and operation ability, it can realize higher efficiency, higher purity product, lower energy consumption and lower cost.

Oxygen is an absolute necessity for life. It is a colorless, odorless, tasteless and non-toxic gas that makes up about 20 percent of the air we breathe and it is one of the elements found in nature.

Bhartiya Cryogas is top Cryogenic Oxygen plant manufacturer in India. It is also the biggest Cryogenic oxygen supplier in India. It manufactures and supplies cryogenic liquid oxygen/nitrogen plants as a product mix mode. It has a leak-proof stainless steel column and skid mounted version for storage of high purity medical and industrial oxygen.

The company adopts the following manufacturing process to produce cryogenic oxygen

1. Compression of Atmospheric Air By Air Compressor

In this process, the free saturated air is sucked from the atmosphere through a highly efficient dry-type suction filter into the first stage of the horizontal balanced opposed, lubricated reciprocating air compressor. Compressed air is chilled to 12 degree centigrade in a chilling unit at a temperature of 12 degree centigrade and then moved 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.

2. Purification of Air by Process Skid

In the process, chilled air passes through the Molecular Sieve Battery consisting of Twin Towers 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 degree Celsius through a reactivation heater. After an 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 particles get filtered in the DUST FILTER before air enters the AIR SEPARATION COLUMN.

3. Cooling of Air by Expansion Engine (Expander)

In this process air before liquefaction in the air separation unit needs to be cooled to temperatures of sub-zero (cryogenic). The main portion of the air after the process enters the expansion engine through the heat exchanger no. 1 after pre-cooling. The temperature of the air drops to around -165 degree Celsius by the help of Expander. It has a highly efficient advanced design with Teflon piston rings and a fully hydraulic mechanism with leak proof ball valves.

4. Separation If Liquid Air into Oxygen and Nitrogen by Air Separation Column

In the process, Chilled, Oil free and moisture free air enters into multi-pass HEAT EXCHANGER NO.I where it gets cooled to (-80) degree Celsius by cold gained from outgoing waste Nitrogen and Oxygen. A part of air then enters a multi-pass HEAT EXCHANGER NO. II or LIQUIFIER made of special Alloy tubes. This air cools to (-170) degree Celsius before passing through an expansion valve. Due to the Thomson Effect, after the expansion valve, air gets further cooled down and gets liquefied before entering into the bottom column is known as rich liquid.

The rich liquid in the bottom column enters into the feed tray. Similarly the liquid nitrogen called POOR LIQUID enters into top column as a reflux and it takes away the latest heat of condensing Oxygen and gets vaporized whereas the liquid Oxygen flows down the trays of the top column into the Condenser passes through a Sub-Cooler to a LO Pump.

The output of liquid oxygen can be stored in a liquid oxygen tank. Liquid Nitrogen can be available as a byproduct simultaneously up to 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 output or 50% Liquid oxygen output directly into cylinders or 50% Liquid oxygen and 50% Liquid nitrogen.