FIELD: cooling.
SUBSTANCE: invention relates to liquefaction of a natural gas stream using a coolant containing methane or a mixture of methane and nitrogen. In methods and systems one uses a contour and a cooling cycle, in which one or more turbine expander is used to expand one or more flows of gaseous cooling agent, in order to obtain one or more gaseous coolant streams which are used to provide cooling capacity for liquefaction and/or pre-cooling of natural gas, and a Joule-Thomson valve for expanding the flow of the liquid or two-phase coolant to a lower pressure to form an evaporating coolant flow which provides cooling capacity for overcooling.
EFFECT: technical result is higher refrigerating capacity of coolant circuit.
25 cl, 2 tbl, 8 dwg
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