Multi Stage Organic Rankine Cycle Using Boil-Off Gas on Liquefied Hydrogen Carrier

Dahye Sung, Wongwan Jung and Jungho Choi ()
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Dahye Sung: Department of Naval Architecture and Offshore Engineering, Dong-A University, 37 Nakdong-daero 550 Boen-gil, Saha-gu, Busan 49315, Republic of Korea
Wongwan Jung: Department of Naval Architecture and Ocean Engineering, Dong-A University, 37 Nakdong-daero 550 Boen-gil, Saha-gu, Busan 49315, Republic of Korea
Jungho Choi: Department of Naval Architecture and Offshore Engineering, Dong-A University, 37 Nakdong-daero 550 Boen-gil, Saha-gu, Busan 49315, Republic of Korea

Energies, 2024, vol. 17, issue 24, 1-13

Abstract: In this study, a Reheat Organic Rankine Cycle (ORC) utilizing the cold energy of liquefied hydrogen (LH 2 ) and liquefied natural gas (LNG) was proposed, and its performance was evaluated by comparing it with the base model, which represented a conventional ORC. The process was simulated using ethane and propane, which were considered as potential refrigerants for the target system. A case study was conducted on the inlet pressure and temperature of the turbine included in the process to determine the optimal operating point. The calculation results indicated that ethane exhibited a higher energy efficiency, and a maximum net power of 34.65 kW was obtained when the inlet pressure and temperature of the turbine were 40 bar and 75 °C, respectively. Additionally, an exergy analysis was conducted to quantitatively analyze the high energy efficiency of the Reheat ORC model. We confirmed that exergy efficiency was up to 2.4% higher than that of the base model.

Keywords: organic rankine cycle; LNG; LH 2; boil-off gas; ethane; exergy analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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