Circulating fluidized bed simulation for chemical looping combustion process by using Aspen Plus

Because of the global warming, techniques that can trap the releasing of carbon dioxide from the combustion of fossil fuel into the atmosphere have been receiving attention. Chemical looping combustion (CLC) is a technique for reducing carbon dioxide. It consists of two main processes: in the fuel reactor, the coming fuel reacts with solid metal oxide particles to produce CO2 and H2O vapor which later can be easily separated using condensation. The reduced solid metal sends to the air reactor for regenerating via an oxidation reaction with air before returned them to the fuel reactor. In this study, a model of a circulating fluidized bed for chemical looping combustion process has been developed in Aspen Plus. The fuel reactor (or downer) operates in bubbling regime where the air reactor (or riser) operates in fast fluidization regime. The novelty of this study is that the developed model of CLC was connecting the two fluidized beds which were operated at different hydrodynamics regimes and kinetics. The results give more insight for operating the CLC.