轻度热解提质褐煤孔结构研究

对霍林河褐煤热重分析的基础上,在管式炉中进行轻度热解实验,通过低温N2吸附研究了热解前后煤样的孔隙特性,考察不同热解温度,恒温时间对煤孔结构的影响。结果表明:热解温度和恒温时间对褐煤的孔结构分布影响较大。褐煤和提质煤的吸附脱附等温曲线都存在吸附回线,但褐煤比提质褐煤的吸附回线宽,说明提质煤的微孔数量减少,大孔数量增多。与褐煤相比,轻度热解处理后,褐煤的比表面积减少,孔容减小,平均孔径增大。

Pore structure of mild pyrolysis of upgrading lignite

Based on the TGA analysis of Huolinhe lignite, experiments were performed to explore the process of slight pyrolysis in the tube furnace. Low-temperature nitrogen adsorption methods were used to study the pore characteristics of the coal sample before and after pyrolysis. Influences of different of pyrolysis temperature and constant temperature time on the coal pore structure were investigated. The results shows that pyrolysis temperature and constant temperature time have significant influences on the pore structure distribution, the adsorption and desorption isotherms are not coincident while the difference of raw coal is greater which indicates the upgraded coal has fewer mierospores and more largerpores. Compared with the raw coal, surface area and pore volume decrease and average pore size increased after slight pyrolysis.