| Pipeline is one of the five most common means of transport in today’s industry.As a special equipment,pipeline has special advantages in transporting liquid,gas and slurry,especially it plays an irreplaceable role in petroleum,chemical industry and natural gas industry.With the rapid development of China’s economy,the demand for oil and gas is increasing day by day,and the construction scale of oil and gas gathering and transportation pipelines is also increasing.Pipeline corrosion,as a type of pipeline failure,not only seriously affects the efficiency of oil and gas gathering and transportation,but also causes huge economic losses.The erosion and corrosion of solid particles often occur in oil transfer through elbow pipe.This article refer to a lot of about the document of piping erosion at home and abroad,using CFD software for numerical simulation to the standard k-εmodel and DPM model,flow characteristics analysis of the pipe and erosion wear phenomenon,respectively study the Z-shaped tube andπ-shaped tube under different structure and operation parameters of maximum erosion rate,change the two pipe elbow of the radius of curvature,pipe diameter,it is concluded that the pipeline under different conditions of maximum erosion rate(Max_e),draw the maximum erosion rate and the history of these factors,CFD simulation of multiphase flow calculation,analysis of pipeline wall wear and internal flow field distribution,Find out the position where the bend is most prone to wear;The influence of fluid velocity,solid particle diameter,mass flow rate and density on maximum erosion rate was analyzed.The simulation results show that the maximum pressure of Z-shaped tube andπ-shaped tube is distributed on the outer diameter wall of the elbow,and the maximum velocity is distributed on the inner diameter wall of the elbow.The most corrosive erosion occurs at the elbows of Z-shaped andπ-shaped pipes;When the radius of curvature of Z-shaped tube increases,the maximum erosion rate increases.When the radius of curvature ofπ-shaped tube is 1.5D,the maximum erosion rate is the highest.The smaller the diameters of the two tubes are,the greater the maximum erosion rate is.With the increase of fluid velocity and particle mass flow rate,the maximum erosion corrosion rate of the two tubes increases.The maximum erosion corrosion rate decreases with the increase of particle diameter and density. |
