Biomass Pyrolysis in DNS of Turbulent Particle-Laden Flow

E. Russo, J.G.M. Kuerten, B.J. Geurts

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    Abstract

    Biomass is important for co-firing in coal power plants thereby reducing CO2 emissions. Modeling the combustion of biomass involves various physical and chemical processes, which take place successively and even simultaneously [1, 2]. An important step in biomass combustion is pyrolysis, in which virgin biomass is converted into char. In this paper a point-particle model for the pyrolysis of biomass particles based on Haseli [3] is developed, which is coupled to a direct numerical simulation of the turbulent flow of gas in a channel with heated walls, using two-way coupling of mass, momentum and energy. We do not model combustion and gasification of biomass, but focus on pyrolysis, in particular on the effect of particle-gas interaction on the conversion time, i.e. the time needed to convert biomass into char. This is the first attempt in modeling the pyrolysis of biomass in a 3D flow framework. Gas-particle interaction affects the conversion time, which shows a characteristic dependence on particle size and concentration as shown in the results presented in this paper. In the following, the model of the biomass pyrolysis and of the gas with details on the way the two phases are coupled are introduced.
    Original languageEnglish
    Title of host publicationDirect and Large-Eddy Simulation IX
    EditorsJochen Fröhlich, Hans Kuerten, Bernard J. Geurts, Vincenzo Armenio
    Place of PublicationCham
    PublisherSpringer
    Pages613-620
    Number of pages8
    ISBN (Electronic)978-3-319-14448-1
    ISBN (Print)978-3-319-14447-4
    DOIs
    Publication statusPublished - 28 Jan 2015
    Event9th ERCOFTAC Workshop on Direct and Large-Eddy Simulation IX, DLES 2013 - TU Dresden, Dresden, Germany
    Duration: 3 Apr 20135 Apr 2013
    Conference number: 9

    Publication series

    NameERCOFTAC series
    PublisherSpringer International Publishing
    Volume20
    ISSN (Print)1382-4309
    ISSN (Electronic)2215-1826

    Conference

    Conference9th ERCOFTAC Workshop on Direct and Large-Eddy Simulation IX, DLES 2013
    Abbreviated titleDLES
    CountryGermany
    CityDresden
    Period3/04/135/04/13

    Keywords

    • Pyrolysis temperature
    • Particle volume fraction
    • Conversion time
    • Coal power plant
    • Thermal front

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