Abstract: In order to investigate the influence of the internal flow field of a large FCC catalyst preparation spray dryer on the performance of the catalyst, a 50-kt /a two-phase flow CFD model was established using the Euler-Lagrange model. The flow field information of the large spray drying tower was obtained through the preliminary simulation of the large spray drying tower and the simulation calculation of the modified model. The velocity field distribution data showed that the gas phase flows faster in the center of the tower, and vortices are generated on the left and right sides, but they were not completely symmetrical. The optimum number of spray guns and spray angle can be obtained from the study of parameter optimization process of spray drying tower.

Key words: spray dryer, catalytic cracking, catalyst, numerical simulation