The present invention relates to a boil-off gas reliquefaction system and a vessel having the same. The boil-off gas reliquefaction system comprises: a liquefied gas storage tank; a boil-off gas compressor compressing boil-off gas generated in the liquefied gas storage tank; a liquefaction unit liquefying the boil-off gas by using a mixed refrigerant; and a boil-off gas transfer line bypassing the boil-off gas compressor in the liquefied gas storage tank to transfer the boil-off gas to the liquefaction unit. The liquefaction unit comprises: a reliquefier liquefying the boil-off gas by having the boil-off gas exchange heat with the mixed refrigerant; and a mixed refrigerant compressor which is a screw type using oil for sealing and lubrication and compresses the mixed refrigerant, wherein the mixed refrigerant compressor is operated at a load less than a reference value when the boil-off gas is flowed by the boil-off gas transfer line. According to the present invention, it is possible to improve the liquefaction efficiency in the boil-off gas reliquefaction process using a mixed refrigerant and to prevent oil mixed in the mixed refrigerant from being solidified by heat exchange with low-temperature boil-off gas.

    본 발명은 증발가스 재액화 시스템 및 선박에 관한 것으로서, 액화가스 저장탱크; 상기 액화가스 저장탱크에서 발생한 증발가스를 압축하는 증발가스 압축기; 혼합냉매를 이용하여 상기 증발가스를 액화시키는 액화부; 상기 액화가스 저장탱크에서 상기 증발가스 압축기를 우회하여 상기 액화부로 상기 증발가스를 전달하는 증발가스 전달라인을 포함하며, 상기 액화부는, 상기 증발가스를 상기 혼합냉매와 열교환시켜 액화하는 재액화기; 및 실링 및 윤활을 위해 오일을 사용하는 스크류 타입이고 상기 혼합냉매를 압축하는 혼합냉매 압축기를 포함하고, 상기 혼합냉매 압축기는, 상기 증발가스 전달라인에 의한 상기 증발가스의 유동 시 기준값 이하의 부하로 가동하는 것을 특징으로 한다.


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    Title :

    liquefaction system of boil-off gas and ship having the same


    Additional title:

    증발가스 재액화 시스템 및 선박


    Contributors:
    KWAK JEONG MIN (author) / LIM WON SUB (author) / LEE JIN KWANG (author) / LEE GEUN BO (author)

    Publication date :

    2018-01-03


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / F17C Behälter zum Aufnehmen oder Speichern verdichteter, verflüssigter oder verfestigter Gase , VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES / F25J LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT , Verflüssigen, Verfestigen oder Trennen von Gasen oder Gasgemischen durch Druck- und Kältebehandlung



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