Modeling and scale analysis of gaseous fuel reactors in chemical looping combustion systems

摘要: This work investigates the up-scaling to commercial scale of chemical looping combustion (CLC); a next-generation technology for carbon capture and storage. Focus lies on bottom bed, which is considered be critical region in due its large solids inventory combined with relatively inefficient gas-solids contact. Two CLC reactors vastly different size (bench utility scale) are studied order discern difference effects related up-scaling. A 1-dimensional model used simulate units studied. The considers kinetics dependent degree oxidation oxygen carrier population distribution carriers, whose mixing accounts both convective dispersive transport. validated against bench data applied evaluate performance 1000 MWth fuel reactor using either syngas or methane as fuel. Using model, sensitivity analyses carried out depict effect conversion several parameters such circulation, reactivity, bed height maximum bubble allowed. It shown that mass transfer gas from bubbles emulsion phase represents strongly limiting factor reactors.