Effect of water immersion on pore structure of bituminous coal with different metamorphic degrees

被引：54
作者：
Song, Bobo [1 ,2 ]
Zhai, Xiaowei [1 ,2 ,3 ]
Ma, Teng [1 ,2 ]
Wang, Bo [1 ]
Hao, Le [1 ,2 ]
Zhou, Yujie [1 ,2 ]
机构：
[1] Xian Univ Sci & Technol, Sch Safety Sci & Engn, Xian 710054, Shaanxi, Peoples R China
[2] Shaanxi Univ, Mine Emergency Rescue Innovat Team, Youth Innovat Team, Taiyuan, Peoples R China
[3] Xian Univ Sci & Technol, Sch Safety Sci & Engn, 58,Yanta Mid Rd, Xian 710054, Shaanxi, Peoples R China
来源：
ENERGY | 2023年 / 274卷
基金：
中国国家自然科学基金;
关键词：
Coal; Water immersion; Metamorphic degree; Pore structure; Fractal dimension; Coal spontaneous combustion; GAS-ADSORPTION; SURFACE-AREA; SIZE DISTRIBUTION; NITROGEN; POROSITY; ISOTHERMS; CHEMISTRY; OXIDATION; PRESSURE; MOISTURE;
D O I：
10.1016/j.energy.2023.127449
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
It is important to understand the disaster-causing mechanism of dried water-immersed coal by investigating the influence of water immersion on the coal pore structure. In this study, low-temperature nitrogen adsorption experiments of eight bituminous coals with different metamorphic degrees and their dried water-immersed coals were carried out to analyze the adsorption/desorption mechanism and investigate the effects of water immersion on the pore shape, pore-structure parameters, and fractal dimension of coal. The results showed that adsorption of nitrogen on coal mainly includes micropore filling, monolayer adsorption, multilayer adsorption, and capillary condensation. The pores of coal were a continuous system from nanometer pores to relatively unlimited size pores. Water immersion did not significantly affect the pore shape of the coal, decreased the specific surface area and adsorption capacity, and increased the total pore volume and average pore diameter. It had the greatest effect on the average pore size of moderately metamorphosed coals, which may accelerate the oxidation process of coal and aggravate gas emission. The fractal results showed that water immersion reduced the surface fractal dimension of higher and lower metamorphic coal, while it increased that of moderately metamorphic coal, and it had the opposite effect on the structural fractal dimension.
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页数：12
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