Abstract
Biomass co-firing is becoming a promising solution to reduce CO2 emissions, due to its renewability and carbon neutrality. Biomass normally has high moisture and volatile contents, complicating its combustion behavior, which is significantly different from that of coal. A computational fluid dynamics (CFD) combustion model of a single biomass particle is employed to study high-temperature rapid biomass combustion. The two-competing-rate model and kinetics/diffusion model are used to model biomass devolatilization reaction and char burnout process, respectively, in which the apparent kinetics used for those two models were from high temperatures and high heating rates tests. The particle size changes during the devolatilization and char burnout are also considered. The mass loss properties and temperature profile during the biomass devolatilization and combustion processes are predicted; and the timescales of particle heating up, drying, devolatilization, and char burnout are compared and discussed. Finally, the results shed light on the effects of particle size on the combustion behavior of biomass particle.
Highlights
Biomass is a sustainable fuel that can deliver a significant reduction in net carbon emissions when compared with fossil fuels, and environmental and social benefits could be expected [1]
Most common analysis based on TGA is not able to determine the accurate kinetics of biomass combustion at real furnace conditions, due to the relatively low temperatures (
This paper studies biomass combustion properties at a high temperature and high heating rate that are similar to the conditions in a real furnace
Summary
Biomass is a sustainable fuel that can deliver a significant reduction in net carbon emissions when compared with fossil fuels, and environmental and social benefits could be expected [1]. There is a clear lack of a suitable biomass combustion model with feasibility of representing more faithfully a true boiler or furnace condition, in which biomass particles are heated rapidly to high temperatures. To study the combustion properties of a woody biomass particle, Haseli et al [14] upgraded a one-dimensional particle model accounting for particle heating-up, devolatilization, char oxidation, and gaseous phase reactions. A computational fluid dynamics (CFD) combustion model of a single biomass particle is employed, and the existing devolatilization and char oxidation models are upgraded to study high-temperature rapid biomass combustion behavior. The mass loss properties and temperature profile during the biomass devolatilization; and combustion processes are predicted, and the timescales of particle heating up, drying, devolatilization, and char burnout are discussed
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