The present invention relates to a boil-off gas (BOG) re-liquefaction method for a ship, which re-liquefies BOG generated by naturally vaporizing liquefied gas, and a system using the same. The BOG re-liquefaction method for a ship comprises: a compression step of compressing BOG, discharged from a liquefied gas storage tank, to a pressure required by a high-pressure engine; a cooling step of cooling the high-pressure BOG compressed in the compression step, by exchanging heat between the high-pressure BOG and BOG discharged from the liquefied gas storage tank and transferred to the compression step; a first decompression step of first depressurizing the BOG cooled in the cooling step; and a second decompression step of further decompressing the BOG, decompressed in the first decompression step, to a final target pressure. The first decompression step includes a pressure adjustment step of adjusting the degree of decompression of the BOG in the first decompression step so that the pressure of the BOG transferred from the first decompression step to the second decompression step remains constant. Therefore, a re-liquefaction process can be performed smoothly.

    본 발명은 액화가스가 자연기화하여 생성된 증발가스(BOG; Boil-Off Gas)를 재액화시키는 방법 및 시스템에 관한 것이다. 본 발명에 따른 선박용 증발가스 재액화 방법은, 액화가스 저장탱크로부터 배출되는 증발가스를 고압 엔진에서 요구하는 압력으로 압축하는 압축 단계; 상기 압축 단계에서 압축된 고압 증발가스를, 상기 액화가스 저장탱크로부터 배출되어 압축 단계로 이송되는 증발가스와 열교환시켜 냉각시키는 냉각 단계; 상기 냉각 단계에서 냉각된 증발가스를 1차 감압시키는 1차 감압 단계; 및 상기 1차 감압 단계에서 감압된 증발가스를 최종 목표압력까지 더 감압시키는 2차 감압 단계;를 포함하고, 상기 1차 감압 단계는, 상기 1차 감압 단계에서 상기 2차 감압 단계로 이송되는 증발가스의 압력을 일정하게 유지시키기 위하여, 상기 1차 감압 단계에서의 증발가스의 감압 정도를 조절하는 압력 조절 단계;를 포함한다.


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    Title :

    Boil-Off Gas Reliquefaction Method and System for Vessels


    Additional title:

    선박용 증발가스 재액화 방법 및 시스템


    Contributors:

    Publication date :

    2021-06-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING / F02M Zuführen von Brennstoff-Luft-Gemischen oder deren Bestandteilen bei Brennkraftmaschinen allgemein , SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF / F17C Behälter zum Aufnehmen oder Speichern verdichteter, verflüssigter oder verfestigter Gase , VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES



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