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Cryogenic Liquid Plants

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Cryogenic liquid plants are gas plants producing liquid oxygen or liquid nitrogen in the cryogenic process. Cryogenic process is one of the most popular technique used in many large scale gas plants for producing purified oxygen or purified nitrogen. The output of liquid oxygen produced from the plant can be stored in a liquid oxygen tank. Liquid nitrogen is produced as a by product simultaneously upto 99.999% purity. The cryogenic plants are extremely versatile, safe and easy to operate and all the possible product variants that are produced can be taken as either 100% liquid oxygen out put or 50% liquid oxygen output directly into cylinders or 50% liquid nitrogen and 50% liquid oxygen.

What is Cryogenic Liquid?

A refrigerated, severely cold (-60ºC to -270ºC) and pressurized liquid gas. Under different conditions of temperature and pressure, different cryogens become liquids. All cryogenic liquids have two features in common:

They are very very cold.
Small amounts of liquid can grow into very large volumes of gas.

Types of Cryogenic Liquid

Liquid nitrogen
Liquid oxygen
Liquid argon
Liquid helium

Manufacturing Process of Cryogenic Liquid in Cryogenic Plants.

Air is sucked by a multi stage air compressor and air passes through the following process.

Compression of air: This is accomplished by multistage highly efficient air compressor.
Purification of air: Purification of air is dome by an important component of the gas plant known as process skid.
Cooling & liquification of air: A highly efficient expansion engine and a refrigeration unit (for 100% liquid output) are used for cooling and liquification.
Air separation (rectification): Air separation is done in an air separation unit consisting of upper & lower column and special exchangers. The separation air is done by the cryogenic process and the final output whether a liquid oxygen or liquid nitrogen or both goes to the storage tank.

Benefits of Cryogenic Liquid Plants

Besides producing pure liquid oxygen and nitrogen, cryogenic liquid plants are used directly in other processes:

Hydrogen recovery
Hydrogen purification
Liquid petroleum gas (LPG) recovery from refinery off gas
Ethane and ethylene recovery
Purification of carbon monoxide
Nitrogen purification of ammonia syngas
Natural gas processing for recovering NGL and helium

Equipment required in Cryogenic Liquid Plants

Suction filter

Air compressor

Process skid

After cooler with tank
Nitrogen cooler with tank
Moisture separator
Chilling unit
Oil absorber
Molecular sieve battery
Defrost heater
Gas/Air/water line as per standard layout on skid
Water pump
Inlet & outlet water lines

Expansion engine

Air separation unit

Liquid oxygen pump

Cooling tower

Water softener

Buyer's Guide: Technical specifications

Capacity (Product Options):

Oxygen liquid 100%, Nitrogen gas
Oxygen liquid 50%, Oxygen gas 50%, Nitrogen gas
Oxygen gas at 50%, Nitrogen liquid 50%, Nitrogen gas

Purity : Oxygen, nitrogen (optional upto 99.999%)

Power connected

Power consumed (abt.): 50% gas 50% liquid, 100% liquid

Power supply

Air capacity

Starting pressure

Working pressure (abt): 50% gas 50% liquid, 100% liquid

Starting time (after defrost)

Starting time (after tripping)

Areas required

Assembly height

Weight (about)

Air separation column

Tags:- Cryogenic Liquid Plant Exporters, Industrial Cryogenic Liquid Plant

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