Abstract: Submicron particles are one of the important sources of air pollutants,which are harmful to human health. Turbulence agglomeration is a promising technology to remove submicron particles from coal-fired flue gas. Based on the k-ε turbulence model and the discrete phase model( DPM),a numerical model of the agglomeration process of submicron particles that is affected by the turbulence effect and Brownian motion was established on the basis of the experimental platform of submicron particles turbulence agglomeration. The model was verified by the experimental data. The influences of the inlet velocity,the arrangement and the shape of the vortex generators on the agglomeration characteristics of particles were studied. The results show that the main areas of collision and aggregation are the windward side of the generator and the longitudinal wake area of the generator. The agglomeration efficiency of small particle size is significantly higher than that of large particle size,and the agglomeration efficiency is negative at 593.5 nm particle size. At different flow rates,the agglomeration efficiency of PM_(0.1) is higher than that of PM_1 due to the stronger following ability of smaller particle size in the vortex.The inlet velocity of the device should not be too large to ensure the required residence time of particles. The maximum agglomeration efficiency of the tripod staggered generator used in the simulation is observed when the velocity is 5 m/s. The agglomeration efficiency of submicron particles in the sequential and staggered structures is not different,but the interaction mechanism of the sequential and staggered structures on submicron particles is quite different. The vortex street in the wake area of the sequential structure spoiler has been fully developed. The staggered structure contains more windward faces,which increases the probability of particle collision,but it is more vulnerable to particle erosion. In addition,under the condition of a single generator,due to the stronger vortex generation capacity of Y-shaped spoiler,it has better turbulent agglomeration effect than the cylindrical and triangular generator.