Abstract: A gas pipe distributor is widely used in regenerator of FCCU. However, there are problems of gas maldistribution and nozzle erosion in the pipe distributor. Therefore, the gas flow field in pipe distributor was simulated by using the CFD commercial software. The result shows that the gas velocity in each branch tube is different, depending on the length of the tube. The gas flow rate through each nozzle is also different which leads to a big inhomogeneity of gas distribution. In addition, there exists an obvious deflective flow at the inlet side of nozzle tube and non-uniform of pressure distribution, which may cause low pressure drop of nozzle, leading to catalyst entrainment into banching pipe and erosion.

Key words: FCC, gas pipe distributor, numerical simulation, gas flow field, gas distribution performance