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Production and operation principle of air separation plant

Production and operation principle of air separation plant
Apr 19, 2021
Author: DEAR AST

Air separation unit is the unit for producing air separation. A device that separates air from oxygen and gases.

 

The operation principle can be divided into the following systems:

 

  1. The power system compresses the air into the unitthrough the air compressor

 

  1. Purification system, the compressed air through the air cooling system, through the contact heat exchange to reduce the temperature, washing

 

The acid substances and harmful impurities in the air are removed by molecular sieve purification system, and the harmful substances such as water, carbon dioxide, acetylene, propylene, propane and nitrous oxide in the air are removed.

 

  1. Refrigeration system, through expansion refrigeration, follow the refrigeration cycle

 

  1. Heat exchange system, through the refrigeration system and heat exchange system, the heat exchanger mainly uses aluminum plate fin heat exchanger

 

The device.

 

  1. Distillation system is the core of air separation plant, which realizes the separation of various gases

 

Separation.

 

  1. Transportation system, produced oxygen and nitrogen and other gases, have various specifications of oxygen and nitrogen compression

 

Conveyor pipe.

 

  1. Liquid storage system, by the tank storage liquid oxygen and liquid nitrogen and other products, with cryogenic liquid pump vaporizer.

 

The air separation unit is such an operation, through the compression cycle deep freezing method to change the air into liquid, and then through distillation and gradually separate from the liquid air to produce oxygen, nitrogen, argon and other inert gases.

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When the amount of processing air is reduced, the rising steam and reflux liquid in the upper column will be reduced, but the reflux ratio will not change. Therefore, the reduction of processing air in a small range will not affect the purity of oxygen and nitrogen, and the reduction of processing air volume will help to reduce the pressure of the upper and lower columns. However, according to the material balance, the production of oxygen and nitrogen will naturally decrease when the amount of processing air is reduced. If the amount of processing air is too small, there will be leakage on the tray. If the heat and mass exchange of the leaked liquid is not sufficient, the purity of oxygen and nitrogen will be greatly affected, and even the normal production can not be realized. Therefore, the minimum allowable load of distillation column is generally specified.
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