Design And Analytical Study Of The Key Parts On The New High-Efficiency Precision Filter

Vertical high-efficiency precision filter is the latest self-developed large-scale solid-liquid separation equipment. The equipment is used for alumina production. Filter cylinders, the core parts of the device, are made of the multi-layer stainless steel wire. The structure about the device includes eight parts: outer shell, inlet pipe, return pipe, sub-feeder, and filter cylinder, fine filtrate concentrated lines, the lower stirring device and upper tank.According to the structural design about the precision filter, the finished research works are as follows:1. On the basis of the structural characteristics of the radialized distribution of the filter cylinder, it presents a new arithmetic for the first time. And the arithmetic is based on the minimum filtering areas as large as possible. On the premise of assuring the space and the total number of filter cylinders, the algorithm increases the space among filter cylinders to make the filter cylinders desliming easily.2. The centralized piped-fluid field is simulated with the unsteadily numerical method by Fluent software. The result shows that the fluid in the filter cylinders connected with the pipelines extremely unevenly diverges when the fluid is back. After the improvement about the structure, the ratio between the maximal flow velocity and the minimal flow velocity decreases from 38.3 into 1.85, and the goal, which is the fluid being diverged averagely, come true.3. The fluid field about the stirring device is simulated with the steadily numerical method by Fluent software. The results show that the original stirring power formula is not suitable any longer when the exit is designed in the bottom of the stirring flow field. Now the whole flow direction and the flow velocity are the main parameters which affect the stirring power. At the same time, the combination of the positive oar and the negative oar can reduce the stirring power loss.The distribution algorithm is put forward in the paper, which fills the field without the non-algorithm in the radialized distribution. The research about precision filters, the reduction of the frequency about changing the filter cylinder, the improvement of the production capacity and the solution about the matching of the precision filters stirring power.