Cryogenic large-scale air separation equipment​ is referred to as "air separation equipment", which uses air as raw material, converts air into liquid state by means of compression cycle deep freezing, and then gradually separates it from liquid air through rectification to produce oxygen, nitrogen and Inert gases such as argon.

In the equipment of oxygen production based on the principle of low-temperature distillation, in order to ensure the normal rectification and separation of air in the low-temperature area, the air must be pretreated in the normal temperature area, such as filtration, precooling and purification. The air contains a lot of dust. During the long-term high-speed operation of the air turbine compressor (hereinafter referred to as the air compressor)