The Evolution of Thermal Conductivity and Pore Structure for Coal under Liquid Nitrogen Soaking

Table 2

NMR spectrum integral area change.

Coal sample		Crest ratio (%)		Spectral integration area		Spectral integration area (%)
		Before treatment	After treatment	Before treatment	After treatment
Dry	First peak	95.99	95.91	5142.99	6049.09	17.6
	Second peak	2.99	2.63	159.94	165.85	3.7
Saturation	First peak	91.18	92.74	6037.05	12181.25	101.8
	Second peak	6.13	5.66	405.85	743.13	83.1