FIELD: cryogenics.
SUBSTANCE: invention relates to cryogenic equipment. Small-size natural gas liquefaction unit includes section of a gas pipeline, a cryogenic gas machine (CGM), operating at reverse Stirling cycle, heat exchangers freeze-out devices-condensers of natural gas (NG), a cryogenic tank for liquefied natural gas (LNG), gas blower and nitrogen heater. Cooling, cleaning PG from H2O and CO2 and its liquefaction is performed in alternating working heat exchangers freeze-out devices-condensers, cooled by liquid nitrogen, liquefied in CGM and circulating in closed circuit. Part of circulating nitrogen is collected in gas blower with further heating in a heater and is used for heating of heat exchangers with further return of said flow of nitrogen into circulation flow of nitrogen.
EFFECT: technical result is providing prolonged continuous operation.
1 cl, 1 dwg
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