Journal
COMPUTATIONAL PARTICLE MECHANICS
Volume 9, Issue 6, Pages 1319-1335Publisher
SPRINGER INT PUBL AG
DOI: 10.1007/s40571-022-00467-9
Keywords
Discrete element method; Bonded particle method; Microscale model; Gasification; Devolatilisation; Wood pellets; Fragmentation
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [DO 2026/5-1, HE 4526/21-1]
- Projekt DEAL
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By extending the bonded particle method, it is possible to study and predict the behavior of a single pellet during conversion inside a fluidized bed gasification reactor in more detail. The implemented particle-based pyrolysis model enables accurate prediction of the pellet's kinetics and mechanical behavior.
By extending the bonded particle method, the major structural changes during the devolatilization of a wood pellet in a fluidized bed and the resulting mechanical behavior have been successfully reproduced. A comparison with experiments from the literature showed that the implemented particle-based pyrolysis model enables predicting the entire pellet's kinetics with a high agreement. The developed shrinkage model for the particles and bonds further allowed to emulate the reported formation of a large-scale pore network inside the pellet. The simulation of a radial compression test with the predicted structure showed good agreement with experimental data and could confirm the importance of the pores for the mechanical behavior. The results demonstrated that the large pores cause the fragmentation of agglomerates already at low mechanical loads which could promote attrition. In general, the results have shown that the developed extension of the bonded particle method allows studying and predicting the behavior of a single pellet during conversion inside a fluidized bed gasification reactor in more detail.
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