Why should impurities be removed in the air separation process?

As the air cools, the frozen water and carbon dioxide are deposited in low-temperature heat exchangers, turboexpanders or rectification towers, which will block channels, pipelines and valves; acetylene accumulates in liquid oxygen and has the risk of explosion ;Dust will wear out the running machinery. In order to ensure the long-term stable and reliable operation of the air separation equipment, special purification equipment must be set up to remove these impurities.
How to judge whether the heating regeneration of molecular sieve is complete?
First, it is required that the gas pressure and flow required for heating the molecular sieve meet the requirements of the process. The heating regeneration process can be judged by the regeneration curve. The “peak cold blowing” temperature is an indicator of whether the entire bed has been completely regenerated.

The main characteristics of molecular sieve:

Molecular sieves are synthetic crystalline aluminosilicates, as well as natural ones, commonly known as zeolite. At present, there are mainly A type, X type and Y type.

  • Strong adsorption power and good selective adsorption performance;
  • The degree of dryness is extremely high, and it has good drying ability for high-temperature gas;
  • It has good stability and can maintain normal adsorption capacity below 200°C. The service life of molecular sieve is relatively long.

  • Molecular sieve has a strong water absorption capacity, followed by acetylene and carbon dioxide.

What are the types of air pre-cooling systems?

1. Air cooling tower with low-temperature water; 2. Low-temperature water indirect cooling system 3. Direct heat exchange system between air and chiller; 4. Polluted nitrogen evaporative cooling system; 5. Direct cooling with an aftercooler.

What is oxygen emission rate?
Answer: Refers to the proportion of oxygen (gas and liquid) produced by the oxygen generator that is not used and vented. Oxygen emission rate is an important indicator of the adaptability of reaction equipment and the level of production organization. The higher the oxygen emission rate, the more energy waste and the worse the overall economic benefits. Therefore, the oxygen emission rate must be reduced by various means.