Comprehensive Fractal Description of Porosity of Coal of Different Ranks

Table 1

Coal quality analysis for coal sample.

Sample number	𝑀ad (%)	𝐴ad (%)	𝑉daf (%)	𝑅𝑜,max (%)	Porosity (%)
Number 1	1.69	6.45	36.33	0.38	7.25
Number 2	2.35	8.15	34.57	0.86	5.00
Number 3	0.61	11.14	18.59	1.60	3.42
Number 4	1.26	6.31	7.71	3.49	4.61

Note: the “𝑀_ad” is moisture, the “𝐴_ad” is ash, and the “𝑉_daf” is volatile matter of proximate analysis in coal. The “𝑅_𝑜,max” is the maximum reflectance of vitrinite.