Experiments and modelling of NOx precursors release (NH3 and HCN) in fixed-bed biomass combustion conditions

Publikation: Beitrag in Fachzeitschrift/ZeitungArtikel

Abstract

There is a need to reduce NOx emissions, which can only be achieved through a detailed understanding of the mechanisms for their formation and reduction. In this work the release of the NOx precursors, NH3 and HCN, for different fuels is experimentally analysed and modelled in typical fixed-bed combustion conditions. It is shown that NH3 and HCN are released during the main devolatilization phase and the NH3/HCN ratio increases for fuels with a higher nitrogen content. A simplified two-steps model for their release is presented. The model can predict with a reasonable accuracy the release for fuels with a low nitrogen content, however deviations are present for fuels with a high nitrogen content, which probably arise due to a reduction of NH3 and HCN taking place already in the bed.

Spracheenglisch
Seiten529-537
Seitenumfang9
ZeitschriftFuel
Band222
DOIs
StatusVeröffentlicht - 15 Jun 2018

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Biomass
Nitrogen
Experiments

Schlagwörter

    ASJC Scopus subject areas

    • !!Chemical Engineering(all)
    • !!Fuel Technology
    • !!Energy Engineering and Power Technology
    • Organische Chemie

    Dies zitieren

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    title = "Experiments and modelling of NOx precursors release (NH3 and HCN) in fixed-bed biomass combustion conditions",
    abstract = "There is a need to reduce NOx emissions, which can only be achieved through a detailed understanding of the mechanisms for their formation and reduction. In this work the release of the NOx precursors, NH3 and HCN, for different fuels is experimentally analysed and modelled in typical fixed-bed combustion conditions. It is shown that NH3 and HCN are released during the main devolatilization phase and the NH3/HCN ratio increases for fuels with a higher nitrogen content. A simplified two-steps model for their release is presented. The model can predict with a reasonable accuracy the release for fuels with a low nitrogen content, however deviations are present for fuels with a high nitrogen content, which probably arise due to a reduction of NH3 and HCN taking place already in the bed.",
    keywords = "Biomass, Combustion, Lab-scale reactor, Model, NO precursor, Pyrolysis",
    author = "Andr{\'e}s Anca-Couce and Peter Sommersacher and Nikola Evic and Ramin Mehrabian and Robert Scharler",
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    AU - Anca-Couce,Andrés

    AU - Sommersacher,Peter

    AU - Evic,Nikola

    AU - Mehrabian,Ramin

    AU - Scharler,Robert

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    AB - There is a need to reduce NOx emissions, which can only be achieved through a detailed understanding of the mechanisms for their formation and reduction. In this work the release of the NOx precursors, NH3 and HCN, for different fuels is experimentally analysed and modelled in typical fixed-bed combustion conditions. It is shown that NH3 and HCN are released during the main devolatilization phase and the NH3/HCN ratio increases for fuels with a higher nitrogen content. A simplified two-steps model for their release is presented. The model can predict with a reasonable accuracy the release for fuels with a low nitrogen content, however deviations are present for fuels with a high nitrogen content, which probably arise due to a reduction of NH3 and HCN taking place already in the bed.

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    KW - Combustion

    KW - Lab-scale reactor

    KW - Model

    KW - NO precursor

    KW - Pyrolysis

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