Experimental Studies And Numerical Prediction For The Wear Characteristics Of Typical Tube In Liquid-solid Two Phase Flow System

High speed relative motion between the material surface and the flow of medium can cause erosion wear to the material.Erosion wear general widely exists in the chemical industry,energy,metallurgy,mining and other industries.The multiphase flow medium transport in the process of coal liquefaction has the characteristics such as high concentration of solid phase,high speed and high temperature.Pipeline system and throttling equipment are always generate wall thickness reduce and leakage failure accidents,which seriously affect the normal and safe production of coal liquefaction engineering.The failure mechanism is more complicated,there is no a set of effective prediction and checking method.Therefore,revealing typical tube erosion characteristics and combined with the actual engineering case analysis is vital significance to pipeline risk assessment and the safe operation.In this paper,a homemade rotary liquid solid wear test device was used to carry out the liquid-solid two phase flow on the experimental study of typical pipe erosion wear.The erosion wear mathematical model was established to simulation analysis the black-water angle valve use the finite element analysis method,study on liquid-solid two phase flow prediction methods of erosion wear.The main research contents and conclusions are as follows:The rotary liquid-solid flow erosion wear experiment device is researched by the computer simulation.Through the distribution of phase fraction,velocity,moving direction on the field,the erosion-wear experiment scheme was determined.The erosion wear test of the typical pipe material(316L and 304L)aim at the coal chemical industry was carried out in a homemade rotary liquid-solid two-phase flow erosion test device with different impact angle,erosion velocity and slurry consistence,reveals the erosion mechanism of the typical pipe material(316L and 304L)under the liquid-solid two-phase flow system.The results showed that the erosion mechanism is that the furrows cutting wear is predominant at low angles,and the forging distortion wear is dominant at high impact angles.Black-water valve erosion wear mathematical model is set up.Combined with the finite element simulation calculation of rotary liquid-solid flow experiment device and the results of liquid-solid flow erosion wear experimental,the black-water valve erosion correction model is established.Particle trajectory model is used to predict black-water angle internal: The angle valve port,which is a reducing structure,leads to the increase of velocity in valve core and the wear is very serious.There is a good qualitative agreement between the results of numerical prediction and case anatomy.This innovation of article lies in: 1)Finite element method was carried out on the test device,to explore the change rule of wear rate at the different impact angle,erosion velocity and slurry consistence.2)Using the actual material and working condition of pipeline equipment to carry out wear test.The mathematical model of erosive wear failure of black-water angle valve is established,and the quantitative prediction and evaluation of erosion wear is realized.3)The erosion prediction method which is a combination of numerical prediction,wear experiment and case analysis is reasonable,when the numerical forecasts agree with the case analysis.