Disclosed is a boil-off gas reliquefaction system which is capable of increasing performance and efficiency of reliquefaction of boil-off gas even when the temperature of the boil-off gas is relatively high, and which does not require a cooler that pre-cools the boil-off gas for reliquefaction, thereby reducing costs for a reliquefier and increasing reliquefaction efficiency. The boil-off gas reliquefaction system in accordance with one embodiment of the present invention comprises: a storage tank for storing liquefied gas; a compressor for generating fuel gas by compressing the boil-off gas generated in the storage tank; a boil-off gas supply line for supplying the boil-off gas from the storage tank to the compressor; a reliquefier which receives at least a portion of the boil-off gas at the front end of the compressor and causes the boil-off gas to exchange heat with a refrigerant so as to reliquefy the boil-off gas; and a first boil-off gas branch line which is branched from the boil-off gas supply line to the reliquefier and configured to supply the boil-off gas at the front end of the compressor to the reliquefier. The reliquefier is configured to: cause the boil-off gas branched from the front end of the compressor and supplied through the first boil-off gas branch line to primarily exchange heat with the refrigerant; separate the refrigerant heat-exchanged with the boil-off gas into gas and liquid; and cause the gaseous refrigerant and the liquid refrigerant to secondarily exchange heat with the boil-off gas.

    증발가스의 온도가 비교적 높은 경우에도 증발가수의 재액화 성능 및 효율을 높일 수 있으며, 재액화를 위해 증발가스를 선냉각(Precooling)하는 냉각기를 필요로 하지 않아 재액화기의 설비 비용을 줄이고 재액화 효율을 높일 수 있는 증발가스 재액화 시스템이 개시된다. 본 발명의 실시예에 따른 증발가스 재액화 시스템은, 액화가스를 저장하는 저장탱크; 상기 저장탱크에서 발생된 증발가스를 압축하여 연료가스를 생성하는 압축기; 상기 저장탱크로부터 상기 압축기로 상기 증발가스를 공급하는 증발가스 공급라인; 상기 압축기 전단의 증발가스 중의 적어도 일부를 공급받아 냉매와 열교환하여 재액화하는 재액화기; 및 상기 압축기 전단의 증발가스를 상기 재액화기로 공급하도록 상기 증발가스 공급라인으로부터 상기 재액화기로 분기되는 제1 증발가스 분기라인을 포함한다. 상기 재액화기는, 상기 압축기 전단으로부터 분기되어 상기 제1 증발가스 분기라인을 통해 공급되는 증발가스를 상기 냉매와 1차로 열교환시키고; 그리고 상기 증발가스와 열교환된 상기 냉매를 기체와 액체로 분리한 후 기체 상태의 냉매와 액체 상태의 냉매를 상기 증발가스와 2차로 열교환시키도록 구성된다.


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    Title :

    Boil-off gas re-liquefaction system


    Additional title:

    증발가스 재액화 시스템


    Contributors:

    Publication date :

    2021-09-29


    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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