INSTALLATION AND METHOD OF LIQUEFYING NATURAL GAS Russian patent published in 2019 - IPC F25J1/00 

FIELD: gas industry.

SUBSTANCE: invention relates to liquefaction of natural gas and can be used in gas industry. Plant for liquefaction of natural gas includes gas supply pipeline to compressor station, gas outlet from which is connected to a cooler and further to a cryogenic heat exchanger having at least three serially arranged cooling sections. Each cooling section is equipped with output of liquefied hydrocarbons. Output of liquefied hydrocarbons from the first two cooling sections is equipped with an additional branch pipe connected to the expansion device and then to the heat exchange space of the same cooling section having the outlet of the evaporated coolant. Output of liquefied hydrocarbons from the last cooling section is connected to the separator through the expansion device. Third cooling section is equipped with an additional branch of liquefied hydrocarbons connected through an expansion device to a heat exchange space of the same cooling section having the outlet of the evaporated coolant. Output of evaporated coolant after each cooling section is connected to multi-flow heat exchanger along its first heat carrier, outlets of which are connected to stages of compressor station.

EFFECT: technical result is reduction of capital and operating costs.

5 cl, 1 dwg, 1 tbl