DOI QR코드

DOI QR Code

Development of partial liquefaction system for liquefied natural gas carrier application using exergy analysis

  • Choi, Jungho (Department of Naval Architecture and Offshore Engineering, Dong-A University)
  • 투고 : 2017.07.31
  • 심사 : 2017.11.17
  • 발행 : 2018.09.30

초록

The cargo handling system, which is composed of a fuel gas supply unit and cargo tank pressure control unit, is the second largest power consumer in a Liquefied Natural Gas (LNG) carrier. Because of recent enhancements in ship efficiency, the surplus boil-off gas that remains after supplying fuel gas for ship propulsion must be reliquefied or burned to regulate the cargo tank pressure. A full or partial liquefaction process can be applied to return the surplus gas to the cargo tank. The purpose of this study is to review the current partial liquefaction process for LNG carriers and develop new processes for reducing power consumption using exergy analysis. The developed partial liquefaction process was also compared with the full liquefaction process applicable to a LNG carrier with a varying boil-off gas composition and varying liquefaction amounts. An exergy analysis showed that the Joule-Thomson valve is the key component needed for improvements to the system, and that the proposed system showed an 8% enhancement relative to the current prevailing system. A comparison of the study results with a partial/full liquefaction process showed that power consumption is strongly affected by the returned liquefied amount.

키워드

참고문헌

  1. Alabdulkarem, Abdullah, Mortazavia, Amir, Hwang, Yunho, Radermacher, Reinhard, Rogers, Peter, 2011. Optimization of propane pre-cooled mixed refrigerant LNG plant. Appl. Therm. Eng. 31(6-7), 1091-1098. https://doi.org/10.1016/j.applthermaleng.2010.12.003
  2. Cao, Wen-sheng, Lu, Xue-sheng, Lin, Wen-sheng, Gu, An-zhong, 2006. Parameter comparison of two small-scale natural gas liquefaction processes in skidmounted packages. Appl. Therm. Eng. 26(8-9), 898-904. https://doi.org/10.1016/j.applthermaleng.2005.09.014
  3. Chang, Ho Myung, 2015. A thermodynamic review of cryogenic refrigeration cycles for liquefaction of natural gas. Cryogenics 1, 127-147. Cryogenics. Web.
  4. Choi, D.K., Kang, J.K., Moon, Y., Jung, J., Kwon, O., Kim, N.S., 2014. Hybrid FGS system with partial Re-Liquefaction unit for MEGI propelled LNG carrier. In: Gastech Conference.
  5. Ding, He, Sun, Heng, He, Ming, 2016. Optimization of expansion liquefaction process using mixed refrigerant $N_2-CH_4$. Appl. Therm. Eng. 93, 1053-1060. https://doi.org/10.1016/j.applthermaleng.2015.10.004
  6. Lee, Sanggyu, et al., 2013. The study on natural gas liquefaction cycle development for LNG-FPSO. In: Twenty-second (2012) International Offshore and Polar Engineering Conference, vol. 4, 880653. N.p.
  7. Morosuk, T., Tesch, S., Hiemann, A., Tsatsaronis, G., Bin Omar, N., 2015. Evaluation of the PRICO liquefaction process using exergy-based method. J. Nat. Gas Sci. Eng. 27(1), 23-31. https://doi.org/10.1016/j.jngse.2015.02.007
  8. Nogal, Frank Del, Kim, Jin-Kuk, Perry, Simon, Smith, Robin, 2008. Optimal design of mixed refrigerant cycles. Ind. Eng. Chem. 47(22), 8724-8740. https://doi.org/10.1021/ie800515u
  9. Remeljej, C.W., Hoadley, A.F.A., 2006. An exergy analysis of small-scale liquefied natural gas (LNG) liquefaction process. Energy 31(2), 2005-2019. https://doi.org/10.1016/j.energy.2005.09.005
  10. Shin, Younggy, Leeb, Yoon Pyo, 2009. Design of a boil-off natural gas reliquefaction control system for LNG carriers. Appl. Energy 86(1), 37-44. https://doi.org/10.1016/j.apenergy.2008.03.019
  11. Tirandazi, Behnam, Mehrpooya, Mehdi, Vatani, Ali, Ali Moosavian, S.M., 2011. Exergy analysis of C2+ recovery plants refrigeration cycles. Chem. Eng. Res. Des. 89(6), 676-689. https://doi.org/10.1016/j.cherd.2010.10.006
  12. Vink, K.J., Nagelvoort, R.K., 1998. Comparison of baseload liquefaction processes. In: Proceedings 12th International Conference on Liquefied Natural Gas, Paper, vol. 3.
  13. Yumrutas, Recep, Kunduz, Mehmet, Kanoglu, Mehmet, 2002. Exergy analysis of vapor compression refrigeration systems. Exergy Int. J. 2(4), 266-272. https://doi.org/10.1016/S1164-0235(02)00079-1

피인용 문헌

  1. Effect of precooling with transcritical CO2 cycle on two types of LNG boil-off gas reliquefaction systems vol.89, pp.None, 2018, https://doi.org/10.1016/j.jngse.2021.103876
  2. Thermal Efficiency and Economics of a Boil-Off Hydrogen Re-Liquefaction System Considering the Energy Efficiency Design Index for Liquid Hydrogen Carriers vol.14, pp.15, 2018, https://doi.org/10.3390/en14154566
  3. R290 냉매를 이용한 수소 충전소 냉각시스템 엑서지 분석 및 공정 최적화 vol.32, pp.5, 2021, https://doi.org/10.7316/khnes.2021.32.5.356
  4. Essential design criteria for safe and efficient operation of an LNG boil-off gas reliquefier under deteriorated performance of system components vol.120, pp.None, 2018, https://doi.org/10.1016/j.cryogenics.2021.103371