焦油模型物与木屑共热解产物分布规律研究

Study on the distribution law of co-pyrolysis products of tar models and sawdust

利用甲苯和乙酸为焦油模型物,以杉木屑为原料,在一级固定床反应系统中进行共热解实验,以实现木屑热解最大化脱除焦油产气,并探讨不同温度下共热解产物分布规律及产物之间的协同作用。结果表明,与木屑单独热解相比,木屑与甲苯、乙酸共热解产生的协同作用呈现出优越的焦油脱除效果。尤其,木屑与甲苯共热解可有效地将焦油产率减少81.47%,从焦油组分来看,含氧类化合物在共热解过程中不能有效脱除,而芳烃类化合物在热解过程中易通过高温共热解脱除,乙酸与木屑共热解的协同作用较甲苯强度稍弱。共热解产物产率变化受温度影响显著,其变化规律与纯木屑单独热解一致,热解温度升高对半焦、焦油的抑制效果增强,为焦油脱除及高效转化提供了理论基础。

In this study,toluene and acetic acid were investigated as model biomass tars,and sawdust was used as the feedstock.Co-pyrolysis experiments were conducted in a first-order fixed-bed reaction system to maximize the tar removal from sawdust.The distribution of co-pyrolysis products at different temperatures and the synergistic effects among the products were discussed.The results showed that compared to the pyrolysis of sawdust alone,the co-pyrolysis of sawdust with toluene and acetic acid exhibited a superior tar removal effect.Specifically,the co-pyrolysis of sawdust and toluene effectively reduced the tar yield by 81.47%.From the perspective of tar components,oxygen-containing compounds could not be effectively removed during the co-pyrolysis process,while aromatic hydrocarbons were easy to be removed by high-temperature co-pyrolysis.The synergistic effect of co-pyrolysis of acetic acid and sawdust was slightly weaker than that of toluene.The yield change of co-pyrolysis products affected by temperature was consistent with that of sawdust pyrolysis alone.Furthermore,the inhibitory effect of pyrolysis temperature on coke and tar was enhanced,providing a reference for tar removal and efficient conversion.