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Geotechnical and Geological Engineering

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15-05-2019 | Original Paper

SEM Image Analysis of Pore and Fracture Characteristics of Lignite Under Temperature Gradient

Authors: Yue Song, Jun Xie, Lin Xin, Haizheng Fu

Published in: Geotechnical and Geological Engineering | Issue 6/2019

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Abstract

In order to study the microstructure characteristics of coal surface after different temperature and thermal effects of lignite, the SEM images of lignite after different temperatures were analyzed by means of theoretical analysis and experimental measurement (SEM microscanning electron microscopy) to studied the characteristics of organic matter and inorganic substance, fracture channel and pore structure. The results show that: At 150 °C, the volume of lignite expands and the pore size becomes larger, and the water loss fracture will be formed; 200 °C is the mutation temperature of the pore structure of lignite; After the temperature reaches 250 °C, the coal skeleton gradually becomes empty, the coal body starts to soften, produces colloidal fragments, and the fissure structure is more irregular; When the temperature reaches 350 °C, the ablation phenomenon is obvious.

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Title: SEM Image Analysis of Pore and Fracture Characteristics of Lignite Under Temperature Gradient
Authors: Yue Song
Jun Xie
Lin Xin
Haizheng Fu
Publication date: 15-05-2019
Publisher: Springer International Publishing
Published in: Geotechnical and Geological Engineering / Issue 6/2019
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI: https://doi.org/10.1007/s10706-019-00940-y

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