Direct Numerical Simulation of biomass pyrolysis and combustion with gas phase reactions

A. Aswasthi, Johannes G.M. Kuerten, Bernardus J. Geurts

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    165 Downloads (Pure)

    Abstract

    We present Direct Numerical Simulation of biomass pyrolysis and combustion in a turbulent channel flow. The model includes simplified models for biomass pyrolysis and char combustion along with a model for particle tracking. The gas phase is modelled as a mixture of reacting gas species. The gas-particle interactions for mass, momentum, and energy exchange are included by two-way coupling terms. The effect of two-way coupling on the conversion time of biomass particles is found noticeable for particle volume fractions $> 10^{-5}$. We also observe that at constant volume fraction the effect of two-way coupling increases as the particle size is reduced, due to the higher total heat exchange area in case of smaller particles. The inclusion of gas phase homogeneous reactions in the DNS model decreases the biomass pyrolysis time due to higher gas temperatures. In contrast, including gas phase reactions increases the combustion time of biomass due to the lower concentration of oxygen at the particle surface.
    Original languageEnglish
    Title of host publication7th European Thermal-Sciences Conference (Eurotherm2016)
    Subtitle of host publication19–23 June 2016, Krakow, Poland
    Place of PublicationBristol, UK
    PublisherIOP
    Pages032119
    Number of pages9
    DOIs
    Publication statusPublished - 19 Jun 2016
    Event7th European Thermal-Sciences Conference, Eurotherm 2016 - Krakow, Poland
    Duration: 19 Jun 201623 Jun 2016
    Conference number: 7

    Publication series

    NameJournal of Physics: Conference Series
    PublisherIOP
    Volume745
    ISSN (Print)1742-6588
    ISSN (Electronic)1742-6596

    Conference

    Conference7th European Thermal-Sciences Conference, Eurotherm 2016
    Abbreviated titleEurotherm
    CountryPoland
    CityKrakow
    Period19/06/1623/06/16

    Keywords

    • EWI-27440
    • IR-103046
    • METIS-320897

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