Abstract
In this paper, the efficient utilization of liquefied natural gas (LNG) vaporization cold energy in offshore liquefied natural gas floating storage regasification unit (FSRU) is studied. On the basis of considering different boil-off gas (BOG) practical treatment processes, a cascade comprehensive utilization scheme of cold energy of LNG based on the longitudinal three-stage organic Rankine cycle power generation and the low-grade cold energy used to frozen seawater desalination was proposed. Through the comparative analysis of the effects of the pure working fluid and eight mixed working fluids on the performance of the new system, the combination scheme of system mixed working fluid with the highest exergy efficiency of the system was determined. Then, the genetic algorithm was used to optimize the parameters of the new system. After optimization, the net output power of the LNG cold energy comprehensive utilization system proposed in this paper was 5186 kW, and the exergy efficiency is 30.6%. Considering the power generation and freshwater revenue, the annual economic benefit of the system operating is 18.71 million CNY.
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Abbreviations
- BOG:
-
Boil-off Gas
- D:
-
Seawater desalination flow
- DCR:
-
Deep cooler
- DEQ:
-
Desalination equipment
- F:
-
First working fluid flow
- FSRU:
-
Floating Storage Regasification Unit
- L:
-
LNG working fluid state
- LHEX:
-
LNG heat exchanger
- LNG:
-
Liquefied Natural Gas
- LNGPP:
-
Liquefied natural gas pump
- ORC:
-
Organic Rankine Cycle
- PCR:
-
Precooler
- S:
-
Second working fluid flow
- SW:
-
Seawater
- T:
-
Third working fluid flow
- TB:
-
Turbine
- WFPP:
-
Working fluids pump
- WHEX:
-
Working fluids heat exchanger
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Acknowledgements
This research was supported by special project of R&D and industrialization of Marine equipment of national development and reform commission of China (National Development and Reform Commission High Technology [2015] No.1409)
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Yao, S., Wang, M., Yan, L. et al. Construction and Optimization of Liquefied Natural Gas Regasification Cold Energy Comprehensive Utilization System on Floating Storage Regasification Unit. J. Therm. Sci. 31, 1853–1867 (2022). https://doi.org/10.1007/s11630-022-1597-6
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DOI: https://doi.org/10.1007/s11630-022-1597-6