Circulating fluidised bed co-combustion of coal and biomass

Pilar Gayan, Juan Adanez (Corresponding Author), Luis F. de Diego, Francisco Garcia-Labiano, Andres Cabanillas, Alberto Bahillo, Martti Aho, Kati Veijonen

    Research output: Contribution to journalArticleScientificpeer-review

    76 Citations (Scopus)

    Abstract

    Circulating fluidised bed combustion (CFBC) is receiving wide research attention in view its potential as an economic and environmentally acceptable technology for burning low-grade coals, biomass and organic wastes, and thereby mixtures of them. Designs of the existing fluidised bed boilers for biomass combustion are mainly based on experience from coal combustion because the mechanism of combustion of biomass in fluidised beds is still not well understood. A good understanding of the combustion and pollutant formation processes and the modelling of the combustor can greatly avoid costly upsets of the plants.

    In this paper, the performance of CFBC burning coal and biomass mixtures was analysed. Experimental results were obtained from the combustion of two kinds of coal with a forest residue (Pine bark) in two CFB pilot plants (0.1 and 0.3 MWth). The effect of the main operating conditions on carbon combustion efficiency was analysed. Moreover, a mathematical model to predict the behaviour of the co-combustion of coal and biomass wastes in CFB boilers has been developed and validated. The developed model can predict the different gas concentrations along the riser (O2, CO, CH4, etc.), and the carbon combustion efficiency. The experimental results of carbon combustion efficiencies were compared with those predicted by the model and a good correlation was found for all the conditions used.

    Original languageEnglish
    Pages (from-to)277 - 286
    Number of pages10
    JournalFuel
    Volume83
    Issue number3
    DOIs
    Publication statusPublished - 2004
    MoE publication typeA1 Journal article-refereed

    Keywords

    • co-firing
    • circulating fluidized beds
    • fluidized bed combustion
    • fluidized beds
    • mathematical modelling

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