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首页> 外文期刊>RSC Advances >Effect of carbon dioxide on pore structure characteristics of dewatered lignite and the relevance to its moisture-adsorbing capacity
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Effect of carbon dioxide on pore structure characteristics of dewatered lignite and the relevance to its moisture-adsorbing capacity

机译：二氧化碳对脱水褐煤孔隙结构特征的影响及其与吸水能力的关系

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摘要

Lignite with a high moisture content is needed to effectively remove water and maximally restrain the readsorption capacity of dewatered coal. The ambient gas during lignite drying is an important factor influencing the physical properties of dewatered samples. CO2 is the main component of exhaust gas, which has been reused in flash drying technology. The relationship between the drying characteristics of a typical Chinese lignite and the pore structure changes of dewatered coal in a CO2 atmosphere, and the effect on the behavior of re-adsorbing moisture were studied. Drying experiments of lignite samples under an Ar atmosphere were also carried out for comparison. The moisture re-adsorption experiments of dewatered coal samples were conducted at 30 degrees C under relative humidity of 75%. The results show that the drying efficiency of coal samples under a CO2 atmosphere is higher than that under an Ar atmosphere due to the swelling effect caused by the adsorption of CO2, but this difference between CO2 and Ar becomes gradually smaller with increase in the drying temperature. The dewatered coal sample obtained under a CO2 atmosphere shows a stronger ability to re-adsorb moisture caused by the swelling effect, which could be attributed to the changes of the structure of the coal sample in this atmosphere and the increase of the surface area where the moisture is primarily absorbed. The total moisture content in the coal sample after re-adsorbing moisture follows a linear relationship with the specific surface area of dewatered lignite.
机译：需要具有高水分含量的褐煤以有效地去除水并最大程度地限制脱水煤的再吸收能力。褐煤干燥过程中的环境气体是影响脱水样品物理性能的重要因素。 CO2是废气的主要成分，已在闪蒸干燥技术中重复使用。研究了典型的褐煤的干燥特性与CO 2气氛下脱水煤的孔结构变化之间的关系，以及对水分再吸收行为的影响。为了进行比较，还进行了褐煤样品在Ar气氛下的干燥实验。脱水煤样品的水分再吸附实验是在30摄氏度，相对湿度为75％的条件下进行的。结果表明，由于CO2吸附引起的溶胀作用，CO2气氛下煤样品的干燥效率高于Ar气氛下，但随着干燥温度的升高，CO2与Ar之间的差异逐渐减小。在CO2气氛下获得的脱水煤样品显示出较强的重吸收水分（由溶胀效应引起）的能力，这可能归因于在该气氛下煤样品的结构变化和表面积的增加。水分主要被吸收。再吸附水分后，煤样品中的总水分含量与脱水褐煤的比表面积呈线性关系。

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