METHOD FOR REPEATED LIQUEFACTION OF STRIPPING GAS FOR LNG-TANKER Russian patent published in 2020 - IPC B63B25/16 B63H21/38 F17C13/00 F17C6/00 F17C9/02 F02B43/00 F02M21/02 

FIELD: technological processes.

SUBSTANCE: invention relates to a method for repeated liquefaction of stripping gas (SG) for LNG-tankers. Stripping gas is compressed, cooling of coolant corresponding to compressed stripping gas used as target product of repeated liquefaction, by means of heat exchange between heat carrier and coolant corresponding to uncompensated stripping gas used as coolant by means of heat exchanger; and expansion of cooled stripping gas. Heat exchanger comprises internal element, in which heat exchange takes place between heat carrier and coolant. Inner element comprises multiple diffusion units. Heat carrier cooling includes dissipation of heat carrier and/or coolant supplied to internal element to preserve characteristics of repeated liquefaction irrespective of change of flow rate of heat carrier and/or coolant. Ratio of the flow rate of the stripping gas used as the target product of repeated liquefaction to the flow rate of the stripping gas used as a coolant for heat exchange during cooling of the heat carrier ranges from 0.42 to 0.72.

EFFECT: as a result, overall efficiency of repeated liquefaction and amount of repeatedly liquefied gas is increased.

19 cl, 24 dwg