Characteristics and kinetic analysis of pyrolysis of forestry waste promoted by microwave-metal interaction. (1st October 2021)

• Record Type: Journal Article
• Authors: Li, Longzhi; Tan, Yongdong; Sun, Jifu; Zhang, Yue; Zhang, Lianjie; Deng, Yue; Cai, Dongqiang; Song, Zhanlong; Zou, Guifu; Bai, Yonghui
• Is Part Of: Energy. Volume 232(2021)
• Publication Date: 2021-10-01
• Subjects: Microwave -- Metal discharge -- Pyrolysis -- Kinetic analysis; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2021.121095
• Languages: English
• ISSNs: 0360-5442

Abstract

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 T i reduced, and the maximum pyrolysis rate R m 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. R m 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. Graphical abstract: Image 1 Highlights: Biomass pyrolysis exploiting microwave-metal interaction has been proposed. Kinetic analysis was conducted using a microwave thermogravimetric analyzer. The number of metals inserted significantly influenced the pyrolysis behavior. The maximum pyrolysis rate increased by microwave-metal interaction. Activation energy in the presence of one metal was the lowest.