低阶煤与玉米芯低温共热解的产物特性分析

Characteristics of Low Temperature Co-pyrolysis Products of Low-rank Coal and Corncob

采用低温干馏装置对不同玉米芯加入量的褐煤/玉米芯混合物进行低温共热解实验。结果表明:当玉米芯加入量为30%时,焦油产率最大为11.70%,比褐煤单独热解提高了53.75%。随着玉米芯的加入量增加,热解气中CO、CH4和H2含量逐渐增大。对热解焦油进行GC-MS检测,发现添加30%玉米芯后脂肪族质量分数从褐煤单独热解的24%提高到了30.67%,酚类质量分数从6.29%提高到了18.49%,杂原子质量分数从29.75%降低到了13.33%,一定程度上实现了焦油的轻质化和高品质化。对热解半焦进行SEM、比表面积分析和热值测定,发现共热解半焦表面变粗糙,孔隙结构得到改善,热值明显高于褐煤单独热解半焦热值。

Low temperature distillation equipment was used to study the low temperature co-pyrolysis of lignite and corncob under different proportions.The results showed that when the corncob content was 30%,the tar yield reached 11.70%,which was 53.75% higher than that of the lignite mono-pyrolysis.With the addition of corncob,the contents of CO,CH 4 and H 2 in pyrolysis gas gradually increased.The results of GC-MS showed that as adding 30% corncob,aliphatic content increased from 24% to 30.67%,the phenol content increased from 6.29% to 18.49%,heteroatom content decreased from 29.75% to 13.33%,which achieved a substantial pyrolysis of tar and high-quality tar generation.The SEM,BET and heat value analysis of pyrolysis char showed that the surface of co-pyrolysis char became more rough,and the pore structure was improved.The heat value of co-pyrolysis char was obviously higher than the lignite pyrolysis separately.