SYSTEM FOR REPEATED LIQUEFACTION OF STRIPPING GAS AND METHOD OF REMOVAL OF LUBRICATING OIL IN SYSTEM OF REPEATED LIQUEFACTION OF STRIPPING GAS Russian patent published in 2020 - IPC B63B25/16 B63H21/38 F17C9/02 F17C6/00 

FIELD: vessels and other watercrafts.

SUBSTANCE: invention relates to the field of sea transport and concerns a system for repeated liquefaction of boil-off gas (BOG) on ships. Proposed BOG re-liquefaction system comprises: compressor, in which BOG is subjected to compression; a heat exchanger in which compressed with the help of BOG compressor is cooled by heat exchange using BOG removed from storage tank as cooling agent; first valve that controls fluid flow and opening/closing of first feed line, through which BOG to be used in heat exchanger as coolant, supplied to heat exchanger, bypass line, through which BOG is supplied to compressor after bypass of heat exchanger; second valve located at second feed line, through which BOG, used as cooling agent in heat exchanger, is supplied to compressor, wherein said second valve controls fluid flow rate and opening/closing of second feed line; and pressure reducer arranged downstream of heat exchanger and reducing pressure of fluid medium cooled by heat exchanger, wherein said compressor comprises at least one cylinder operating in an oil lubrication mode, and wherein the bypass line is connected to the second feed line after the second valve.

EFFECT: invention ensures efficiency of the system for repeated liquefaction of stripping gas and efficient removal of lubricating oil in this system.

15 cl, 13 dwg