Chlorine in deposits during co-firing of biomass, peat, and coal in a full-scale CFBC boiler

Patrik Yrjas, BJ Skrifvars, Mikko Hupa, J Roppo, M Nylund, P Vainikka

    Tutkimustuotos: Artikkeli kirjassa/raportissa/konferenssijulkaisussaKonferenssiartikkeliTieteellinenvertaisarvioitu

    24 Sitaatiot (Scopus)


    Co-​combustion of coal with biomass or firing biomass alone is increasingly used as a first step to meet the Finnish commitments under the Kyoto agreement.  Fluidized bed combustors are commonly used when co-​firing, however, even if FBC have a wide tolerance for different fuel qualities, co-​combustion of biomass or firing biomass alone may lead to unwanted ash-​related problems. A deposit measurement campaign was done, at the 550 MWth biofueled CFB in Jakobstad, Finland.  During the campaign a total of 16 different fuel blends were burned.  The deposits were sampled with air-​cooled probes with detachable rings.  The deposits were sampled at two different locations, one where the flue gas temp. was about 730°C (probe surface temp. 540°C) and the second where the flue gas temp. was about 530°C (probe surface temp. 350°C)​.  From every deposit sample three elemental analyses were done - one from the wind side, one from the lee side, and one from an angle of about 50° from the wind side.  The analyses were done with a SEM​/EDX analyzer.  The fuels used during the measurement campaigns were sampled and analyzed.  In addn. to proximate and ultimate fuel anal. so called fuel fractionation was applied.  The fractionation method is based on selective leaching by water, ammonium acetate, and hydrochloric acid, consecutively.  After each leaching step the solns. are analyzed for the most important elements.  The method can be used to det. how the elements are bound in the fuel and how they may behave during combustion.  The anal. results from the measurement campaign and from the advanced fuel anal. were combined and are reported in this paper, with emphasis on the fate of chlorine.
    AlkuperäiskieliEi tiedossa
    OtsikkoProceedings of the 18th International Conference on Fluidized Bed Combustion
    ToimittajatL Jia
    KustantajaAmerican Society of Mechanical Engineers, ASME
    ISBN (painettu)0-7918-4698-9
    TilaJulkaistu - 2005
    OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
    Tapahtumaconference; 2005-05-22; 2005-05-25 - Toronto, Canada
    Kesto: 22 toukok. 200525 toukok. 2005


    Konferenssiconference; 2005-05-22; 2005-05-25