SYSTEM FOR PROCESSING BOIL-OFF GAS FOR A MARINE STRUCTURE

摘要

The present invention relates to a boil-off gas treatment system for an offshore structure and a treatment method thereof capable of efficiently using boil-off gas by using most of the boil-off gas as the fuel of a high-pressure natural gas jetting engine of an offshore structure after compressing the boil-off gas discharged from a storage tank, and returning the rest of the boil-off gas to the storage tank after liquefying the boil-off gas with the cold heat of boil-off gas which is newly discharged from the storage tank. The boil-off treatment system for an offshore structure having the storage tank in which the liquefied natural gas is stored and the high-pressure natural gas jetting engine using the boil-off gas as the fuel discharged from the storage tank comprises a boil-off gas compression part for compressing the boil-off gas generated in the storage tank; the high-pressure natural gas jetting engine using the boil-off gas as the fuel compressed by the boil-off gas compression part; a heat exchanger for liquefying some of the boil-off gas which is not supplied to the high-pressure natural gas jetting engine among the boil-off gas; and the storage tank to which the liquefied boil-off gas is returned from the heat exchanger. Provided are the boil-off treatment system for an offshore structure and the boil-off treatment method using the system.