The Friction And Wear Mechanism Of Centrifugal Slurry Pump And Finite Element Analysis

Centrifugal slurry pumps are broadly applied in modern industry. The centrifugal slurrypumps discussed in this paper mainly refer to those that transfer media with a two-phase mixedfluid containing solids and liquid. Since the pumped media often contains acid or basic mediaas well as hard particles, the wet end parts of such a pump in the process are severely affectedby the acid or basic media, while the hard particles impose an erosion effect on them. The worstworn part among the wet ends is the impeller.This paper is mostly based on the writer’s working experiences on slurry pumps in JiangxiNaipu Company and in Dashan Concentrator of Dexing Copper under Jiangxi Copper Company,where the writer conducted research and analysis on the friction and wear as well asmalfunction of pumps in operations. In the beginning,I researched the centrifugal slurry pumpoperating principles and features of key structural components are described. Sequentially, incombination of abrasion mechanism in a slurry pump, a systemic study and research is carriedout on the wear effect and its regulation on pumps through slurry nature, particle sizing,competence, shape and density, specific speed, motion trace of solids in a flowing course,operating duty, and impeller material. It is pointed out in the study that, when it was pumped, atwo-phase fluid with smaller particles and lower density makes wear more on the outlet ofvanes while that with larger particles and higher density sees more wear on the inlet of vanes.On this basis,I also described the commonly used wear-resistant material of slurry pump partsand material selection principles for the slurry pump components.which provides the basis forselection of materials.At the end, a finite element model of impeller is established before the FEA is conductedon a slurry pump in this paper to determine the impeller’s stress, extension of stressdeformation and the distribution. Finite element strength analysis is also carried out on anempty-run impeller and one in operation, declaring that, under operating condition, the maximalstress occurs in the joint between the impeller hub and the body, thus offering a theoretical basisfor the design of impeller.