College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, China.
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China.
Waste Manag Res. 2020 Mar;38(3):271-278. doi: 10.1177/0734242X19877682. Epub 2019 Oct 10.
Thermal treatment offers advantages of significant volume reduction and energy recovery for the polyurethane foam from waste refrigerators. In this work, the pyrolysis kinetics of polyurethane foam was investigated using the model-fitting, model-free and distributed activation energy model methods. The thermogravimetric analysis indicated that the polyurethane foam decomposition could be divided into three stages with temperatures of 38°C-400°C, 400°C-550°C and 550°C-1000°C. Peak temperatures for the major decomposition stage (<400°C) were determined as 324°C, 342°C and 344°C for heating rates of 5, 15 and 25 K min, respectively. The activation energy () from the Friedman, Flynn-Wall-Ozawa and Tang methods increased with degree of conversion () in the range of 0.05 to 0.5. The coefficients from the Flynn-Wall-Ozawa method were larger and the resulted values fell into the range of 163.980-328.190 kJ mol with an average of 206.099 kJ mol. For the Coats-Redfern method, the diffusion models offered higher coefficients, but the values were smaller than that from the Flynn-Wall-Ozawa method. The values derived from the distributed activation energy model method were determined as 163.536-334.231 kJ mol, with an average of 206.799 kJ mol. The peak of activation energy distribution curve was located at 205.929 kJ mol, consistent with the thermogravimetric results. The Flynn-Wall-Ozawa and distributed activation energy model methods were more reliable for describing the polyurethane foam pyrolysis process.
热处置为废冰箱聚氨酯泡沫提供了显著的体积减少和能量回收的优势。在这项工作中，使用模型拟合、无模型和分布活化能模型方法研究了聚氨酯泡沫的热解动力学。热重分析表明，聚氨酯泡沫的分解可以分为三个阶段，温度分别为 38°C-400°C、400°C-550°C 和 550°C-1000°C。在加热速率为 5、15 和 25 K min 时，主要分解阶段（<400°C）的峰值温度分别确定为 324°C、342°C 和 344°C。弗林-沃勒-奥扎瓦（Flynn-Wall-Ozawa）和唐（Tang）方法的活化能（）随着转化率（）在 0.05 到 0.5 的范围内增加而增加。弗林-沃勒-奥扎瓦方法的系数较大，得到的 值落入 163.980-328.190 kJ mol 的范围内，平均值为 206.099 kJ mol。对于 Coats-Redfern 方法，扩散模型提供了更高的系数，但 值比弗林-沃勒-奥扎瓦方法小。分布活化能模型方法得到的 值为 163.536-334.231 kJ mol，平均值为 206.799 kJ mol。活化能分布曲线的峰值位于 205.929 kJ mol，与热重结果一致。弗林-沃勒-奥扎瓦和分布活化能模型方法更可靠地描述了聚氨酯泡沫的热解过程。
