Inductor Design And Parameter Optimization For Electromagnetic Heating Pullout Large Tee Pipe Process

Large tee pipe fittings form an important part of the long-distance oil and gas transmission pipe network.Its comprehensive performance has a direct impact on the safety and reliability of oil and gas transmission.Before the drawing of the large tee branch pipe,the opening of the main wall must be heated.The traditional heating method uses acetylene-oxygen flame heating,and this heating method has many drawbacks.Therefore,we must look for a better overall heating means.Electromagnetic induction heating technology is one of the most commonly used heating technologies.It has a series of advantages such as fast heating speed,high thermal efficiency,controllable temperature,and low environmental pollution.It is used in many processing fields,but it is used in the early processing of large three-way pipe fittings.Practical applications in the process are still rare.Therefore,based on the theory of electromagnetic induction and heat conduction,this paper first analyzes the relationship between the current distribution in the wall thickness direction of the tube and the frequency of the power supply,the influence of heat dissipation coefficient and power parameters,and the composition of energy loss.The differential equations and corresponding boundary conditions of the eddy current region,air region,and source current region around the opening of the pipeline are studied.The finite element solution method of the nonlinear electromagnetic differential equation is analyzed.The temperature field of the heating region is analyzed based on the heat transfer theory.Differential equations and boundary conditions,and discuss methods for solving differential equations for three-dimensional nonlinear temperature fields.For the commonly used materials in the project,the X65 grade pipeline steel and the main pipe with 580 mm diameter and 20 mm thickness are designed to fit the sensor coil model.Then the coupled model of electromagnetic field and temperature field is established and analyzed by the finite element simulation software ANSYS.The influence of three parameters of power supply frequency,current and heating time on the temperature distribution of the pipe was studied respectively,and the optimal parameter range applicable to the induction heating drawing process of the large tee pipe fitting was obtained.Selecting the optimal heating parameter combination obtained by theoretical analysis,the electromagnetic induction heating experiment was performed on the opening of the side wall of the pipe fitting to verify the reliability of theoretical research results.