Cryogenic airseparation nitrogen nitrogen is a traditional method, has decades of history. The utility model is characterized in that the air is used as raw material to be compressed and purified, and then the heat exchange is used to liquefy the air into liquid air. Liquid air is mainly a mixture of liquid oxygen and liquid nitrogen, the boiling point of liquid oxygen and liquid nitrogen (in 1 different atmospheric conditions, the boiling point is -183 DEG C, the latter is -196 Deg. C), through the distillation of liquid air, making them separation to get nitrogen. Cryogenic airseparation nitrogen complex equipment, large area, construction cost is higher, more equipment investment, high operation cost, gas production is slow (12 ~ 24h), high installation requirement and long cycle. The factors of integrated equipment, installation and construction, 3500Nm3 / h devices, PSA devices with the same size scale of investment than the cryogenic air separation device of low 20% ~ 50%. Cryogenic air separation nitrogen making device for large-scale industrial production of nitrogen, while the middle and small scale nitrogen is not economic.
