RT Journal Article
T1 Validation of a biomass conversion mechanism by Eulerian modelling of a fixed-bed system under low primary air conditions
A1 Alvarez-Bermudez, Cesar
A1 Anca Couce, Andres
A1 Chapela, Sergio
A1 Scharler, Robert
A1 Buchmayr, Markus
A1 Gomez, Miguel Angel
A1 Porteiro, Jacobo
AB This work presents a three-dimensional Computational Fluid Dynamics study of a small-scale biomass combustion system operating with low primary air ratios. The Eulerian Biomass Thermal Conversion Model (EBiTCoM) was adapted to incorporate a pyrolysis mechanism based on the detailed Ranzi-Anca-Couce (RAC) scheme. Two scenarios were simulated using woodchips with 8% and 30% moisture content, and the results were validated against experimental data, including in-flame and bed measurements. The model accurately predicted bed temperature profiles and the influence of fuel moisture content on the pyrolysis and drying fronts, as well as on the distribution of volatiles and temperatures above the solid fuel bed. For the 8% moisture content case, the average gas temperature above the bed is approximately 700 degrees C, while for the 30% case, it drops to around 400 degrees C. The lower temperatures hinder the tar cracking reaction, resulting in a 25% higher tar content in the producer gas for the 30% moisture content fuel. The lower part of the bed consists of a thick layer of char undergoing reduction reactions, similar to that of an updraft gasifier. The developed model can accurately simulate biomass combustion systems with solid fuel beds consisting of numerous particles, while maintaining low computational requirements.
PB Elsevier
SN 0960-1481
YR 2023
FD 2023-10-01
LK https://hdl.handle.net/10016/39262
UL https://hdl.handle.net/10016/39262
LA eng
NO This research was funded by the project PID2021-126569OB-I00 of the Ministry of Science and Innovation (Spain). The work of César Álvarez-Bermúdez has been supported by the grant PRE2019-090110 of the Ministry of Science and Innovation (Spain). Funding for open access charge: Universidade de Vigo/CISUG.
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RD 18 jul. 2024