Research On Ball Valve Erosion Wear Of Natural Gas Transmission Pipeline Based On Finite Element Method

With the development of the petroleum industry,natural gas plays an increasingly important role in the energy field.When the natural gas long-distance pipeline is transporting natural gas,due to the existence of impurities such as particulate dust in the pipeline,the ball valve will be impacted under the action of high-speed air flow,forming groove marks and cracking,which will cause erosion and wear effects on the ball valve.As a result,the ball valve is damaged and ineffective,and the leak tightness weakens the gas leakage,thereby causing a dangerous situation to shorten the service life of the ball valve.In the existing research,there are many studies on the erosion wear of straight pipes and elbows,but few studies on ball valves.Existing theories cannot predict the erosion wear of ball valves.In view of this problem,this article takes a metal fixed ball valve as an example,and uses the finite element method multiphysics coupling calculation software Comsol Multiphysics to conduct a numerical simulation study on the erosion and wear of the ball valve by gas-solid two-phase flow.The main research contents are as follows:Three-dimensional modeling of the ball valve,select the physical control grid sequence type to divide the grid,and use the Euler-Lagrangian description method for the flowing medium.The characteristic change speed,pressure,turbulent kinetic energy and particle movement trajectory in the flow field are simulated to obtain the erosion and wear area of? ? the ball valve.The erosion and wear parts are mainly generated on the flow surface of the valve core,the inner channel wall surface,and the sharp edge wear The degree is more serious.From different structural parameters(opening,inner channel diameter)and different flow parameters(velocity,particle size,particle diameter),its influence on ball valve erosion and wear was analyzed.As a result,it was found that erosion and abrasion will occur in just a few seconds,which is very harmful.Controlling a certain flow rate,valve opening,and reducing particle size can reduce the degree of erosion and abrasion.Considering the erosion and wear of the ball valve under the action of fluid-solid coupling,the stress-deformation displacement of the ball valve on the flow surface is analyzed,and the erosion and wear under the action of fluid-solid coupling is compared with that under the action of non-fluid-solid interaction to reveal The mechanism of erosion and wear under the action of fluid-solid coupling.Finally,the numerical simulation results are compared with the actual erosion and wear of the ball valve on site,the accuracy of the numerical simulation results is verified,and the corresponding protective measures are proposed.The erosion and wear mechanism of the ball valve is relatively complex.The previous experimental method is generally limited by factors such as the environment and working conditions.The research results have large errors and strong limitations,and can only be applied to specific models.Compared with the experiment,the CFD numerical simulation technology can display the microscopic flow characteristics and erosion and wear around the flow field in detail,which saves a lot of time and cost,is efficient and simple,and has a wide range of application.It provides practical safety operations for field projects.In addition to theoretical guidance,it also provides corresponding data support for the optimization of the structure of the ball valve in the future and the increase of the service life of the ball valve,which is of great significance for the efficient use of natural gas energy.