Hot-air drying behavior of lignite and quantitative characterization for its surface damage

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL Drying Technology Pub Date : 2023-06-24 DOI:10.1080/07373937.2023.2223621
T. Zhang, Chenfei Lou, Daoguang Teng, Guosheng Li, Peng Li, Qinghang Yun, Guoli Zhou
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Abstract

Abstract Cracking and fragmentation problems that occur during lignite drying limit its utilization value. In this study, the dehydration, surface damage, and pulverization behaviors of lignite were investigated under hot-air drying conditions, and the effect of the dewatering process on shrinkage cracking was analyzed. Cracks first appear at the edges of the lignite, then gradually extend inward until they spread over the entire surface of the lignite, before beginning to shrink, and eventually stabilize. The crack rate exhibited three stages: rapid development, shrinkage, and stabilization. The crack rate and shrinkage percentage increased significantly with increase in the drying temperature. The moisture content had a greater influence on the crack rate and shrinkage percentage of the samples than the surface temperature. A uniaxial compression test revealed that lignite with different degrees of dryness exhibited different degrees of breakage. The drying process drives the lignite toward finer grain sizes and, with moisture content below 0.8 g/g, the degree of breakage increases significantly. Thus, the main factor affecting the shrinkage and cracking of lignite was the moisture content. Cracks occurred when the tensile strain caused by shrinkage was greater than the tensile strength of the lignite.
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褐煤热风干燥特性及其表面损伤的定量表征
摘要褐煤干燥过程中出现的裂解和碎裂问题限制了其利用价值。本研究研究了褐煤在热风干燥条件下的脱水、表面损伤和粉碎行为,并分析了脱水过程对收缩开裂的影响。裂缝首先出现在褐煤的边缘,然后逐渐向内延伸,直到它们扩散到褐煤的整个表面,然后开始收缩,并最终稳定下来。裂纹率表现为三个阶段:快速发展、收缩和稳定。随着干燥温度的升高,裂纹率和收缩率显著增加。水分含量对试样的裂纹率和收缩率的影响大于表面温度。单轴压缩试验表明,不同干度的褐煤表现出不同程度的破碎。干燥过程使褐煤粒度变细,含水量低于0.8 g/g时,断裂程度显著增加。因此,影响褐煤收缩和开裂的主要因素是含水量。当收缩引起的拉伸应变大于褐煤的拉伸强度时,就会出现裂纹。
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来源期刊
Drying Technology
Drying Technology 工程技术-工程:化工
CiteScore
7.40
自引率
15.20%
发文量
133
审稿时长
2 months
期刊介绍: Drying Technology explores the science and technology, and the engineering aspects of drying, dewatering, and related topics. Articles in this multi-disciplinary journal cover the following themes: -Fundamental and applied aspects of dryers in diverse industrial sectors- Mathematical modeling of drying and dryers- Computer modeling of transport processes in multi-phase systems- Material science aspects of drying- Transport phenomena in porous media- Design, scale-up, control and off-design analysis of dryers- Energy, environmental, safety and techno-economic aspects- Quality parameters in drying operations- Pre- and post-drying operations- Novel drying technologies. This peer-reviewed journal provides an archival reference for scientists, engineers, and technologists in all industrial sectors and academia concerned with any aspect of thermal or nonthermal dehydration and allied operations.
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