Characteristics and kinetic analysis of pyrolysis of forestry waste promoted by microwave-metal interaction

Longzhi Li, Yongdong Tan, Jifu Sun, Yue Zhang, Lianjie Zhang, Yue Deng, Dongqiang Cai, Zhanlong Song, Guifu Zou and Yonghui Bai

Energy, 2021, vol. 232, issue C

Abstract: In the present work, a method of pyrolyzing forestry waste (FW) under microwave-metal interaction was proposed. The kinetic analysis of the process was carried out using a microwave thermogravimetric analyzer. The mechanism of FW pyrolysis under microwave-metal interaction was discussed from the perspective of microwave-induced metal discharge and non-discharge processes. The initial pyrolysis temperature Ti reduced, and the maximum pyrolysis rate Rm and pyrolysis characteristic index S increased by employing a method where microwave and metal were coupled. The number of metals inserted also significantly affected the pyrolysis behavior. Rm in the presence of one metal was 92.3% higher than that recorded in the absence of metal. The results of kinetic analysis revealed in the presence of metal, the activation energies at 400 W and 560 W were 51.7% and 57.5% lower, respectively, than the activation energy recorded in the absence of metal. Multiple effects of light, heat, and plasma produced by microwave-induced discharge caused the local pyrolysis of FW. The promotion of FW pyrolysis in the non-discharge stage was primarily caused by the microwave absorption of carbon into heat and the conversion of current on the metal surface into Joule heat.

Keywords: Microwave; Metal discharge; Pyrolysis; Kinetic analysis (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:232:y:2021:i:c:s0360544221013438

DOI: 10.1016/j.energy.2021.121095

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