The 3d Numerical Simulation Study On Solid-liquid Hydrocyclone In Flue Gas Desulfurization System

Hydrocyclone is an equipment that separates heterogeneous mixture, which is used in the limestone-gypsum WFGD to concentrate gypsum slurry and size grading in thermal power plants. To solve the current problem such as the deviation is large between actual and design data, gypsum slurry is blocked easily and the hydrocyclone is wear seriously on hydrocyclone in power plant application of gypsum, and to accelerate the localization process of the gypsum hydrocyclone, it is of enormously significance to research separation properties of the hydrocyclone.In this paper, numerical simulation was used to study the internal flow fields based on the Reynolds stress model and mixture model with commercial software Fluent.Firstly, hydrocyclone internal flow field of the velocity distribution and pressure distribution of internal flow field is got by the single-phase flow numerical simulation.Secondly, the numerical simulation is conducted for solid-liquid two-phase flow. The distribution of two-phase flow field and the relationship between the flow separation efficiency with different thickness of vortex finder, different length of vortex finder stretch into hydrocyclone and the diameter ratio of vortex finder and apex were gained. In order to verify the accuracy of simulated results of gypsum hydrocyclone, the experiments have been for hydrocyclone. Results show that the experimental results of relationship between pressure-separation efficiency are consistent with its simulation results, the average error is less than 5%. This contrast results illustrate that the selected model and algorithm is feasible.At last, The entry and column structure of hydrocyclone were optimized. The results show that: compare to the two structure of helical entrance and tangential entrance, the tangential velocity is increased significantly, and the separation property is improved; Compared to the original structure, the ball cylinder structure of hydrocyclone has a more stable flow field and short-circuit flow is weakened.