保障新型海上天然气开发装置FLNG的储存安全性和经济性，有赖于减少液舱内LNG蒸发导致的闪蒸气累积；而现有液舱围护结构难以完全隔绝漏热来避免LNG蒸发。本项目基于FLNG周期性储存-卸货的特点，提出利用微孔涂层吸附蓄冷-解吸控温来抑制舱内LNG蒸发的新思路，并探究FLNG液舱环境下微孔涂层对低温多组分闪蒸气的吸附解吸和控温机制。具体研究包括：1）开展低温工况下多组分闪蒸气吸附平衡的实验和模型研究，掌握闪蒸气在微孔结构上的低温吸附平衡特性，考察微孔材料的吸附蓄冷能力；2）探究温升驱动下多组分闪蒸气的变温解吸特性及热效应，开发闪蒸气变温解吸的热质传递模型，考察微孔材料的解吸控温能力；3）面向FLNG液舱环境，探究温压耦合下闪蒸气动态吸脱附及热响应特性，明确微孔涂层在动态吸附-解吸下的控温机制。研究成果为设计基于吸附蓄冷-解吸控温的FLNG闪蒸抑制方法提供理论依据，并丰富低温天然气吸附理论。

Ensuring the storage safety and efficiency of the new-type offshore natural gas production device FLNG depends on reducing the accumulation of boil-off gas in LNG tank due to evaporation under heat leakage, while the existing tank containment structure can hardly insulate heat leakage completely. This project proposes a new technique idea to inhibit LNG evaporation based on the feature of periodically storage and offloading on FLNG, that is using microporous coating for cold storage by adsorption and thermal control by desorption; and investigates the effect mechanisms of microporous coating on the adsorption-desorption process and thermal control of cryogenic boil-off gas mixture in FLNG liquid tank. The investigation involves: 1) conducting experimental and modelling studies on the adsorption equilibrium performance of the multiple components of boil-off gas under cryogenic condition, aiming to obtain the cryogenic adsorption equilibrium characteristics of boil-off gas on microporous structure and evaluate the cold storage capacity of the microporous materials; 2) investigating the temperature swing desorption characteristics and the thermal effects of the multiple components of boil-off gas driven by temperature rise, and developing the mass and heat transfer model in temperature swing desorption of boil-off gas for evaluating the thermal control capacity of the microporous materials; 3) investigating the dynamic adsorption-desorption characteristics and thermal response of boil-off gas under the coupled effects of the dynamic temperature and pressure in FLNG liquid tank, and clarifying the thermal control mechanism of microporous coating under the dynamic adsorption and desorption. The research achievements will provide a theoretical basis of designing inhibition method for boil-off gas on FLNG with the utilization of adsorption-desorption cycle for cold storage and thermal control, and enrich knowledge of natural gas adsorption for cryogenic conditions.