A cryogenic CO2 capture system coupled with boil-off gas re-liquefaction for LNG carriers

被引：0

作者：

Shu, Gequn ^{[1
,2
]}

Liu, Borui ^{[1
]}

Tian, Hua ^{[1
]}

Li, Ligeng ^{[1
]}

Sun, Rui ^{[1
]}

Wang, Xuan ^{[1
]}

机构：

[1] Tianjin Univ, State Key Lab Engines, Tianjin 300072, Peoples R China

[2] Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230027, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2025年 / 362卷

基金：

中国国家自然科学基金;

关键词：

Cryogenic CO2 capture; Onboard carbon capture; LNG carriers; BOG re-liquefaction; Full operation condition; Thermo-economic assessment; DESIGN;

D O I：

10.1016/j.seppur.2025.131783

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

With the rising global demand for liquefied natural gas (LNG) in various fields, the need for LNG carriers has increased, which causes elevated CO2 emission. Thus, CO2 capture technology to achieve carbon neutrality on large LNG carriers has become a research concern. Besides, boil-off gas (BOG) is constantly generated which is due to the unavoidable heat leaks during the voyage resulting in the vaporization of several LNG. Therefore, a novel cryogenic on-board carbon capture (COCC) system making full use of LNG cold energy coupled with a BOG re-liquefaction (COCC-RL) system is firstly proposed, and the full operation conditions are considered. In this integrated system, superior thermal matching allows for CO2 capture in the exhaust, natural gas fuel vaporization and BOG re-liquefaction. It is astounding that the small capacity capture system could also produce a more competitive annual total profit (ATP) (4.13 x 104 $/ton) at a higher CO2 capture rate (56.69 %) compared to a high main load as design point. Therefore, a hitherto unexploited solution avenue has emerged, presenting a novel direction for designing a cryogenic on-board carbon capture system coupled with BOG re-liquefaction at variable engine loads and shows the potential of cryogenic CO2 capture technology in the shipping industry.

引用

页数：17

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