Nanopore Characteristics of Coal and Quantitative Analysis of Closed Holes in Coal.

It can be seen from Table 2 , Figures 3 , and 4 that as the degree of metamorphism increases, the SSA and total pore volume of the coal sample simultaneously decrease first and then increase sharply, and the average pore size generally shows an increasing trend first and then a decreasing trend sharply; among them, the coal sample of Zhaozhuang Mine, as the anthracite coal with the highest metamorphism degree, has the largest SSA and total pore volume and the smallest average pore diameter compared with other bituminous coal samples with medium and low metamorphism degrees, this indicates that the degree of coal metamorphism has a greater influence on the SSA, total pore volume, and average pore size of the coal samples.

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The results show that with the increase of the degree of coal metamorphism, the total pore volume and specific surface area of coal samples show a decreasing trend first and then an increasing trend, while the average pore diameter of coal samples gradually increases first and then decreases sharply.

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