The simulation of methanation process is studied by CFD

and makes reasonable improvement to the model. The three-dimensional model of methanation reaction on the plum-shaped catalyst was established and the validity of the model was verified. Due to strong diffusion limitations the CO concentration of catalyst particles has great difference between the internal and external. Inside the catalyst

reaction conditions are changed to be a high H/C value. The diffusion rate of H2 is larger than CO. A single kinetics can't describe the reaction accurately. The catalyst domain is divided into two parts according to the variety of CO concentration in catalyst

and different kinetics is applied into the corresponding domain. Under the control of two kinetics

the average reaction rate of methanation has been accelerated

which is closer to the actual process and show that the new model is more accurate.