Modeling of a fluidized bed gasifier with computational fluid dynamics (CFD) and thermodynamic equilibrium approach and comparative analysis with experimental data Akışkan yataklı bir gazlaştırıcının hesaplamalı akışkanlar dinamiği (HAD) ve termodinamik denge yaklaşımı ile modellenmesi ve deneysel verilerle karşılaştırmalı olarak incelenmesi

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Yazgı M., TOPAL H.

Journal of the Faculty of Engineering and Architecture of Gazi University, cilt.39, sa.1, ss.125-137, 2023 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 39 Sayı: 1
  • Basım Tarihi: 2023
  • Doi Numarası: 10.17341/gazimmfd.722335
  • Dergi Adı: Journal of the Faculty of Engineering and Architecture of Gazi University
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Art Source, Compendex, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.125-137
  • Anahtar Kelimeler: Biomass, CFD, Fluidized bed, Gasification, Thermodynamic Equilibrium
  • Gazi Üniversitesi Adresli: Evet

Özet

In this study, the gasification process, which was carried out experimentally with rice husk, was modeled by Computational Fluid Dynamics (CFD) and Thermodynamic Equilibrium Approach and gas product compositions were determined. Better results were obtained in terms of all components in the modeling with CFD. As seen in Figure A, the CFD method is a method that takes into account both operating time and reactor hydrodynamics. It has been seen that the CFD approach is a more useful and appropriate approach in design, scale-up and optimization studies (Figure Presented). Purpose: Computational fluid dynamics and thermodynamic equilibrium approaches in gasifier modeling are comparatively examined by using experimental data. Theory and Methods: In this study, a previously experimental gasifier is modeled in 2D with computational fluid dynamics. The same data were modeled with the thermodynamic equilibrium approach and the results of both models were compared with the experimental data. The temperature was kept in the range of 750 – 900, °C the equivalence ratio (ER) was in the range of 0.3-0.45 and the Vapor/Biomass ratio (S/B) was kept in the range of 0.2-1. Results: As the temperature increases, H2 composition increases from 12.84% to 14%, CO composition increases from 10.62% to 13.31%, but CO2 composition decreased from 20.15% to 17.8%. As the ER value increases, the H2 CO and CH4 compositions decreased to 8.73%, 9.22% and 0.68% respectively. The increase in the S/B ratio, on the other hand, increased the H2, CO2 and CH4 composition, while decreased the CO composition. Conclusion: Considering the whole product composition, it was determined that the CFD approach gave closer results to the experimental data compared to the Thermodynamic Equilibrium Approach, the Thermodynamic Equilibrium Approach did not give good results in terms of H2 and CH4 composition. As a result of these results, it has been seen that the CFD approach is a more useful and appropriate approach in design, scale-up and optimization studies.