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The article presents a study concerning the effect of mixing black liquor and biomass fuels on combustion and emissions in a laboratory single droplet reactor. It highlights the biomass fuels mixed with softwood black liquor which include bark, peat and wood chips. It states that mixture of black liquor and biomass is a reasonable method for generating additional electricity despite the formation of nitrogen oxide and changes in char burning and swelling.

This study centers on gaseous nitrogenous emissions (NOx and NH3) found in the recovery bolter and the causticizing area at three kraft mills. It covers the NOx amission tendencies of the black liquors, the cyanate (OCN-) formation during black liquor combustion, and the formation of ammonia (NH3) from cyanate in the mill liquors. Mass balances were carried out to calculate the nitrogen flow with the smelt, and these data were compared to the nitrogen flow with the black liquor based on black liquor analysis and mill process data, in all cases, about 30% of the black liquor nitrogen formed NO, of which approximately 60% was from the pyrolysis combustion step and the remaining 40% was formed during char combustion and smelt oxidation. [ABSTRACT FROM AUTHOR]