输送管道中频感应加热的磁-热耦合仿真

Simulation of coupling of electromagnetic and thermal of intermediate frequency induction heating of pipeline

通过建立二维轴对称数学模型,对实际工况下厚壁管道中频感应加热过程的磁-热耦合进行了数值仿真。分析了管道内部电磁场、涡流场与温度场的分布情况,研究了电流频率、输入电流以及线圈与管道之间的空气间隙等主要参数对管道加热效率的影响规律。结果表明,磁通密度和感应电流密度在同一路径上的分布规律相似,管道两端的磁通密度分布和电流密度分布存在很大的不均匀性。与实际试验结果相对比,所建立的模型及模拟方法合理可行。可以通过提高电流频率,增加输入电流密度,适当减小线圈与管道的空气间隙来提高管道感应加热的效率。

Based on an established 2D axisymmetric mathematical model,the electromagnetic-thermal coupling of medium frequency induction heating process of thick wall pipe was carried out with numerical simulation under actual conditions. Specifically,the distributions of electromagnetic,eddy current and temperature fields within pipeline were analyzed,and effects of the main parameters such as current frequency,input current and the air gap between coil and pipeline on heating efficiency were investigated. The calculated results show that magnetic flux density has the similar distribution rules with induced current intensity on the same path. Additionally,distributions of magnetic flux density and induced current intensity on both ends of the pipes are greatly uneven. Compared to actual experimental results,the established model and simulation method are accurate and feasible,indicating that the induction heating efficiency can be improved by increasing current frequency and input current density,and moderately decreasing the air gap between coil and pipeline.