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Investigation of the apparent kinetics of air and oxy-fuel biomass combustion in a spout fluidised-bed reactor

Lookup NU author(s): Dr Yongliang YanORCiD

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Abstract

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 O₂ 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 n^th 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.

Publication metadata

Author(s): Yan Y, Clough PT, Anthony EJ

Publication type: Article

Publication status: Published

Journal: Chemical Engineering Research and Design

Year: 2020

Volume: 153

Pages: 276-283

Print publication date: 01/01/2020

Online publication date: 06/11/2019

Acceptance date: 28/10/2019

ISSN (print): 0263-8762

ISSN (electronic): 1744-3563

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.cherd.2019.10.043

DOI: 10.1016/j.cherd.2019.10.043

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