Based on the EulerianEulerian bifluid model and the kinetic model of the gassolid heterogeneous chemical reactions,by adding the UDF (user defined function) code into Fluent 6.3 flow solver to integrate the chemical reaction mechanism and heat source term,the gassolid flow processes and chemical reactions of the chemical looping combustion in the fuel reactor—the spouted fluidized bed were modeled.The influences of methane gas inlet velocities on gassolid flow feature,heat transfer and chemical reaction rates were analyzed.With an increasing methane inlet velocity,the gas and solids are found to be mixed more intensely and the uneven distribution of gassolid,lower quality of fluidization,and nonuniform chemical reaction rates and temperature will take place due to the formation,collision and burst of the bubbles.It is also found that there are some spots of higher temperature in local regions,which may lead to particles agglomeration and lower efficiencies of methane combustion.