Pyrolysis is a promising method of chemically recycling plastic waste, as it allows for the recovery of both energy and materials. In this work, a comprehensive mathematical model has been developed to predict the pyrolysis of plastic wastes over ZSM-5 catalyst in microwave-assisted pyrolysis (MAP) system for fuel production. To conduct a transient numerical analysis of the underlying processes, a lumped kinetic model that takes into account three lumped pyrolysis products (olefins, paraffins, and aromatics) is coupled with the equations that govern the microwave field, heat transfer, mass transfer, and fluid flow (Darcy's law). The distributions of electric field, temperature, and pyrolysis products within MAP are presented. The study investigated the effects of several factors on the rate of production and consumption in the pyrolysis reactions of a waste plastic mixture when using MAP. These factors include the microwave power input, the inlet velocity of the fluidizing gas, as well as the mass and particle size of the catalyst used. Increasing the input power leads to a higher intensity of the electric field, which causes a greater increase in temperature within the same time frame. The mass and particle size of the catalyst used also have a significant impact on the yield of olefins, paraffins, and aromatics. Reducing the particle size of the catalyst generally increases the reaction rate, but particle sizes smaller than 50 μm are not ideal for fluidization due to increased intermolecular forces. Increasing the inlet velocity of the fluidizing gas may result in an incomplete consumption of intermediates and a low yield of products. All in all, The MAP system is a highly efficient and effective design for using plastic waste as a source of energy, due to its superior energy efficiency and lower processing temperature compared to traditional fluidized-bed reactors.

热解是一种很有前途的化学回收塑料废物的方法，因为它可以回收能源和材料。在这项工作中，开发了一个综合数学模型来预测用于燃料生产的微波辅助热解 (MAP) 系统中 ZSM-5 催化剂上塑料废物的热解。为了对基础过程进行瞬态数值分析，考虑了三种集总热解产物（烯烃、石蜡和芳烃）的集总动力学模型与控制微波场、传热、传质和流体的方程相结合流量（达西定律）。给出了 MAP 内电场、温度和热解产物的分布。该研究调查了使用 MAP 时废塑料混合物热解反应中几个因素对生产速率和消耗速率的影响。这些因素包括微波功率输入、流化气体的入口速度以及所用催化剂的质量和颗粒尺寸。增加输入功率会导致电场强度更高，从而导致相同时间范围内温度升高更大。所用催化剂的质量和粒度对烯烃、链烷烃和芳烃的产率也有显着影响。减小催化剂的粒径通常会提高反应速率，但小于 50 μm 的粒径由于分子间作用力增加，对于流化来说并不理想。增加流化气体的入口速度可能导致中间体消耗不完全和产物收率低。总而言之，与传统流化床反应器相比，MAP 系统具有卓越的能源效率和更低的加工温度，是一种利用塑料废物作为能源的高效且有效的设计。