Absorption of HCl and HF by Ca-based sorbents at FBC conditions

J Partanen, Peter Backman, Mikko Hupa

    Research output: Chapter in Book/Conference proceedingConference contributionScientificpeer-review


    In fluidized bed combustion of S-​contg. fuels, adding limestone or dolomite to the bed is a widely applied method to control SO2 emissions.  In this work, HCl and HF adsorption by Ca-​based sorbents was studied in the lab. at different temps. from concns. inside the boiler furnace to those in the second pass (850-​650°)​.  The effect of temp., absorbent quality, and gas atm. on HCl and HF removal by Ca-​sorbents was examd.; special emphasis was placed on studying the effect of molten-​phase formation in HCl absorption.  Expts. were conducted isothermally using a thermogravimetric app. specially designed to study solid-​gas reactions.  Two limestones and 1 dolomite absorbent were tested; the effect of gas compn. was examd. by varying CO2, water, and SO2 concns. in a simulated flue gas mixt.  Absorbent conversions were calcd., and SEM- and energy dispersive spectrometry-​observations were conducted to study the reaction pattern inside the absorbent particles.  HF was very reactive, and conversions to CaF2 were close to 100​%.  CaCl2 was also formed at 650° and 850°, but the conversion was highly dependent on water and SO2 concns.
    Original languageUndefined/Unknown
    Title of host publicationProceedings of the 16th international conference on fluidized bed combustion
    EditorsDW Geiling
    PublisherAmerican Society of Mechanical Engineers, ASME
    ISBN (Print)9780791835234
    Publication statusPublished - 2001
    MoE publication typeA4 Article in a conference publication
    Eventconference; 2001-05-13; 2001-05-16 - Reno, Nevada
    Duration: 13 May 200116 May 2001


    Conferenceconference; 2001-05-13; 2001-05-16

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