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首页> 外文期刊>Fuel >Kinetics underpinning the C-CO_2 gasification of waste tyre char and its interaction with coal char upon co-gasification
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Kinetics underpinning the C-CO_2 gasification of waste tyre char and its interaction with coal char upon co-gasification

机译：废轮胎焦炭气化的动力学及其在共气化过程中与煤焦的相互作用

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This study includes a thorough investigation of the char structure, the potential catalytic influence of minerals, the carbon conversion rate, the kinetic behavior and parameters of the CO2 - gasification reaction for waste scrap tyre char and its blends with coal chars. Kinetic modelling was also attempted based on the two classical methods, random pore model (RPM) and grain model (GM) using the isothermal gasification results collected from thermogravimetric analysis (TGA). As has been found, tyre char is characterised with a macroporous structure with a very low reactivity. The catalytic role of the inherent minerals within tyre char is only influential at lower temperatures below similar to 1373 K. As opposed to the generally assumed first order reaction, the tyre char exhibits a reaction order between 0.62 (for an intrinsic reaction at 1273 K) and 0.92 referring to a dominant diffusion control at 1573 K. The slow intrinsic reaction rate of tyre char was also found to be comparable with the gas diffusion rate, thereby exhibiting a large activation energy of 174.87 kJ/mol that is considerably higher than coal chars. The coal char - tyre char blends displayed declining reactivity with increasing tyre char content, due to the enhanced ash melting and diffusion against the inward gas diffusion towards the unreacted carbon that is encapsulated inside. This was further explained by the experiments of blending tyre char ash with coal chars, and the observation of ash residues collected from the gasification of blends. Furthermore, the grain model was found more suitable to fit the blending conversion data, agreeing with the hypothesised molten ash layer surrounding the unreacted char blend.
机译：这项研究包括对废轮胎轮胎炭及其与煤焦的共混物的炭结构，矿物的潜在催化影响，碳转化率，动力学行为和CO2气化反应的参数进行了深入研究。还使用从热重分析（TGA）收集的等温气化结果，基于两种经典方法，即随机孔模型（RPM）和晶粒模型（GM），尝试进行动力学建模。如已经发现的，轮胎炭的特征在于具有非常低的反应性的大孔结构。轮胎炭中固有矿物质的催化作用仅在低于类似于1373 K的较低温度下有影响。与通常假定的一阶反应相反，轮胎炭表现出的反应阶数为0.62（对于固有反应为1273 K） ；以及0.92表示1573 K处的主要扩散控制。轮胎炭的慢本征反应速率也可与气体扩散速率相媲美，从而表现出174.87 kJ / mol的大活化能，远高于煤焦。 。由于增强的灰分熔化和扩散防止了向内气体向封装在内部的未反应碳的扩散，煤焦炭-轮胎焦炭混合物的反应性随轮胎炭含量的增加而下降。通过将轮胎炭灰与煤炭混合的实验，以及从混合物气化中收集到的灰渣的观察，可以进一步解释这一点。此外，发现晶粒模型更适合拟合共混转化数据，与未反应的焦炭混合物周围的假定熔融灰分层相符。

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