Study on mechanism of influence of composite solution on microstructure and wetting characteristics of coal

IF 2.8 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Muyao Zhu, Zhen Liu, He Yang, Lulong Jiao, Jian Zhang
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引用次数: 0

Abstract

The wettability of coal is a key factor influencing the efficiency of coal seam water injection and directly determines the effectiveness of dust control measures. This property is strongly governed by the physicochemical characteristics of the coal surface. To elucidate the effect of coal’s physical structure on its wettability, coal samples were treated with composite solutions of varying concentrations. Low-temperature nitrogen adsorption experiments and scanning electron microscopy were employed to quantitatively characterize the surface morphology and pore structure of the treated coal. The potential impact of structural variations on wetting behavior was investigated at the microscale. The results show that with the increase of solution concentration, the internal connectivity of coal is gradually enhanced, and the surface roughness and porosity of coal are also increased, from the original coal sample 0.0757 and 0.0851 to 0.1891 and 0.3045. In addition, after treatment with the composite solution, the two-dimensional fractal dimension (D) of coal gradually grew, increase from 1.642 to 1.588 to 1.814 and 1.869. While the three-dimensional D gradually shrunk, decrease from 2.73 to 2.546 to 2.667 and 2.533. The experiments showed that the smaller the three-dimensional D was, the stronger the coal wettability was. For the coal surface, when the proportion of the coal pore area was larger (i.e., two-dimensional D was larger), the stronger the coal wettability was. The results provide a theoretical basis for dust control.

复合溶液对煤微观结构及润湿特性的影响机理研究
煤的润湿性是影响煤层注水效率的关键因素,直接决定着降尘措施的效果。这种性质在很大程度上受煤表面的物理化学特性的支配。为了阐明煤的物理结构对其润湿性的影响,用不同浓度的复合溶液处理煤样。采用低温氮吸附实验和扫描电镜对处理后煤的表面形貌和孔隙结构进行了定量表征。在微观尺度上研究了结构变化对润湿行为的潜在影响。结果表明:随着溶液浓度的增加,煤的内部连通性逐渐增强,煤的表面粗糙度和孔隙度也有所增加,从原始煤样的0.0757和0.0851增加到0.1891和0.3045。此外,经复合溶液处理后,煤的二维分形维数(D)逐渐增大,从1.642增加到1.588,再增加到1.814和1.869。三维D逐渐缩小,从2.73 - 2.546下降到2.667 - 2.533。实验表明,三维D越小,煤的润湿性越强。对于煤表面,当煤孔面积占比越大(即二维D越大),煤的润湿性越强。研究结果为粉尘控制提供了理论依据。
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来源期刊
Environmental Earth Sciences
Environmental Earth Sciences 环境科学-地球科学综合
CiteScore
5.10
自引率
3.60%
发文量
494
审稿时长
8.3 months
期刊介绍: Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.
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