A transient one-dimensional model is developed for simulation of the chemical looping reforming process in a circulating fluidized bed (CFB). A CFB reactor model consisting of two connected bubbling bed units, namely the fuel reactor (FR) and the air reactor (AR), is proposed, and the simulated results are validated by comparison with experimental data available in the literature. Three cases with different oxygen-carrier-to-fuel ratios are simulated until the equilibrium concentrations are established in the solid phase. The hydrogen conversion and oxygen carrier conversion results from the simulations are then compared with experimental data from the literature, showing that the numerical results are in fair agreement with the experimental results. Model validation against experimental data of the process performance is of paramount importance for future process design and optimization of chemical looping systems via numerical modeling and simulation.