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RISS 인기검색어
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- 저자 : 이원구(Wonkoo Lee) (검색결과 3 건)
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태양에너지를 활용한 소형 초임계 이산화탄소 사이클의 실험 연구
이원구(Wonkoo Lee),이권영(Kwon-yeong Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Renewable energy are in the spotlight in the field of power generation with international demands for green energy transformation and carbon net zero. Research on the supercritical carbon dioxide cycle is being conducted as one of CCU (Carbon Capture and Utilization) technologies without converting CO2 gas. While many studies are being conducted using carbon dioxide as a working fluid of a large Brayton cycle based on the nuclear field, there are lack of research in the renewable energy field such as solar energy. In this study, an experimental study on the supercritical carbon dioxide cycle using solar energy as a heat source was conducted. The experiment was conducted through a small-scaled experimental facility manufactured with 12 kW thermal capacity, and the power generation efficiency was evaluated by analyzing the experimental results. The thermal efficiency that was theoretically analyzed in the basic design stage was compared with the value obtained as a result of the experiment. The reason of the difference between two efficiency and the method for improving the experimental facility were presented.
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태양에너지를 활용한 소형 초임계 이산화탄소 사이클의 실험 연구
이원구(Wonkoo Lee),이권영(Kwon-yeong Lee) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Renewable energy are in the spotlight in the field of power generation with international demands for green energy transformation and carbon net zero. Research on the supercritical carbon dioxide cycle is being conducted as one of CCU (Carbon Capture and Utilization) technologies without converting CO2 gas. While many studies are being conducted using carbon dioxide as a working fluid of a large Brayton cycle based on the nuclear field, there are lack of research in the renewable energy field such as solar energy. In this study, an experimental study on the supercritical carbon dioxide cycle using solar energy as a heat source was conducted. The experiment was conducted through a small-scaled experimental facility manufactured with 12 kW thermal capacity, and the power generation efficiency was evaluated by analyzing the experimental results. The thermal efficiency that was theoretically analyzed in the basic design stage was compared with the value obtained as a result of the experiment. The reason of the difference between two efficiency and the method for improving the experimental facility were presented.
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In-Line Recondenser와 Pre-cooler가 적용된 LNG선 연료관리 시스템 설계
이원구(Wonkoo Lee),선현준(Hyunjun Sun),이권영(Kwon-Yeong Lee) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.3
액화천연가스(LNG)는 천연가스를 장거리로 운송하는 가장 경제적인 방법이다. LNG 운송 및 저장 과정에서 BOG(Boil Off Gas)가 발생하여 손실을 피할 수 없다. 이러한 손실을 막기 위해 BOG를 연료로 사용하거나 재액화 등의 방식을 취하고 있다. In-line Recondenser(이하 I-Recondenser)는 Static-Mixer와 같은 방식으로 BOG를 LNG에 빠르게 섞어 액화시키는 장치로서, 기존 Packed-Bed 형태 대비 부피는 2%, 무게는 1/15 수준이기 때문에 선박에 탑재하기에 용이하다. 이에 본 연구에서는 LNG 운반 및 추진 선박을 대상으로 I-Recondenser를 활용한 BOG 재액화 장치와 연료공급 시스템(FGSS)을 결합한 형태인 연료관리 시스템(FGMS)을 제안하고 개념설계를 수행하였다. BOG 전량을 액화시킨다는 설계 요건 하에서 Basic 모델과 Pre-cooling 모델로 나뉘어 진행되었다. 시뮬레이션을 통해 실현 가능성을 입증하였는데, 일정한 압력 조건에서 LNG의 질량유량이 증가함에 따라 BOG가 전량 액화되는 지점을 찾았다. 즉, Basic 모델은 LNG/BOG 질량유량 비율이 10일 때, Pre-cooling 모델은 8.22일 때 전량 액화되는 것을 확인하였다. Liquefied natural gas (LNG) is the most economical way to transport natural gas over long distances. In the process of LNG transportation and storage, BOG(Boil Off Gas) is generated, and losses are unavoidable. In order to prevent this loss, methods such as using BOG as fuel or re-liquefying it are being used. A recently proposed in-line recondenser is similar to a static mixer. It has 2% of the volume and 1/15 of the weight compared to an existing packed-bed recondenser, making it easy to mount on a ship. The purpose of this research is to propose a fuel gas management system(FGMS) for LNG ships using the in-line type recondenser and to perform basic design of the system. It was designed under the requirement of liquefying the entire amount of BOG according to the temperature and pressure conditions. The design was divided into a basic model and a pre-cooling model. The feasibility of the design was verified through simulation, and the total amount of liquefaction was realized through a method of increasing the mass flow rate of LNG with a constant pressure. The basic model had a LNG/BOG mass-flow ratio of 10, and the pre-cooling model liquefied BOG when the ratio was 8.22.
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