Examination of chemical-looping combustion of gaseous fuels by 1-dimensional modeling and experiments

Paper in proceeding, 2014

This work presents a 1-dimensional model for the fuel reactor in chemical looping combustion (CLC) with gaseous fuels. Modeled fuel conversion is in good agreement with experimental data from a 300W CLC unit using syngas as fuel and ilmenite as oxygen carrier. The sub-model for the solids fluid dynamics is based on semi-empirical expressions derived and typically used in regular fluidized bed air combustion. These expressions have here been experimentally validated for conditions relevant to chemical looping combustion with data from a 100 kW CLC unit and a cold flow model of the same unit. Fuel conversion is modeled accounting for both heterogeneous and homogeneous kinetics and assuming a classical twophase flow approach for which the influence of the correlation chosen for the gas interchange coefficient is found to have a slight influence the results.