FIELD: machine building.
SUBSTANCE: natural gas liquefaction method, as per which natural gas is cooled, condensed and supercooled as a result of indirect heat exchange with two cooling mixtures circulating in circuits. The first cooling mixture is compressed, cooled and condensed at least partially by heat exchange with external environment (water, air). The first cooling mixture is supercooled as a result of heat exchange so that the first cooling mixture is in liquid phase so that good distribution of cooling mixture can be provided in a series of heat exchangers. Then, the cooling mixture is supercooled in the first heat exchanger by heat exchange with some part of the cooling mixture; with that, the above part is throttled prior to heat exchange. Natural gas is cooled in the second heat exchanger, and at the same time, the second cooling mixture is cooled by heat exchange with the supercooled cooling mixture; with that, the first heat exchanger differs from the second heat exchanger. Then, natural gas is liquefied and supercooled by heat exchange with the second cooling mixture till liquid natural gas is obtained.
EFFECT: use of the invention will allow improving efficiency at lower CO2 emissions.
5 cl, 3 dwg
