FIELD: oil, gas and coke-chemical industries.
SUBSTANCE: invention relates to liquefaction of a hydrocarbon-enriched fraction, particularly natural gas. Fraction enriched with hydrocarbons is cooled and liquefied in at least two refrigerating cycles. Each refrigerating cycle has at least one circulation compressor. Coldest refrigerating cycle has two series-connected circulation compressors, namely one low-pressure circulating compressor and one high-pressure circulating compressor. With the exception of the high-pressure circulating compressor (C4, C4') in the coldest refrigerating cycle, circulating compressors (C1-C3, C1'-C3') with the same number of revolutions are used, which have a drive from only one gas turbine (GT). Gas turbine (GT) supplies at least 70 %, preferably at least 75 % of required total drive power of all circulation compressors (C1-C4, C1'-C4'). Circulation compressor (C4, C4') of high pressure in the coldest refrigerating cycle is driven by electric motor (M2) or steam turbine.
EFFECT: technical result is improved reliability and compactness and simplified design.
5 cl, 2 dwg
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