Abstract Microwave power and the susceptor quantity are important operating parameters in the microwave-assisted pyrolysis. This work aims at finding the optimal power and susceptor quantity from a discrete set of microwave powers (300 W, 450 W, and 600 W) and graphite susceptor quantity (50 g, 200 g, and 350 g) to pyrolyze waste polypropylene. The effect of microwave power and the susceptor quantity on heating rate, conversion efficiency, and heat losses in pyrolysis were analyzed using a central composite design (CCD). It was observed that a higher microwave power and lower susceptor quantity yielded higher heating rates, and lower heating rates were obtained for a lower microwave power and higher susceptor quantity. For example, a very low heating rate, averaging to 8.5 °C/min was obtained for a low microwave power (300 W) and a high susceptor quantity (350 g), whereas high values of heating rate (71.7 °C/min) were obtained for a microwave power of 600 W with 50 g of susceptor quantity. For a set of microwave powers considered in this study, it was observed that the required bed temperatures were acquired faster at a low susceptor quantity compared to high susceptor quantity. The oil produced from the pyrolysis of WPP has a high heating value of 44 MJ/kg and the carbon number distribution in the range of C8 to C12. The char produced has rich carbon content (96 wt.%) and a high specific surface area (195 m2/g). Cyclo alkenes with a selectivity of 70% and monocyclic hydrocarbons with a selectivity of 49.6 % were produced at 450 W and 600 W powers respectively for a susceptor quantity of 50 g. From this study, it is found that the microwave power and susceptor quantity are the important parameters for minimizing the microwave energy requirement in the pyrolysis. The low susceptor quantity and high microwave power were found to be the best for achieving fast heating rates and low energy requirements. The microwave power significantly playing a vital role in the polypropylene pyrolysis product spectrum for value-added hydrocarbons.

中文翻译：

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废聚丙烯微波热解微波功率和石墨基座数量的优化

摘要 微波功率和基座数量是微波辅助热解的重要操作参数。这项工作旨在从一组离散的微波功率（300 W、450 W 和 600 W）和石墨感受器数量（50 克、200 克和 350 克）中找到最佳功率和感受器数量，以热解废聚丙烯。使用中心复合设计 (CCD) 分析了微波功率和感受器数量对加热速率、转化效率和热解热损失的影响。观察到较高的微波功率和较低的感受器数量产生较高的加热速率，并且较低的微波功率和较高的感受器数量获得较低的加热速率。例如，加热速率非常低，平均为 8。低微波功率 (300 W) 和高基座量 (350 g) 的加热速率为 5 °C/min，而 600 W 的微波功率和 50 g 的感受器数量。对于本研究中考虑的一组微波功率，观察到与高感受器数量相比，在低感受器数量下获得所需的床温度更快。WPP 热解产生的油具有 44 MJ/kg 的高热值和 C8 至 C12 范围内的碳数分布。产生的炭具有丰富的碳含量（96 wt.%）和高比表面积（195 m2/g）。分别在 450 W 和 600 W 的功率下，对于 50 g 的感受器，产生了选择性为 70% 的环烯烃和选择性为 49.6% 的单环烃。从这项研究中，发现微波功率和感受器数量是使热解中微波能量需求最小化的重要参数。发现低感受器数量和高微波功率是实现快速加热速率和低能量需求的最佳选择。微波功率在高附加值碳氢化合物的聚丙烯热解产物谱中起着至关重要的作用。