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

J Partanen, Peter Backman, Mikko Hupa

    Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinenvertaisarvioitu


    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.
    AlkuperäiskieliEi tiedossa
    OtsikkoProceedings of the 16th international conference on fluidized bed combustion
    ToimittajatDW Geiling
    KustantajaAmerican Society of Mechanical Engineers, ASME
    ISBN (painettu)9780791835234
    TilaJulkaistu - 2001
    OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
    Tapahtumaconference; 2001-05-13; 2001-05-16 - Reno, Nevada
    Kesto: 13 toukok. 200116 toukok. 2001


    Konferenssiconference; 2001-05-13; 2001-05-16