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A fast heating-rate thermogravimetric study of the pyrolysis of scrap tyres

机译：废轮胎热解的快速升温速率热重研究

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摘要

Pyrolysis of scrap tyres has been investigated by means of non-isothermal thermogravimetric analysis, at heating rates ranging from 5 to 900deg.C/min and particle sizes of l and 3 mm. The occurrence of primary and secondary pyrolysis stages has been recognized at low heating rates. Based on experimental findings and on the relevant literature on pyrolysis of rubber components, a series--parallel reaction network and a idnetic model are proposed. Accordingly, the first stage of weight loss is related to depolymerization of the rubber components. The residue, upon cyclization and crosslinKing, degrades in the secondary stage at larger temperatures. Kinetic parameters of primary and secondary pyrolysis and of the cyclization/crosslinking stages are determined on the basis of experimental results obtained under chemical kinetic controlled pyrolysis conditions. At large heating rates distinction between primary and secondary pyrolysis is no longer observed and a single peak of the pyrolysis rate is observed. This phenomenology can be partly related to decreasing extent of cyclization/crosslinking that take place as the heating rate is raised. Moreover, radial non-uniformities of either temperature, overall volatile pressure or concentration can be established at larger heating rates. These can be further responsible for the modification of the pyrolysis pattern.
机译：已经通过非等温热重分析研究了废轮胎的热解，其加热速率为5至900℃/ min，粒径为1和3 mm。已经认识到在低加热速率下一级和二级热解阶段的发生。根据实验结果和有关橡胶组分热解的相关文献，提出了串并联反应网络和内定模型。因此，减重的第一阶段与橡胶组分的解聚有关。在环化和交联时，残留物在较高温度下的次级阶段降解。基于在化学动力学控制的热解条件下获得的实验结果，确定一级和二级热解的动力学参数以及环化/交联阶段的动力学参数。在大的加热速率下，不再观察到一级和二级热解之间的区别，并且观察到了一个单峰的热解速率。这种现象学可能部分与随着加热速率提高而发生的环化/交联程度的降低有关。而且，可以在较大的加热速率下建立温度，总挥发性压力或浓度的径向不均匀性。这些可能进一步导致热解模式的改变。

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