Analysis of the Change Feature and Action Mechanism of Coal Pore Structure under the Action of Supercritical CO₂

Table 1

Basic parameters of coal samples before and after ScCO₂ treatment.

Coal sample		(g/cm^3)	(%)		(%)	(m^3/t)	(m^3/t)	ψ (%)
	(g/cm^3)			(%)
Raw coking coal	1.51	1.38	0.71	30.27	17.53	23.310	1.029	8.6
ScCO2-treated coking coal	1.52	1.39	0.62	30.71	17.71	23.641	0.838	8.55
Raw anthracite	1.56	1.49	4.12	11.18	9.72	29.412	2.252	4.49
ScCO2-treated anthracite	1.55	1.48	2.35	7.48	9.50	39.375	3.175	4.52

Note: ρ: true density; ρ^t: visual density; M_ad: moisture; V_daf: volatile matter; A_ad: ash yield; a and b: adsorption constants; ψ: porosity.