METHOD OF LIQUEFYING NATURAL GAS IN THROTTLE-EJECTOR CYCLE (VERSIONS) Russian patent published in 2025 - IPC F25J1/00 

FIELD: cryogenic equipment.

SUBSTANCE: invention relates to cryogenic engineering, particularly to liquefaction of natural and other multicomponent gases. Method of liquefying natural gas in throttle-ejector cycle includes cleaning and drying gas, compression in compression unit, mixing with gas backflow, direct flow supply to liquefaction unit, cooling in heat exchangers and evaporator, division into two flows, two flows supply to two ejectors. First flow of steam-liquid mixture after the first ejector is supplied to the first separator where it is separated into liquid and steam; steam from the first separator is supplied to heat exchangers as reverse flow. Larger portion of the reverse flow is directed into a compression unit, mixed with the high-pressure gas to form a circulation loop and fed back into the liquefaction unit. After the first heat exchanger, a smaller portion of steam is supplied either as regeneration gas to a unit for complex cleaning and drying or to a fuel network. Liquid phase from the first separator is throttled to the second separator, vapours from the second separator are pumped out by means of the first ejector. Second flow of steam-liquid mixture after the second ejector is supplied to the second separator, divided into liquid and steam. Liquid from the second separator is throttled, removed from the liquefaction unit and directed to the storage system. Steam from the storage system is returned to the liquefaction unit and directed to the passive flow input of the second ejector. For direct flow cooling liquid cooling agent is supplied from compressor-condenser unit to evaporator, steam-liquid flow of cooling agent is returned back to compressor-condenser unit.

EFFECT: increasing the efficiency of the liquefaction method while simplifying the design.

6 cl, 2 dwg