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基于DMR的BOG再液化系统学术论文被《cryogenics》接收


65.8K
2018-04-22
 Ref: CRYOGENICS_2018_4_R1
Title: A new boil-off gas re-liquefaction system for LNG carriers based on dual mixed refrigerant cycle
Journal: Cryogenics

Dear Dr. Tan,

I am pleased to inform you that your paper has been accepted for publication. My own comments as well as any reviewer comments are appended to the end of this letter. Now that your manuscript has been accepted for publication it will proceed to copy-editing and production.

Thank you for submitting your work to Cryogenics. We hope you consider us again for future submissions.

Kind regards,

Bertrand Baudouy
Editor
Cryogenics

 

 A new boil-off gas re-liquefaction system for LNG carriers based on dual mixed refrigerant cycle

Abstract: A new boil-off gas (BOG) re-liquefaction system for LNG carriers has been proposed to improve the system energy efficiency. Two cascade mixed refrigerant cycles (or dual mixed refrigerant cycle, DMR) are used to provide the cooling capacity for the re-liquefaction of BOG. The performance of the new system is analysed on the basis of the thermodynamic data obtained in the process simulation in Aspen HYSYS software. The results show that the power consumed in the BOG compressor and the high-temperature mixed refrigerant compressor could be saved greatly due to the reduced mass flow rates of the processed fluids. Assuming the re-liquefaction capacity of the investigated system is 4557.6 kg/h, it is found that the total power consumption can be reduced by 25%, from 3444 kW in the existing system to 2585.8 kW in the proposed system. The coefficient of performance (COP) of 0.25, exergy efficiency of 41.3% and the specific energy consumption (SEC) of 0.589 kWh/kg(LNG) could be achieved in the new system. It exhibits 33% of improvement in the COP and exergy efficiency in comparison with the corresponding values of the existing system. It indicates that employing the DMR based BOG re-liquefaction system could improve the system energy efficiency of LNG carriers substantially.

Key words: Dual Mixed Refrigerant cycle; Boil-off gas re-liquefaction; LNG; Performance improvement.