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Chemical looping combustion in a 10 kWth prototype using a CuO/Al2O3 oxygen carrier: Effect of operating condition on methane combustion

AutorAdánez Elorza, Juan ; Gayán Sanz, Pilar ; Celaya Romeo, Javier; Diego Poza, Luis F. de ; García Labiano, Francisco ; Abad Secades, Alberto
Palabras claveChemical-looping combustion
Oxygen carrier
Copper oxide
CO2 capture.
Fecha de publicación2006
EditorAmerican Chemical Society
CitaciónIndustrial & Engineering Chemistry Research 45(17) : 6075-80 (2006)
ResumenChemical Looping Combustion (CLC) is nowadays an attractive option to decrease the greenhouse gas emissions affecting global warming, because it is a combustion process with inherent CO2 separation and, therefore, without energy losses. The CLC concept is based on the transfer of oxygen from the combustion air to fuel by means of an oxygen carrier in the form of a metal oxide. The system consists of two separate but interconnected reactors, normally fluidized bed type. In the fuel reactor the oxygen carrier particles react with fuel and generate a gas stream mainly composed by CO2 and H2O. The reduced metal oxide is later transported to the air reactor where oxygen from the air is transferred to the particles, obtaining in this way the original metal oxide ready to be returned to the fuel reactor for a new cycle. In this work, a 10 kW pilot plant composed of two interconnected bubbling fluidized bed reactors has been design and built to demonstrate the CLC technology. The prototype was run during 200 h, of which 120 h burning methane, and the effect of the operating conditions (oxygen carrier to fuel ratio, fuel gas velocity, oxygen carrier particle size and fuel reactor temperature) on fuel conversion was analyzed working with a CuO-Al2O3 oxygen carrier prepared by dry-impregnation. Also, the behavior with respect to attrition, agglomeration, and reactivity of the oxygen carrier was analyzed. It was found that the most important parameter affecting the CH4 conversion was the oxygen carrier to fuel ratio. Complete methane conversion, without CO or H2 emissions, was reached with this oxygen carrier working at 800ºC and oxygen carrier to fuel ratios higher than 1.4.
Descripción5 páginas, 10 figures
Versión del editorhttp://dx.doi.org/10.1021/ie0603641
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