The Development of a Kinetic Model for Biochar Gasification with CO<sub>2</sub>: Comparison Between a Thermogravimetric Analyzer and a Fluidized Bed Reactor
This study presents the development of a kinetic model for the gasification of biochar with carbon dioxide and compares the results obtained using a thermogravimetric analyzer (TGA) and a fluidized bed reactor (FBR). The kinetic experiments investigated the effects of the CO<sub>2</sub>...
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MDPI AG
2025-05-01
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| author | Luis Reyes Michael Jabbour Lokmane Abdelouahed Bechara Taouk |
| author_facet | Luis Reyes Michael Jabbour Lokmane Abdelouahed Bechara Taouk |
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| description | This study presents the development of a kinetic model for the gasification of biochar with carbon dioxide and compares the results obtained using a thermogravimetric analyzer (TGA) and a fluidized bed reactor (FBR). The kinetic experiments investigated the effects of the CO<sub>2</sub> partial pressure (0.33–1 atm), temperature (800–1000 °C), and CO<sub>2</sub>/C ratio (3.5–10.5). Three structural models, the shrinking core model (SCM), volumetric model (VM), and power-law model (PLM), were evaluated for their ability to predict experimental results. The results demonstrated that increasing the temperature, CO<sub>2</sub> partial pressure, and CO<sub>2</sub>/C ratio enhanced the gasification rate, reducing the time required for complete biochar conversion. The apparent activation energy for both reactors was similar (156–159 MJ/kmol), with reaction orders of 0.4–0.49. However, the kinetic models varied significantly between setups. In the TGA, the PLM provided the best fit to experimental data, with standard deviations of 2.6–9%, while in the FBR, the SCM was most accurate, yielding an average deviation of 1.5%. The SCM effectively described the layer-by-layer char consumption, where gasification slowed at high conversion levels. Conversely, the PLM for the TGA revealed a unique mathematical function not aligned with traditional models, indicating localized reaction behaviors. This study highlights the inability to directly extrapolate TGA-derived kinetic models to FBR systems, underscoring the distinct mechanisms governing char consumption in each reactor type. These findings provide critical insights for optimizing biochar gasification across diverse reactor configurations. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-05-01 |
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| series | Fuels |
| spelling | doaj-art-3b1f5dc53df1404e9e10bbc3e1ea8caa2025-08-20T03:27:18ZengMDPI AGFuels2673-39942025-05-01623410.3390/fuels6020034The Development of a Kinetic Model for Biochar Gasification with CO<sub>2</sub>: Comparison Between a Thermogravimetric Analyzer and a Fluidized Bed ReactorLuis Reyes0Michael Jabbour1Lokmane Abdelouahed2Bechara Taouk3Laboratoire de Sécurité des Procédés Chimiques, LSPC EA-4704, INSA Rouen Normandie, Normandie University, UNIROUEN, 76000 Rouen, FranceLaboratoire de Sécurité des Procédés Chimiques, LSPC EA-4704, INSA Rouen Normandie, Normandie University, UNIROUEN, 76000 Rouen, FranceLaboratoire de Sécurité des Procédés Chimiques, LSPC EA-4704, INSA Rouen Normandie, Normandie University, UNIROUEN, 76000 Rouen, FranceLaboratoire de Sécurité des Procédés Chimiques, LSPC EA-4704, INSA Rouen Normandie, Normandie University, UNIROUEN, 76000 Rouen, FranceThis study presents the development of a kinetic model for the gasification of biochar with carbon dioxide and compares the results obtained using a thermogravimetric analyzer (TGA) and a fluidized bed reactor (FBR). The kinetic experiments investigated the effects of the CO<sub>2</sub> partial pressure (0.33–1 atm), temperature (800–1000 °C), and CO<sub>2</sub>/C ratio (3.5–10.5). Three structural models, the shrinking core model (SCM), volumetric model (VM), and power-law model (PLM), were evaluated for their ability to predict experimental results. The results demonstrated that increasing the temperature, CO<sub>2</sub> partial pressure, and CO<sub>2</sub>/C ratio enhanced the gasification rate, reducing the time required for complete biochar conversion. The apparent activation energy for both reactors was similar (156–159 MJ/kmol), with reaction orders of 0.4–0.49. However, the kinetic models varied significantly between setups. In the TGA, the PLM provided the best fit to experimental data, with standard deviations of 2.6–9%, while in the FBR, the SCM was most accurate, yielding an average deviation of 1.5%. The SCM effectively described the layer-by-layer char consumption, where gasification slowed at high conversion levels. Conversely, the PLM for the TGA revealed a unique mathematical function not aligned with traditional models, indicating localized reaction behaviors. This study highlights the inability to directly extrapolate TGA-derived kinetic models to FBR systems, underscoring the distinct mechanisms governing char consumption in each reactor type. These findings provide critical insights for optimizing biochar gasification across diverse reactor configurations.https://www.mdpi.com/2673-3994/6/2/34biochar gasificationkinetic modelingfluidized bed reactorthermogravimetric analyzercarbon dioxide utilization |
| spellingShingle | Luis Reyes Michael Jabbour Lokmane Abdelouahed Bechara Taouk The Development of a Kinetic Model for Biochar Gasification with CO<sub>2</sub>: Comparison Between a Thermogravimetric Analyzer and a Fluidized Bed Reactor Fuels biochar gasification kinetic modeling fluidized bed reactor thermogravimetric analyzer carbon dioxide utilization |
| title | The Development of a Kinetic Model for Biochar Gasification with CO<sub>2</sub>: Comparison Between a Thermogravimetric Analyzer and a Fluidized Bed Reactor |
| title_full | The Development of a Kinetic Model for Biochar Gasification with CO<sub>2</sub>: Comparison Between a Thermogravimetric Analyzer and a Fluidized Bed Reactor |
| title_fullStr | The Development of a Kinetic Model for Biochar Gasification with CO<sub>2</sub>: Comparison Between a Thermogravimetric Analyzer and a Fluidized Bed Reactor |
| title_full_unstemmed | The Development of a Kinetic Model for Biochar Gasification with CO<sub>2</sub>: Comparison Between a Thermogravimetric Analyzer and a Fluidized Bed Reactor |
| title_short | The Development of a Kinetic Model for Biochar Gasification with CO<sub>2</sub>: Comparison Between a Thermogravimetric Analyzer and a Fluidized Bed Reactor |
| title_sort | development of a kinetic model for biochar gasification with co sub 2 sub comparison between a thermogravimetric analyzer and a fluidized bed reactor |
| topic | biochar gasification kinetic modeling fluidized bed reactor thermogravimetric analyzer carbon dioxide utilization |
| url | https://www.mdpi.com/2673-3994/6/2/34 |
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