The production scale of China's air separation equipment has changed from the early stage, which can only produce 20m3 / h (oxygen) oxygen generator. It has developed to the capacity of producing 20000 m3 / h, 30000 m3 / h, 50000 m3 / h and 60000m3 / h large-scale air separation equipment, and has completed the scientific research stage and is about to manufacture 80000m3 / h ultra large-scale air separation equipment.