1. Isoconversional determination of the apparent reaction models governing pyrolysis of wood, straw and sewage sludge, with an approach to rate modelling.
- Author
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Sobek, Szymon and Werle, Sebastian
- Subjects
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SEWAGE sludge , *WOOD waste , *STRAW , *ACTIVATION energy , *BIOMASS - Abstract
Within the presented paper, different approaches to determine kinetic reaction models governing pyrolysis of three waste biomass types: waste wood (WW), waste straw (WS) and sewage sludge (SS) based on 5 dynamic heating runs (5, 10, 20, 30, 40 K/min) at TGA are presented and discussed. Fuel properties with lignocelluloses content of the investigated feedstock are presented and discussed. Ambiguous results of the generalized master-plot method draw the idea of determining actual reaction models using the isoconversional methodology. Friedman method provided apparent activation energies as a root for further calculations being the 48.1–294.3 kJ/mol for WS, 21.0–361.9 kJ/mol for WW and 58.1–484.3 kJ/mol for SS. Isoconversional pre-exponential factors were determined using linear compensation effect and were 7.2·106–1.8·1021 1/min, 1.6·104–1.2·1025 1/min, and 1.5·109–3.2·1030 1/min for WS, WW, and SS respectively. Based on isoconversional parameters, actual profiles of reaction models were estimated using the t-Students distribution for 95% confidence intervals and verified in the modelling of pyrolysis conversion profiles. Isoconversional pyrolysis models resulted in fitting to experimental profiles with non-linear coefficients of determination equal to 0.9912, 0.9876, and 0.9406 for WW, WS, and SS respectively. • Isoconversional f(α) for pyrolysis of WW, WS and SS are estimated for dynamic TGA. • A α were determined using compensation effect and E α with Friedman method. • Isoconversional kinetics resulted in fitting with R 2 0.99, 0.99, and 0.94. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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