Study of the Effect of Drying on the Pore Structure and Rate of Oxygen Consumption and Heat Release of Immersed Lignite

Table 3

Porosity changes of raw coal and saturated dry coal.

Raw coal	Porosity (%)	Saturated dry coal	Porosity (%)	Percentage increase in porosity (%)	Average porosity increases (%)
1-1-Rc	20.1	1-1-ad-8 h	22.0	9.7	9.4
1-2-Rc	20.6	1-2-ad-8 h	22.7	10.3
1-3-Rc	21.0	1-3-ad-8 h	22.7	8.2
2-1-Rc	19.1	2-1-ad-24 h	22.3	16.4	16.5
2-2-Rc	18.1	2-2-ad-24 h	21.3	17.7
2-3-Rc	20.0	2-3-ad-24 h	23.1	15.4
3-1-Rc	20.2	3-1-ad-48 h	24.8	22.4	20.1
3-2-Rc	22.5	3-2-ad-48 h	26.8	19.1
3-3-Rc	21.4	3-3-ad-48 h	25.4	18.9