Potential of liquefied natural gas cold energy recovery on board ships

Baldasso, Enrico; Mondéjar, María E.; Mazzoni, Stefano; Romagnoli, Alessandro; Haglind, Fredrik

doi:10.1016/j.jclepro.2020.122519

Cited by 19 publications

(13 citation statements)

References 31 publications

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“…Should the BOG generated in the tanks be insufficient to maintain a constant pressure therein, the LNG is vaporized with the FV, which has a control system to maintain the temperature at the outlet at À120 C (9). The BOG consumed by the engines is conditioned in the AC/NGH (12)(13)(14).…”

Section: Regasification Systemsmentioning

confidence: 99%

“…13 However, few studies evaluate the prospects for exploiting LNG cold energy on board ships. 14 Within this reduced number of publications, even fewer include a thermo-economic analysis. These studies focus on the installation of organic Rankine cycles (ORC) on LNG-fuelled vessels that use the high temperature waste heat energies of DF engines as heat sources and the cryogenic temperature of LNG as a sink.…”

Section: Introductionmentioning

confidence: 99%

“…The 3E analysis has been widely implemented in the assessment of thermodynamic cycles to recover the LNG cold energy 13 . However, few studies evaluate the prospects for exploiting LNG cold energy on board ships 14 . Within this reduced number of publications, even fewer include a thermo‐economic analysis.…”

Section: Introductionmentioning

confidence: 99%

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Energy, exergy and economic analysis of offshore regasification systems

Naveiro

Gómez

Insua

et al. 2021

Intl J of Energy Research

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Energy, exergy and economic analysis are proposed herein to evaluate regasification systems in Floating Storage Regasification Units (FSRUs). Three regasification systems typical in these types of vessels are considered: seawater system, open loop propane system and closed loop water-glycol system. The energy and exergy analyses were performed using the Engineering Equation Solver (EES), while Suite AspenONE programmes were used for the economic assessment. The exergy analysis provides a better understanding of the components of physical exergy (thermal and mechanical exergy) in order to define an exergy efficiency applicable to any liquefied natural gas (LNG) regasification system or FSRU. The results obtained prove the seawater regasification system to be most efficient from an energy and exergy standpoint. The specific energy consumption and exergy efficiency for this system are 227.33 kJ/kg and 50.00%, respectively. On the other hand, the open loop propane regasification system is most cost-effective for an LNG price between 1.32 and 11 USD/MMBtu. The vast amounts of destroyed exergy in the regasification process of current systems was also demonstrated and hence the need to develop new, more efficient configurations that could exploit the cold energy of LNG.

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Section: Regasification Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy, exergy and economic analysis of offshore regasification systems

Naveiro

Gómez

Insua

et al. 2021

Intl J of Energy Research

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“…enthalpy at the outlet and inlet of the heat exchanger. In this calculation, the temperature of the LNG at the outlet was xed at 268 K, and the system assumed adiabatic behavior 51 . Table 2 lists the embrittlement temperature and the speci c heat of the test plastics 52 − 56 .…”

Section: System Descriptionmentioning

confidence: 99%

Proposing a New Route to Solve Marine Debris Pollution Issues: Low-Temperature Eco-friendly Pulverization System by Utilizing LNG Cold Energy

Lee¹,

Park²,

Kim³

et al. 2021

Preprint

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Developing an effective and efficient recycling process for marine debris (MD) is one of the most urgent issues to maintain Earth’s sustainability. However, the restricted circumstances for collecting and separating MD in the ocean limit proper MD recycling. Here, we proposed a complete eco-friendly low-temperature MD pulverizing system that utilizes excessive liquefied natural gas (LNG) cold energy (LCE) in an LNG propulsion ship to improve the efficiency and effectiveness of MD recycling. The prototype design of the low-temperature pulverization (LTP) system showed that consumable refrigerant (liquid nitrogen) up to 2831 kg per hour could be substituted. Furthermore, we estimated the additional refrigerant needed for desired MD disposal depending on the ship speed to determine the optimal energy requirement. In addition, LTP systems utilizing LCE can significantly improve the storage capacity by pulverizing bulky MD. To determine the feasibility of LTP for MD recycling, four types of plastics obtained from actual MD from a coastal area in Busan, Korea were classified and tested.

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“…The h out and h in represent specific enthalpy at the outlet and inlet of the heat exchanger (J/kg). In this calculation, the temperature of the LNG at the outlet was fixed at 268 K, and the system assumed adiabatic behavior 57 . Table 2 lists the embrittlement temperature and the specific heat of the test plastics 58 – 62 .…”

Section: System Descriptionmentioning

confidence: 99%

Proposing a new solution for marine debris by utilizing on-board low-temperature eco-friendly pulverization system

Lee

Park

Kim

et al. 2021

Sci Rep

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Developing an effective and efficient recycling process for marine debris (MD) is one of the most urgent issues to maintain environmental sustainability on Earth. However, restricted storage capacities and secondary pollution (e.g., microbial adhesion, putrefaction) limit the proper MD recycling. Here, we proposed a complete eco-friendly low-temperature MD pulverizing system that utilizes excessive liquefied natural gas (LNG) cold energy (LCE) in an LNG propulsion ship to improve the efficiency and effectiveness of MD recycling. The prototype design of the low-temperature pulverization (LTP) system showed that consumable refrigerant (liquid nitrogen) up to 2831 kg per hour could be substituted. Furthermore, with a 20% ship output, 1250 kg of MD could be treated with 363 kg of additional refrigerant. In addition, LTP systems utilizing LCE could increase the storage capacity by more than 10 times compared to bulk MD while minimizing the required energy consumption. To determine the feasibility of LTP for MD recycling, four types of plastics obtained from actual MD from a coastal area in Busan, Korea were classified and tested.

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Potential of liquefied natural gas cold energy recovery on board ships

Cited by 19 publications

References 31 publications

Energy, exergy and economic analysis of offshore regasification systems

Energy, exergy and economic analysis of offshore regasification systems

Proposing a New Route to Solve Marine Debris Pollution Issues: Low-Temperature Eco-friendly Pulverization System by Utilizing LNG Cold Energy

Proposing a new solution for marine debris by utilizing on-board low-temperature eco-friendly pulverization system

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