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Assessment of the rice husk lean-combustion in a bubbling fluidized bed for the production of amorphous silica-rich ash

Author

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  • Martínez, Juan Daniel
  • Pineda, Tatiana
  • López, Juan Pablo
  • Betancur, Mariluz

Abstract

Rice husk lean-combustion in a bubbling and atmospheric fluidized bed reactor (FBR) of 0.3m diameter with expansion to 0.4m in the freeboard zone and 3m height was investigated. Experiment design – response surface methodology (RSM) – is used to evaluate both excess air and normal fluidizing velocity influence (independent and controllable variables), in the combustion efficiency (carbon transformation), bed and freeboard temperature and silica content in the ashes. Hot gases emissions (CO2, CO and NOx), crystallographic structure and morphology of the ash are also shown. A cold fluidization study is also presented. The values implemented in the equipment operation, excess air in the range of 40–125% and normal fluidization velocities (0.13–0.15Nm/s) show that the values near the lower limit, encourage bed temperatures around 750°C with higher carbon transformation efficiencies around 98%. However, this condition deteriorated the amorphous potential of silica present in the ash. An opposite behavior was evidenced at the upper limit of the excess air. This thermochemical process in this type of reactor shows the technical feasibility to valorize RH producing hot gases and an amorphous siliceous raw material.

Suggested Citation

  • Martínez, Juan Daniel & Pineda, Tatiana & López, Juan Pablo & Betancur, Mariluz, 2011. "Assessment of the rice husk lean-combustion in a bubbling fluidized bed for the production of amorphous silica-rich ash," Energy, Elsevier, vol. 36(6), pages 3846-3854.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:6:p:3846-3854
    DOI: 10.1016/j.energy.2010.07.031
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    Citations

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    Cited by:

    1. Steven, Soen & Restiawaty, Elvi & Bindar, Yazid, 2021. "Routes for energy and bio-silica production from rice husk: A comprehensive review and emerging prospect," Renewable and Sustainable Energy Reviews, Elsevier, vol. 149(C).
    2. Bessa, Larissa C.B.A. & Ferreira, M.C. & Batista, Eduardo A.C. & Meirelles, Antonio J.A., 2013. "Performance and cost evaluation of a new double-effect integration of multicomponent bioethanol distillation," Energy, Elsevier, vol. 63(C), pages 1-9.
    3. Hu, Ming-Che & Huang, An-Lei & Wen, Tzai-Hung, 2013. "GIS-based biomass resource utilization for rice straw cofiring in the Taiwanese power market," Energy, Elsevier, vol. 55(C), pages 354-360.
    4. Okasha, Farouk M., 2016. "Short overview on the jetting-fountain fluidized bed (JFFB) combustor," Renewable and Sustainable Energy Reviews, Elsevier, vol. 55(C), pages 674-686.
    5. Germán Álvarez-López & Alejandra María Múnera & Juan G. Villegas, 2023. "Multicriteria Decision-Making Tools for the Selection of Biomasses as Supplementary Cementitious Materials," Sustainability, MDPI, vol. 15(13), pages 1-17, June.

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