Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser
Article
Nath, Bidhan, Chen, Guangnan, Bowtell, Les and Graham, Elizabeth. 2023. "Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser." Heliyon. 9 (10). https://doi.org/10.1016/j.heliyon.2023.e20602
| Article Title | Kinetic mechanism of wheat straw pellets combustion process with a thermogravimetric analyser |
|---|---|
| ERA Journal ID | 212685 |
| Article Category | Article |
| Authors | Nath, Bidhan, Chen, Guangnan, Bowtell, Les and Graham, Elizabeth |
| Journal Title | Heliyon |
| Journal Citation | 9 (10) |
| Article Number | e20602 |
| Number of Pages | 17 |
| Year | 2023 |
| Publisher | Elsevier |
| Place of Publication | United Kingdom |
| ISSN | 2405-8440 |
| Digital Object Identifier (DOI) | https://doi.org/10.1016/j.heliyon.2023.e20602 |
| Web Address (URL) | https://www.cell.com/heliyon/fulltext/S2405-8440(23)07810-6 |
| Abstract | In this study, the combustion characteristics of two wheat straw pellets (WSP) (T1: 100% wheat straw and T5: 70% wheat straw; 10% sawdust, 10% biochar; 10% bentonite clay) were performed at a heating rate 20 °C/min under a temperature from 25 to 1200 °C in air atmosphere. A thermogravimetric analyser (TGA) was used to investigate the activation energy (Eα), pre-exponential factor (A), and thermodynamic parameters. The DTG/TG profile of WSP was evaluated by model-free and model-based methods and found the model-based method was suitable for WSP thermal characterisation. The result demonstrates that the thermal decomposition occurred in four stages, comprising four consecutive reaction steps. A→B→C→D→E→F. Further, the model-based techniques were best fitted with kinetic reaction models like Cn (nth-order reaction with auto-catalyst), Fn (reaction of nth order), F2 (second-order phase interfacial reaction) and D3 (diffusion control). The average Eα for Fn, Cn, D3 and F2 models were 164.723, 189.782, 273.88, and 45.0 kJ/mol, respectively, for the T1 pellets. Alternatively, for T5 pellets, the A was 1.17E+2, 1.76E+16, 5.5E+23, and 1.1E+3 (1/s) for F2, D3, Cn and Fn models. Overall, the thermodynamic properties showed that WSP thermokinetic reactions were complex and multi-point equilibrium, indicating a potentiality as a bioenergy feedstock. |
| Keywords | Combustion; Wheat straw pellet ; Thermogravimetric analyser ; Derivative thermogravimetric analysis ; Heating rate ; Model-based methods |
| ANZSRC Field of Research 2020 | 300405. Crop and pasture biomass and bioproducts |
| 401102. Environmentally sustainable engineering | |
| Byline Affiliations | School of Agriculture and Environmental Science |
| School of Engineering | |
| Queensland University of Technology |
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