采用低温活性炭吸附的高效蒸发气储存

IF 5.5 0 ENERGY & FUELS
J.K. Wu , Y.X. Zhang , M. Yu , L. Jiang
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引用次数: 0

摘要

蒸发气(BOG)泄漏会导致资源浪费、环境破坏和安全风险,是液化天然气储存和运输过程中面临的重大挑战。与目前在沼液回收中广泛应用的低温再液化技术相比,低温吸附因其相对较低的设备投资和能耗而受到越来越多的关注。本研究旨在探讨低温吸附法回收BOG的可行性。制备了用于低温甲烷吸附的生物质椰壳活性炭材料,并对其BOG回收性能进行了系统研究。结果表明,KOH活化椰壳活性炭(CHCS-KOH)具有较高的比表面积(1710.28 m2/g)和最佳的甲烷吸附微孔结构,在133 K低温下可达到14.37 mmol/g的甲烷吸附量,这是以往试验中很少达到的。本文首次成功地拟合了改进的D-A模型,以描述甲烷在133 K至293 K的宽温度范围内的吸附。以CHCS-KOH为基础,建立了BOG吸附回收体系,并对其性能进行了分析。确定最佳贮藏温度为160 K,最小回收能耗为0.5645 kW h/kg,回收率为89.47%。这些发现为低温甲烷吸附和BOG回收的研究提供了新的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High-efficient boil-off gas storage using low-temperature activated carbon adsorption
Boil-off gas (BOG) leakage poses significant challenges during LNG storage and transportation, since it leads to resource waste, environmental damage, and safety risks. Compared with widely used cryogenic re-liquefaction in BOG recovery, low-temperature adsorption has attracted increasing attention due to relatively low equipment investment and energy consumption. This work aims to investigate the feasibility of cryogenic adsorption for BOG recovery. Biomass-derived coconut shell activated carbon materials for low-temperature methane adsorption are prepared, and their BOG recovery performance are systematically investigated. Results indicate that KOH activated coconut shell activated carbon (CHCS-KOH) has higher specific surface area (1710.28 m2/g) and optimal microporous structure for methane adsorption, achieving a remarkable methane adsorption capacity of14.37 mmol/g at the cryogenic temperature of 133 K, which is rarely reached in previous test. A modified D-A model is successfully fitted for the first time to describe methane adsorption across a wide temperature range from 133 K to 293 K. Based on CHCS-KOH, a BOG adsorption recovery system is established and its performance is analyzed. The optimal storage temperature is determined to be 160 K and minimum recovery energy consumption is 0.5645 kW h/kg with a recovery rate of 89.47 %. These findings may provide new methods for the research on low temperature methane adsorption and BOG recovery.
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CiteScore
11.20
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