The coal chemical industry uses a large amount of oxygen, and the amount of oxygen produced by pressure swing adsorption oxygen production is relatively small, and the variety is relatively single, which cannot meet the oxygen flow requirements and nitrogen demand of the coal chemical industry. The cryogenic air separation oxygen production technology is mature, and the purity and supply capacity can be guaranteed. There are many successful cases of air separation oxygen generators with an oxygen production capacity of 60,000Nm3/h or even 100,000Nm3/h, and the oxygen and nitrogen produced are also It is needed in the coal chemical industry and is more suitable than pressure swing adsorption oxygen production in terms of purity, flow rate and energy consumption. In short, the pressure swing adsorption method will be used when the demand is relatively small, the purity requirements are not high, and the product requirements are single.