Retrofit Design And Hydraulic Performance Analysis Of BZ Centrifugal Slurry Pump

Slurry pump is one of the industrial pumps widely used in the development of national economy.It is of great significance to optimize and reconstruct its structure and performance.Due to the diversity and complexity of medium,the theoretical research of slurry pump is far behind that of clearwater centrifugal pump.Up to now,there is still no accepted slurry pump design theory and method in the world.With CFD technology in the application and development of hydraulic machinery disciplines increasingly mature,the optimization of slurry pump design more with the pump design theory combined with numerical simula t io n method,this method can greatly shorten the development cycle of the pump,and can reduce the number of pump test,thus reduce research and development and the production cost.Taking BZ slurry pump as the research object,the hydraulic performance of the original model of slurry pump and the internal flow characteristics of each flow component are predicted and analyzed by using the standard k-model turbulence model in ANSYS CFX software.According to the characteristics of the original model,combined with the design experience of slurry pump and reference to the basic theory of clearwater centrifuga l pump,the optimization design scheme of impeller and volute is put forward.For the impeller,two optimization schemes AB are designed.Plan A changes the original impeller diameter,outlet width,inlet and outlet setting Angle,blade thickness and other structura l parameters.In plan B,the impeller diameter and outlet width of the original plan remain unchanged,and only the blade inlet and outlet placement Angle,blade head arc size and blade thickness are modified appropriately.In view of the volute section design,on the basis of maintaining the original design advantages,an innovative design method of "s-shape" profile parameter variation law is proposed.In addition,based on the traditional diffus io n tube,a new type of semi-shrink diffusion tube structure is designed by changing the cross section area of the throat.Finally,the external characteristic curve of slurry pump after optimization is obtained through numerical simulation and analysis,and the internal flow characteristics of impeller and volute before and after improvement are discussed.The results show that the overall performance of slurry pump is better than that of the original scheme,and the performance evaluation indexes have reached the expected goal.The improved impeller not only reduced the impeller head impact loss,but also significa nt ly improved the vortex in the impeller passage.The internal velocity distribution of the volute is more reasonable and the hydraulic loss is reduced according to the variation law of the parameters of the inverted S-shaped profile.The semi-shrinkable diffuser has the same energy conversion effect as the ordinary diffuser,and the increase of the contraction degree of the diffuser can reduce the area of the volute tongue impacted by water flow and reduce the hydraulic loss in the volute.In addition,the research results show that the increase of the shrinkage degree of the diffuser is also conducive to the improvement of the pump "hump" phenomenon.