Small scale fluidized bed experiments under oxygen combustion conditions

Toni Pikkarainen, Antti Tourunen, Heidi Nevalainen, Timo Leino, Jaakko Saastamoinen, Timo Eriksson

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

    Abstract

    In oxygen combustion fuel is burned with almost pure oxygen and recycled flue gas without nitrogen from the air. By avoiding the diluting effect of nitrogen, the carbon dioxide capture of flue gas becomes more effective. Gas atmosphere in the reactor depends on flue gas recirculation ratio and consists mainly on carbon dioxide, water vapour and oxygen. Gas atmosphere has effects on burning rate, reaction kinetics, emission formation and sulphur capture by limestone. VTT (Technical Research Centre of Finland) has in Jyvaeskylae unique small scale fluidized bed combustors applicable for oxygen combustion research. Pilot scale (30-100 kW) circulating fluidized bed (CFB) reactor can be operated at air firing and at oxygen combustion mode. Reactor is equipped with O{sub 2} and CO{sub 2} feed from gas tanks and also with flue gas recirculation for demonstrating real oxygen combustion conditions. In addition, a smaller BFB/CFB reactor {lt} 1 kW), which can be operated at batch and continuous combustion modes, is suitable for phenomena studies of oxygen combustion. A set of oxygen combustion experiments with bituminous coal and limestone feed was carried out with pilot and laboratory scale reactors. With CFB-pilot reactor, normal air combustion is compared to oxygen combustion with O{sub 2}/CO{sub 2} feed from gas tanks and to real oxygen combustion with flue gas recirculation. Fuel reactivity and limestone sulphur capture tests were carried out at varying oxygen combustion conditions with laboratory scale reactor, and results were compared to air combustion. At pilot tests, feed gas oxygen content varied between 21-40% and at laboratory scale tests between 5-50%.
    Original languageEnglish
    Title of host publicationInternational conference on coal science and technology
    Subtitle of host publicationProgramme and full papers, CD-ROM
    Pages1-11
    ISBN (Electronic)978-92-9029-438-2
    Publication statusPublished - 2007
    MoE publication typeA4 Article in a conference publication
    EventInternational Conference on Coal Science and Technology - Nottingham, United Kingdom
    Duration: 28 Aug 200731 Aug 2007

    Conference

    ConferenceInternational Conference on Coal Science and Technology
    CountryUnited Kingdom
    CityNottingham
    Period28/08/0731/08/07

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