Study On Dynamics Of Cold Precipitation Circulation Pump In Alkali Industry

In our country,the cold precipitation circulation pump is one of the core facilities in the process of cry stallization for alkali production. At present, in the process for alkali production axial flow pumps are commonly used in our country. The Axial flow pumps have the characteristic of small flux, low lift, poor corrosion resistance and poor maintenance environment, which bring many difficulties to the production. So mixed flow pump was used to replace the axial flow pump to resolve these issues through the optimization of materials and structure.This paper describes the basic theory and methods of numerical simulation about internal flow of mixed-flow pump, elaborate leaf shape, mesh generation, boundary conditions, wall conditions, practical skills and Setting method in detail by CFD. In addition, it also explain the process and methods of the internal flow and the external characteristic prediction method based on numerical simulation of external flow.Analyzed the numerical simulation of internal flow in design conditions. The paper shows the structure of the over-current components in flow field , analysis the change-flow field and the outer curve from small to large flow fluid. Compared numerical simulation date and model test data,and the results match better.All of this verify the reasonableness of the numerical simulation.The detailed data of mixed-flow pump was obtained by CFD.It clearly shows the pump body, the pressure and velocity distribution of the impeller blades and other parts.Various characteristics of the mixed-flow pump can be clearly seen by FLUENT post-processing, and these characteristics provide theoretical reference for the mixed-flow pump optimal design.