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

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

    Research output: Contribution to journalArticle in an indexed scientific journalResearchpeer-review

    36 Scopus citations

    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.

    Original languageEnglish
    Pages (from-to)3846-3854
    Number of pages9
    JournalEnergy
    Volume36
    Issue number6
    DOIs
    StatePublished - Jun 2011

    Bibliographical note

    Funding Information:
    The authors express their gratefulness to the Universidad Pontificia Bolivariana, the Instituto Colombiano para el Desarrollo de la Ciencia y la Tecnología (COLCIENCIAS) and the company PREMAC S.A. for their funding and technical support offered to the research project. In addition, the reviewers are greatly acknowledged for their constructive comments.

    Keywords

    • Fluidized bed combustion
    • Rice husk
    • Rice husk ash
    • Silica

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