Analysis of Energy Consumption of Novel Re-Liquefaction System Integrated with Fuel Supply System (FSS) for LPG-Fuelled LPG Carrier to Conventional Systems

Youngkyun Seo (), Jintae Kim, Eunyoung Park, Jinkwang Lee, Meangik Cho and Seongjong Han
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Youngkyun Seo: Offshore Industries R&BD Center, Korea Research Institute of Ships & Ocean Engineering, 1350 Geojebuk-ro, Geoje-si 53201, Republic of Korea
Jintae Kim: Offshore Industries R&BD Center, Korea Research Institute of Ships & Ocean Engineering, 1350 Geojebuk-ro, Geoje-si 53201, Republic of Korea
Eunyoung Park: Offshore Industries R&BD Center, Korea Research Institute of Ships & Ocean Engineering, 1350 Geojebuk-ro, Geoje-si 53201, Republic of Korea
Jinkwang Lee: Department of Naval Architecture and Offshore Engineering, Dong-A University, 37 Nakdong-daero 550, Busan 49315, Republic of Korea
Meangik Cho: Offshore Industries R&BD Center, Korea Research Institute of Ships & Ocean Engineering, 1350 Geojebuk-ro, Geoje-si 53201, Republic of Korea
Seongjong Han: Offshore Industries R&BD Center, Korea Research Institute of Ships & Ocean Engineering, 1350 Geojebuk-ro, Geoje-si 53201, Republic of Korea

Energies, 2022, vol. 15, issue 24, 1-15

Abstract: This study analysed a novel re-liquefaction system integrated with a fuel supply system (FSS) for an LPG carrier to conventional systems. The re-liquefaction system and FSS were installed independently in a conventional LPG carrier, while those systems were combined in the novel system. The condensed LPG in the re-liquefaction system was directly transferred to the FSS without the cooling and expansion process in the novel system. 84,000 m 3 LPG carrier equipped with a 10 MW engine at normal continuous rating (NCR) was selected as a target ship. Aspen HYSYS ver.12.1 was employed for process simulation. The results showed that the energy consumption for the novel system was reduced by 38%. The energy for re-liquefaction was decreased because the flow rate recirculated was decreased, and the energy for FSS was reduced as the temperature of the stream supplied to the FSS was relatively high in the novel system. A sensitivity analysis was conducted to investigate the effect of the parameters on the results. The investigated parameters were LPG compositions, seawater temperature, compressor efficiency, and pump efficiency. The energy consumption for the system was significantly different depending on the LPG composition, and the energy consumption was changed by 2.5% for conventional systems and 0.9% for the novel systems with the variation of 4 °C seawater temperature. The energy for the novel system was reduced by 2.8% for conventional systems and 2.3% for the novel systems with the 5% increment of compressor efficiency, whereas pump efficiency had little effect on the results.

Keywords: LPG; gas carrier; re-liquefaction system; fuel supply system; energy consumption (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: 2022
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