Disclosed are a boil-off gas reliquefaction system for a ship and an operating method thereof. The boil-off gas reliquefaction system for a ship comprises: a compressor for compressing boil-off gas generated from an onboard storage tank; a heat exchanger for cooling the compressed gas compressed by the compressor; and a refrigerant circulation unit in which a refrigerant that exchanges heat with the compressed gas in the heat exchanger circulates. The refrigerant circulation unit includes: a compander expander in which the refrigerant to be supplied to the heat exchanger is expanded and cooled; a compander compressor connected to the compander expander, driven by receiving the expansion energy of the refrigerant, and for compressing the refrigerant discharged after the heat exchange in the heat exchanger; and an inventory controller for controlling the operation of the refrigerant circulation unit. In a normal operating state of the reliquefaction system, the variable geometry nozzle (VGN) of the compander expander is operated in a fully open state, and is operated using the compression/expansion ratio of the compander compressor and the compander expander as a fixed value. Therefore, the reliquefaction system can be easily controlled and can be operated without a reduction in efficiency.

    선박의 증발가스 재액화 시스템 및 그 운전방법이 개시된다. 본 발명의 선박의 증발가스 재액화 시스템은, 선내 저장탱크로부터 발생하는 증발가스를 압축하는 압축기; 상기 압축기에서 압축된 압축가스가 냉각되는 열교환기; 및 상기 열교환기에서 압축가스와 열교환되는 냉매가 순환하는 냉매순환부;를 포함하는 재액화 시스템에서, 상기 냉매순환부는, 상기 열교환기로 공급될 냉매가 팽창 냉각되는 컴팬더 팽창기; 상기 컴팬더 팽창기에 연결되어 상기 냉매의 팽창에너지를 전달받아 구동되며 상기 열교환기에서 열교환 후 배출되는 냉매를 압축하는 컴팬더 압축기; 및 냉매순환부의 운전을 제어하는 인벤토리 컨트롤러:를 포함하며, 상기 재액화 시스템의 정상 운전 상태에서, 상기 컴팬더 팽창기의 VGN(Variable Geometry Nozzle)을 완전 개방(full open) 상태로 운전하고, 상기 컴팬더 압축기와 컴팬더 팽창기의 압축비/팽창비를 고정값이 되도록 운전하는 것을 특징으로 한다.


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    Title :

    Boil-Off Gas Reliquefaction System for Ship and Operation Method Thereof


    Additional title:

    선박의 증발가스 재액화 시스템 및 그 운전방법


    Contributors:
    KIM SEON JIN (author) / LEE SEUNG CHUL (author) / JUNG HYE MIN (author) / CHOI WON JAE (author) / SHIN HYUN JUN (author) / AHN SUNG IL (author)

    Publication date :

    2022-03-18


    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



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