Journal
CHEMICAL ENGINEERING RESEARCH & DESIGN
Volume 153, Issue -, Pages 276-283Publisher
ELSEVIER
DOI: 10.1016/j.cherd.2019.10.043
Keywords
Combustion; Kinetics; Biomass; Oxy-fuel; Spouted fluidised bed; Carbon capture and storage
Categories
Funding
- EPSRC [EP/P026214/1]
- UKCCSRC [EP/P026214/1]
- Cranfield University Energy and Power research bursary
- EPSRC [EP/P026214/1] Funding Source: UKRI
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A bench-scale spouted fluidised-bed reactor was used to investigate the combustion kinetics of Pulverised woody biomass under air and oxy-fuel atmospheres. Bed temperatures were in the range of 923-1073 K and O-2 concentrations were varied from 20-35 vol%. The activation energies and apparent orders of reaction were calculated for air and oxy-fuel combustion by means of an nth order Arrhenius equation approach. Results indicated that the apparent order of reaction for both air and oxy-fuel combustion was approximately zero. The activation energies were calculated assuming a zero-order reaction mechanism and were averaged over all oxygen concentrations for air and oxy-fuel combustion and found to be 18.95 kJ/mol and 26.93 kJ/mol, respectively. The rate of combustion under oxy-fuel conditions was, on average, 37.5% higher compared to air combustion. The shrinking core model with a reaction-controlled step was found to accurately represent the biomass combustion reactions under both air and oxy-fuel conditions. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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