• 한국해양공학회지
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• 제38권5호
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• pp.245-256
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• 2024

As the importance of carbon capture and storage (CCS) technology increases for greenhouse gas reduction, CO2 transportation technology is also becoming crucial. Efficiently handling boil-off gas (BOG) generated during voyages is particularly important. This paper proposes a process incorporating two-stage separation and mixed refrigerants to reliquefy CO2 BOG containing nitrogen efficiently. This process was optimized based on specific power consumption (SPC) criteria and compared with the conventional single-stage separation using an ammonia refrigerant. The two-stage separation allows the removal of non-condensable gases, such as nitrogen, before expansion, and the use of mixed refrigerants enables more efficient heat exchange than ammonia refrigerants, improving the reliquefaction rate. As a result, the proposed process reduced SPC by up to 8.8 % with a nitrogen content of 5 mol% and up to 74.7 % with a nitrogen content of 15 mol%. In addition, the proposed process achieved a reliquefaction rate of over 74.2 % across all nitrogen content ranges of 5-15 mol%.

• 청정기술
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• 제20권1호
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• pp.1-6
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• 2014

화석연료로부터 에너지를 얻을 때, 연소반응에 의해 이산화탄소가 생성되어 진다. 이렇게 이산화탄소의 배출이 늘어나게 되면 지구온난화 문제가 더욱 심각해지게 된다. 따라서 이를 방지하기 위한 이산화탄소 포집 및 저장기술(carbon capture and storage, CCS) 개발이 요구되고 있다. 하지만 액화 이산화탄소를 수송 시 여러 문제로 인해 지속적으로 BOG (boil-off gas)가 발생하게 된다. 본 연구에서는 $40m^3$저장 탱크 2대에 액화 이산화탄소를 주입하여 압력변화 및 외부열과 선적, 하역 시 발생하는 BOG의 양과 조성을 30일 간 측정하였다. 측정한 결과 16,040 kg의 BOG가 발생하였으며, 조성은 $CO_2$ 99.95%, $N_2$ 0.05%인 것을 알 수 있었다. 또한 상용성 모사기인 PRO/II with PROVISION 9.2를 이용하여 발생한 BOG를 증기 재압축 냉동사이클을 통해 재액화 하는 전산모사를 수행하였다. 그 결과 냉동사이클의 총 순환유량은 42.07 kg/h, 응축기 설비의 소모량은 48.85 kg/h가 나오는 것을 알 수 있었다.

• 한국산업융합학회 논문집
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• 제27권5호
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• pp.1027-1040
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• 2024

The development of liquid CO₂ storage tanks and liquid CO₂ handling technology are key for liquid CO₂ carriers, and it is necessary to extract core patents of competitors that may lead to patent disputes in the future, establish response strategies, and strengthen the IP portfolio by creating new IPs. As a result of patent analysis for this purpose, patent applications and technology development are being led by the three large domestic shipbuilding companies(Hyundai, Samsung, and Hanwha) and the large Japanese shipbuilding company(MHI), and the handling of liquid CO₂ storage tanks and liquid CO₂ (prevention of dry ice formation) Technology-related patent applications and technology development are actively taking place, so there may be concerns about patent infringement. Currently, It has been confirmed that there are no core patents that are likely to cause patent disputes in the future. However, the technology concept in question lacks patentability as it is a combination of known technologies, so the creation of new IP is necessary to establish exclusive rights. Accordingly, through this project, four new IP creations and patent applications based on competitors' patents were completed. ① Technology to prevent the release of dry ice during unloading using filters, ② Technology to prevent the creation of dry ice in the unloading piping during unloading, ③ BOG reliquefaction technology to respond to CO₂ emission ban regulations, and ④ Technology that can utilize BOG within ships.