Abstract Thermal pyrolysis of three automobile tyre waste (ATW’s) - light vehicle tyre (LVT), medium vehicle tyre (MVT) and heavy vehicle tyre (HVT), was investigated in a thermogravimetric analyser and a batch reactor. Such investigations on the effect of the fractions of natural and synthetic rubbers on product yield and the type of tyres on the pyrolysis process and products have not reported in the literature. The product yields were influenced strongly by the reactor temperature with higher temperature favouring the formation of more gases and more char being formed at lower temperatures. The range of degradation temperature was found to be the smallest for LVT as it contained mostly natural rubber (NR), while it was the largest for HVT due to the presence of NR and synthetic butyl rubber(SBR), having widely different degradation temperatures. In the batch reactor, maximum liquid yields of 51%, 45% and 63.5% were obtained for LVT, MVT and HVT at the optimum temperatures of 650 °C, 750 °C and 750 °C respectively at a heating rate of 20 °C/min. The oil obtained from LVT shows high aromatic content while the oil from MVT and HVT has a high presence of napthelinic component. The reactor pressure profile showed that the LVT started producing the non-condensable gaseous fraction earliest due to faster degradation. More secondary reactions for MVT generated more gases, leading to the highest final reactor pressure and high concentration of non condensable gases. Gas chromatographic (GC) analysis indicated that H2, CO, CO2, CH4, C2, C3H8 and C4 were the main gases obtained for all type of tyre wastes. Cracking of heavier hydrocarbons to the lighter ones and H2 was more dominant in MVT, while this was least prominent in HVT, producing less H2 and added oil. The activation energies for the pyrolysis reaction of LVT, MVT and HVT wastes were estimated to be 53.185, 62.489 and 64.574 kJ/mol respectively.

中文翻译：

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三种不同类别的汽车轮胎废料的热解：产品产量分析和表征

摘要 在热重分析仪和间歇反应器中研究了三种汽车轮胎废料 (ATW) - 轻型汽车轮胎 (LVT)、中型汽车轮胎 (MVT) 和重型汽车轮胎 (HVT) 的热解。关于天然和合成橡胶的分数对产品产率和轮胎类型对热解过程和产品的影响的研究尚未在文献中报道。产物产率受反应器温度的强烈影响，较高的温度有利于在较低温度下形成更多的气体和更多的炭。发现 LVT 的降解温度范围最小，因为它主要包含天然橡胶 (NR)，而 HVT 的降解温度范围最大，因为 NR 和合成丁基橡胶 (SBR) 的降解温度差异很大。在间歇式反应器中，LVT、MVT 和 HVT 在最佳温度 650 °C、750 °C 和 750 °C 下，在 20 °C 的加热速率下分别获得 51%、45% 和 63.5% 的最大液体产率/分钟。从 LVT 获得的油显示出高芳烃含量，而从 MVT 和 HVT 获得的油具有高萘烷组分。反应器压力曲线显示 LVT 最早开始产生不凝气态部分，因为降解速度更快。MVT 的更多二次反应产生更多气体，导致最高的最终反应器压力和高浓度的不可凝气体。气相色谱 (GC) 分析表明，H2、CO、CO2、CH4、C2、C3H8 和 C4 是所有类型轮胎废物获得的主要气体。重烃裂解为轻烃和 H2 在 MVT 中占主导地位，而这在 HVT 中最不突出，产生较少的 H2 和添加的油。LVT、MVT 和 HVT 废物热解反应的活化能估计分别为 53.185、62.489 和 64.574 kJ/mol。