FIELD: cryogenic engineering, cryogenic gas refrigerating machines operating on the Stirling cycle, principle as well as production and keeping of liquefied gases, for example, natural gas. SUBSTANCE: for gas liquefaction use is made of a system comprising a Stirling cryogenic machine and a liquefaction line. High-pressure natural gas from the gas main gets liquefied in the condenser of the Stirling cryogenic machine and overflows to a heat-insulated vessel for keeping. Preliminarily the natural gas is cooled down as it passes through the throttling valve. Liquid nitrogen of the nitrogen baffle is used for prevention of external heat gains to the vessels. For regeneration of liquid nitrogen in the nitrogen baffle provision is made for a system consisting of the second Stirling cryogenic machine and a closed nitrogen circuit comprising the liquid nitrogen line and the nitrogen gas line. Nitrogen gas from the nitrogen baffle gets liquefied in the condenser of the Stirling cryogenic machine and is fed again to the nitrogen baffle through the Dewer flask, high-pressure valve and check valve. EFFECT: enhanced efficiency of the system, reduced material costs, enhanced safety of operation and reduced environmental contamination. 1 dwg
