Co-firing black liquor and biomass in a laboratory single droplet reactor - effects on emissions and combustion characteristics

Nikolai De Martini, Esperanza Monedero, Patrik Yrjas, Mikko Hupa

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    Mills having recovery boilers with excess capacity can potentially mix other biofuels into the black liquor to produce more electricity from biomass. This work is a laboratory study of the effect on combustion of mixing other biofuels with black liquor. The four fuels mixed with softwood black liquor were bark, wood chips, peat, and bio-sludge (which some mills already burn with black liquor). Droplets of the mixed fuels were burned at 1100 degrees C and 3% O-2 in a single particle reactor. Video and on-line gas analyzers for CO, CO2 and NO were used to measure swelling, combustion times, carbon evolution (CO+CO2), and NO formation tendency. We found changes in swelling, char burning, and NO formation, but the results indicate that mixing biofuels with black liquor may be a reasonable method of producing additional electricity.
    Original languageUndefined/Unknown
    Pages (from-to)30–34
    Number of pages6
    JournalTappi Journal
    Issue number9
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed


    • black liquor
    • Biofuels

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