低阶煤与玉米芯低温共热解的产物特性分析

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。

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

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, CH₄ and H₂ 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.