Low-Cost Fe-Based OxygenCarrier Materials for the iG-CLC Process withCoal. 2.

In order to compare potential oxygen carriers for the iG-CLC with coal a methodology was developed from resultsobtainedin a batch fluidized reactor. The methodology is based on the solidsinventory in the fuel reactor. The solids inventory values will beused for comparison purposes among different materials rather thanfor design purposes. In a companion paper, experiments with differenttypes of Fe-based oxygen carriers were presented. Based on these experimentalresults, the present paper proposes two theoretical approaches fora fast evaluation of different materials as potential oxygen carriersfor the iG-CLC process with different fuels. Themethodology is focused on the study of the gasification of the chargenerated in the process after the devolatilization of the correspondingsolid fuel and the subsequent combustion of the gasification products.Considering the results of carbon capture and combustion efficiency,the adequacy of the material can be evaluated. Four different Fe-basedmaterials are tested in this work: ilmenite, bauxite waste, a mineralbased on hematite, and a synthetic material. Based on the resultsobtained, the bauxite waste and the hematite mineral present the bestperformance for iG-CLC. As a rough estimation, aninventory around 1600 kg/MWthwill be needed using anyof the above materials to achieve carbon captures above 0.93 and combustionefficiencies of 0.99 at 1000 °C. [ABSTRACT FROM AUTHOR]