Investigation of a Coupled Fuel Reactor for Coal-Fueled Chemical Looping Combustion

This work presents an experimental investigation and modeling study of a fueld reactor. designed for in situ gasification chemical looping combustion (iG-CLC). The fuel reactor is designed to couple a bubbling, fluidized-bed reactor and a downer ractor; The downer reactor can enhance gas bypassing between the annular fluidized bed and the riser were studied. Experiments in a hot downer reactor were performed; and a two-dimensional model was developed and validated with experimental data. The verified model shows that a downer reactor with proper solids dispersion can eliminate more than 78 % of the fuel gas exiting the fuel reactor with an overall solids dropping rate of 8 kg/m(2).s.