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.

The self-cleaning filter generally increases with the increase of gas volume, the number of filter cartridges increases and the number of layers is higher. Generally, it is arranged in two layers above 25000 and three layers above 60000; Generally, a single compressor needs to be arranged with a filter separately and at the upper air outlet at the same time.