Fuel gas re-liquefaction system

• Main Authors: KANG HOSUK, PAK KYUNGRYEUNG
• Format: Patent
• Language: English; Korean
• Published: 01.04.2021
• Subjects: BLASTING; EQUIPMENT FOR SHIPPING; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED,LIQUEFIED, OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; HEATING; LIGHTING; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; RELATED EQUIPMENT; SHIPS OR OTHER WATERBORNE VESSELS; STORING OF DISTRIBUTING GASES OR LIQUIDS; TRANSPORTING; VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED ORSOLIDIFIED GASES; WEAPONS

Disclosed is a fuel gas re-liquefaction system for increasing performance and efficiency of re-liquefaction of fuel gas even when the temperature of boil-off gas compressed and pressurized by a compressor is relatively high. According to an embodiment of the present invention, the fuel gas re-liquefaction system comprises: a storage tank configured to store liquefied gas; the compressor configured to compress the boil-off gas generated in the storage tank to generate the fuel gas; a re-liquefaction device including a heat exchanger configured to re-liquefy at least a portion of the boil-off gas pressurized by the compressor; and an expander installed between the rear end of the compressor and the re-liquefaction device based on the flow of the boil-off gas, wherein the expander is configured to expand and cool the pressurized boil-off gas, and supply the same to the heat exchanger. 압축기에 의해 압축되어 가압된 증발가스의 온도가 비교적 높은 경우에도 연료가스의 재액화 성능 및 효율을 높일 수 있는 연료가스 재액화 시스템이 개시된다. 본 발명의 실시예에 따른 연료가스 재액화 시스템은, 액화가스를 저장하는 저장탱크; 상기 저장탱크에서 발생된 증발가스를 압축하여 연료가스를 생성하는 압축기; 상기 압축기에 의해 가압된 증발가스 중의 적어도 일부를 재액화하는 열교환기를 포함하는 재액화기; 및 상기 증발가스의 흐름을 기준으로 상기 압축기의 후단과 상기 재액화기의 사이에 설치되는 팽창기를 포함한다. 상기 팽창기는 상기 가압된 증발가스를 팽창시켜 냉각시킨 후 상기 열교환기로 공급하도록 구성된다.