The Flow Field Simulation And Control Research Of Hydrocyclone

The strong swirl turbulent flow in hydrocyclone caused major difficulties in modeling their internal solid-liquid flows. In this thesis, the strongly swirling turbulent flow in solid-liquid hydrocyclone separators is simulated using RNG k-ε models and Reynolds stress equation models (RSM) of FLUENT applications to use the body-fitted and partition meshes. It is demonstrated via comparison between the simulation results with experimental data that the RSM model is superior to the RNG k-ε models. It correctly predicts the Ranking vortex of tangential velocity and the anisotropic behavior of the Reynolds stresses. Certain discrepancy remains between the simulation results and the experiment results, not only caused by the turbulent model, but also by the simplification of the inlet boundary condition and the mesh generation. Modeling solid-liquid interaction flows is complex. Liquid phase transport equations coupled with the solid particles interaction are derived based on the RSM turbulent models to handle the interaction of momentum and kinetic energy of turbulence between the liquid and solid particles,in this thesis DPM models and stochastic trajectory models are adopted, and join the source of particles influence at the base of turbulence models, summarize the movement track and separation efficiency while different diameter particles in different displacement enter the hydrocyclone.According to the numerical simulation results, the lab experiment and industrial experiment are implemented in this thesis. The relation of the inlet pressure and flux is analyzed in the lab experiment, and then the relation curve of production capacity-inlet pressure and separating property-inlet pressure is also protracted. The lab experiment has great value to confirm the advisable technology parameter, solve classification technique and its design, study theory and develop new type of hydrocyclone; On the foundation of the lab experiment and numerical calculative results, in the 1-1# system in the second department of the Qidashan milling factory, to use the hydrocyclone to substitute for the spiral classifier and to adopt the dispersive control, the results indicate the feasibility of the control projects, at the same time some new improved problems are put forward in this thesis, adopt the fieldbus and PLC,and perfect the control system, the...