| In fact,the strip is heated by Joule heat generated by the eddy current which is produced by magnetic flux that is caused by alternating current of the coil of the heater in the transverse flux induction heating process.Compared with the traditional longitudinal flux induction heating equipment,the way that heats trip or sheet by transverse magnetic field has some advantages such as fast heating speed,high heating efficiency,the use of electric heating power frequency is low,but there is also a problem that the temperature distribution is uneven.This problem seriously restricts the application of transverse flux induction heating technology in practical engineering.In this paper,the coupling analysis of the eddy current field and the temperature field of the transverse flux induction heating device is carried out so that the strip can obtain a more uniform temperature distribution at the outlet of the heater.Firstly,the mathematical model of the eddy current field and temperature field is established,and then a simulation model is established by using the finite element analysis software.Considering the parameters of strip material,such as conductivity,permeability,thermal conductivity,and specific heat capacity change non-linearly with temperature,a new transverse flux induction heating simulation method is designed in this paper.The temperature distribution of the traditional rectangular coil under the condition of considering the change of strip's material parameters and without considering the change of strip's material parameters is analyzed.The coil of the heater is designed according to the projection law of the eddy current distribution on the surface of the strip heated by transverse flux induction.Comparative analysis of rectangular,circular and hexagonal double diamond,four kinds of induction heating device with different coil structure of the heating effect,according to the analysis of the distributions of eddy current and temperature on the strip surface,we conclude that the temperature distribution of strip surface at the outlet of the heater of double hexagonal coil structure are more uniform.And we make some simulation experiments with the double hexagonal coil structure as an example.The influence of the speed of movement,the magnitude of current,the frequency of current on the strip temperature distribution at the outlet of the transverse flux induction heater is studied,and the relevant conclusions ofpractical engineering application are obtained.Finally,the factors that affects the surface temperature distribution at the outlet of the transverse flux induction heater are further refined and a large number of simulation experiments are carried out.According to surface fitting by MATLAB,we establish the function relationship between the relative uniformity of the strip temperature distribution of transverse flux induction heater outlet and the size of current,the frequency of current and the velocity of the strip,that is used to design the new induction heater. |
PDF Full Text Request