Structure Optimization Of Vortex Flow Drainage Tool For Wet Gas Pipeline With Undulating Terrain

When the wet gas pipeline is in operation,it will encounter the working conditions of undulating terrain.Some water and condensate contained in the moisture in the pipeline will remain and accumulate here,which will not only cause corrosion and blockage of the pipeline,but also affect the natural gas Transmission power and transmission efficiency.The vortex tool is a new type of method used to drain liquid and recover gas in recent years.The Kelamei gas field was put into production to remove the liquid accumulation in the pipeline,the Changqing gas field was used for auxiliary drainage in the pipeline,and some desilters were also used in the cyclone.The principle of fluid drainage and so on.Therefore,it is particularly necessary to study the influence of eddy current tools on liquid carrying in pipelines and optimize the best structural parameters of eddy current tools.This paper adopts a combination of theoretical analysis and numerical simulation to compare and discuss the theoretical basis of the droplet model and the liquid film model.The force analysis of the inclined tube and the horizontal tube in the vortex flow field is carried out;various kinds of simulations are performed before the simulation.The multiphase flow model,turbulence model,coupling method and discrete method are compared and selected,and the optimal combination of simulation methods under the vortex flow discharge condition is obtained;3D modeling of the vortex tool that has been put into use is carried out,and the mesh is divided Import into FLUENT to simulate and analyze the flow field,and obtain the influence of the structure parameters of the vortex tool on the thickness of the liquid film of the annular flow,as well as the relationship between the thickness of the liquid film and the effective length of the vortex flow discharge;finally,through the rotation strength and the outlet Two indicators of cross-section liquid holdup are judged.Orthogonal experiments and structural optimization of eddy current tools are carried out.The research results show that the vortex tool can carry out a part of the accumulated liquid in the pipeline,which can not only change the flow pattern of the gas-liquid two-phase flow and make the two-phase laminar flow transition to the annular flow,but also reduce the internal pressure of the pipeline and increase the fluid flow.Speed,take the liquid away;for the vortex flow discharge simulation simulation,the model combination of MIXTURE,RSM,and QUICK is more conducive to the convergence and accuracy of the simulation;based on the establishment of the model,the sensitivity factors affecting the thickness of the annular flow liquid film are analyzed It is concluded that when a complete annular flow liquid film is formed,the thickness of the liquid film is thicker,the water volume fraction of the pipe wall is higher,and the effective length of action in the pipe behind the vortex tool is longer.On the basis of the above research content,the orthogonal experiment was designed,and the optimal structure combination with the number of spiral turns of 1.5,the diameter of the center body of 51 mm,and the shape of the blade section rectangular was judged by referring to the test indicators,and it was verified that the optimal eddy current tool performed well.The research results of the thesis reveal the assisted drainage mechanism of the vortex drainage of wet gas pipelines with undulating terrain,which provides technical support and theoretical basis for the design of the vortex drainage technology in the future.