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采用氮吸附和压汞试验联合研究了煤的孔隙结构在自燃过程中的变化。实验数据表明200℃前不同温度煤的最可几孔径均为5 nm,区别主要表现为随着温度的升高煤中小于10 nm的孔越来越多。200℃~300℃煤的最可几孔径激增到350 nm。在煤自燃过程中孔隙率不断升高,比表面积先升高后降低,渗透率先降低再急剧升高然后又降低,密度不断降低,各参数与温度之间的关系可用多项式表达,均方差均大于0.998。
Nitrogen adsorption and mercury intrusion test were used to study the change of pore structure of coal during spontaneous combustion. The experimental data show that the most probable pore diameters of coal at different temperatures before 200 ℃ are both 5 nm, the main difference is that there are more and more pores in coal less than 10 nm with the temperature rising. The most probable aperture of coal at 200 ℃ ~ 300 ℃ increased to 350 nm. In the process of spontaneous combustion of coal, the porosity increases, the specific surface area first increases and then decreases, the permeability decreases first and then increases sharply, then decreases again and the density decreases continuously. The relationship between each parameter and temperature can be expressed by polynomial, 0.998.