Oxygen Cryogenic Plant

These Oxygen Cryogenic Plant produce oxygen in gas and liquid forms. Air undergoes filtration and compression using 3-stage centrifugal compressors (100% or 70%). Compressed air is then cooled in a water-cooled aftercooler and further cooled in reversing heat exchangers. In the distillation columns, the cold air is separated into oxygen product and waste nitrogen. An intermediate air stream is diverted to the expansion turbine for refrigeration. Liquid oxygen is extracted from the low-pressure column and stored, while gas oxygen is warmed against incoming air and released at 16 Psia. Waste nitrogen cleans the reversing exchanger passages, is warmed against incoming air, and released. Silica gel traps remove entrained hydrocarbons from the main condenser.

SPECIAL FEATURES OF LIQUID OXYGEN Plant

• Plants use "Oil free" rotary screw /centrifugal oil compressor working between 0.6 to 1.0 mpa.
• Use Aluminum Brazed exchangers and packed columns for high efficiency.
• Turbo expanders (Oil or Air Bearing) for trouble free operation.
• Plants above "500" are supplied with automatic PLC control.
• We provide qualified engineers for supervision, installation and start up of all our plants as well as training of manpower at customers site.
• Very low power consumption with proven performance and zero maintenance required for the machines.
• 100% reliability for oxygen gas quality for industrial & hospital use.
• Liquid purity is high for medical and industrial application.

Basics of cryogenic oxygen production

The basic steps of cryogenic oxygen production are as follows:

1. Air is filtered and compressed by the compressor which sets up the product pressure as per the demand of the customer. How much air will be sucked in will depend on the oxygen demand of the customers.

2. After being compressed in the compressor, the air moves through a heat exchanger where it is cooled by the outgoing cold product gases. Then, the air passes through a pre-filer and air purification unit (APU) for removal of carbon dioxide, vapor, water and hydrocarbons by adsorption or absorption.

3. Once the air is purified, it is cooled in a main heat exchanger where it attains a near-liquid state. Then, the cold air is put in a turbine thus reducing its temperature and pressure which generates refrigeration in the process.

4. Now, the expanded air comes into a distillation column where it gets separated into oxygen-rich liquid at the bottom and nitrogen-rich vapor at the top. Next, the oxygen is moved into a low pressure column for further distillation to produce high-purity oxygen which is stored in a liquid tank or vaporized for delivery. Similarly, nitrogen is liquefied and stored or vaporized as a by-product. However, there is a separate process for extracting argon and other rare gases from the middle of the column.

5. Subsequently, the reheating of the product gases takes place in the main heat exchanger with the help of the incoming air. Afterwards, the product gases are delivered to the customer through cylinders or pipelines.

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