The present invention relates to a system for maintaining pressure of a liquefied carbon dioxide storage tank controlling inner pressure of a liquefied carbon dioxide storage tank storing liquefied carbon dioxide, a method thereof, and a liquefied carbon dioxide carrier including the same, capable of improving stability of transportation and storage. According to the present invention, the system for maintaining pressure of a liquefied carbon dioxide storage tank includes: an evaporator for substitution evaporating liquefied carbon dioxide stored in a storage tank; a spray pump supplying the liquefied carbon dioxide to the evaporator for substitution; a safety valve reducing the pressure of the storage tank by discharging gas in the storage tank when the pressure of the storage tank reaches opening pressure; a pressure sender measuring the pressure of the storage tank; and a control unit supplying high-temperature compressed carbon dioxide to the storage tank by operating the spray pump and the evaporator for substitution when a pressure measurement value transmitted from the pressure sender rises to a first setting value or is decreased to a second setting value, thereby raising the pressure of the storage tank. The first setting value is a pressure lower than the opening pressure of the safety valve by a first predetermined value. The second setting value is a pressure higher than a triple point pressure of the carbon dioxide by a second predetermined value. The control unit controls the pressure of the storage tank so that the pressure of the storage tank is maintained within a driving range between the first setting value and the second setting value.

    본 발명은 액체상태의 이산화탄소를 저장하는 액화이산화탄소 저장탱크의 내압을 제어하는 액화이산화탄소 저장탱크의 압력 유지 시스템 및 방법, 그리고 이를 포함하는 액화이산화탄소 운반선에 관한 것이다. 본 발명에 따른 액화이산화탄소 저장탱크의 압력 유지 시스템은, 저장탱크에 저장되어 있는 액화이산화탄소를 기화시키는 치환용 기화기; 상기 액화이산화탄소를 치환용 기화기로 공급하는 스프레이 펌프; 상기 저장탱크의 압력이 개방압력에 도달하면 개방되어 저장탱크 내 기체를 배출시켜 저장탱크의 압력을 낮추는 안전밸브; 상기 저장탱크의 압력을 측정하는 압력 송출기; 및 상기 압력 송출기로부터 전송받은 압력 측정값이 제1 설정값까지 상승하거나, 제2 설정값까지 감소하면 상기 스프레이 펌프 및 치환용 기화기를 작동시켜 고온 압축 이산화탄소가 상기 저장탱크로 공급되도록 함으로써, 상기 저장탱크의 압력을 상승시키는 제어수단;을 포함하며, 상기 제1 설정값은 상기 안전밸브의 개방압력보다 제1 특정값만큼 낮은 압력이고, 상기 제2 설정값은 이산화탄소의 삼중점 압력보다 제2 특정값만큼 높은 압력이며, 상기 제어수단은 상기 저장탱크의 압력을 제1 설정값과 제2 설정값 사이의 운전범위 내에서 유지되도록 제어한다.


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    Title :

    Pressure Control System and Method for Liquefied Carbon Dioxide Storage Tank for Liquefied Carbon Dioxide Carrier


    Additional title:

    액화이산화탄소 저장탱크 압력 유지 시스템 및 방법, 그리고 액화이산화탄소 운반선


    Contributors:

    Publication date :

    2023-11-27


    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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