In view of the problem that gas-solid two-phase flow is not evenly distributed in the elbow of the entrance of flue gas pollutants removal system in the coal-fired power plant

a new two-phase deflector structure was put forward. CFD numerical simulation was employed to analyze the uniform effect of two-phase deflector and conventional deflector. The effect of the two-phase deflector on the distribution law of flow velocity and particle mass

and the effect of the plate shape and the plate angle on the uniform effect of two-phase deflector were simultaneously studied. Finally

the optimum structure of the two-phase deflector was obtained by the Design-Expert response surface method and CFD. The optimal structure was applied to the industrial test and the final result of the calculation and industrial test data were compared. The results showed that it is better to install two-phase deflector than deflector or delta wing baffle in the elbow because of the more uniform distribution and lower pressure drop. The flow velocity distribution and the particle mass concentration distribution changed gradually with the increase of the angle between the plates and the pressure drop of the elbow increased with the angle between the plates too. The optimum structure was the two-phase deflector with the angle of 75.49°and straight plate type. The comparison between the simulation and field measurements showed good agreement. The numerical simulation method proposed by this paper can be used to calculate gas-solid flows in the ESP inlet elbow with complex internal structure in detail.