Investigations into the Effects of Volatile Biomass Tar on the Performance of Fe-Based CLC Oxygen Carrier Materials

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Title: Investigations into the Effects of Volatile Biomass Tar on the Performance of Fe-Based CLC Oxygen Carrier Materials
Authors: Boot-Handford, M
Florin, N
Fennell, PS
Item Type: Journal Article
Abstract: In this study we present findings from investigations into interactions between biomass tar and two iron based oxygen carrier materials (OCMs) designed for chemical-looping applications: a 100% Fe2O3 (100Fe) OCM and a 60 wt% Fe2O3/40 wt% Al2O3 (60Fe40Al) OCM. A novel 6 kWe two-stage, fixed-bed reactor was designed and constructed to simulate a chemical-looping combustion (CLC) process with ex situ gasification of biomass. Beech wood was pyrolysed in the first stage of the reactor at 773 K to produce a tar-containing fuel gas that was used to reduce the OCM loaded into the 2nd stage at 973 K. The presence of either OCM was found to significantly reduce the amount of biomass tars exiting the reactor by up to 71 wt% compared with analogous experiments in which the biomass tar compounds were exposed to an inert bed of sand. The tar cracking effect of the 60Fe40Al OCM was slightly greater than the 100Fe OCM although the reduction in the tar yield was roughly equivalent to the increase in carbon deposition observed for the 60Fe40Al OCM compared with the 100Fe OCM. In both cases, the tar cracking effect of the OCMs appeared to be independent of the oxidation state in which the OCM was exposed to the volatile biomass pyrolysis products (i.e. Fe2O3 or Fe3O4). Exposing the pyrolysis vapours to the OCMs in their oxidised (Fe2O3) form favoured the production of CO2. The production of CO was favoured when the OCMs were in their reduced (Fe3O4) form. Carbon deposition was removed in the subsequent oxidation phase with no obvious deleterious effects on the reactivity in subsequent CLC cycles with reduction by 3 mol% CO.
Issue Date: 25-Oct-2016
Date of Acceptance: 8-Sep-2016
URI: http://hdl.handle.net/10044/1/41383
DOI: http://dx.doi.org/10.1088/1748-9326/11/11/115001
ISSN: 1748-9326
Publisher: IOP Publishing
Journal / Book Title: Environmental Research Letters
Volume: 11
Issue: 11
Copyright Statement: Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
Keywords: Meteorology & Atmospheric Sciences
Multidisciplinary
Publication Status: Published
Article Number: 115001
Appears in Collections:Faculty of Engineering
Centre for Environmental Policy
Chemical Engineering
Faculty of Natural Sciences



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