Work

Kinetics analysis and numerical simulation of eucalyptus sawdust pyrolysis

Year: 2025

Type: article

Abstract: In this study, thermogravimetric analysis (TGA) was employed to investigate the thermal decomposition characteristics and kinetic parameters of eucalyptus sawdust at heating rates of 5, 10, 15, 20, and 30 ℃/min (20–900℃) under a nitrogen atmosphere (99.99 %, 30 mL/min). The pyrolysis process of eucalyptus sawdust was divided into three stages: drying and preheating (DH), fast weight-losing pyrolysis (FP) and carbon growing (CG). Mechanism function fitting determined that the DH and FP stages followed follow n-order reaction and Jander-type 3D diffusion, respectively. The activation energy ( E ), pre-exponential factor logarithm (lg A ) and reaction order ( n ) of the DH and FP stages are 82.42 and 143.40 kJ/mol, 10.77 and 9.00 s −1 , and 2.58 and 2.00, respectively. The results are highly consistent with the E and lg A values estimated by FWO and Friedman methods in the conversion rate ( α ) range of 0.2–0.8. For the CG stage, a new reaction process fitting equation ( ) was developed by numerical simulation of fitting α , temperature ( T ) and heating rate (β ). The high coefficient of determination (R 2 >0.9700) confirms the equation's reliability. This study provides crucial theoretical support for optimizing the pyrolysis process of eucalyptus sawdust and guiding the reactor design.

Source: Industrial Crops and Products

DOI: 10.1016/j.indcrop.2025.122045

Authors: Zepeng Cheng, Zhiwen Chen, Mingfeng Wang, Yongzhi Ren, Ke Zhang

Institutions: Anhui Agricultural University, China Resources (China), South China Agricultural University, Novozymes (United States)

Language: English

Topic: Thermochemical Biomass Conversion Processes

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: gold

Estimated APC paid: $3,720