... requires air compressor, refrigeration dryer, filters, air tank, nitrogen generator and gas buffer tank. 2, Principle: When the ... and adsorbedin carbon molecular sieve under pressure. Non-adsorbed nitrogen is discharged from outlet of adsorption tower. Oxygen ... Petro-chemicals, Coal-mine, Metallurgy, Pharmacy, SMT, Fire-resistance, lab, Air driving, and so on... 1. Metallurgy: For anneal protection ...