English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/95955
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:

Effect of operating conditions and H2S presence on the performance of CaMg0.1Mn0.9O3-δ perovskite material in chemical looping combustion (CLC)

AutorCabello Flores, Arturo; Abad Secades, Alberto ; Gayán Sanz, Pilar ; Diego Poza, Luis F. de ; García Labiano, Francisco ; Adánez Elorza, Juan
Fecha de publicación2014
EditorAmerican Chemical Society
CitaciónEnergy and Fuels 28: 1262- 1274 (2014)
ResumenChemical looping combustion (CLC) is considered a promising technology for CO2 capture and sequestration (CCS), since the CO2 generated during the combustion process of a gaseous fuel is inherently separated. Recently, perovskite-type particles based on Mn have been investigated for use as oxygen carrier materials in CLC processes. These materials present some advantageous characteristics, in comparison with metal oxides, such as reduced cost, environmentally friendly behavior, and the oxygen uncoupling effect. In this sense, the objective of this study was to assess the performance of the CaMn0.9Mg0.1O3-δ perovskite as an oxygen carrier.. The influence of different parameters such as the solids inventory, oxygen carrier-to-fuel ratio (φ), operational time, and sulfur content of fuel on CH4 combustion efficiency, was studied in a continuous 500-Wth CLC unit. In addition, the evolution of oxygen carrier reactivity, mechanical integrity, and agglomeration behavior, relative to operating time, was analyzed. When combustion tests were carried out without sulfur addition, it was observed that a very high excess of oxygen over the stoichiometric conditions (φ > 11) was needed to reach full CH 4 conversion. Under these conditions, the oxygen uncoupling effect was relevant to fully convert the fuel, and some O2 appeared at the outlet of the fuel reactor with concentrations close to 1 vol %. The presence of H2S in the fuel gas produced the deactivation of the oxygen carrier in terms of an important decrease in the reactivity and oxygen uncoupling capacity, resulting in a relevant drop in the combustion efficiency, decreasing from full combustion to 72% after 17 h of operation with H2S addition. Moreover, the presence of H2S caused an unstable circulation of solids, because of agglomeration problems. Therefore, in order to use this reactive oxygen carrier with H2S-containing fuels in future CLC industrial plants, it would be necessary to fully desulfurize them due to the high sensitivity to sulfur poisoning of this material. © 2014 American Chemical Society.
Descripción13 pages, 13 figures, 3 tables.--Published January 27, 2014
Versión del editorhttp://dx.doi.org/10.1021/ef4020718
Identificadoresdoi: 10.1021/ef4020718
issn: 0887-0624
e-issn: 1520-5029
Aparece en las colecciones: (ICB) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.