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Simulation and optimization of liquefied natural gas cold energy power generation system on floating storage and regasification unit

ABSTRACT
In this paper, based on the idea of reducing heat exchanger exergy destruction and increasing turbine work, a new three-stage cascade Rankine system and a new four-stage cascade Rankine system is proposed to improve the cold energy utilization rate during liquefied natural gas(LNG) gasification on liquefied natural gas-floating storage and regasification unit. Then compare them with the original cascade Rankine cycle established under the same conditions. The results show that under the condition of 175 t/h LNG flow, the maximum net output power of the new three-stage cascade Rankine cycle system is 4593.31 kW, the exergy efficiency is 20.644%. The maximum net output power of the new four-stage cascade Rankine cycle system is 5013.93 kW, and the exergy efficiency is 22.509%. Compared with the original cascade Rankine cycle system, the maximum net output power of the new three-stage cascade Rankine cycle system and the new four-stage cascade Rankine cycle system is increased by 9.41% and 11.45%, respectively, and the system exergy efficiency is increased by 9.29% and 11.28%, respectively.
KEYWORDS
PAPER SUBMITTED: 2020-04-24
PAPER REVISED: 2020-06-22
PAPER ACCEPTED: 2020-06-30
PUBLISHED ONLINE: 2020-07-11
DOI REFERENCE: https://doi.org/10.2298/TSCI200404205X
REFERENCES
  1. Baris, B., et al, Cold utilization systems of LNG: A review, Renewable and Sustainable Energy Reviews, 79(2017), pp. 1171-1188 DOI No.10.1016/j.rser.2017.05.161
  2. Tianbiao, H., et al, A novel conceptual design of hydrate based desalination (HyDesal) process by utilizing LNG cold energy, Applied Energy, 222,(2018), pp. 13-24 DOI No.10.1016/j.apenergy.2018.04.006
  3. Wensheng, L., et al, A seawater freeze desalination prototype system utilizing LNG cold energy, International Journal of Hydrogen Energy, 42(2017),29, pp. 18691-18698 DOI No.10.1016/j.ijhydene.2017.04.176
  4. Inkyu, L., et al, A novel cryogenic energy storage system with LNG direct expansion regasification: Design, energy optimization, and exergy analysis, Energy, 173(2019), pp.691-705 DOI No.10.1016/j.energy.2019.02.047
  5. Tianbiao, H., et al, LNG cold energy utilization: Prospects and challenges, Energy, 170(2019), pp. 557-568 DOI No.10.1016/j.energy.2018.12.170
  6. Guoguang, M., et al, Multi-stage Rankine cycle (MSRC) model for LNG cold-energy power generation system, Energy, 165(2018), Part B, pp.673-688 DOI No.10.1016/j.energy.2018.09.203
  7. Wang, K., et al, Analysis of LNG Cold Energy Utilization Technology, Cryogenics, 01(2005), pp. 53-58 (in Chinese)
  8. Yanni, L., et al, Benefit Analysis of LNG Cold Energy Power Generation, Cryogenics & Superconductivity, 38(2010), 02, pp.13-17 (in Chinese)
  9. Yang, H., Optimization of Cold Energy Power Generation System for Liquefied Natural Gas (LNG), M. Sc. thesis, Beijing University of Technology, Beijing, China, 2010 (in Chinese)
  10. Yang, H., et al., Analysis of Low Temperature Power Cycle Based on LNG Gasification Segmentation Model, Natural Gas Industry, 30 (2010), 7, pp. 98-102 (in Chinese)
  11. Yang, H., et al., Optimization of LNG Cold Energy Cascade Utilization System, Renewable Energy Resources, 29 (2011), 1, pp. 72-75 (in Chinese)
  12. Zhixin, S., et al, Comparative study of Rankine cycle configurations utilizing LNG cold energy under different NG distribution pressures, Energy, 139(2017), pp.380-393 DOI No.10.1016/j.energy.2017.07.170
  13. Junjiang, B., et al, Simultaneous optimization of system structure and working fluid for the three-stage condensation Rankine cycle utilizing LNG cold energy, Applied Thermal Engineering, 140(2018), pp.120-130 DOI No.10.1016/j.applthermaleng.2018.05.049
  14. Hao, S., et al, A study of working fluids for Organic Rankine Cycles (ORCs) operating across and below ambient temperature to utilize Liquefied Natural Gas (LNG) cold energy, Energy, 167( 2019), pp.730-739 DOI No.10.1016/j.energy.2018.11.021
  15. Yao, S., et al, New Cold-Level Utilization Scheme for Cascade Three-Level Rankine Cycle Using the Cold Energy of Liquefied Natural Gas, Thermal Science,23(2019), 6B, pp. 3865-3875 DOI No.10.2298/TSCI171012239Y
  16. Xiu, W., et al, A novel combined system for LNG cold energy utilization to capture carbon dioxide in the flue gas from the magnesite processing industry, Energy, 187(2019), Article 115963 DOI No.10.1016/j.energy.2019.115963
  17. Chenghao, L., et al, Performance analysis of an improved power generation system utilizing the cold energy of LNG and solar energy, Applied Thermal Engineering, 159(2019), Article 113937 DOI No.10.1016/j.applthermaleng.2019.113937
  18. Junjiang, B., et al, Comparative study of liquefied natural gas (LNG) cold energy power generation systems in series and parallel, Energy Conversion and Management, 184( 2019), pp. 107-126 DOI No.10.1016/j.enconman.2019.01.040
  19. Hui, H., et al, The study of a novel two-stage combined rankine cycle utilizing cold energy of liquefied natural gas, Energy, 189(2019), Article 116290 DOI No.10.1016/j.energy.2019.116290
  20. Lee, Y., LNG-FSRU cold energy recovery regasification using a zeotropic mixture of ethane and propane, Energy,173( 2019), pp.857-869 DOI No.10.1016/j.energy.2019.02.11
  21. Hongming, H., et al, LNG physical radon and its recycling, Cryogenics, 06(2006), pp.58-61+66 (in Chinese)