FIELD: production of nitrogen and liquefaction of natural gas. SUBSTANCE: cryogenic Stirling machine, fractionating tower and heat exchanger for freezing out of moisture and carbon dioxide in the combination system are used as a plant for production of liquid nitrogen. The nitrogen gasification line consists of pipe-lines with liquid and gaseous nitrogen connecting in succession a heat-insulated vessel for liquid nitrogen, high-pressure pump, heat exchanger for liquefaction of natural gas and a gas-filling station. The gas-filling station has a receiver vessel, filling line with pressure-reducing and filling valves, and vessels for gaseous high-pressure nitrogen. The pipe-line for feeding of free air to the plant for nitrogen liquefaction passes through the heat-exchanger used for heating of gaseous nitrogen. The vessel for storage of liquefied natural gas communicates with the liquefaction heat exchanger through a liquefied gas drain line made in the form of a coil-pipe in the vessel gas-containing section. EFFECT: enhanced efficiency of systems and reduced material costs at production of nitrogen and liquefied natural gas. 1 dwg
