FIELD: process engineering.
SUBSTANCE: set of inventions relates to production of liquid nitrogen by air decomposition ay low temperature. Said production of liquid nitrogen by air decomposition ay low temperature is carried put in the system of distillers for decomposition to nitrogen and oxygen including high-pressure column, low-pressure column and high-pressure column refluxer. At least one portion of throttled flow at decreased pressure is forced into high-pressure column refluxer evaporation space. Said system of distillers incorporates extra low-pressure column refluxer, space for liquefaction and space for evaporation. Portion of low-pressure column nitrogen is fed into liquefaction space low-pressure column refluxer to be partially evaporated therein. Fluid is fed from low-pressure column bottom rich in oxygen into low-pressure column refluxer evaporation space.
EFFECT: electric power savings, tolerable hardware costs.
14 cl, 6 dwg
