小型固定床实验台条件下的聚乙烯热解

Analysis of polyethylene pyrolysis using a bench scale fixed bed

废塑料的热解特性研究是垃圾热化学处理工艺设计的基础。该文利用小型可视化固定床对聚乙烯类塑料进行了热解实验研究,分析了废塑料的热解机理及反应过程,并结合统计理论建立了聚乙烯热解模型。实验结果表明:提高热解温度可以提高产气率、碳转化率和热效率;热解气热值随温度而变化,在973 K左右达到最大值;建立的热解模型可预测不同温度下聚乙烯热解产物分布,与化学反应动力学模型结合后可全面描述聚乙烯的热解过程。

Plastic waste pyrolysis was analyzed to provide better descriptions of thermochemical waste processing. The polyethylene （PE） pyrolysis and reaction mechanisms were investigated using a transparent bench scale fixed bed reactor to provide data for a PE pyrolysis model based on macromolecule polymer statistical theory and the experimental data. The results show that the gas field, carbon conversion rate, and energy transform efficiency improve with increasing pyrolysis temperature with the gas calorific value varying with temperature to a peak at about 973 K. The results show that the model accurately predicts PE pyrolysis product distribution for various temperatures and that the method can describe the whole pyrolysis process if combined with a chemical reaction model.