Exploring the process robustness and dynamic response of directly Re-liquefying BOG using subcooled LNG

Liang Yin, Meng Qi, Xiaomin Xie and Yonglin Ju

Energy, 2025, vol. 316, issue C

Abstract: In this study, a dynamic simulation of a system for the direct re-liquefaction of boil-off gas (BOG) using subcooled liquefied natural gas (LNG) is carried out and compared with the steady-state results. By comparing and analyzing the effect of two different control strategies on stability: direct flow control and cascade control, it is found that the cascade control is superior. The effects of various parameter disturbances, including LNG temperature, LNG pressure and ambient temperature, are investigated to gain a comprehensive understanding of the stability and dynamic response of the process. Meanwhile, the system robustness is analyzed and the results indicate that the stream state entering the gas-liquid separator has the greatest impact on the system stability. When it is a pure liquid, the system has minimal fluctuations and can quickly restore dynamic equilibrium; when it is in the presence of a gas, the system will continue to fluctuate within tolerance limits. In addition, the disturbance on the temperature of the refrigerant entering the cold box, namely the ambient temperature, has a greater impact on the system compared to the disturbance of the pressure of the LNG itself. These conclusions bridge the gap of the steady-state simulations and also provide theoretical support for practical operation.

Keywords: Dynamic simulation; Boil-off gas; Re-liquefaction system; Robustness analysis (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:316:y:2025:i:c:s0360544225001550

DOI: 10.1016/j.energy.2025.134513

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