当前位置: Home / Faq / Biogas purification FAQ /

What are the functions of the upper and lower towers of the air separation equipment?

What are the functions of the upper and lower towers of the air separation equipment?
Jun 09, 2025
Author: DEAR AST

The lower tower and upper tower in the air separation equipment are the main equipment in the distillation system of the cryogenic oxygen air separation equipment. They work together to complete the task of air separation.
The main function of the lower tower is to perform preliminary separation of air. During the distillation process, the liquid flows through the sieve plate one by one from top to bottom. Due to the effect of the overflow weir, a certain liquid level height will be formed on the tray. When gas passes through the small holes of the sieve plate from bottom to top, it comes into contact with the liquid and generates bubbles, thereby increasing the gas-liquid contact area and enabling effective heat and mass exchange processes. Low boiling point components (such as nitrogen) gradually evaporate into the gas phase, while high boiling point components (such as oxygen) gradually liquefy into the liquid phase. In this way, low boiling point pure nitrogen can be obtained at the top of the lower tower, while high boiling point oxygen rich liquid air components can be obtained at the bottom of the tower.
The main function of the upper tower is to further distill and separate the oxygen rich liquid air sent from the lower tower. During the distillation process in the upper tower, the gas rises along the packed tray through the distributor, while the liquid is evenly distributed on the packing tray from top to bottom through the water separator. The gas and liquid on the surface of the packing are in complete contact for effective heat exchange. The low boiling point oxygen content in the rising gas continues to increase, and a large amount of high boiling point component oxygen is washed down to form reflux liquid. Finally, low boiling point pure nitrogen gas is obtained at the top of the tower, and high boiling point liquid oxygen is obtained at the bottom of the tower.

DEAR Air Separation Solve YourWhat are the functions of the upper and lower towers of the air separation equipment?You can also learn about otherBiogas purification 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
Centrifugal compressor, sometimes suddenly produce strong vibration in the production process, gas medium flow and pressure also appear substantial pulsation, and accompanied by periodic dull "call" sound, as well as airflow fluctuations in the network caused by "huffing" "huffing" strong noise, this phenomenon is known as the centrifugal compressor wheezing conditions in small air separation unit. According to the prod...
2025.09.04
In the air separation unit, low-temperature liquid is transported by centrifugal cryogenic pump. In order to ensure the reliable operation of the equipment, two sets of low-temperature pumps are generally equipped, one for use and one for standby. During normal operation, the main pump runs at full load, and the standby pump is in standby state under low load operation. Since the working medium temperature of cryogenic liquid pump is about -180°C, the working pressure is very high, and the pump body is installed in the cold box. When the pump fails, it is extremely difficult to maintain. Therefore, how to maintain the stable and reliable operation of cryogenic liquid pump is of great significance.
2025.09.03
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