水分对褐煤微观特性的影响研究

Study on Effect of Moisture on Micro-characteristics of Lignite

为了研究水分对褐煤微观特性的影响,采用低温真空干燥的方式对褐煤进行处理得到水分含量不同的褐煤,并对实验的3种煤样进行比表面积及孔径分析、自燃倾向性分析、原位红外光谱分析,结果表明:随着煤样水分的增大,煤样的最可几孔径逐渐增大,煤样的孔体积、比表面积和微分孔体积等表征煤样孔隙特征的参数与最可几孔径均有密不可分的联系;随着煤样水分的增大,煤样的物理吸氧量逐渐减小,减缓程度逐渐降低,煤样自燃倾向性加强,由Ⅱ类转向Ⅰ类;煤样中羟基、羧基及醚键会随着水分含量的降低而逐渐降低。

In order to study the effect of moisture on the microscopic properties of lignite, song coal was treated by low temperature vacuum drying to obtain lignite with different moisture content. The specific surface area and pore size of the three kinds of coal samples, the spontaneous combustion tendency and in situ infrared spectroscopy were analyzed. The experimental results show that the most probable pore size of the coal sample increases gradually along with the increase of the moisture content , pore characteristics of the coal sample such as pore volume, specific surface area,and differential pore volume are closely related to the most probable pore size; The physical oxygen absorption of coal samples gradually reduced,the degree slowed clown,the spontaneous combustion tendency of coal samples strengthened along with the increase of the moisture content; The hydroxyl, carboxyl and ether bond in the coal sample will decrease with the decrease of the moisture content.