Demonstration of plasma excited atomic resonance line spectroscopy for on-line measurement of alkali metals in a 20 kW bubbling fluidized bed

Ville Häyrinen (Corresponding Author), Rolf Hernberg, Martti Aho

    Research output: Contribution to journalArticleScientificpeer-review

    14 Citations (Scopus)

    Abstract

    An instrument based on Plasma Excited Atomic Resonance Line Spectroscopy (PEARLS) was applied to measurements of vapor and aerosol phase Na and K in atmospheric combustion conditions. The PEARLS method is based on dissociation of alkali compounds by a direct current plasma torch and subsequent determination of alkali concentration by atomic absorption spectroscopy. The measurements were carried out in a 20 kW bubbling fluidized bed reactor during co-combustion of biomass and coal. The capability of the instrument to operate under atmospheric high-ash conditions was demonstrated. The analysis was made directly from hot (880 °C) particulate laden sample gas. The fuels were pine bark mixed with South African coal and Finnish forest residue mixed with Polish lignite. Thirty percent addition of coal or lignite to biomass reduced measured alkali concentrations by 44–64%. The reduction is explained by conversion of alkali chlorides and hydroxides to sulfates and silicates.
    Original languageEnglish
    Pages (from-to)791 - 797
    Number of pages7
    JournalFuel
    Volume83
    Issue number7-8
    DOIs
    Publication statusPublished - 2004
    MoE publication typeA1 Journal article-refereed

    Keywords

    • alkali measurement
    • DC plasma
    • absorption spectroscopy
    • co-combustion
    • corrosion
    • fluidized beds

    Fingerprint Dive into the research topics of 'Demonstration of plasma excited atomic resonance line spectroscopy for on-line measurement of alkali metals in a 20 kW bubbling fluidized bed'. Together they form a unique fingerprint.

    Cite this