English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/84940
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Behaviour of a bauxite waste material as oxygen carrier in a 500Wth CLC unit with coal

AuthorsMendiara, Teresa; Diego Poza, Luis F. de ; García Labiano, Francisco ; Gayán Sanz, Pilar ; Abad Secades, Alberto ; Adánez Elorza, Juan
KeywordsCombustion
Coal
CO2 capture
Chemical looping
Bauxite waste
Issue Date2013
PublisherElsevier
CitationInternational Journal of Greenhouse Gas Control 17: 170- 182 (2013)
AbstractThis paper is focused on the Chemical Looping Combustion (CLC) of coal. Under this configuration, coal is fed directly into the fuel reactor where coal is gasified and the gaseous products react with the oxygen carrier. In CLC of coal it is especially interesting to consider low cost oxygen carriers as some losses of solid material may occur during the ashes drainage. The performance as oxygen carrier of a Fe-enriched sand fraction (Fe-ESF) generated in the alumina production from bauxite is evaluated in this work. The experiments were carried out in a continuous 500Wth unit using a bituminous coal. Different variables affecting the process were analyzed, such as the temperature in the fuel reactor, coal feeding rate, solid circulation flow and composition of the gasifying gas. High combustion efficiencies in the fuel reactor (around 90%) were obtained at all the temperatures tested. Low oxygen demand (<5%) values were also obtained in the temperature interval tested (880-930°C). Higher temperatures or the use of a carbon separation system would be needed to have high carbon capture efficiencies. Regarding OC performance, good results were found. During 40h of continuous operation, the attrition rate was adequate and no agglomeration problems were detected. The reactivity of the oxygen carrier slightly increased as well as the porosity. Compared to ilmenite, the most tested oxygen carrier material so far for this process, the Fe-ESF material provided lower oxygen demand at the fuel reactor outlet and higher oxygen transfer rates in similar experimental conditions, which makes Fe-ESF an interesting alternative for CLC processes with coal. © 2013 Elsevier Ltd.
Description12 paginas, 13 figuras.--Available online 7 June 2013
URIhttp://hdl.handle.net/10261/84940
DOI10.1016/j.ijggc.2013.04.020
Identifiersdoi: 10.1016/j.ijggc.2013.04.020
issn: 1750-5836
Appears in Collections:(ICB) Artículos
Files in This Item:
File Description SizeFormat 
Behviour_of_a_bauxite_waste.pdf683,18 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.