In industrial production, nitrogen, an inert gas with stable chemical properties and colour less, odour less characteristics, is widely used in food preservation, electronics manufacturing, chemical synthesis and other fields. At the core supporting these applications are nitrogen equipment factories. Through sophisticated technologies and processes, they separate and purify nitrogen from air to produce industrial gas that meets the requirements of diverse industries. This article takes you behind the scenes of nitrogen equipment factories from three dimensions: working principles, equipment types and application scenarios.