To analyze abrasion problem in FCC power recovery system,the gas-solid flow in critical nozzles of two constructions i. e. orifice plate and Laval type is coupling calculated by using k-ε model and DPM model in the computational fluid dynamics( CFD) numerical software—Fluent. The results indicate that the positions of abrasion by particles are greatly different in the critical nozzles of two constructions. The abraded area of orifice plate is mainly located in the wall of the main flue gas stack,1 000 ~ 1 5...