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5 páginas, 10 figuresChemical Looping Combustion (CLC) is nowadays an attractive option to decrease the\udgreenhouse gas emissions affecting global warming, because it is a combustion process with\udinherent CO2 separation and, therefore, without energy losses. The CLC concept is based on\udthe transfer of oxygen from the combustion air to fuel by means of an oxygen carrier in the\udform of a metal oxide. The system consists of two separate but interconnected reactors,\udnormally fluidized bed type. In the fuel reactor the oxygen carrier particles react with fuel and\udgenerate a gas stream mainly composed by CO2 and H2O. The reduced metal oxide is later\ud\udtransported to the air reactor where oxygen from the air is transferred to the particles,\udobtaining in this way the original metal oxide ready to be returned to the fuel reactor for a\udnew cycle.\udIn this work, a 10 kW pilot plant composed of two interconnected bubbling fluidized bed\udreactors has been design and built to demonstrate the CLC technology. The prototype was run\udduring 200 h, of which 120 h burning methane, and the effect of the operating conditions\ud(oxygen carrier to fuel ratio, fuel gas velocity, oxygen carrier particle size and fuel reactor\udtemperature) on fuel conversion was analyzed working with a CuO-Al2O3 oxygen carrier\udprepared by dry-impregnation. Also, the behavior with respect to attrition, agglomeration, and\udreactivity of the oxygen carrier was analyzed. It was found that the most important parameter\udaffecting the CH4 conversion was the oxygen carrier to fuel ratio. Complete methane\udconversion, without CO or H2 emissions, was reached with this oxygen carrier working at\ud800ºC and oxygen carrier to fuel ratios higher than 1.4.This research was carried out with financial support from the Spanish Ministry of Education\udand Science (Projects PPQ-2001-2111 and CTQ-2004-04034) and from the Diputación\udGeneral de Aragón (Project PIP023/2005).Peer reviewe

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