Air separator - Dear Air Separation

Air separator

There are two types of air separators, vertical and horizontal. The working principle of vertical air separator is that the mixture gas enters the housing and is cooled by evaporation tube, in which the refrigerant vapor condenses into liquid and remains at the bottom of the housing, while the non-condensable gas is discharged through the air outlet.The high-pressure liquid accumulated at the bottom enters the evaporation tube after being depressurized by the expansion valve, and the steam generated in the evaporation tube returns to the compressor. The working principle of the horizontal air separator is the same as that of the vertical air separator. After throttling pressure drop, the recovered refrigerant is returned from the lower return pipe to the second interlayer for utilization and the vapor generated after evaporation is returned to the compressor.

Faq of Air separator

Pressure test and sealing test of valves in cold box of air separation unit

Pressure test before valve installation 1. In the warranty period, those with the certification and the sealing surface is intact can no longer conduct the strength test alone, but only the air tightness test can be taken before installation. 2. Within the warranty period, it has the certificate, and its sealing surface has defects such as corrosion and damage. After treatment, it must carry out the air tightness test. 3. Outside the warranty period, those with certification and intact sealing surface shall be subject to air tightness test before installation. 4. For valves that need to be degreased and disassembled on site, air tightness test shall be conducted separately before installation. 5. The safety valve shall be sent to the local quality inspection department of the project for verification before the end of installation and commissioning.

Sep 29, 2026

Preparation of high purity nitrogen in air separation plant

In the upper column fractionation, below the liquid air inlet is called the stripping section, and above the liquid air inlet is called the distillation section. The stripping section realizes the separation of oxygen and argon, and the distillation section realizes the separation of oxygen and nitrogen. Because the boiling points of oxygen and argon are relatively close, the separation is difficult. In order to ensure the purity of oxygen, the separation of oxygen in the distillation section is not clean, and argon escapes with oxygen and nitrogen. If high purity nitrogen is to be obtained, argon will condense with oxygen in the distillation section, which will affect the purity of oxygen. In order to ensure the purity of oxygen and obtain high purity nitrogen, it is necessary to extract part of the gas with high argon concentration in the distillation section.

Aug 26, 2026