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

P. Yrjas, B.-J. Skrifvars, M. Hupa, J. Roppo, M. Nylund, Pasi Vainikka

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

    19 Citations (Scopus)

    Abstract

    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 s 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 biofuelled 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 temperature was about 730°C (probe surface temp. 540°C) and the second where the flue gas temperature 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 addition to proximate and ultimate fuel analysis so called fuel fractionation was applied. The method can be used to determine how the elements are bound in the fuel and how they may behave during combustion. The analysis results from the measurement campaign and from the advanced fuel analysis were combined and are reported in this paper, with emphasis on the fate of chlorine.
    Original languageEnglish
    Title of host publicationProceedings of 18th International Conference on Fluidized Bed Combustion
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Pages679-687
    ISBN (Electronic)0-7918-4183-9
    ISBN (Print)0-7918-3755-6
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA4 Article in a conference publication
    Event18th International Conference on Fluidized Bed Combustion, FBC 2005 - Toronto, Canada
    Duration: 22 May 200525 May 2005

    Conference

    Conference18th International Conference on Fluidized Bed Combustion, FBC 2005
    Country/TerritoryCanada
    CityToronto
    Period22/05/0525/05/05

    Keywords

    • co-firing
    • biomass
    • full-scale ash deposits
    • chlorine in deposits

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