Mercury behaviour in a modern coal power plant: Mass balance and mercury attachment on particles

Tiina Harju, Markus Olin, Kari Larjava, Ingvar Wängberg

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

    Abstract

    The study consists of mass balance studies of mercury, measurements of total mercury and mercury species in flue gases, measurement of gaseous flue gas compounds (CO, CO2, NOx, SO2, N2O, HCl, CH4), utilision studies of fly ash and modelling of mercury behaviour before an electrostatic precipitator (ESP) in a modern coal power plant. The measurements were done with two different air ratios. Gaseous mercury species are not likely to reach super saturation state in flue gases. In measurements at power plants it has been observed that a significant fraction of the mercury may be in the particulate phase, however. Here we present a constrained equilibrium - collision theory model approach, in which the distribution of elemental mercury and oxidized mercury species in the gas phase are determined by thermodynamic equilibrium at high temperatures (>800 K), whereas the oxidation is frozen at lower temperatures. The uptake of elemental gaseous mercury and oxidized gaseous mercury species on already existing particles in the flue gas is described by collision theory. The model application is difficult due to the lack of the actual particle concentration and particle size distribution in flue gases.
    Original languageEnglish
    Title of host publicationProceedings of Air Quality III: Mercury, Trace Elements and Particulate Matter. Arlington, VA, US, 9 - 12 Sept. 2002
    Publication statusPublished - 2002
    MoE publication typeA4 Article in a conference publication
    EventInternational Conference on Air Quality III, AQIII - Arlington, United States
    Duration: 10 Sep 200212 Sep 2002

    Conference

    ConferenceInternational Conference on Air Quality III, AQIII
    CountryUnited States
    CityArlington
    Period10/09/0212/09/02

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    Keywords

    • mercury
    • modern coal power plant
    • mass balance
    • particles
    • modelling

    Cite this

    Harju, T., Olin, M., Larjava, K., & Wängberg, I. (2002). Mercury behaviour in a modern coal power plant: Mass balance and mercury attachment on particles. In Proceedings of Air Quality III: Mercury, Trace Elements and Particulate Matter. Arlington, VA, US, 9 - 12 Sept. 2002