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Assessment of the moisture storage characteristics of lignite focusing on lignite type, moisture forms and drying mechanism
International Journal of Coal Preparation and Utilization ( IF 2.1 ) Pub Date : 2022-04-15 , DOI: 10.1080/19392699.2022.2064455
Lichao Ge 1 , Han Jiang 1 , Qian Li 2 , Hongcui Feng 3 , Xi Li 1 , Chunyao Xu 1 , Yuli Zhang 1 , Chang Xu 1
Affiliation  

ABSTRACT

To further study the occurrence form of moisture in coal, better understand the dehydration mechanism and the interaction between water and coal structure, as well as improve the utilization rate of lignite, non-isothermal and isothermal dehydration experiments were carried out on Zhaotong, Yimin and Zhundong coal samples under different initial conditions. The results showed that the dehydration rate of lignite is related to the temperature and initial water content. The effective moisture diffusion coefficient rises with an increase in temperature and water content. This indicated that the higher the temperature, the easier it is for water removal. In the isothermal dehydration experiment, the activation energy decreases with the increase of water content, indicating that the coal sample with large water content is easier to dehydrate, whilst the opposite result was obtained in non-isothermal dehydration experiment. According to the different drying mechanisms and characteristics at different stages, the total water content of lignite can be divided into four parts: chemical bound water, transitional bound water, physically bound water and free water. The removal mechanism and influencing factors of each have been analyzed in depth. The removal difficulty and required energy consumption is found to be successively reduced.



中文翻译:

以褐煤类型、水分形态和干燥机理为重点的褐煤储湿特性评价

摘要

为进一步研究煤中水分的赋存形态,更好地了解脱水机理及水与煤结构的相互作用,提高褐煤的利用率,在昭通、伊敏和等地开展了非等温和等温脱水试验。不同初始条件下的准东煤样。结果表明,褐煤的脱水率与温度和初始含水量有关。有效水分扩散系数随着温度和含水量的增加而增加。这表明温度越高,越容易去除水分。在等温脱水实验中,活化能随着含水量的增加而减小,说明含水量大的煤样更容易脱水,而在非等温脱水实验中得到了相反的结果。根据不同阶段干燥机理和特性的不同,褐煤的总含水量可分为化学结合水、过渡结合水、物理结合水和自由水四部分。深入分析了各自的去除机理和影响因素。发现去除难度和所需的能量消耗逐渐降低。深入分析了各自的去除机理和影响因素。发现去除难度和所需的能量消耗逐渐降低。深入分析了各自的去除机理和影响因素。发现去除难度和所需的能量消耗逐渐降低。

更新日期:2022-04-15
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