Modeling limestone reactivity and sizing the dissolution tank in wet flue gas desulfurization scrubbers

Claudio Carletti, Frej Bjondahl, Cataldo De Blasio, Jarl Ahlbeck, Lauri Järvinen, Tapio Westerlund

    Tutkimustuotos: LehtiartikkeliArtikkeliTieteellinenvertaisarvioitu

    18 Sitaatiot (Scopus)

    Abstrakti

    Sulfur dioxide (SO2) is one of the pollutant gases that result from energy conversion by coal and oil combustion. Limestone slurries are widely utilized in wet flue gas desulfurization (WFGD) processes. The evaluation of the reagent's reactivity is fundamental for process design and plant operation. The comparison of different limestone and dolomite rocks through dissolution experiments was realized by applying a model for second-order kinetics. And a total of 12 different samples were tested, at three different size fractions. A simulation model was developed to identify each sample's impact on sizing the dissolution tank of a WFGD scrubber. A second-order model was applied within the scrubber's dissolution tank range of operation at pH values between 4 and 5. The regression coefficients for the second-order model were higher than 0.98 in all cases. The dissolution tank volume estimation was done based on the reagent's overall chemical reaction constant in dissolution experiments. The limestone rocks, where the prevailing mineral was calcite (CaCO3), demonstrated higher chemical reactivity yielding smaller dissolution tank volumes than the dolomite rocks, where the prevailing mineral was dolomite (CaMg(CO3)(2)). The CaO and MgO content of a sample can be used to predict the dissolution rate; nevertheless more factors influence the rate and the tank sizing. The knowledge of the sample's composition and its reactivity is necessary for the design of a desulfurization scrubber; the reagent used is determinant for the economy and optimal operation of such scrubbers.
    AlkuperäiskieliEi tiedossa
    Sivut663–672
    Sivumäärä10
    JulkaisuEnvironmental Progress and Sustainable Energy
    Vuosikerta32
    Numero3
    DOI - pysyväislinkit
    TilaJulkaistu - 2013
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

    Keywords

    • dissolution
    • flue gas desulfurization
    • limestone
    • simulation

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