Title:
Development of a Novel Three-stage Fluidized Bed Gasifier with a Low Tar Content and High Quality Product Gas
Author(s):
Anca-Couce, A., Graul, T., Bertus, T., Guil-Pedrosa, J.F., García-Gutiérrez, L.M., Cano-Pleite, E., Soria-Verdugo, A.
Document(s):
Paper
Abstract:
Dual fluidized bed gasification with steam is a promising biomass conversion technology, leading to a high-quality product gas that can be employed for producing advanced biofuels. However, in all demonstration activities the high tar content of this technology was a main drawback. Therefore, in this work an innovative design of a 3-stage gasifier for in bed tars reduction is presented and developed, including a top bubbling fluidized bed for tar removal above the gasifier. The innovative concept proposed in this work allows a significant reduction of the tar content in the product gas, notably below the typical tar content of fluidized bed gasifiers, while maintaining a compact design capable of operating with a moderate and steady pressure drop. Numerical simulations using MFiX-CGP and source terms replicating the gasification and combustion endothermic and exothermic energy sources reveal a successful particle circulation in the 3-stage reactor, reaching temperature differences in the bottom and top reactors compatible with the necessary temperatures required for a stable operation of the device. Experiments were conducted in a 2-stage fixed-bed system as proof of concept and in a 2-stage fluidized bed system as experimental validation. The experimental results reveal that both secondary reactors are capable of reducing the tar content of the producer gas at temperatures that can be achieved in the 3-stage novel concept, increasinsg as well the hydrogen content due to enhanced water-gas-shift reactions. Therefore, the proposed 3-stage concept can lead to a high quality product gas.
Keywords:
gasification, product gas, tar, fluidized bed
Topic:
Biomass Conversion for Bioenergy
Subtopic:
Gasification for synthesis gas production
Event:
33rd European Biomass Conference and Exhibition
Session:
4AO.8.3
Pages:
653 - 657
ISBN:
978-88-89407-25-7
Paper DOI:
10.5071/33rdEUBCE2025-4AO.8.3
Price:
FREE
