在管式炉反应器中，对纤维素（CE）与高密度聚乙烯（HDPE）进行了慢速共热解和快速共热解的研究，考察了升温速率和混合比例对CE与HDPE共热解的影响。结果表明，CE与HDPE慢速共热解可以提高液态产率，并降低气态产率和焦炭产率。在CE与HDPE比为1∶3时，慢速共热解相互作用最强烈，此时液态产率为95.4%，与计算值相比，增加了9.8%；而快速共热解降低液态产率，同时提高气态产率。在CE与HDPE比为3∶1时，快速共热解相互作用最强烈，此时液态产率与气态产率分别为49.3%和42.8%，与计算值相比，液态产率降低了14.5%，而气态产率提高了14.1%。热解油分析结果表明，CE与HDPE共热解存在协同效应，CE与HDPE共热解有利于降低液态产物的含氧量，提高焦油的质量。

Slow co-pyrolysis and fast co-pyrolysis of cellulose (CE) with high density polyethylene (HDPE) were investigated in a tube furnace reactor. The effects of heating rate and mixing ratio on the co-pyrolysis of CE and HDPE were investigated. The results show that slow co-pyrolysis of CE and HDPE can boost liquid yields while lowering gas and char yields. When the ratio of CE to HDPE is 1∶3, the slow co-pyrolysis interaction is strongest. At this ratio, the liquid yield was 95.4%. Compared with the calculated yield, the liquid yield is increased by 9.8%. Rapid co-pyrolysis reduce the liquid yield, but increase the gas yield. When the ratio of CE to HDPE is 3∶1, the rapid co-pyrolysis interaction is strongest. The liquid and gas yields were 49.3% and 42.8%, respectively. Compared with the calculated yields, the liquid yield is reduced by 14.5% but the gas yield is increased by 14.1%. These results verified that the synergistic effect existed during co-pyrolysis of CE and HDPE under the experimental conditions. Co-pyrolysis of CE and HDPE favors reducing the oxygen content of the liquid product and improving the quality of the liquid product.