SYSTEM FOR TREATING A LIQUEFIED GAS OF A SHIP

摘要

Disclosed is a system for treating liquefied gas of a ship equipped with a storage tank for storing liquefied natural gas (LNG), and a main engine and a sub engine using the LNG stored in the storage tank as a fuel. The system for treating liquefied gas comprises: a first stream of boil-off gas which is generated from the LNG in the storage tank and discharged from the storage tank; a second stream of the boil-off gas from the first stream, which is supplied to the engine as the fuel; and a third stream of the boil-off gas from the first stream, which is not supplied to the engine. The first stream is compressed by a compressor and then divided into the second stream and the third stream. The third stream compressed by the compressor exchanges heat with the first stream in a heat exchanger and then is liquefied without use of a re-liquefying device that uses a separate coolant. All the liquefied third stream returns to the storage tank after being decompressed.