Abstract
The co-firing of coal and biomass was studied using DTG assays. Blends of coal of different ranks and pine charcoal (obtained through pyrolysis of biomass at 1000°C) were prepared. Combustion profiles and characteristic temperatures (IT, PT and BT) were obtained and compared. To detect deviations, the experimental burnout curves for each blend were compared with weighted averages calculated from the conversion profiles obtained for the individual fuel samples and the blend composition. Positive and negative deviations were obtained which can be predicted from the differences in the reactivity of the blend components and their relative proportions.
Highlights
The co-firing of coal and biomass was studied using differential thermogravimetric (DTG) assays
A previous study by Ulloa et al [2005] showed that deviations in the burnout of blends made with coals of different ranks were produced during the heterogeneous combustion stage
Petrographic analysis indicated that coal B was lignite, a low-rank coal (Ro= 0.22%) rich in vitrinite, whereas coal L (%Ro= 0.71) was bituminous, high in volatiles and having a considerable content of inertinite (28.1%), which is considered to be less reactive than vitrinite during combustion
Summary
The co-firing of coal and biomass was studied using DTG assays. Blends of coal of different ranks and pine charcoal (obtained through pyrolysis of biomass at 1000°C) were prepared. A previous study by Ulloa et al [2005] showed that deviations in the burnout of blends made with coals of different ranks were produced during the heterogeneous combustion stage. In the last few years, several authors have considered the effect of mixing different types of biomass with coal, obtaining diverse results in terms of how the blend affects the burnout.
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