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

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

Precautions for pearlite filling in air separation unit

1. Before filling with pearlite, the water accumulated on the foundation surface of air separation unit must be removed, dried with hot air, and all manholes shall be closed. 2. When filling pearlite, all containers and pipes in the cold box should be inflated and kept at 50kPa pressure, then slightly open the valve of each meter pipeline, and all thermometers should be electrified to check whether the thermometer cable is damaged during the filling process. 3. The filled pearlite shall not be mixed with combustibles. 4. When filling with pearlite, coarse mesh or pearlite pouring device should be set at the manhole on the top of the cold box to prevent whole bag pearlite from entering the cold box. 5. After the pearlite is filled, the manhole shall be sealed.

Aug 18, 2026