METHOD FOR LIQUEFYING A NATURAL GAS, INCLUDING A PHASE CHANGE Russian patent published in 2017 - IPC F25J1/02 

FIELD: gas industry.

SUBSTANCE: invention relates to a method and apparatus for liquefying a natural gas in cryogenic heat exchanger (EC1) by indirect contact circulation with flow (S1) of coolant entering in said heat exchanger (EC1) at temperature T0 and at pressure P1. Said coolant is then expanded at cold end (BB) of heat exchanger (EC1) in order to return into a gaseous state at pressure P'1, lower than pressure P1, and at temperature T1, lower than temperature T0, before exiting hot end (AA) of said heat exchanger (EC1) in a gaseous state at temperature T0. Said coolant is then partially liquefied again and conveyed to inlet (AA1) of said exchanger by compression in first compressor (C1), then by a partial condensation in first condenser (H0) and by a phase separation. First liquid phase (d1a) is conveyed at least in part to said first inlet (AA1). First gas phase (d1b) is compressed by second compressor (C1A) and then cooled in desuperheater (DS) by contact with portion (d1c) of said first liquid phase (d1a) at the outlet of said first separator, before condensation in second condenser (H1).

EFFECT: technical result is higher stability and reliability.

15 cl, 5 dwg