Numerical study on the role of microwave-metal discharge in microwave pyrolysis of WPCBs
作者机构：National Engineering Laboratory for Reducing Emissions from Coal CombustionEngineering Research Center of Environmental Thermal Technology of Ministry of EducationShandong Key Laboratory of Energy Carbon Reduction and Resource UtilizationSchool of Energy and Power EngineeringShandong UniversityJinanChina Key Laboratory of the Wireless Power TransferCollege of Electronic and Information EngineeringSichuan UniversityChengduChina
出 版 物：《Waste Disposal and Sustainable Energy》 (废弃物处置与可持续能源（英文）)
年 卷 期：2021年第3卷第3期
页 面：185-200页
核心收录：
学科分类：080904[工学-电磁场与微波技术] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学]
基 金：The authors thank the support of the Young Scholars Program of Shandong University(2018WLJH75) Natural Science Foundation of Shandong Province(ZR2019MEE035) International Clean Energy Talent Program(iCET 2019)
主 题：Microwave heating Electric discharge Hot-spot effect E-waste Pyrolysis
摘 要：As a promising green technology,microwave heating is highlighted by its high efficiency and low consumption,especially in the fast pyrolysis treatment for e-waste *** discharge induced by microwave-metal interaction plays a significant role in the process,and its contribution to heat generation is,however,always hard to define qualitatively through direct *** this simulation,a microwave heating model featuring the pulsed microwave-metal(MW-m)discharge was designed in multi-dimensions,using COMSOL Multiphysics software,to emphatically probe the depth and extent of the hot-spot effect as well as its auxo-action on the pyrolysis process of waste printed circuit boards(WPCBs).The energy loss generated by MW-m discharge was added into the models in the form of a built-in fluctuating heat source,and it is found that at a relatively low microwave energy-to-heat conversion rate(31.5%,220.5 W),due to the unique thermal effect of microwave-metal discharge,it can achieve an ideal pyrolysis *** on the results,the instantaneous heat by discharge is generated in the similar trend of radiation pulses,and the local temperature of discharge spots can reach more than 2000 K the instant the discharge occurs,shortening the overall pyrolysis from dozens of minutes to around 200 s.
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