Disclosed is a method to discharge lubricant in a system to reliquefy boil-off gas (BOG), which compresses the BOG by a compressor, cools the BOG through heat exchange with evaporation gas in a heat exchanger before compressing the compressed BOG, and decompresses a heat-exchanged and cooled fluid by a decompression apparatus to prevent or mitigate a phenomenon that condensed or solidified lubricant closes a flow path of the heat exchanger. According to the present invention, the compressor includes at least one lubrication type cylinder, and the lubricant discharge method determines a time point to discharge the condensed or solidified lubricant when one or more conditions are satisfied among a condition of maintaining a state, in which a temperature difference (hereinafter, referred to as a low temperature flow temperature difference) between a temperature of the BOG used as a refrigerant in the heat exchanger at the front end of the heat exchanger and the temperature of the BOG cooled by the heat exchanger after being compressed by the compressor is equal to or greater than a first set value, for a predetermined time or longer, a condition of maintaining a state, in which a temperature difference (hereinafter, referred to as a high temperature flow temperature difference) between the temperature of the BOG used as the refrigerant in the heat exchanger and the temperature of the BOG sent to the heat exchanger after being compressed by the compressor is equal to or greater than the first set value, for a predetermined time or longer, and a condition of maintaining a state, in which a pressure difference (hereinafter, referred to as a high temperature flow path pressure difference) between the pressure of the BOG sent to the heat exchanger being compressed by the compressor at the front end of the heat exchanger and the pressure of the BOG cooled by the heat exchanger at the rear end of the heat exchanger is equal to or greater than a second set value, for a predetermined time or longer.

    증발가스를 압축기에 의해 압축시키고, 압축된 증발가스를 압축되기 전의 증발가스와 열교환기에서 열교환시켜 냉각시키고, 열교환시켜 냉각시킨 유체를 감압장치에 의해 감압시켜, 증발가스를 재액화시키는 시스템 내의 윤활유를 배출시키는 방법이 개시된다. 상기 윤활유 배출 방법에 의하면, 상기 압축기는 급유식 실린더를 적어도 한 개 포함하고, 상기 열교환기에서 냉매로 사용되는 증발가스의 상기 열교환기 전단에서의 온도와, 상기 압축기에 의해 압축된 후 상기 열교환기에 의해 냉각된 증발가스의 온도 차이(이하, '저온 흐름의 온도 차이'라고 한다.)가 제1 설정치 이상인 상태가 일정시간 이상 지속되는 조건; 상기 열교환기에서 냉매로 사용된 증발가스의 온도와, 상기 압축기에 의해 압축된 후 상기 열교환기로 보내지는 증발가스의 온도 차이(이하, '고온 흐름의 온도 차이'라고 한다.)가 제1 설정치 이상인 상태가 일정시간 이상 지속되는 조건; 및 상기 압축기에 의해 압축된 후 상기 열교환기로 보내지는 증발가스의 상기 열교환기 전단에서의 압력과, 상기 열교환기에 의해 냉각된 증발가스의 상기 열교환기 후단에서의 압력 차이(이하, '고온 유로의 압력 차이'라고 한다.)가 제2 설정치 이상인 상태가 일정시간 이상 지속되는 조건; 중 하나 이상을 만족하면, ‘응축 또는 응고된 윤활유를 배출시켜야 할 시점’이라고 판단한다.


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    Titel :

    Boil-Off Gas Reliquefaction System and Method of Discharging Lubrication Oil in the Same


    Weitere Titelangaben:

    증발가스 재액화 시스템 및 증발가스 재액화 시스템 내의 윤활유 배출 방법


    Beteiligte:
    SON JAE WOOK (Autor:in) / SHIN HYUN JUN (Autor:in) / KIM DONG CHAN (Autor:in)

    Erscheinungsdatum :

    2018-10-22


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Koreanisch


    Klassifikation :

    IPC:    B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING / 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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