(696a) Computer Simulation of a Full Chemical Looping Combustion System

A full three-dimensional model of a chemical looping combustion (CLC) system using coal as a fuel source has been created.  The relevant chemical reactions and thermal effects are modeled inside the full CLC loop, which consists of an air reactor, fuel reactor, riser, and cyclone.  The particle-fluid dynamics within the full loop have been modeled with an Eulerian-Lagrangian approach which allows the disparate fluidization regimes inside the CLC loop to be modeled simultaneously.  Multiple heterogeneous and homogenous reactions are considered at the particle level including the oxidation-reduction reactions of the ilmenite carrier and gasification of the coal-based carbon.  Additionally, the temperature-dependent release of volatile components is modeled in each coal particle.  The model is fully thermal and the effects of reaction energy and water vaporization are coupled to the particle-fluid dynamics and reaction chemistry.   Results detailing the fluidization and transport behavior, temperature profiles, and reaction conversion in the CLC loop are presented.