Objective: The reactivity and combustion performance of mixtures of lignite with
peach kernel and cardoon were investigated, through thermal analysis experiments, for assessing
the potential impacts of these wastes as co-firing fuels.
Methods: Additionally, a control method was applied to reduce problematic elements from
biomass ashes in order to mitigate deposition phenomena in co-firing units. The results
showed that combustion performance of raw fuels followed the order cardoon>peach
kernel>lignite, however in case of blends, this order was reversed lignite/peach kernel>
lignite/cardoon, revealing synergistic effects between component fuels.
Results: The combustion performance of lignite was improved by blending it with biomass
fuels. Deposition problems should be expected in boilers firing peach kernel and cardoon
fuels above 900°C.
Conclusion: After alkalis leaching, the reactivity and efficiency of woody materials and
mixtures with lignite were enhanced, while the slagging/fouling propensity was reduced.