当前位置: Home / Faq / Large air separation FAQ /

How the operation of molecular sieve purification system affects the operation cycle of air separation unit

How the operation of molecular sieve purification system affects the operation cycle of air separation unit
Dec 11, 2020
Author: DEAR AST
Question Reply

The plant operation cycle between two large heating is related to many factors. From an operational point of view, this mainly depends on when the air passage of the main heat exchanger is blocked. The main reason for the blockage is that the moisture and carbon dioxide content in the air entering the unit exceeds the standard, which accumulates and freezes in the main heat exchanger until it is blocked.

 

The abnormal operation of molecular sieve purification system will shorten the operation cycle of the unit. It is mainly caused by the following reasons:

 

1.The molecular sieve adsorption bed is short circuited. In the process of operation, due to the unstable gas velocity control or switching, the pressure difference between the two tanks is too large, which will affect the bedlayer, make the molecular sieve bed uneven and make the bed layer short circuit. In serious cases, the dust screen of the adsorber will break and the molecular sieve powder will enter the heat exchanger channel, causing blockage;

 

2.Spray cooling columnwith water. The air velocity passing through the spray cooling columnis too high, which causes the water mist to enter the adsorber, thus greatly increasing the load of the adsorber to remove the water. The moisture and carbon dioxide content in the outlet air exceeds the standard and is taken into the main heat exchanger and frozen, increasing the resistance. If the resistance in the cold part increases, the carbon dioxide freezes. If the resistance of the hot part increases, the moisture freezes. The resistance of the whole heat exchanger increases, and they are frozen or the molecular sieve powder is blocked.

 

3.The chiller works abnormally, which leads to the cold water temperature rising and the air cannot be cooled to normal temperature. On the one hand, the amount of saturated water in the air from the spray columnincreases; on the other hand, the adsorption capacity of the molecular sieve decreases.

 

4.if the spray columnis cut off or the water level is too high, the temperature of the molecular sieve adsorber will increase or cause the water ladenaccident.

DEAR Air Separation Solve YourHow the operation of molecular sieve purification system affects the operation cycle of air separation unitYou can also learn about otherLarge air separation FAQ about DEAR Air Separation, and solve the problem for you.
Didn’t find the problem encountered?
Please contact live chat or email for quick help.
Related FAQ
More Related FAQ
What precautions should be taken when designing a complete set of air separation equipment?
2024.11.22
In case of sudden power failure during the operation of small air separation unit, the following steps should be followed:   First, open the vent valve (anti surge valve) of air compressor to prevent the air compressor from surging and causing the air compressor to reverse due to air backflow;   Then check whether the molecular sieve adsorber switch should be interlocked to close, if not, it should be man...
2024.11.21
Need more information?
Contact us for more details about our air separation equipment, solutions and services.
Products
  • Large air separation
  • Small air separation
  • High purity nitrogen air separation
  • Liquefaction air separation
  • Complete air separation
  • Biogas purification
  • Air separation parts
Need more information?
Tel:+86-19837850537
© Kaifeng DEAR Air Separation Industry Co., Ltd.. All rights reserved.
Online
Inquiry
Email
Top