印尼褐煤与玉米芯低温共热解焦油的特性

Study on Tar Characteristics of Co-pyrolysis of Indonesian Lignite and Corncob at Low Temperature

采用自行设计的低温干馏装置,将不同配比下的褐煤-玉米芯混合物进行低温共热解实验.结果表明:当玉米芯配入量为30%(质量分数,下同)时,焦油产率达到最大值11.70%,比褐煤单独热解提高了53.75%.对褐煤、玉米芯及褐煤与玉米芯配入量为30%的混合样进行热重分析可知,玉米芯的添加降低了煤热解初始温度,整个TG曲线向低温区移动,表现出明显的促进热解作用.对热解焦油进行GC-MS检测,发现添加30%的玉米芯后热解焦油的脂肪类和酚类质量分数分别提高了27.79%和193.96%,酸类和杂原子类质量分数分别下降了26.42%和55.19%,轻质油含量由原来的4.68%提高到27.13%.玉米芯的添加实现了热解焦油大幅度轻质化和高品质焦油的生成.

Low-temperature co-pyrolysis experiment of lignite-corncob mixture at different mass fraction was carried out by using a self-designed low-temperature pyrolysis device.The results show that when the corncob mass fraction is 30%,the tar yield reaches 11.70%,which is 53.75%higher than that of the lignite pyrolysis.The thermogravimetric analysis of lignite,corncob,lignite and 30%corncob mixture shows that the addition of corncob reduces the initial pyrolysis temperature of coal,and the whole TG curves shift to the low temperature region,which shows obvious promotion of pyrolysis.The results of GC-MS show that the contents of aliphatic and phenol increase by 27.79%and 193.96%,while the contents of acids and heteroatoms decrease by 26.42%and 55.19%,respectively,with the addition mass fraction of 30%corncob.Moreover,the content of light oil increases from 4.68%to 27.13%,which achieves a substantial pyrolysis of tar and high-quality tar generation.