褐煤与大豆荚共热解的产物特性分析

利用自制的低温热解装置研究褐煤与大豆荚共热解的产物特性，考察大豆荚掺混比和催化剂Fe₂O₃对热解产物特性的影响。通过FT-IR、GC-MS、SEM-EDX和UV-vis分析共热解产物的性质，并将半焦用于亚甲基蓝吸附实验。研究结果表明：掺混比30%时，共热解焦油的产率达到最大值11.98%，比煤焦油产率增加44.86%，与计算值的正偏差最大（0.8%），同时，大豆荚的添加有促进焦油生成的协同作用。大豆荚的添加有利于共热解焦油中含氧杂环的断裂，使共热解焦油中直链烷烃增多，芳香族化合物减少，使重质组分转化为轻质组分，从而提高焦油品质；同时，大豆荚的添加使共热解半焦的含氧基团增加，微观形貌变粗糙。而Fe₂O₃的加入使共热解焦油中酚、醇类物质增加；加Fe₂O₃共热解半焦的褶皱更加明显。共热解半焦对亚甲基蓝的吸附率为33.62%，比煤半焦的吸附率提高8.84%，加Fe₂O₃共热解半焦的吸附率为55.57%，比共热解半焦提高65.29%。

Characteristic Analysis of Co-pyrolysis Products of Lignite and Soybean Pod

The characteristics of co-pyrolysis products of lignite and soybean pod were studied by using homemade carbonization apparatus and the influences of different soybean pod ratios and blending Fe₂O₃ in lignite on the yields were also studied.The characteristics of co-pyrolysis products were analyzed by FT-IR, GC-MS, SEM-EDX and UV-vis, meanwhile, the char was used to study the adsorption of methylene blue.The results showed that the yield of pyrolysis tar rose to 11.98% with the blending ratio of 30%, which was increased by 44.86% compared to lignite pyrolysis alone and reached the most-positive deviation to the theoretical values(0.8%) and the results indicated that the addition of soybean pod had synergistic effect of promoting the production of tar.The addition of soybean pod could facilitate the breakage of oxygen-containing heterocycles, increase the number of straight-chain alkanes and reduce of aromatic compounds in co-pyrolysis tar. It could also enhance the quantity of oxygen-containing groups and the surface roughness of co-pyrolysis char. Blending of Fe₂O₃ increased the phenols and alcohols content in co-pyrolysis tar, and the folds of the char were more obvious. The methylene blue removal rate of co-pyrolysis char reached 33.62%, which was risen by 8.84% compared with that of coal char. And the removal rate of co-pyrolysis char with Fe₂O₃ reached 55.57%, which was risen by 65.29% compared with that of co-pyrolysis char.